<?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">
<!-- namespace 標識唯一的映射 -->
<!-- user爲model.User的別名，其中別名的定義在sqlMapConfig中定義的,命名空間model.User不能用別名代替 -->
<mapper namespace="model.User">
<!-- id:sql語句的唯一標識 parameterType：傳入數據的參數類型 resultType：
返回值得數據類型 #{id}：接收參數的語法，如果是一個參數，參數名任意 -->
<resultMap type="model.User" id="baseResultMap">
<id column="user_id" property="userId" />
<result column="user_name" property="userName" />
<result column="birthday" property="birthday" />
<result column="user_addr" property="userAddr" />
</resultMap>
<select id="selectUserById" parameterType="java.lang.Integer"
resultType="model.User">
select * from user t where t.user_id = #{id}
</select>
<select id="selectUserById1" parameterType="java.lang.Integer"
resultMap="baseResultMap">
select * from user t where t.user_id = #{id}
</select>
<select id="selectUserCount" parameterType="java.lang.Integer"
resultType="java.lang.Integer">
select count(*) from user
</select>
<!--resultType:返回系統定義的數據類型時使用 resultMap:返回自定義實體類型使用 -->
<select id="selectUserByIdWithMap" parameterType="java.lang.Integer"
resultType="java.util.Map">
select * from user t where t.user_id = #{id}
</select>
<select id="selectUserAll" resultMap="baseResultMap">
select * from user
</select>
<!-- 多個參數查詢，使用map方式#{userName}，userName爲Map中的key，parameterType要設置成 java.util.Map -->
<select id="selectUserById2" parameterType="java.util.Map"
resultMap="baseResultMap">
select * from user t where t.user_name=#{userName} and
t.user_addr=#{userAddr}
</select>
<select id="selectUserById3" parameterType="model.Condition"
resultMap="baseResultMap">
select * from user t where t.user_name=#{userName} and
t.user_addr=#{userAddr}
</select>
<select id="selectUserByLike" parameterType="java.util.Map"
resultMap="baseResultMap">
select *from user t where t.user_name like '%${userName}%'
</select>
<!-- 容易有輸入輸出問題 -->
<select id="selectUserByIn" parameterType="java.util.Map" resultMap="baseResultMap">
select *from user t where t.user_id in ${ids}
</select>
<!-- (1,2,3)
collection:集合，用於接收map中的集合，ids必須是map中的key
open：以某種字符開始
close：以某種字符結束
item：循環的每一項
separator：用什麼來分割
-->
<select id="selectUserByInWithForEach" resultMap="baseResultMap">
select *from user t where t.user_id in
<foreach collection="ids" open="(" close=")" item="id" separator=",">
#{id}
</foreach>
</select>
<insert id="insert" parameterType="model.User" >
<!-- keyProperty:實體類裏的主鍵 order：是主鍵生成的順序，在MySQL中是AFTER resultType:是主鍵在實體類中的類型
生成主鍵的sql：在MySQL中select LAST_INSERT_ID() -->
<selectKey keyProperty="userId" order="AFTER" resultType="int">
select LAST_INSERT_ID()
</selectKey>
insert into user(user_id,user_name,birthday,user_addr)
value (#{userId},#{userName},#{birthday},#{userAddr})
</insert>
<update id="update" parameterType="model.User">
update user t set t.user_name=#{userName},
t.birthday=#{birthday},
t.user_addr=#{userAddr}
where t.user_id=#{userId}
</update>
<!-- delete在MySQL中不支持別名 -->
<delete id="deleteUserById" parameterType="java.lang.Integer">
delete from user where user_id=#{userId}
</delete>
<!-- 注意，引用上面的baseResultMap 是resultMap類型而不是resultType類型 -->
<select id="selectUserIdByCondition" parameterType="java.util.Map" resultMap="baseResultMap">
select * from user t
<where>
<if test ="userName!=null">
t.user_name like '%${userName}%'
</if>
<if test="birthday !=null">
<![CDATA[
and t.birthday< #{birthday}
]]>
</if>
<if test="userAddr!=null">
and t.user_addr like '%${userAddr}%'
</if>
</where>
</select>
<!-- 動態更新 <set>可以自動處理最後一個人逗號 -->
<update id="dynamicUpdate" parameterType="user">
update user t
<set>
<if test="userName!=null">
t.user_name=#{userName},
</if>
<if test="userAddr!=null">
t.user_addr=#{userAddr},
</if>
<if test="birthday!=null">
t.birthday=#{birthday}
</if>
where t.user_id=#{userId}
</set>
</update>
</mapper>