插入数据并返回主键
<!--
添加操作
默认返回的饿是受影响的行数，可以设置返回主键（自动增长）
useGeneratedKeys:取值范围是true或false，表示会获取主键，并赋值到keyProperty属性设置的模型属性（JavaBean实体类中的属性字段）
keyProperty:设置返回值将赋值给数据属性的哪个属性字段
keyColumn:设置数据库自动生动的朱主键名
返回的主键会自动设置到实体类中对应的id属性字段中
-->
<insert id="insertSelective" parameterType="com.xxxx.crm.vo.User" useGeneratedKeys="true" keyProperty="id" keyColumn="id" >
insert into t_user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="userName != null" >
user_name,
</if>
<if test="userPwd != null" >
user_pwd,
</if>
<if test="trueName != null" >
true_name,
</if>
<if test="email != null" >
email,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="userName != null" >
#{userName,jdbcType=VARCHAR},
</if>
<if test="userPwd != null" >
#{userPwd,jdbcType=VARCHAR},
</if>
<if test="trueName != null" >
#{trueName,jdbcType=VARCHAR},
</if>
<if test="email != null" >
#{email,jdbcType=VARCHAR},
</if>
</trim>
</insert>
多条件查询
<select id="selectByParams" parameterType="com.xxxx.crm.query.UserQuery" resultType="com.xxxx.crm.vo.User">
select
<include refid="Base_Column_List"></include>
from
t_user
<where>
is_valid = 1
<!-- 用户名查询 -->
<if test="null != userName and userName != ''">
and user_name like concat('%',#{userName},'%')
</if>
<!-- 邮箱查询 -->
<if test="null != email and email != ''">
and email like concat('%',#{email},'%')
</if>
<!-- 手机号查询 -->
<if test="null != phone and phone != ''">
and phone like concat('%',#{phone},'%')
</if>
</where>
</select>
遍历id逻辑删除
<update id="deleteBatch">
update
t_user
set
is_valid = 0
where
id
in
<foreach collection="array" item="id" open="(" close=")" separator=",">
#{id}
</foreach>
</update>
条件更新
<update id="updateByPrimaryKeySelective" parameterType="com.xxxx.crm.vo.User" >
update t_user
<set >
<if test="userName != null" >
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="userPwd != null" >
user_pwd = #{userPwd,jdbcType=VARCHAR},
</if>
<if test="trueName != null" >
true_name = #{trueName,jdbcType=VARCHAR},
</if>
<if test="email != null" >
email = #{email,jdbcType=VARCHAR},
</if>
<if test="phone != null" >
phone = #{phone,jdbcType=VARCHAR},
</if>
<if test="isValid != null" >
is_valid = #{isValid,jdbcType=INTEGER},
</if>
<if test="createDate != null" >
create_date = #{createDate,jdbcType=TIMESTAMP},
</if>
<if test="updateDate != null" >
update_date = #{updateDate,jdbcType=TIMESTAMP},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
批量添加
<insert id="insertBatch">
insert into
t_user_role (user_id,role_id,create_date,update_date)
values
<foreach collection="list" item="item" separator=",">
(#{item.userId},#{item.roleId},now(),now())
</foreach>
</insert>
批量更新
第一种：
case when虽然最后只会有一条更新语句，但是xml中的循环体有点多，每一个case when 都要循环一遍list集合，所以大批量拼sql的时候会比较慢，所以效率问题严重。使用的时候建议分批插入。
<!-- 批量更新第一种方法，通过 case when语句变相的进行批量更新 -->
<update id="updateBatch" parameterType="list">
update roughnes
<trim prefix="set" suffixOverrides=",">
<trim prefix="p1_roughness =case" suffix="end,">
<foreach collection="list" item="i" index="index">
<if test="i.p1Roughness != null and i.p1Roughness !=''">
when id = #{i.id} then #{i.p1Roughness}
</if>
</foreach>
</trim>
<trim prefix="p2_roughness =case" suffix="end,">
<foreach collection="list" item="i">
<if test="i.p2Roughness != null and i.p2Roughness != ''">
when id = #{i.id} then #{i.p2Roughness}
</if>
</foreach>
</trim>
<trim prefix="p3_roughness =case" suffix="end,">
<foreach collection="list" item="i">
<if test="i.p3Roughness != null and i.p3Roughness != ''">
when id = #{i.id} then #{i.p3Roughness}
</if>
</foreach>
</trim>
<trim prefix="p4_roughness =case" suffix="end,">
<foreach collection="list" item="i">
<if test="i.p4Roughness != null and i.p4Roughness != ''">
when id = #{i.id} then #{i.p4Roughness}
</if>
</foreach>
</trim>
<trim prefix="p5_roughness =case" suffix="end,">
<foreach collection="list" item="i">
<if test="i.p5Roughness != null and i.p5Roughness != ''">
when id = #{i.id} then #{i.p5Roughness}
</if>
</foreach>
</trim>
<trim prefix="average_roughne =case" suffix="end,">
<foreach collection="list" item="i">
<if test="i.averageRoughne != null and i.averageRoughne != ''">
when id = #{i.id} then #{i.averageRoughne}
</if>
</foreach>
</trim>
</trim>
where id in
<foreach collection="list" item="i" separator="," open="(" close=")">
#{i.id}
</foreach>
</update>
第二种：
sql语句for循环效率其实相当高的，因为它仅仅有一个循环体，只不过最后update语句比较多，量大了就有可能造成sql阻塞。
<!-- 批量更新第二种方法，通过接收传进来的参数list进行循环着组装sql -->
<update id="updateBatch" parameterType="java.util.List" >
<foreach collection="list" item="item" index="index" open="" close="" separator=";">
update standard_relation
<set >
<if test="item.standardFromUuid != null" >
standard_from_uuid = #{item.standardFromUuid,jdbcType=VARCHAR},
</if>
<if test="item.standardToUuid != null" >
standard_to_uuid = #{item.standardToUuid,jdbcType=VARCHAR},
</if>
<if test="item.gmtModified != null" >
gmt_modified = #{item.gmtModified,jdbcType=TIMESTAMP},
</if>
</set>
where id = #{item.id,jdbcType=BIGINT}
</foreach>
</update>
第三种：
duplicate key update可以看出来是最快的，但是一般大公司都禁用，公司一般都禁止使用replace into和INSERT INTO … ON DUPLICATE KEY UPDATE，这种sql有可能会造成数据丢失和主从上表的自增id值不一致。而且用这个更新时，记得一定要加上id，而且values（）括号里面放的是数据库字段，不是java对象的属性字段。
<!-- 批量更新第三种方法，用ON DUPLICATE KEY UPDATE-->
<insert id="updateBatch">
insert into followme_parameters
(id,account,chart_id,signal_source,rate)
values
<foreach collection="list" separator="," index="index" item="item">
(#{item.id},#{item.account},#{item.chartId},#{item.signalSource},#{item.rate})
</foreach>
ON duplicate KEY UPDATE
id=VALUES(id),signal_source=values(signal_source),rate=values(rate)
</insert>