web-form
查询数据库 ，从配置文件中读取字符信息 查询
// 从配置文件中读取数据 string sqlstr = // 获取数据库连接字符串ConfigurationManager.ConnectionStrings["staffConnectionString2"].ConnectionString;DataTable dt = new DataTable(); // 存储数据using (SqlConnection conn = new SqlConnection(sqlstr)) // 连接数据库{conn.Open(); // 打开数据库using (SqlCommand cmd = conn.CreateCommand()) //sql 执行性句柄{cmd.CommandText = "select * from tb_dept"; // 添加sql语句SqlDataAdapter adapter = new SqlDataAdapter(cmd); // 执行句柄adapter.Fill(dt); // 添加到表里面}}
查询数据库，直接写字符串来连接 查询
string connectionString = "Data Source=MOGFPLQEEJOTGON\\SQLEXPRESS;Initial Catalog=staff;Integrated Security=True"; // 直接写sql语句// 原来少了一个分号// 表的名字弄错了string selectDate = "select * from tb_emp where dept_id = @nodeValue";using (SqlConnection conn = new SqlConnection(connectionString)) // 连接数据库{using (SqlCommand cmd = new SqlCommand(selectDate, conn)) // 执行sql语句{// 没有查到数据就是空的 cmd.Parameters.AddWithValue("@nodeValue", nodeValue);// 添加参数SqlDataAdapter adapter = new SqlDataAdapter(cmd); // 查询数据将添加到数据表中adapter.Fill(dt);}}
// 导致响应不生效了 重定向//Response.Redirect("WebForm1.aspx");// 转发保留之前的参数 转发Server.Transfer("WebForm1.aspx");
数据库 修改
// 这还要转义一下不然后不去
string connectionString = "Data Source=MOGFPLQEEJOTGON\\SQLEXPRESS;Initial Catalog=staff;Integrated Security=True ";
// 这样就可以解决这个问题了，只要能获取到这个参数就好
string param1 = Session["id"].ToString().Trim();
int params_id = Convert.ToInt32(param1);
// 原来少了一个分号
string updateQuery = "update tb_emp set e_name = @name,dept_id= @dept_id,position = @position,phone= @phone,address= @address,emp_code= @emp_code where id = @params_id"; // using (SqlConnection conn = new SqlConnection(connectionString)){using (SqlCommand cmd = new SqlCommand(updateQuery, conn)){cmd.Parameters.AddWithValue("@name", name.Text.Trim());cmd.Parameters.AddWithValue("@dept_id", dept_id.Text.Trim());cmd.Parameters.AddWithValue("@phone", phone.Text.Trim());cmd.Parameters.AddWithValue("@position", position.Text.Trim());cmd.Parameters.AddWithValue("@address", address.Text.Trim());cmd.Parameters.AddWithValue("@emp_code", emp_code.Text.Trim());conn.Open();int rowsAffected = cmd.ExecuteNonQuery();if (rowsAffected > 0){// 数据添加成功 重定向是服务器发送过来，没有数据了，页面不是第一次加载呢，那就没有绑定数据源// 导致响应不生效了，//Response.Redirect("WebForm1.aspx");// 转发保留之前的参数Server.Transfer("WebForm1.aspx");}else{// 数据添加失败Response.StatusCode = 403;}}}
删除 数据库
// 这还要转义一下不然后不去string connectionString = "Data Source=MOGFPLQEEJOTGON\\SQLEXPRESS;Initial Catalog=staff;Integrated Security=True";// 原来少了一个分号// 表的名字弄错了string deteleQuery = "delete from tb_emp where id = @id";
int id = Convert.ToInt32(Session["id"].ToString().Trim());
using (SqlConnection conn = new SqlConnection(connectionString)){using (SqlCommand cmd = new SqlCommand(deteleQuery, conn)){cmd.Parameters.AddWithValue("@id",id );conn.Open();// 执行成功就返回非一的数，int rowsAffected = cmd.ExecuteNonQuery();if (rowsAffected > 0){// 删除添加成功Response.Redirect("WebForm1.aspx");}else{// 数据添加失败Response.StatusCode = 403;}}}
添加 数据库
// 这还要转义一下不然后不去string connectionString = "Data Source=MOGFPLQEEJOTGON\\SQLEXPRESS;Initial Catalog=staff;Integrated Security=True";string insertQuery = "INSERT INTO tb_emp (e_name,dept_id,position,phone,address,emp_code)" +"VALUES (@name,@dept_id,@position,@phone,@address,@emp_code)";using (SqlConnection conn = new SqlConnection(connectionString)){using (SqlCommand cmd = new SqlCommand(insertQuery, conn)){cmd.Parameters.AddWithValue("@name", name.Text.Trim());cmd.Parameters.AddWithValue("@dept_id", dept_id.Text.Trim());cmd.Parameters.AddWithValue("@phone", phone.Text.Trim());cmd.Parameters.AddWithValue("@position", position.Text.Trim());cmd.Parameters.AddWithValue("@address", address.Text.Trim());cmd.Parameters.AddWithValue("@emp_code", emp_code.Text.Trim());conn.Open();int rowsAffected = cmd.ExecuteNonQuery();if (rowsAffected > 0){// 数据添加成功Response.Redirect("WebForm1.aspx");}else{// 数据添加失败Response.StatusCode = 403;}}}
