sql数据库查询语句大全 sql批量查询多条数据

mybatis的批量更新操作

我们知道mybatis的插入和删除是可以支持批量操作的，但是update也是支持的，代码如下：

<update id="updateAll" parameterType="java.util.List">
    <foreach collection="list" item="it" index="index" open=" close=" separator=";">
      update SYSTEM_EXPERT_LIBRARY
      SET USER_CODE = #{it.userCode,jdbcType=VARCHAR},
      EXPERT_NAME = #{it.expertName,jdbcType=VARCHAR},
      EXPERT_SEX = #{it.expertSex,jdbcType=CHAR},
      EXPERT_MAIL = #{it.expertMail,jdbcType=VARCHAR},
      EXPERT_ADDRESS = #{it.expertAddress,jdbcType=VARCHAR},
      EXPERT_CARD = #{it.expertCard,jdbcType=VARCHAR},
      EXPERT_PHONE = #{it.expertPhone,jdbcType=VARCHAR},
      EXPERT_XILIE = #{it.expertXilie,jdbcType=VARCHAR},
      SPECIALTY = #{it.specialty,jdbcType=VARCHAR},
      STATUS = #{it.status,jdbcType=VARCHAR},
      UPDATER = #{it.updater,jdbcType=VARCHAR}
      where ID = #{it.id,jdbcType=INTEGER}
    </foreach>
  </update>

注意批量更新的时候，如果使用了druid数据源，则配置的时候要注意：不能配置wall拦截器，否则批量更新不成功。

<bean id="dataSource">

还有重要的一点是要默认开启支持批量修改操作

Url拼接#allowMultiQueries=true

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://:3306/xx#allowMultiQueries=true
jdbc.username=
jdbc.password=

mybatis的批量新增删除

<delete id="deleteBatch">
  delete from t_acl where id in
  <foreach collection="list" index="index" item="item" 
		separator="," open="(" close=")">
    #{item.id}
  </foreach</delete>

<insert id="insertAll" parameterType="java.util.List" 
	useGeneratedKeys="false">  
  insert into SYSTEM_EXPERT_LIBRARY  
  <foreach collection="list" item="it" index="index" separator=",">
  (  )  
	</foreach>
</insert>