mybaits十三:使用collection分布查询

 DepartmentMapper.xml的sql配置文件

<resultMap type="com.atChina.bean.Department" id="defineDeptStep">
  	<id column="deptno" property="deptno"/>
  	<result column="dname" property="dname"/>
  	<result column="loc" property="loc"/>
  	<collection property="emps" 
  		select="com.atChina.dao.EmployeePlusMapper.getEmpsByDep"
  		column="{deptno}">
  	</collection>
  </resultMap>
  <select id="getDepartByDeptnoStep" resultMap="defineDeptStep">
  	select * from depttest a where a.deptno = #{deptno}
  </select>

EmployeePlusMapper.xml的sql配置文件

<select id="getEmpsByDep" resultType="com.atChina.bean.Employee">
		select *
		 from emptest a where a.deptno = #{deptno}
	</select>

参数传递多列

如果将多列的值传递过去,可以将多列的值封装map传递

              column="{key1=column1, key2=column2}"