/// <summary>/// CodeFirst/// </summary>public static void CodeFirstShow(){ConnectionConfig connectionConfig = new ConnectionConfig(){ConnectionString = "Data Source=PC-202406030027;Initial Catalog=ZhaoxiSqlSugarDb_Info;Integrated Security=True",IsAutoCloseConnection = true,DbType = DbType.SqlServer};using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//如果不存在创建数据库存在不会重复创建 {db.DbMaintenance.CreateDatabase(); // 注意 ：Oracle和个别国产库需不支持该方法，需要手动建库  }//创建表根据实体类CodeFirstTable1     {db.CodeFirst.InitTables(typeof(CodeFirstTable1));//这样一个表就能成功创建了}//创建单个表 {db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(CodeFirstTable1));//这样一个表就能成功创建了}//手动建多个表 {db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(CodeFirstTable1), typeof(CodeFirstTable2));}//批量创建表//语法1：{Type[] types = Assembly.LoadFrom("Zhaoxi.SqlSugar.Models.dll")//如果 .dll报错，可以换成 xxx.exe 有些生成的是exe .GetTypes().Where(it => it.FullName.Contains("CodeFirst"))//命名空间过滤，当然你也可以写其他条件过滤.ToArray();//断点调试一下是不是需要的Type，不是需要的在进行过滤 //判断如果数据库存在这个表，就删除表foreach (Type type in types){if (db.DbMaintenance.IsAnyTable(type.Name, false)){db.DbMaintenance.DropTable(type.Name);}} //然后创建db.CodeFirst.SetStringDefaultLength(200).InitTables(types);//根据types创建表}//语法2：                {Type[] types = typeof(CodeFirstTable1).Assembly.GetTypes().Where(it => it.FullName.Contains("CodeFirst"))//命名空间过滤，当然你也可以写其他条件过滤.ToArray();//判断如果数据库存在这个表，就删除表foreach (Type type in types){if (db.DbMaintenance.IsAnyTable(type.Name, false)){db.DbMaintenance.DropTable(type.Name);}}db.CodeFirst.SetStringDefaultLength(200).InitTables(types);//根据types创建表}//动态设置表名{db.CodeFirst.As<UnituLong>("UnituLong0011").InitTables<UnituLong>();}}}

//创建表根据实体类CodeFirstTable1   

//创建单个表 
{
    db.CodeFirst.SetStringDefaultLength(200).InitTables(typeof(CodeFirstTable1));//这样一个表就能成功创建了
}

//批量创建表

//命名空间过滤，当然你也可以写其他条件过滤

//动态设置表名
{
    db.CodeFirst.As<UnituLong>("UnituLong0011").InitTables<UnituLong>();
}

2.4、索引支持

  /// <summary>/// CodeFirst创建索引/// </summary>public static void CodeFirstIndexShow(){ConnectionConfig connectionConfig = new ConnectionConfig(){ConnectionString = "Data Source=PC-202406030027;Initial Catalog=ZhaoxiSqlSugarDb_NewInfo;Integrated Security=True",IsAutoCloseConnection = true,DbType = DbType.SqlServer};using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//创建表根据实体类CodeFirstTable3     {db.CodeFirst.InitTables(typeof(CodeFirstTable3));//这样一个表就能成功创建了}}}

 [SugarIndex("index_codetable3_name", nameof(CodeFirstTable3.Name), OrderByType.Asc)] //普通索引--非聚集索引[SugarIndex("unique_codetable3_CreateTime", nameof(CodeFirstTable3.CreateTime), OrderByType.Desc, true)] //唯一索引 (true表示唯一索引) [SugarIndex("index_codetable3_nameid", nameof(CodeFirstTable3.Name), OrderByType.Asc, nameof(CodeFirstTable1.Id), OrderByType.Desc)]   //复合普通索引[SugarIndex("{db}index_codetable3_name", nameof(CodeFirstTable3.Description), OrderByType.Asc)]  //使用 {db}  进行占位符替换，小写不要有空格[SugarIndex("index_{table}_name", nameof(CodeFirstTable3.DescriptionNew), OrderByType.Asc)] //表名占位符（自动分表不需要加这个自动的）[SugarIndex("IndexUnituadfasf3_longx{include:name,id}", nameof(IndexUnituadfasf), OrderByType.Asc)][SugarTable("CodeFirstTable3", TableDescription = "表备注")]//表添加备注public class CodeFirstTable3{[SugarColumn(IsIdentity = true, IsPrimaryKey = true)]public int Id { get; set; }public string? Name { get; set; }[SugarColumn(ColumnDataType = "Nvarchar(255)")]//custompublic string? Text { get; set; }[SugarColumn(IsNullable = true)]public DateTime CreateTime { get; set; }[SugarColumn(ColumnDataType = "Nvarchar(255)")]//custompublic string? Description { get; set; }[SugarColumn(ColumnDataType = "Nvarchar(255)")]//custompublic string? DescriptionNew { get; set; }[SugarColumn(ColumnDataType = "Nvarchar(255)")]//custompublic string? IndexUnituadfasf { get; set; }}

/// <summary>/// 修改数据/// </summary>public static void UpdateData(){//如何输出Sql语句 ConnectionConfig connectionConfig = new ConnectionConfig(){ConnectionString = CustomConnectionConfig.ConnectionString001,IsAutoCloseConnection = true,DbType = DbType.SqlServer};using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//初始化一条数据测试使用db.Insertable<Student>(new Student(){CreateTime = DateTime.Now,Name = "测试数据",SchoolId = 1,}).ExecuteCommand();{  //输出Sql语句db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};}Student student = db.Queryable<Student>().First();//单条更新{student.CreateTime = DateTime.Now;db.Updateable<Student>(student).ExecuteCommand(); //右标题1 下面的所有菜单}//按需更新{db.Tracking(student);//创建跟踪student.Name = "a1" + Guid.NewGuid();//只改修改了name那么只会更新name//跟踪批量操作不会生效，原因：默认最佳性能（跟踪批量性能差，自已循环）//可以清空跟踪db.TempItems = null;db.Updateable(student).ExecuteCommand();}//批量修改{//List<Student> list = db.Queryable<Student>().Take(20).ToList();//foreach (var item in list)//{//    item.Name = "New Name" + DateTime.Now;//}//db.Updateable(list).ExecuteCommand();批量更新中，按需是不能操作的//foreach (var item in list)//{//    item.Name = "New Name 02" + DateTime.Now;//}//db.Tracking(list);//创建跟踪//db.Updateable(list).ExecuteCommand();}//大数据量操作{//db.Deleteable<Student>().ExecuteCommand();//删除所有数据//List<Student> addlist = new List<Student>();//for (int i = 0; i < 1000000; i++)//{//    addlist.Add(new Student()//    {//        CreateTime = DateTime.Now,//        Name = "Richard" + i,//        SchoolId = i//    });//}//初始化1000000条数据到数据库//db.Fastest<Student>().BulkCopy(addlist);大数据批量更新  适合列多数据多的更新 (MySql连接字符串要加AllowLoadLocalInfile=true )普通方式操作//{//    foreach (var item in addlist)//    {//        item.Name = $"批量修改第一次-Updateable方式";//    }//    Console.WriteLine("普通方式批量修改1000000条数据开始计时~~");//    Stopwatch stopwatch = new Stopwatch();//    stopwatch.Start();//    db.Updateable<Student>(addlist).ExecuteCommand();//    stopwatch.Stop();//    Console.WriteLine($"批量修改1000000条数据共：{stopwatch.ElapsedMilliseconds} ms");//}大数据量BulkUpdate操作--高性能//{//    foreach (var item in addlist)//    {//        item.Name = $"批量修改第二次=BulkUpdate方式";//    }//    Console.WriteLine("大数据量操作-BulkUpdate方式批量修改1000000条数据开始计时~~");//    Stopwatch stopwatch = new Stopwatch();//    stopwatch.Start();//    db.Fastest<Student>().BulkUpdate(addlist);//    stopwatch.Stop();//    Console.WriteLine($"批量修改1000000条数据共：{stopwatch.ElapsedMilliseconds} ms");//}}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//忽略某一列不更新 {Student studentUp = db.Queryable<Student>().First();studentUp.SchoolId = 234;studentUp.Name = "忽略某一列不更新";studentUp.CreateTime = DateTime.Now.AddYears(5);var result = db.Updateable(studentUp).IgnoreColumns(it => new{it.CreateTime}).ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//只更新某列--按需更新{Student studentUp = db.Queryable<Student>().First();studentUp.SchoolId = 345;studentUp.Name = "只更新某列";studentUp.CreateTime = DateTime.Now.AddYears(6);var result = db.Updateable(studentUp).UpdateColumns(it => new { it.Name, it.CreateTime }).ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//NULL列不更新 {Student studentUp = db.Queryable<Student>().First();studentUp.SchoolId = 456;studentUp.Name = null;//更新忽略null字段var result = db.Updateable(studentUp).IgnoreColumns(ignoreAllNullColumns: true).ExecuteCommand();//更新忽略null并且忽略默认值 (比如int默认值是0就不更新)var result1 = db.Updateable(studentUp).IgnoreColumns(ignoreAllNullColumns: true, ignoreAllDefaultValue: true).ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//无主键/指定列{//WhereColumns(it=>new { it.Id,it.Name}) //条件列不会被更新，只会作为条件 Student studentUp = db.Queryable<Student>().First();studentUp.SchoolId = 567;studentUp.Name = null;var result = db.Updateable(studentUp).WhereColumns(it => new{it.Id}).ExecuteCommand();//更新单 条根据IDvar result1 = db.Updateable(studentUp).WhereColumns(it => new{it.Id}).ExecuteCommand();//更新集合根据ID by id}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//条件更新{//如果是集合操作请更新到5.0.4版本之前版本禁止使用, 并且只有部分库支持Student studentUp = db.Queryable<Student>().First();studentUp.Name = "条件更新";var result = db.Updateable(studentUp).Where(it => it.Id == 7003783).ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//重新赋值更新{Student studentUp = db.Queryable<Student>().First();studentUp.SchoolId = 678;studentUp.Name = "重新赋值";// studentUp.Name值的基础上在处理var result = db.Updateable(studentUp).ReSetValue(it =>{it.Name = it.Name + "a";}).ExecuteCommand();//多个字段          var result1 = db.Updateable(studentUp).ReSetValue(it =>{it.Name = it.Name + "a";it.CreateTime = DateTime.Now;}).ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//表达式更新{var result = db.Updateable<Student>().SetColumns(it => new Student(){Name = "a",CreateTime = DateTime.Now}).Where(c => c.Id == 7003783).ExecuteCommand();//正确没参数我们称为表达式更新  }}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//批量更新 In{var ids = db.Queryable<Student>().Select(c => c.Id).Take(5).ToList();var result = db.Updateable<Student>().SetColumns(it => it.Name == "a").Where(it => ids.Contains(it.Id)).ExecuteCommand();// in (1,2,3)}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//表达式无实体更新{var result = db.Updateable<DbTableInfo>().AS("dbstudent").SetColumns("StudentName", "表达式无实体更新").Where("id=7003782").ExecuteCommand();}}using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){//根据字典更新{//字典Dictionary<string, object> dt = new Dictionary<string, object>();dt.Add("id", 7003782);dt.Add("StudentName", "字典更新");dt.Add("createTime", DateTime.Now);var tResult = db.Updateable(dt).AS("dbstudent").WhereColumns("id").ExecuteCommand();//字典集合var dtList = new List<Dictionary<string, object>>();dtList.Add(dt);var t666 = db.Updateable(dtList).AS("dbstudent").WhereColumns("id").ExecuteCommand();}}}

ConnectionConfig connectionConfig = new ConnectionConfig()
{ConnectionString = CustomConnectionConfig.ConnectionString001,IsAutoCloseConnection = true,DbType = DbType.SqlServer
};
using (SqlSugarClient db = new SqlSugarClient(connectionConfig))
{db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};List<StudentInfo> addlist = new List<StudentInfo>();for (int i = 0; i < 500; i++){addlist.Add(new StudentInfo(){Id = i + 1,CreateTime = DateTime.Now,Isdeleted = false,Name = $"名称_{i + 1}",SchoolId = i + 1,});}db.Deleteable<StudentInfo>().ExecuteCommand();db.Insertable<StudentInfo>(addlist).ExecuteCommand();//查询集合-//select * from StudentInfoList<StudentInfo> list = db.Queryable<StudentInfo>().ToList();//查询总数int count = db.Queryable<StudentInfo>().Count();//select count(1) from StudentInfoList<StudentInfo> studentList;//按条件查询{studentList = db.Queryable<StudentInfo>().Where(it => it.Id == 1).ToList();//select * from StudentInfo where id=1studentList = db.Queryable<StudentInfo>().Where(it => it.Name != null).ToList();//不是null//select * from StudentInfo where name is not nullstudentList = db.Queryable<StudentInfo>().Where(it => it.Name == null).ToList();//是null                                                                    //select * from StudentInfo where name is nullstudentList = db.Queryable<StudentInfo>().Where(it => it.Name != "名称_11").ToList();//不是空 ,不为空      //select * from StudentInfo where name <> ''}//多条件查询 {studentList = db.Queryable<StudentInfo>().Where(it => it.Id > 10 && it.Name == "名称_11").ToList();//select * from StudentInfo where id>10 and name='a'studentList = db.Queryable<StudentInfo>().Where(it => it.Id > 10).Where(it => it.Name == "名称_11").ToList();}//动态OR查询{Expressionable<StudentInfo> exp = Expressionable.Create<StudentInfo>();string name = "名称_11";//.OrIf 是条件成立才会拼接ORexp.OrIF(!string.IsNullOrWhiteSpace(name), it => it.Name.Contains(name));//拼接ORexp.Or(it => it.Name.Contains("名称_"));studentList = db.Queryable<StudentInfo>().Where(exp.ToExpression()).ToList();}//模糊查询{studentList = db.Queryable<StudentInfo>().Where(it => it.Name.Contains("名称_")).ToList();//select  * from  StudentInfo where name like %jack%}//根据主键查询{/*单主键查询*///通过主键查询 SingleByIddb.Queryable<StudentInfo>().InSingle(2);//根据ID查询//select * from StudentInfo where id=2db.Queryable<StudentInfo>().Single(it => it.Id == 2);/*多主键查询*/var getAll = db.Queryable<StudentInfo>().WhereClassByPrimaryKey(new StudentInfo() { Id = 123 }).ToList(); //单个实体  getAll = db.Queryable<StudentInfo>().WhereClassByPrimaryKey(new List<StudentInfo>(){new StudentInfo() { Id = 123 },new StudentInfo() { Id = 234 },new StudentInfo() { Id = 345 }}).ToList(); //支持集合}//查询第一条 ，第一行{//First() 等同于C#中的 FirstOrDefault , 没有值返回 null//没有返回NullStudentInfo student = db.Queryable<StudentInfo>().First(it => it.Id == 1);}{//没有返回Null//select top 1 * from StudentInfo order by id desc where id=1StudentInfo student = db.Queryable<StudentInfo>().OrderBy(it => it.Id, OrderByType.Desc).First(it => it.Id == 1);}//查前几条 {List<StudentInfo> studetntlist = db.Queryable<StudentInfo>().Take(10).ToList();}//数据行数{int count1 = db.Queryable<StudentInfo>().Where(it => it.Id > 11).Count();//同步Task<int> countTask = db.Queryable<StudentInfo>().Where(it => it.Id > 11).CountAsync();//异步//select count(*) from StudentInfo where id>11//你也可以用函数//SqlFunc.AggregateCount}//是否存在记录{db.Close();db.Open();bool isExists = db.Queryable<StudentInfo>().Where(it => it.Id > 11).Any();isExists = db.Queryable<StudentInfo>().Any(it => it.Id > 11); //上面语法的简化}//In查询,IN的使用{int[] allIds = new int[] { 2, 3, 31 };List<StudentInfo> list1 = db.Queryable<StudentInfo>().Where(it => allIds.Contains(it.Id)).ToList();//字符串类型 varchar和nvarchar (默认varchar来保证性能)//NameList.Contains(it.Name, true) //true和false来控制是varchar还是nvarchar}//多个字段 条件拼接{List<StudentInfo> OrderList = new List<StudentInfo>(){new StudentInfo{ Id = 1,Name="名称_1"},new StudentInfo{ Id = 2,Name="名称_2"},new StudentInfo{ Id = 3,Name="名称_3"}};Expressionable<StudentInfo> exp = new Expressionable<StudentInfo>();foreach (var item in OrderList){exp.Or(it => it.Id == item.Id && it.Name == item.Name);}//使用构造好的表达式var studentlist = db.Queryable<StudentInfo>().Where(exp.ToExpression()).ToList();}//使用 in 的模糊查询{var names = new string[] { "名称_", "名称_11" };Expressionable<StudentInfo> exp = new Expressionable<StudentInfo>();foreach (var item in names){exp.Or(it => it.Name.Contains(item));}var studentlist = db.Queryable<StudentInfo>().Where(exp.ToExpression()).ToList();}//NOT IN{int[] allIds = new int[] { 2, 3, 31 };var studentlist = db.Queryable<StudentInfo>().Where(it => !allIds.Contains(it.Id)).ToList();}//简单排序{var studentlist = db.Queryable<StudentInfo>().OrderBy(st => st.Id, OrderByType.Desc).ToList();}//查询一列{//单值 查询列 查询单独列var studentlist = db.Queryable<StudentInfo>().Select(it => it.Name).ToList();}//查询单条{StudentInfo student = db.Queryable<StudentInfo>().Single(it => it.Id == 1);//没有返回Null，如果结果大于1条会抛出错误//select * from StudentInfo where id=1 // 查询id等于1的单条记录}//获取最大值,最小值{int maxNum = db.Queryable<StudentInfo>().Max(it => it.Id);//同步 Task<int> maxTask = db.Queryable<StudentInfo>().MaxAsync(it => it.Id);//异步db.Close();db.Open();int minNum = db.Queryable<StudentInfo>().Min(it => it.Id);//同步Task<int> minTask = db.Queryable<StudentInfo>().MinAsync(it => it.Id);//异步}//求和{db.Close();db.Open();int sumNum = db.Queryable<StudentInfo>().Sum(it => it.Id);//同步Task<int> sumTask = db.Queryable<StudentInfo>().SumAsync(it => it.Id);//异步}//查询过滤排除某一个字段{/***单表***/db.Close();db.Open();db.Queryable<StudentInfo>().ToList();db.Queryable<StudentInfo>().IgnoreColumns(it => it.Name).ToList();//只支持单表查询 }
}

[SugarTable("User")]// 
public class User
{[SugarColumn(IsPrimaryKey = true, IsIdentity = true)]//数据库是自增才配自增 public int Id { get; set; }[SugarColumn(ColumnName = "CompanyId", IsNullable = true)]public int? CompanyId { get; set; }[Navigate(NavigateType.ManyToOne, nameof(CompanyId))]public Company? CompanyInfo { get; set; }[SugarColumn(ColumnName = "UserName", IsNullable = true)]//数据库与实体不一样设置列名 public string? UserName { get; set; }[SugarColumn(ColumnName = "CreateTime", IsNullable = true)]public DateTime? CreateTime { get; set; }public int UserDetailId { get; set; }[Navigate(NavigateType.OneToOne, nameof(UserDetailId))]public UserDetail? UserDetailInfo { get; set; } //不能赋值只能是null[Navigate(typeof(UserRoleMapping), nameof(UserRoleMapping.UserId), nameof(UserRoleMapping.RoleId))]//注意顺序public List<Role> RoleList { get; set; } //不能赋值只能是null
}public class Company{[SugarColumn(IsPrimaryKey = true, IsIdentity = true)]public int Id { get; set; }public string? CompanyName { get; set; }public DateTime CreateTime { get; set; }[Navigate(NavigateType.OneToMany, nameof(User.CompanyId))]public List<User>? UserList { get; set; }}
[SugarTable("UserScore")]// 
public class UserScore
{[SugarColumn(IsPrimaryKey = true, IsIdentity = true)]public int Id { get; set; }public int UserId { get; set; }/// <summary>/// 考核指标/// </summary>public string? Subject { get; set; }/// <summary>/// 考核成绩/// </summary>public int Achievement { get; set; }public DateTime? CreateTime { get; set; }}

/// <summary>
/// 连接查询--必然涉及到有多个表
/// </summary>
public static void LinkQueryShow()
{ConnectionConfig connectionConfig = new ConnectionConfig(){ConnectionString = CustomConnectionConfig.ConnectionString001,IsAutoCloseConnection = true,DbType = DbType.SqlServer};using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserScore>();db.Deleteable<UserScore>().ExecuteCommand();db.Deleteable<Company>().ExecuteCommand();db.Deleteable<User>().ExecuteCommand();List<Company> companyList = new List<Company>();for (int i = 0; i < 3; i++){companyList.Add(new Company(){CreateTime = DateTime.Now,Id = i + 1,CompanyName = $"朝夕教育_{i + 1}"});}db.Insertable<Company>(companyList).ExecuteCommand();List<User> userList = new List<User>();List<UserScore> userScoreList = new List<UserScore>();for (int i = 0; i < 10; i++){userList.Add(new User(){CreateTime = DateTime.Now,Id = i + 1,UserName = $"用户_{i + 1}",CompanyId = companyList[0].Id});userScoreList.Add(new UserScore(){UserId = i + 1,Subject = "考勤",Achievement = 90,CreateTime = DateTime.Now});userScoreList.Add(new UserScore(){UserId = i + 1,Subject = "绩效",Achievement = 90,CreateTime = DateTime.Now});userScoreList.Add(new UserScore(){UserId = i + 1,Subject = "项目奖金",Achievement = 89,CreateTime = DateTime.Now});}db.Insertable<User>(userList).ExecuteCommand();db.Insertable<UserScore>(userScoreList).ExecuteCommand();//配置生成sql语句{db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};}//左连接{var query1 = db.Queryable<Company>().LeftJoin<User>((c, u) => c.Id == u.CompanyId).LeftJoin<UserScore>((c, u, us) => u.Id == us.UserId).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();var query2 = db.Queryable<Company, User, UserScore>((c, u, us) =>new JoinQueryInfos(JoinType.Left, c.Id == u.CompanyId, JoinType.Left, u.Id == us.UserId)).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();}//右链接{var query1 = db.Queryable<Company>().RightJoin<User>((c, u) => c.Id == u.CompanyId).RightJoin<UserScore>((c, u, us) => u.Id == us.UserId).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();var query2 = db.Queryable<Company, User, UserScore>((c, u, us) =>new JoinQueryInfos(JoinType.Right, c.Id == u.CompanyId, JoinType.Right, u.Id == us.UserId)).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();}//内连接{var query1 = db.Queryable<Company>().InnerJoin<User>((c, u) => c.Id == u.CompanyId).InnerJoin<UserScore>((c, u, us) => u.Id == us.UserId).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();var query2 = db.Queryable<Company, User, UserScore>((c, u, us) =>new JoinQueryInfos(JoinType.Inner, c.Id == u.CompanyId, JoinType.Inner, u.Id == us.UserId)).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();}//全连接{var query1 = db.Queryable<Company>().FullJoin<User>((c, u) => c.Id == u.CompanyId).FullJoin<UserScore>((c, u, us) => u.Id == us.UserId).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();var query2 = db.Queryable<Company, User, UserScore>((c, u, us) =>new JoinQueryInfos(JoinType.Full, c.Id == u.CompanyId, JoinType.Full, u.Id == us.UserId)).Where(c => c.Id == 1).Select((c, u, us) => new{CompanyId = c.Id,CompanyName = c.CompanyName,UserNae = u.UserName,Subject = us.Subject,ScoreCoutn = us.Achievement}).ToList();}//并集{var q1 = db.Queryable<Student>().Select(it => new User { UserName = it.Name });var q2 = db.Queryable<User>().Select(it => new User { UserName = it.UserName });var list = db.UnionAll(q1, q2).ToList();}};
}

public enum NavigateType
{OneToOne = 1,OneToMany,ManyToOne,ManyToMany,Dynamic
}
///NavigateType.OneToOne[SugarTable("User")]// public class User{[SugarColumn(IsPrimaryKey = true, IsIdentity = true)]//数据库是自增才配自增 public int Id { get; set; }[SugarColumn(ColumnName = "CompanyId", IsNullable = true)]public int? CompanyId { get; set; }[Navigate(NavigateType.ManyToOne, nameof(CompanyId))]public Company? CompanyInfo { get; set; }[SugarColumn(ColumnName = "UserName", IsNullable = true)]//数据库与实体不一样设置列名 public string? UserName { get; set; }[SugarColumn(ColumnName = "CreateTime", IsNullable = true)]public DateTime? CreateTime { get; set; }public int UserDetailId { get; set; }[Navigate(NavigateType.OneToOne, nameof(UserDetailId))]public UserDetail? UserDetailInfo { get; set; } //不能赋值只能是null[Navigate(typeof(UserRoleMapping), nameof(UserRoleMapping.UserId), nameof(UserRoleMapping.RoleId))]//注意顺序public List<Role> RoleList { get; set; } //不能赋值只能是null}public class StudentA{[SugarColumn(IsPrimaryKey = true)]public int StudentId { get; set; }public string? Name { get; set; }public int SchoolId { get; set; }[SugarColumn(IsIgnore = true)]public SchoolA SchoolA { get; set; }[Navigate(NavigateType.Dynamic, null)] //自定义关系映射public List<BookA> Books { get; set; } //只能是null 不能赋默认值 }public class BookA{[SugarColumn(IsPrimaryKey = true, IsIdentity = true)]public int BookId { get; set; }public string? Name { get; set; }public int studenId { get; set; }}public class SchoolA{[SugarColumn(IsPrimaryKey = true)]public int SchoolId { get; set; }public string? SchoolName { get; set; }[SugarColumn(IsIgnore = true)]public List<RoomA> RoomList { get; set; }[SugarColumn(IsIgnore = true)]public List<TeacherA> TeacherList { get; set; }}public class TeacherA{[SugarColumn(IsPrimaryKey = true)]public int Id { get; set; }public int SchoolId { get; set; }public string? Name { get; set; }}public class RoomA{[SugarColumn(IsPrimaryKey = true)]public int RoomId { get; set; }public string? RoomName { get; set; }public int SchoolId { get; set; }}

/// <summary>
/// 导航属性 
/// </summary>
public static void NavigationPropertiesShow()
{ConnectionConfig connectionConfig = new ConnectionConfig(){ConnectionString = CustomConnectionConfig.ConnectionString001,IsAutoCloseConnection = true,DbType = DbType.SqlServer};using (SqlSugarClient db = new SqlSugarClient(connectionConfig)){{db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};}#region 一对一关系 {if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("UserDetail", false)){db.DbMaintenance.DropTable<UserDetail>();}db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserDetail>();db.DeleteNav<User>(c => c.Id > 0).Include(c => c.UserDetailInfo).ExecuteCommand();List<User> users = new List<User>(){new User(){CompanyId = 1,UserName = "Richard",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北武汉",Description = ".NET金牌讲师"}},new User(){CompanyId = 1,UserName = "cole老师号",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北黄冈",Description = "金牌助教"}}};//导航属性新增bool bResult = db.InsertNav(users).Include(z1 => z1.UserDetailInfo).ExecuteCommand();//导航属性查询 var list1 = db.Queryable<User>().Includes(t => t.UserDetailInfo) //多层级 .ToList();var list2 = db.Queryable<User>().Includes(t => t.UserDetailInfo) //多层级 .Where(c => c.UserName == "Richard").ToList();list2[0].UserName = "Richard老师";list2[0].UserDetailInfo.Address = "湖北武汉汉阳";bool bResult1 = db.UpdateNav(list2).Include(u => u.UserDetailInfo).ExecuteCommand();bool bResult2 = db.DeleteNav<User>(list2).Include(c => c.UserDetailInfo).ExecuteCommand();}#endregion#region 一对多关系 {if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("Company", false)){db.DbMaintenance.DropTable<Company>();}db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();//导航删除db.DeleteNav<Company>(c => c.Id > 0).Include(c => c.UserList).ExecuteCommand();List<Company> companies = new List<Company>(){new Company(){CompanyName="朝夕教育",CreateTime= DateTime.Now,UserList=new List<User>(){new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Eleven"},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Richard",UserDetailInfo=new UserDetail{Address="湖北武汉汉阳",Description="金牌讲师"}},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Gerry"}}},new Company(){CompanyName="腾讯课堂",CreateTime= DateTime.Now,}};//导航新增db.InsertNav(companies).Include(c => c.UserList).ExecuteCommand();//一对多导航查询var list = db.Queryable<Company>().Includes(t => t.UserList).ToList();var userlist = db.Queryable<User>().Includes(u => u.CompanyInfo).ToList();var list1 = db.Queryable<Company>().Includes(x => x.UserList.Where(u => u.UserName == "Richard").ToList()).Where(x => x.CompanyName.Contains("朝夕教育")).ToList();list1[0].CompanyName = "朝夕教育-金牌机构";list1[0].UserList[0].UserName = "Richard老师";//修改bool bResult2 = db.UpdateNav(list1).Include(u => u.UserList).ExecuteCommand();///删除bool bResult3 = db.DeleteNav(list1).Include(u => u.UserList).ExecuteCommand();}#endregion#region 多对多关系 {if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("Role", false)){db.DbMaintenance.DropTable<Role>();}if (db.DbMaintenance.IsAnyTable("UserRoleMapping", false)){db.DbMaintenance.DropTable<UserRoleMapping>();}db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<Role>();db.CodeFirst.InitTables<UserRoleMapping>();List<User> users = new List<User>(){new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Richard老师",RoleList=new List<Role>(){new Role(){CreateTime= DateTime.Now,RoleName="管理员"},new Role(){CreateTime= DateTime.Now,RoleName="金牌讲师"}}}};db.InsertNav(users).Include(u => u.RoleList)// 插入第一层 SchoolA .ExecuteCommand();var list1 = db.Queryable<User>().Includes(x => x.RoleList).ToList();var list2 = db.Queryable<User>().Includes(x => x.RoleList.Where(r => r.RoleName == "管理员").ToList()).Where(c => c.UserName.Equals("Richard老师")).ToList();bool bResult = db.UpdateNav(list2).Include(u => u.RoleList).ExecuteCommand();bool bResult1 = db.DeleteNav(list1).Include(u => u.RoleList).ExecuteCommand();int iResult1 = db.Deleteable(list1).ExecuteCommand();var roles = db.Queryable<Role>().ToList();int iResult2 = db.Deleteable(roles).ExecuteCommand();}#endregion#region  手动、指定字段、多字段{if (db.DbMaintenance.IsAnyTable("StudentA", false)){db.DbMaintenance.DropTable<StudentA>();}if (db.DbMaintenance.IsAnyTable("BookA", false)){db.DbMaintenance.DropTable<BookA>();}db.CodeFirst.InitTables<StudentA>();db.CodeFirst.InitTables<BookA>();List<StudentA> studentAs = new List<StudentA>(){new StudentA(){StudentId= 1,Name="张三同学",}};List<BookA> bookAs = new List<BookA>(){new BookA(){studenId= 1,Name="语文",},new BookA(){studenId= 1,Name="数学",}};db.Insertable(studentAs).ExecuteCommand();db.Insertable(bookAs).ExecuteCommand();var list = db.Queryable<StudentA>().Includes(it => it.Books.MappingField(z => z.studenId, () => it.StudentId).Where(z => z.BookId == 1).ToList()).ToList();}#endregion#region 性能优化，{if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("Company", false)){db.DbMaintenance.DropTable<Company>();}db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();//导航删除db.DeleteNav<Company>(c => c.Id > 0).Include(c => c.UserList).ExecuteCommand();List<Company> companies = new List<Company>();for (int i = 0; i < 5000; i++){Company company = new Company(){CompanyName = $"朝夕教育_{i}",CreateTime = DateTime.Now};List<User> userlist = new List<User>();for (int j = 0; j < 10; j++){User user = new User(){CompanyId = 1,CreateTime = DateTime.Now,UserName = $"学员_{j}"};userlist.Add(user);}company.UserList = userlist;companies.Add(company);}db.InsertNav<Company>(companies).Include(c => c.UserList).ExecuteCommand();Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");List<Company> resultList = new List<Company>();db.Queryable<Company>().Includes(it => it.UserList).ForEach(it => resultList.Add(it), 300); //每次查询300条}#endregion#region 数据映射{AutoMapper List<Company> companies = db.Queryable<Company>().Includes(it => it.UserList).ToList(); //每次查询300条 List<CompanyDto> dtoList = companies.Adapt<List<CompanyDto>>();}#endregion#region 导航方法{if (db.DbMaintenance.IsAnyTable("Company", false)){db.DbMaintenance.DropTable<Company>();}if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("UserDetail", false)){db.DbMaintenance.DropTable<UserDetail>();}db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserDetail>();List<Company> companies = new List<Company>(){new Company(){CompanyName="朝夕教育",CreateTime= DateTime.Now,UserList=new List<User>(){new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Eleven"},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Richard",UserDetailInfo=new UserDetail{Address="湖北武汉汉阳",Description="金牌讲师"}},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Gerry"}}},new Company(){CompanyName="腾讯课堂",CreateTime= DateTime.Now,}};//导航新增db.InsertNav(companies).Include(c => c.UserList).ThenInclude(u => u.UserDetailInfo).ExecuteCommand();Console.WriteLine("================================");List<Company> companyList1 = db.Queryable<Company>()//.Where(c=>c.UserList.Count()>0).Where(it => it.UserList.Any()).ToList();List<Company> companyList2 = db.Queryable<Company>().Where(it => it.UserList.Any(c => c.UserName.Equals("Richard"))).ToList();if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("UserDetail", false)){db.DbMaintenance.DropTable<UserDetail>();}db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserDetail>();db.DeleteNav<User>(c => c.Id > 0).Include(c => c.UserDetailInfo).ExecuteCommand();List<User> users = new List<User>(){new User(){CompanyId = 1,UserName = "Richard",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北武汉",Description = ".NET金牌讲师"}},new User(){CompanyId = 1,UserName = "cole老师号",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北黄冈",Description = "金牌助教"}}};db.InsertNav(users).Include(c => c.CompanyInfo).ExecuteCommand();List<User> userlist = db.Queryable<User>().Where(x => SqlFunc.Exists(x.UserDetailInfo.Id)).ToList();}#endregion#region 联表导航{Console.WriteLine("================联表导航=====================");if (db.DbMaintenance.IsAnyTable("StudentA", false)){db.DbMaintenance.DropTable<StudentA>();}if (db.DbMaintenance.IsAnyTable("RoomA", false)){db.DbMaintenance.DropTable<RoomA>();}if (db.DbMaintenance.IsAnyTable("SchoolA", false)){db.DbMaintenance.DropTable<SchoolA>();}if (db.DbMaintenance.IsAnyTable("TeacherA", false)){db.DbMaintenance.DropTable<TeacherA>();}db.CodeFirst.InitTables<StudentA, RoomA, SchoolA, TeacherA>();db.DbMaintenance.TruncateTable<StudentA>();db.DbMaintenance.TruncateTable<RoomA>();db.DbMaintenance.TruncateTable<SchoolA>();db.DbMaintenance.TruncateTable<TeacherA>();db.Insertable(new RoomA() { RoomId = 1, RoomName = "北大001室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 2, RoomName = "北大002室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 3, RoomName = "北大003室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 4, RoomName = "清华001厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 5, RoomName = "清华002厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 6, RoomName = "清华003厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new SchoolA() { SchoolId = 1, SchoolName = "北大" }).ExecuteCommand();db.Insertable(new SchoolA() { SchoolId = 2, SchoolName = "清华" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 1, SchoolId = 1, Name = "北大jack" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 2, SchoolId = 1, Name = "北大tom" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 3, SchoolId = 2, Name = "清华jack" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 4, SchoolId = 2, Name = "清华tom" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 1, Id = 1, Name = "北大老师01" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 1, Id = 2, Name = "北大老师02" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 2, Id = 3, Name = "清华老师01" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 2, Id = 4, Name = "清华老师02" }).ExecuteCommand();Console.WriteLine("=================================================");var list = db.Queryable<StudentA>().ToList();//这儿也可以联表查询//var list1 = db.Queryable<StudentA>().Includes(c=>c.SchoolA).ToList();//这儿也可以联表查询db.ThenMapper(list, stu =>{//如果加Where不能带有stu参数，stu参数写到 SetContextstu.SchoolA = db.Queryable<SchoolA>().SetContext(scl => scl.SchoolId, () => stu.SchoolId, stu).FirstOrDefault();});}#endregion#region 实现无限层--树 {if (db.DbMaintenance.IsAnyTable("Tree", false)){db.DbMaintenance.DropTable<Tree>();}db.CodeFirst.InitTables<Tree>();Tree tree = new Tree(){Id = 1,Name = "一级树",ParentId = 0,Child = new List<Tree>{new Tree(){ParentId=1,Id = 5,Name="二级目录-1",Child=new List<Tree>{new Tree() {Id = 6,Name="三级目录-1",ParentId=2,Child=new List<Tree>{new Tree() {Id = 7,ParentId=6,Name="四级目录-1"}}}}}}};db.InsertNav<Tree>(tree).Include(it => it.Child).ThenInclude(c => c.Child).ThenInclude(c1 => c1.Child).ThenInclude(c2 => c2.Child).ExecuteCommand();var treeRoot = db.Queryable<Tree>().Where(it => it.Id == 1).ToList();//第一层db.ThenMapper(treeRoot, item =>{item.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => item.Id, item).ToList();});//第二层db.ThenMapper(treeRoot.SelectMany(it => it.Child), it =>{it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();});//第三层db.ThenMapper(treeRoot.SelectMany(it => it.Child).SelectMany(it => it.Child), it =>{it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();});List<Tree> list = db.Queryable<Tree>().ToTree(it => it.Child, it => it.ParentId, 0);}#endregion }
}

db.ThenMapper(list, stu =>
{
//如果加Where不能带有stu参数，stu参数写到 SetContext
stu.SchoolA = db.Queryable<SchoolA>().SetContext(scl => scl.SchoolId, () =>
stu.SchoolId, stu).FirstOrDefault();
//可以联查询的
//stu.xxxx=db.Queryable<SchoolA>().LeftJoin<XXX>
().Select(xxxx).SetContext(....).ToList();
});

#region 性能优化，
{if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("Company", false)){db.DbMaintenance.DropTable<Company>();}db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();//导航删除db.DeleteNav<Company>(c => c.Id > 0).Include(c => c.UserList).ExecuteCommand();List<Company> companies = new List<Company>();for (int i = 0; i < 5000; i++){Company company = new Company(){CompanyName = $"朝夕教育_{i}",CreateTime = DateTime.Now};List<User> userlist = new List<User>();for (int j = 0; j < 10; j++){User user = new User(){CompanyId = 1,CreateTime = DateTime.Now,UserName = $"学员_{j}"};userlist.Add(user);}company.UserList = userlist;companies.Add(company);}db.InsertNav<Company>(companies).Include(c => c.UserList).ExecuteCommand();Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");Console.WriteLine("====================================================================");List<Company> resultList = new List<Company>();db.Queryable<Company>().Includes(it => it.UserList).ForEach(it => resultList.Add(it), 300); //每次查询300条
}#endregion

3.11、查询映射

List<Company> companies= db.Queryable<Company>()
.Includes(it => it.UserList)
.ToList(); //每次查询300条
var dtoList = companies.Adapt<List<CompanyDto>>();

 #region 数据映射{AutoMapper List<Company> companies = db.Queryable<Company>().Includes(it => it.UserList).ToList(); //每次查询300条 List<CompanyDto> dtoList = companies.Adapt<List<CompanyDto>>();}#endregion

List<Company> companyList1 = db.Queryable<Company>()
.Where(it => it.UserList.Any())
.ToList();
List<Company> companyList2 = db.Queryable<Company>()
.Where(it => it.UserList.Any(c => c.UserName.Equals("Richard")))
.ToList();

#region 导航方法{if (db.DbMaintenance.IsAnyTable("Company", false)){db.DbMaintenance.DropTable<Company>();}if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("UserDetail", false)){db.DbMaintenance.DropTable<UserDetail>();}db.CodeFirst.InitTables<Company>();db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserDetail>();List<Company> companies = new List<Company>(){new Company(){CompanyName="朝夕教育",CreateTime= DateTime.Now,UserList=new List<User>(){new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Eleven"},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Richard",UserDetailInfo=new UserDetail{Address="湖北武汉汉阳",Description="金牌讲师"}},new User(){CompanyId=1,CreateTime= DateTime.Now,UserName="Gerry"}}},new Company(){CompanyName="腾讯课堂",CreateTime= DateTime.Now,}};//导航新增db.InsertNav(companies).Include(c => c.UserList).ThenInclude(u => u.UserDetailInfo).ExecuteCommand();Console.WriteLine("================================");List<Company> companyList1 = db.Queryable<Company>()//.Where(c=>c.UserList.Count()>0).Where(it => it.UserList.Any()).ToList();List<Company> companyList2 = db.Queryable<Company>().Where(it => it.UserList.Any(c => c.UserName.Equals("Richard"))).ToList();if (db.DbMaintenance.IsAnyTable("User", false)){db.DbMaintenance.DropTable<User>();}if (db.DbMaintenance.IsAnyTable("UserDetail", false)){db.DbMaintenance.DropTable<UserDetail>();}db.CodeFirst.InitTables<User>();db.CodeFirst.InitTables<UserDetail>();db.DeleteNav<User>(c => c.Id > 0).Include(c => c.UserDetailInfo).ExecuteCommand();List<User> users = new List<User>(){new User(){CompanyId = 1,UserName = "Richard",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北武汉",Description = ".NET金牌讲师"}},new User(){CompanyId = 1,UserName = "cole老师号",CreateTime = DateTime.Now,UserDetailInfo = new UserDetail(){Address = "湖北黄冈",Description = "金牌助教"}}};db.InsertNav(users).Include(c => c.CompanyInfo).ExecuteCommand();List<User> userlist = db.Queryable<User>().Where(x => SqlFunc.Exists(x.UserDetailInfo.Id)).ToList();}#endregion

db.ThenMapper(list, stu =>
{
//如果加Where不能带有stu参数，stu参数写到 SetContext
stu.SchoolA = db.Queryable<SchoolA>().SetContext(scl => scl.SchoolId, () =>
stu.SchoolId, stu).FirstOrDefault();
//可以联查询的
//stu.xxxx=db.Queryable<SchoolA>().LeftJoin<XXX>
().Select(xxxx).SetContext(....).ToList();
});

   #region 联表导航{Console.WriteLine("================联表导航=====================");if (db.DbMaintenance.IsAnyTable("StudentA", false)){db.DbMaintenance.DropTable<StudentA>();}if (db.DbMaintenance.IsAnyTable("RoomA", false)){db.DbMaintenance.DropTable<RoomA>();}if (db.DbMaintenance.IsAnyTable("SchoolA", false)){db.DbMaintenance.DropTable<SchoolA>();}if (db.DbMaintenance.IsAnyTable("TeacherA", false)){db.DbMaintenance.DropTable<TeacherA>();}db.CodeFirst.InitTables<StudentA, RoomA, SchoolA, TeacherA>();db.DbMaintenance.TruncateTable<StudentA>();db.DbMaintenance.TruncateTable<RoomA>();db.DbMaintenance.TruncateTable<SchoolA>();db.DbMaintenance.TruncateTable<TeacherA>();db.Insertable(new RoomA() { RoomId = 1, RoomName = "北大001室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 2, RoomName = "北大002室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 3, RoomName = "北大003室", SchoolId = 1 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 4, RoomName = "清华001厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 5, RoomName = "清华002厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new RoomA() { RoomId = 6, RoomName = "清华003厅", SchoolId = 2 }).ExecuteCommand();db.Insertable(new SchoolA() { SchoolId = 1, SchoolName = "北大" }).ExecuteCommand();db.Insertable(new SchoolA() { SchoolId = 2, SchoolName = "清华" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 1, SchoolId = 1, Name = "北大jack" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 2, SchoolId = 1, Name = "北大tom" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 3, SchoolId = 2, Name = "清华jack" }).ExecuteCommand();db.Insertable(new StudentA() { StudentId = 4, SchoolId = 2, Name = "清华tom" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 1, Id = 1, Name = "北大老师01" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 1, Id = 2, Name = "北大老师02" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 2, Id = 3, Name = "清华老师01" }).ExecuteCommand();db.Insertable(new TeacherA() { SchoolId = 2, Id = 4, Name = "清华老师02" }).ExecuteCommand();Console.WriteLine("=================================================");var list = db.Queryable<StudentA>().ToList();//这儿也可以联表查询//var list1 = db.Queryable<StudentA>().Includes(c=>c.SchoolA).ToList();//这儿也可以联表查询db.ThenMapper(list, stu =>{//如果加Where不能带有stu参数，stu参数写到 SetContextstu.SchoolA = db.Queryable<SchoolA>().SetContext(scl => scl.SchoolId, () => stu.SchoolId, stu).FirstOrDefault();});}#endregion

var treeRoot = db.Queryable<Tree>().Where(it => it.Id == 1).ToList();
//第一层
db.ThenMapper(treeRoot, item =>
{
item.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () =>
item.Id, item).ToList();
});
//第二层

 public class Tree{[SugarColumn(IsPrimaryKey = true)]public int Id { get; set; }public string? Name { get; set; }public int ParentId { get; set; } //在树查询中Parentid 是特殊的；[SugarColumn(IsIgnore = true)][Navigate(NavigateType.OneToMany, nameof(ParentId))]//设置导航 一对一public List<Tree>? Child { get; set; }}

#region 实现无限层--树 
{if (db.DbMaintenance.IsAnyTable("Tree", false)){db.DbMaintenance.DropTable<Tree>();}db.CodeFirst.InitTables<Tree>();Tree tree = new Tree(){Id = 1,Name = "一级树",ParentId = 0,Child = new List<Tree>{new Tree(){ParentId=1,Id = 5,Name="二级目录-1",Child=new List<Tree>{new Tree() {Id = 6,Name="三级目录-1",ParentId=2,Child=new List<Tree>{new Tree() {Id = 7,ParentId=6,Name="四级目录-1"}}}}}}};db.InsertNav<Tree>(tree).Include(it => it.Child).ThenInclude(c => c.Child).ThenInclude(c1 => c1.Child).ThenInclude(c2 => c2.Child).ExecuteCommand();var treeRoot = db.Queryable<Tree>().Where(it => it.Id == 1).ToList();//第一层db.ThenMapper(treeRoot, item =>{item.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => item.Id, item).ToList();});//第二层db.ThenMapper(treeRoot.SelectMany(it => it.Child), it =>{it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();});//第三层db.ThenMapper(treeRoot.SelectMany(it => it.Child).SelectMany(it => it.Child), it =>{it.Child = db.Queryable<Tree>().SetContext(x => x.ParentId, () => it.Id, it).ToList();});List<Tree> list = db.Queryable<Tree>().ToTree(it => it.Child, it => it.ParentId, 0);
}#endregion 

#region 树递归查询{//if (db.DbMaintenance.IsAnyTable("Tree", false))//{//    db.DbMaintenance.DropTable<Tree>();//}//db.CodeFirst.InitTables<Tree>();//Tree tree = new Tree()//{//    Id = 1,//    Name = "一级树",//    ParentId = 0,//    Child = new List<Tree>//    {//        new Tree()//        {//            ParentId=1,//            Id = 5,//            Name="二级目录-1",//            Child=new List<Tree>//            {//                new Tree() {//                     Id = 6,//                     Name="三级目录-1",//                     ParentId=2,//                     Child=new List<Tree>//                     {//                         new Tree() {//                             Id = 7,//                             ParentId=6,//                             Name="四级目录-1"//                         }//                     }//                }//            }//        }//    }//};//db.InsertNav<Tree>(tree)//    .Include(it => it.Child)//    .ThenInclude(c => c.Child)//    .ThenInclude(c1 => c1.Child)//    .ThenInclude(c2 => c2.Child)//    .ExecuteCommand();查询所有下级从ParentId 为0 开始查询下级//List<Tree> childlist = db.Queryable<Tree>().ToTree(it => it.Child, it => it.ParentId, 0);查询所有上级//List<Tree> parentlist = db.Queryable<Tree>().ToParentList(it => it.ParentId, 6);条件查询，树形查询//List<Tree> treelist = db.Queryable<Tree>().Where(it => it.ParentId > 5)//    .ToTree(it => it.Child, it => it.ParentId, 0);//if (db.DbMaintenance.IsAnyTable("Tree2", false))//{//    db.DbMaintenance.DropTable<Tree2>();//}//db.CodeFirst.InitTables<Tree2>();//List<Tree2> tree2addlist = new List<Tree2>()//{ //    new Tree2()//    {//        Name = "一级树",//        ParentCode ="",//        Code="001"//    },//    new Tree2()//    {//        ParentCode="001", //        Name="二级目录-1",//        Code="002"//    },//    new Tree2() //    {//        Name="三级目录-1",//        ParentCode="002",//        Code="003"//    },//    new Tree2() //    { //        ParentCode="003",//        Name="四级目录-1",//        Code="004"//    }//}; //db.Insertable<Tree2>(tree2addlist) //    .ExecuteCommand();//List<Tree2> child21list = db.Queryable<Tree2>().ToTree(it => it.Child, it => it.ParentCode, "001");//List<Tree2> child22list = db.Queryable<Tree2>().ToTree(it => it.Child, it => it.ParentCode, "002");查询所有上级//List<Tree2> parent2list = db.Queryable<Tree2>().ToParentList(it => it.Child, "004");条件查询，树形查询//List<Tree2> tree2list = db.Queryable<Tree2>().Where(it => it.Name.Contains("目录"))//    .ToTree(it => it.Child, it => it.ParentCode, "001");}#endregion

#region 表达式目录树{//表达式目录树连写{Console.WriteLine("========================================================================");string CompanyName = "";int? id = 1;//用例1:连写  不等于空 后面Expression<Func<Company, bool>> exp = Expressionable.Create<Company>() //创建表达式.AndIF(string.IsNullOrWhiteSpace(CompanyName) == false, it => it.CompanyName == CompanyName).AndIF(id != null, it => it.Id == id).ToExpression();//注意 这一句 不能少 var list = db.Queryable<Company>().Where(exp).ToList();//直接用就行了不需要判段 null和加true}//表达式目录树分开写{Console.WriteLine("========================================================================");string CompanyName = "音娱乐行";int? id = 1;Expressionable<Company> expable = Expressionable.Create<Company>();if (string.IsNullOrWhiteSpace(CompanyName) == false){expable.And(it => it.CompanyName == CompanyName);}if (id != null){expable.And(it => it.CompanyName == CompanyName);}Expression<Func<Company, bool>> exp = expable.ToExpression();//要用变量 var exp=db.Queryable<Company>().Where(exp).ToList();//直接用就行了不需要判段 null和加true}//拓展用例{Console.WriteLine("========================================================================");var names = new string[] { "音娱乐行", "乐善其行" };Expressionable<Company> exp = Expressionable.Create<Company>();foreach (var item in names){exp.Or(it => it.CompanyName.Contains(item.ToString()));}var list = db.Queryable<Company>().Where(exp.ToExpression()).ToList();}// Queyable.Or{Console.WriteLine("========================================================================");var exp = Expressionable.Create<Company>().And(it => it.Id == 1).Or(it => it.Id == 100).ToExpression();//注意 这一句 不能少var list = db.Queryable<Company>().Where(exp).ToList();}//解析表达式目录树{Console.WriteLine("========================================================================");var expContext = new SqlServerExpressionContext();Expression<Func<Company, bool>> exp = c => c.CompanyName.Contains("朝夕教育");expContext.Resolve(exp, ResolveExpressType.WhereSingle);var wheresql = expContext.Result.GetString();var pars = expContext.Parameters;db.Queryable<Company>().Where(wheresql).AddParameters(pars).ToList();}//匿名表达式解析{Console.WriteLine("========================================================================");DbType dbtype = DbType.SqlServer;ExpressionContext expContext = null;switch (dbtype){case DbType.MySql:expContext = new MySqlExpressionContext();break;case DbType.SqlServer:expContext = new SqlServerExpressionContext();break;case DbType.Sqlite:expContext = new SqliteExpressionContext();break;case DbType.Oracle:expContext = new OracleExpressionContext();break;case DbType.PostgreSQL:expContext = new PostgreSQLExpressionContext();break;case DbType.Dm:expContext = new DmExpressionContext();break;case DbType.Kdbndp:expContext = new KdbndpExpressionContext();break;default:throw new Exception("不支持");}Expression<Func<Company, bool>> exp = c => c.CompanyName.Contains("朝夕教育");expContext.Resolve(exp, ResolveExpressType.WhereSingle);var wheresql = expContext.Result.GetString();var pars = expContext.Parameters;db.Queryable<Company>().Where(wheresql).AddParameters(pars).ToList();}#region Where条件解析{Console.WriteLine("========================================================================");var expContext = new SqlServerExpressionContext();Expression<Func<Company, bool>> exp = it => it.CompanyName.Contains("音娱乐行");expContext.Resolve(exp, ResolveExpressType.WhereSingle);var value = expContext.Result.GetString();var pars = expContext.Parameters;}#endregion#region Where-Like解析{Console.WriteLine("========================================================================");Expression<Func<Student, bool>> exp = it => it.Name.Contains("Richard老师");ExpressionContext expContext = new ExpressionContext();expContext.Resolve(exp, ResolveExpressType.WhereMultiple);var value = expContext.Result.GetString();var pars = expContext.Parameters;}#endregion#region Select的解析 {Console.WriteLine("========================================================================");Expression<Func<Company, CompanyDto>> exp = it => new CompanyDto(){CompanyName = it.CompanyName,CreateTime = it.CreateTime,};ExpressionContext expContext = new ExpressionContext();expContext.IsSingle = false;expContext.Resolve(exp, ResolveExpressType.SelectSingle);var selectorValue = expContext.Result.GetString();var pars = expContext.Parameters;}#endregion }#endregion 

#region 跨库查询{List<ConnectionConfig> connetctionlist = new List<ConnectionConfig>(){new ConnectionConfig(){ConfigId="db1",DbType=DbType.SqlServer,ConnectionString=CustomConnectionConfig.ConnectionString001,IsAutoCloseConnection=true},new ConnectionConfig(){ConfigId="db2",DbType=DbType.SqlServer,ConnectionString=CustomConnectionConfig.ConnectionString003,IsAutoCloseConnection=true}};using (SqlSugarClient db = new SqlSugarClient(connetctionlist)){{db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};}db.GetConnection("db1").DbMaintenance.CreateDatabase();db.GetConnection("db2").DbMaintenance.CreateDatabase();if (db.GetConnection("db1").DbMaintenance.IsAnyTable("OrderHead", false)){db.GetConnection("db1").DbMaintenance.DropTable<OrderHead>();}if (db.GetConnection("db2").DbMaintenance.IsAnyTable("OrderItem", false)){db.GetConnection("db2").DbMaintenance.DropTable<OrderItem>();}db.GetConnection("db1").CodeFirst.InitTables<OrderHead>();db.GetConnection("db2").CodeFirst.InitTables<OrderItem>();List<OrderHead> orders = new List<OrderHead>(){new OrderHead(){Id= 1,Name="自行车订单",Price=3000,CreateTime=DateTime.Now,CountInfo=1,}};List<OrderItem> itemsList = new List<OrderItem>(){new OrderItem(){CreateTime=DateTime.Now,Price=2900,ItemId=1,OrderId=1,},new OrderItem(){CreateTime=DateTime.Now,Price=100,ItemId=2,OrderId=1,}};db.GetConnection("db1").Insertable(orders).ExecuteCommand();db.GetConnection("db2").Insertable(itemsList).ExecuteCommand();//通过实体类特性Tenant自动映射不同数据库进行查询{var list = db.QueryableWithAttr<OrderItem>().Includes(z => z.Order).ToList(); //1行代码就搞定了2个库联表查询var list1 = db.QueryableWithAttr<OrderHead>().Includes(z => z.Items).ToList(); //1行代码就搞定了2个库联表查询}//不通过特性实现跨库导航{var list = db.GetConnection("db2").Queryable<OrderItem>()//Orderitem是db2.CrossQuery(typeof(OrderHead), "db1")//Order是db1.Includes(z => z.Order).ToList();var list1 = db.GetConnection("db1").Queryable<OrderHead>()//Orderitem是db2.CrossQuery(typeof(OrderItem), "db2")//Order是db1.Includes(z => z.Items).ToList();}{var list = db.Queryable<OrderHead>().AS("ZhaoxiSqlSugarDb.dbo.OrderHead").ToList();//多表跨库var list1 = db.Queryable<OrderHead>().AS("ZhaoxiSqlSugarDb.dbo.OrderHead") // AS("").LeftJoin<OrderItem>((o, i) => o.Id == i.OrderId).AS<OrderItem>("ZhaoxiSqlSugarDb_Item.dbo.OrderItem") //AS<T>  .ToList();}}}#endregion

#region 初始化表结构和数据
{db.Aop.OnLogExecuting = (s, p) =>{Console.WriteLine("----------------------------");Console.WriteLine($"Sql语句:{s}");};if (db.DbMaintenance.IsAnyTable("Operateinfo", false)){db.DbMaintenance.DropTable<Operateinfo>();}db.CodeFirst.InitTables<Operateinfo>();List<Operateinfo> list = new List<Operateinfo>();for (int i = 0; i < 100000; i++){list.Add(new Operateinfo(){Operate_time = DateTime.Now.AddMonths(new Random().Next(-6, 6)).AddYears(new Random().Next(-20, 20)),Operate_Type = i,Userid = i,});}db.Fastest<Operateinfo>().BulkCopy(list);
}
#endregion//统计当前年份
{Console.WriteLine("统计当前年份");var queryableLeft = db.Reportable(ReportableDateType.MonthsInLast1years).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlistx = db.Queryable(queryableLeft).ToList();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var queryableLeft1 = resultlist.Sum(c => c.count);int lastYearcoutn = db.Queryable<Operateinfo>().Count(c => c.Operate_time.Year == 2022);
}{//统计最近三年Console.WriteLine("统计最近三年");var queryableLeft = db.Reportable(ReportableDateType.MonthsInLast3years).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var threeYearCount = resultlist.Sum(c => c.count);int threeYearCount1 = db.Queryable<Operateinfo>().Count(c => c.Operate_time.Year == 2022 || c.Operate_time.Year == 2021 || c.Operate_time.Year == 2020);}{//统计最近10年;Console.WriteLine("最近10年");var queryableLeft = db.Reportable(ReportableDateType.MonthsInLast10years).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var tenYearCount = resultlist.Sum(c => c.count);int tenYearCount1 = db.Queryable<Operateinfo>().Count(c => c.Operate_time.Year == 2022|| c.Operate_time.Year == 2021|| c.Operate_time.Year == 2020|| c.Operate_time.Year == 2019|| c.Operate_time.Year == 2018|| c.Operate_time.Year == 2017|| c.Operate_time.Year == 2016|| c.Operate_time.Year == 2015|| c.Operate_time.Year == 2014|| c.Operate_time.Year == 2013);
}{//统计今年一月份统计 Console.WriteLine("统计今年一月份统计 ");var queryableLeft = db.Reportable(ReportableDateType.years1).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var years1Count1 = resultlist.Sum(c => c.count);int years1Count2 = db.Queryable<Operateinfo>().Count(c => c.Operate_time.Year == 2022 && c.Operate_time.Month == 1);}{//最近三年一月份统计 Console.WriteLine("最近三年一月份统计  ");var queryableLeft = db.Reportable(ReportableDateType.years3).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var years1Count = resultlist.Sum(c => c.count);int years1Count1 = db.Queryable<Operateinfo>().Count(c => (c.Operate_time.Year == 2022 && c.Operate_time.Month == 1) || (c.Operate_time.Year == 2021 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2020 && c.Operate_time.Month == 1));
}{//最近10年一月份统计 Console.WriteLine("最近10年一月份统计 ");var queryableLeft = db.Reportable(ReportableDateType.years10).ToQueryable<DateTime>();var queryableRight = db.Queryable<Operateinfo>();var resultlist = db.Queryable(queryableLeft, queryableRight, JoinType.Left, (x1, x2) => x2.Operate_time.ToString("yyyy-MM") == x1.ColumnName.ToString("yyyy-MM")).GroupBy((x1, x2) => x1.ColumnName).Select((x1, x2) => new{count = SqlFunc.AggregateSum(SqlFunc.IIF(x2.Id > 0, 1, 0)), //null的数据要为0所以不能用countdate = x1.ColumnName.ToString("yyyy-MM")}).ToList().OrderBy(c => c.date).ToList();var queryableLeft1 = resultlist.Sum(c => c.count);int years1Count = db.Queryable<Operateinfo>().Count(c =>(c.Operate_time.Year == 2022 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2021 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2020 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2019 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2018 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2017 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2016 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2015 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2014 && c.Operate_time.Month == 1)|| (c.Operate_time.Year == 2013 && c.Operate_time.Month == 1));
}