<select id="getAppletBWareOrderByDepotId" resultType="com.ellassay.x2.sync.entity.X2DRetailEntity"> select ${selectField} from X6_BILLS_GLS.D_RETAIL where setdepot_id in <foreach collection="allDepotId" item="ids" open="(" separator="," close=")"> #{ids} </foreach> and setdepot...
selectList(queryWrapper); list.forEach(System.out::println); } @Test public void test4() { /* UPDATE t_user SET user_name=?,email=? WHERE user_name LIKE ? AND (age > ? OR email IS NULL) */ LambdaUpdateWrapper<User> updateWrapper = new LambdaUpdateWrapper<>(); updateWrapper.like...
</select> 与多条件查询不同的是,SQL语句中只会有一个分支生效 当用户一个条件都不选时,可以在<otherwise>中写上1=1让语法成立,反之,若选择了条件则会返回正常结果 3.foreach 对于批量删除的场景,传统的方法是通过in关键字结合占位符来确定,就像这样 where id in (?,?,?) 但对于动态的场景,批量的数量永...
@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor(){ MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.H2)); return interceptor;} 接下来改造上面的代码，调用selectJoinPage()方法：public void page() { ...
mybatis plus foreach 的用法 一: foreach 用于 select * from tablename where colname in (A,B,C……); 1:service 层: Set<String> teacherNums = new HashSet<>(); Set<String> departments = new HashSet<>(); list.stream().forEach(s->{...
case when + forEach 实现多条件多值批量更新 1、单个条件 update mydata_table when id=#{item.id} then #{item.status} where id in #{item.id,jdbcType=BIGINT} 1. 2、多个条件 update demo_table status= when field2=#{item.field2} and company_id=#{item.field3} then #{item.status} crea...
简介:Mybatis-Plus select不去查全部字段和去重 1mybatis-plus select查询语句默认是查全部字段,有两种方法可以指定要查询的字段 CREATE TABLE `user` (`id` bigint(20) NOT NULL COMMENT '主键',`name` varchar(30) DEFAULT NULL COMMENT '姓名',`age` int(11) DEFAULT NULL COMMENT '年龄',`email` varc...
wrapper.select("age, count(age) as count") .groupBy("age"); List<User> list = mapper.selectList(wrapper); list.forEach(System.out::println); list.forEach(x -> { System.out.println(x.getId()); }); return "success"; } # 控制台 SELECT age, count(age) as count FROM user GROUP...
public void testSelectByBatchIds(){ Listusers = userMapper.selectBatchIds(Arrays.asList(1, 2, 3)); users.forEach(System.out::println); } 测试结果如下: 使用map进行条件查询测试代码如下: //按条件查询之使用map操作 @Test public void testSelectByMap(){ ...
@Configurationpublic class MybatisPlusConfiguration { //配置分页拦截器 @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); }} 二、单表查询分页-表格分页 @Testpublic void testSelect() { LambdaQueryWrapper<User> query = new LambdaQueryWrapper<>(...