<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.young.shop.dao.mapper.AdminMapper">
<!--设置domain类和数据库中表的字段一一对应，注意数据库字段和domain类中的字段名称不致，此处一定要！ -->
<resultMap id="BaseResultMap" type="com.young.shop.vo.Admin">
<id column="id" property="id" jdbcType="VARCHAR" />
<result column="username" property="username" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="email" property="email" jdbcType="VARCHAR" />
</resultMap>
<resultMap id="AdminRoleResultMap" type="com.young.shop.vo.AdminRole">
<id column="id" property="id" jdbcType="VARCHAR" />
<result column="role_id" property="roleId" jdbcType="VARCHAR" />
<result column="admin_id" property="adminId" jdbcType="VARCHAR" />
</resultMap>
<resultMap id="RoleResultMap" type="com.young.shop.vo.Role">
<id column="id" property="id" jdbcType="VARCHAR" />
<result column="name" property="name" jdbcType="VARCHAR" />
</resultMap>
<!-- 查询单条记录 -->
<select id="selectByUserName" parameterType="String" resultMap="BaseResultMap">
SELECT * FROM t_admin WHERE username = #{username}
</select>
<!-- 查询所有记录 -->
<select id="list" resultMap="BaseResultMap">
SELECT * FROM t_admin
</select>
<!--修改记录 -->
<update id="update" parameterType="com.young.shop.vo.Admin">
update t_admin
<set>
<if test=" username != null ">
username = #{username,jdbcType=VARCHAR},
</if>
<if test=" password != null ">
password = #{password,jdbcType=VARCHAR},
</if>
<if test=" email != null ">
email = #{email,jdbcType=VARCHAR}
</if>
</set>
where id = #{id,jdbcType=VARCHAR}
</update>
<!--添加记录 -->
<insert id="add" parameterType="com.young.shop.vo.Admin">
<selectKey keyProperty="id" resultType="java.lang.String"
order="BEFORE">
select replace(uuid(),'-','') from dual
</selectKey>
insert into t_admin (id,username,password,email) values
(#{id},#{username},#{password},#{email})
</insert>
<delete id="delete">
delete from t_admin where id=#{id}
</delete>
<select id="getRoleIds" resultMap="AdminRoleResultMap">
select * from t_admin_role
where admin_id = #{adminId}
</select>
<select id="getRoles" resultMap="RoleResultMap" parameterType="java.util.Set">
select * from t_role where id in
<foreach collection="set" index="index" item="item" open="("
separator="," close=")">
#{item.roleId}
</foreach>
</select>
<!-- 批量删除 使用map-->
<delete id="deleteRole" parameterType="map">
delete from t_admin_role where admin_id = #{adminId} and role_id in
<foreach collection="deleteRoles" index="index" item="item"
open="(" separator="," close=")">
#{item.roleId}
</foreach>
</delete>
<!-- 批量插入 -->
<insert id="addRole">
insert into t_admin_role (id,role_id,admin_id) values
<foreach collection="list" index="index" item="item"
separator=",">
(#{item.id},#{item.roleId},#{item.adminId})
</foreach>
</insert>
<!-- 批量删除 使用list-->
<delete id="deleteRoles">
delete from t_admin_role where admin_id = #{adminId} and role_id in
<foreach collection="deleteList" index="index" item="item"
open="(" separator="," close=")">
#{item}
</foreach>
</delete>

<!-- 查询所有记录 -->
 <select id="list" parameterType="com.cn21.shop.vo.PageVo"
  resultMap="BaseResultMap">
  SELECT * FROM t_function
  <if test=" page != null and size != null">
   limit #{page},#{size}
  </if>
 </select>
</mapper>

加黑部分为需注意的地方以及分页查询和自动生成uuid主键

 具体可以学习一下MyBatis的动态SQL详解