mybatis

转自：http://blog.csdn.net/l18270919464/article/details/53116606

Mapper接口:

public int update(Admin admin);

public Admin selectByUserName(String account);

public List<Admin> list();

public int add(Admin admin);

public int delete(String id);

public Set<String> getRoleIds(String adminId);

public void deleteRole(Map<String,Object> map);

public List<Role> getRoles(@Param("set") Set<String> roleIds);

public void addRole(List<AdminRole> addRoleList);

public void deleteRoles(@Param("adminId")String adminId, @Param("deleteList")List<String> deleteRoles);

public List<Function> list(PageVo pageVo)

Mapper.xml:

<?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

item 
循环体中的具体对象。支持属性的点路径访问，如item.age,item.info.details。 具体说明：在list和数组中是其中的对象，在map中是value。 该参数为必选。

collection 
要做foreach的对象，作为入参时，List