后端-框架-MyBatis-动态SQL-foreach

后端-框架-MyBatis-动态SQL-foreach

public interface UserMapper {
	public List<User> getUserListByRoleIdForeachArray(Integer[] roleIds);
	public List<User> getUserListByRoleIdForeachList(List<Integer> roleList);
	public List<User> getUserListByRoleIdForeachExample(@Param("example")Integer[] roleIds);
}

对于foreach中collection属性为array,即数组

<select id="getUserListByRoleIdForeachArray" resultMap="getUserListByRoleIdForeach">
	select * from smbms_user where userRole in
		<foreach collection="array" item="roleId" open="(" separator="," close=")">
			#{roleId}
		</foreach>
</select>

对于foreach中collection属性为list

<select id="getUserListByRoleIdForeachList" resultMap="getUserListByRoleIdForeach">
	select * from smbms_user where userRole in
		<foreach collection="list" item="roleList" open="(" separator="," close=")">
			#{roleList}
		</foreach>
</select>

接口中起别名对应foreach中collection属性

<select id="getUserListByRoleIdForeachExample" resultMap="getUserListByRoleIdForeach">
	select * from smbms_user where userRole in
		<foreach collection="example" item="roleId" open="(" separator="," close=")">
			#{roleId}
		</foreach>
</select>

Map多参数入参,foreach中collection属性对应相应别名

<select id="getUserListByRoleIdMap" resultMap="getUserListByRoleIdMap">
		select * from smbms_user where gender = #{gender}
			and userRole in
			<foreach collection="roleIds" item="roleId" open="(" separator="," close=")">
				#{roleId}
			</foreach>
	</select>