mybatis使用全注解的方式案例（包含一对多关系映射）

前面我写过ssh：ssh(Spring+Spring mvc+hibernate)简单增删改查案例和ssm：ssm(Spring+Spring mvc+mybatis)的案例，需要了解的可以去看看，今天我写了一下ssm(spring+springmvc+mybatis)全注解的方式又重新写了一遍两表增删改查的案例，其中别的地方都一样，就是有几个文件不一样，
1.其中:
mybatis-config.xml中：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings><!-- 打印查询语句 --><setting name="logImpl" value="STDOUT_LOGGING" />
</settings>
<typeAliases><typeAlias alias="Emp" type="org.entity.Emp"/><typeAlias alias="Dept" type="org.entity.Dept"/>
</typeAliases><mappers><mapper class="org.dao.IEmpMapper"/><mapper class="org.dao.IDeptMapper"/></mappers>
</configuration>

注意看，，mapper后面是class,不是resource,一定要注意
2.还有：我们不需要EmpMapper.xml和DeptMapper.xml文件，直接删掉就可以了
3.修改我们的IEmpMapper接口为：

package org.dao;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.entity.Emp;public interface IEmpMapper {//根据编号删除.@Delete("delete from emp where eid = #{eid} ")int deleteByPrimaryKey(Integer eid);//添加@Insert("insert into emp (eid, ename, eage,  edate, did) " +"values (#{eid,jdbcType=INTEGER}," +" #{ename,jdbcType=VARCHAR}, " +"#{eage,jdbcType=INTEGER},  " +"#{edate,jdbcType=TIMESTAMP}," +" #{did,jdbcType=INTEGER})")int insert(Emp record);//根据编号查询@Select("select * from emp where eid = #{eid}")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="dept",column="did",javaType=org.entity.Dept.class,one=@One(select="org.dao.IDeptMapper.selectByPrimaryKey"))})Emp selectByPrimaryKey(Integer eid);//修改@Update("pdate emp " +" set ename = #{ename,jdbcType=VARCHAR}, " +" eage = #{eage,jdbcType=INTEGER}, " +" edate = #{edate,jdbcType=TIMESTAMP}, " +"  did = #{did,jdbcType=INTEGER} " +"where eid = #{eid,jdbcType=INTEGER}")int updateByPrimaryKey(Emp record);//查询全部@Select("select * from emp")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="dept",column="did",javaType=org.entity.Dept.class,one=@One(select="org.dao.IDeptMapper.selectByPrimaryKey"))})List<Emp> findEmpAll();//根据部门编号查询员工信息@Select("select * from emp where did = #{dids}")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="dept",column="did",javaType=org.entity.Dept.class,one=@One(select="org.dao.IDeptMapper.selectByPrimaryKey"))})List<Emp> findEmpByDept(int did);}

4.修改我们的IDeptMapper接口为：

package org.dao;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.entity.Dept;public interface IDeptMapper {@Delete("delete from dept where id = #{id}")int deleteByPrimaryKey(Integer id);@Insert("insert into dept (id, name, loc )" +" values (#{id,jdbcType=INTEGER}, " +"#{name,jdbcType=VARCHAR}, " +"#{loc,jdbcType=VARCHAR})")int insert(Dept record);@Select("select * from dept where id  = #{id}")@Results({@Result(id=true,property="id",column="id"),@Result(property="name",column="name"),@Result(property="loc",column="loc"),@Result(property="empList",column="id",javaType=List.class,many=@Many(select="org.dao.IEmpMapper.findEmpByDept"))})Dept selectByPrimaryKey(Integer id);@Update("update dept " +"set name = #{name,jdbcType=VARCHAR}, " +" loc = #{loc,jdbcType=VARCHAR} " +"where id = #{id,jdbcType=INTEGER}")int updateByPrimaryKey(Dept record);@Select("select * from dept")List<Dept> findDeptAll();
}

然后就可以正常的主外键关联，包括查询显示，如图：
显示员工信息

需要注意的是主外键映射，我总结了以下的方法，大家可以进行看一下：

一：
@Select("select * from dept where id  = #{id}")@Results({@Result(id=true,property="id",column="id"),@Result(property="name",column="name"),@Result(property="loc",column="loc"),@Result(property="实体类里面的属性",column="id",javaType=List.class,many=@Many(select="多方的接口.根据一方的编号查询多方的集合"))})Dept selectByPrimaryKey(Integer id);多：//根据编号查询@Select("select * from emp where eid = #{eid}")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="实体中的对象",column="外键列",javaType=一方类.class,one=@One(select="一方接口.根据一方编号查询信息"))})Emp selectByPrimaryKey(Integer eid);//查询全部@Select("select * from emp")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="实体中的对象",column="外键列",javaType=一方类.class,one=@One(select="一方接口.根据一方编号查询信息"))})List<Emp> findEmpAll();//根据部门编号查询员工信息@Select("select * from emp where did = #{dids}")@Results({@Result(id=true,property="eid",column="eid"),@Result(property="ename",column="ename"),@Result(property="eage",column="eage"),@Result(property="实体中的对象",column="外键列",javaType=一方类.class,one=@One(select="一方接口.根据一方编号查询信息"))})List<Emp> findEmpByDept(int did);

按照这个方法配置保证阿弥陀佛了！！！
下面就是源码：
控制器：
DeptController
EmpController
Dao层：
IDeptMapper
IEmpMapper
DaoImpl层：
DeptMapperImpl
EmpMapperImpl
实体类层：
Dept
Emp
Service层：
IDeptService
IEmpService
ServiceImpl层：
DeptServiceImpl
EmpServiceImpl
配置文件：
applicationContext-servlet.xml
applicationContext.xml
mybatis-config.xml
web.xml
前台页面：
index.jsp
saveDept.jsp
saveEmp.jsp
showDept.jsp
showEmp.jsp
updateDept.jsp
updateEmp.jsp