**MyBatis动态sql详解(foreach语句详解)** 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 理论基础: 一、介绍: foreach主要是用于一个循环,大部分用到的是循环的生成sql,下面说一下动态foreach的属性: foreach元素的属性主要有item,index,collection,open,separator,
<foreach collection="listQuery" item="query" separator="or"> (user_info_id = #{query.uid} AND introduced_user_info_id =#{query.introduceUid}) </foreach> </update> 1. 2. 3. 4. 5. 6. 其中item=query即为list中的每个dto即为query,那么 #{query.uid}即为获取dto中的uid。 /** * ...
<foreach collection="array" item="id" index="index" open="(" close=")" separator=","> #{id} </foreach> </delete> 若假如传入的参数是一个数组 int[] ids = {1,2,3,4,5},那么打印之后的SQL如下: delete form user where id in (1,2,3,4,5) 由这个例子,我们可以看到: 当传入的是...
Then, for each [project id] now in reporting_table, I need to calculate the value of the [total_cost numeric(18,2)] field in order to update it in the reporting_table: Run though the [orders] table (a master table), WHEN [project id] = [project id of current iteration],@totalCo...
配置文件SQL: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select*from person where1=1<iftest="ids != null and ids != ''">and idin${ids}</if> 执行main 方法: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 @Testpublicvoidtest_3...
在mybatis中使用<foreach>标签时, 如果传入的列表为空, 则解析为sql语句时<foreach>标签所在位置会被解析为空, 最终的sql呈现为in ()或者in后面的内容为空, 从而导致sql语法错误。 网上找了很多种方法,如果用到foreach的地方比较多,用拦截器来处理可能会更好。
--根据创建人和课程组件id进行批量查询 -->SELECT *FROM tar_course_content_infoWhEREis_delete=0and(created_by, course_assembly_id)in<foreach collection="list" item="item" open="(" close=")" separator="," nullable="false">(#{item.createdBy},#{item.courseAssemblyId})</foreach> 执行结果 ...
sql实现 代码语言:javascript 代码运行次数:0 运行 AI代码解释 <!--queryvo中的id集合实现查询用户列表--> select * from user <where> <if test="ids != null and ids.size()>0"> <foreach collection="ids" open="and id in (" close=")" item="uid" separator=","> #{uid} </foreach...
The error occurred while executing a query Cause: com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: Failed to process, please exclude the tableName or statementId. Error SQL: select notice.status,col.* from inv_notice_wo_col col ...
Of course don't combine ALL of them, if the amount is HUGE. Say you have 1000 rows you need to insert, then don't do it one at a time. You shouldn't equally try to have all 1000 rows in a single query. Instead break it into smaller sizes. ...