叩丁狼java学习第十天-mybatis多表查询

1.讲义

2.注意事项

association中的select需要写对。

<resultMap id="employeeMap" type="Employee">
        <id property="id" column="id" />
        <result property="employeeName" column="employee_name"/>
        <association select="mapper.DepartmentMapper.selectDepartment"
                     property="department"
                     column="department_id"
                     javaType="Department"/>
    </resultMap>

开启驼峰命名

<configuration>  
    <settings>  
        <setting name="mapUnderscoreToCamelCase" value="true" />  
    </settings>  
</configuration>