select 列计算 示例1: java QueryWrapper query = new QueryWrapper() .select(ACCOUNT.ID.add(100).as("x100")) .from(ACCOUNT); String sql = query.toSQL(); 列计算的 加减乘除 对应的方法分别为:add / subtract / multiply / divide 其查询生成的 Sql 如下: ...
new MPJQueryWrapper<Order>() .selectAll(Order.class) .select("t2.unit_price","t2.name as product_name") .select("t1.name as user_name") .leftJoin("t_user t1 on t1.id = t.user_id") .leftJoin("t_product t2 on t2.id = t.product_id") .eq(...
在MyBatis中,QueryWrapper是一个非常实用的工具类,它允许我们以编程的方式构建动态SQL查询语句,而无需手动编写复杂的SQL。select方法是QueryWrapper中用于指定查询字段的方法之一。下面我将分点详细介绍QueryWrapper的select方法的使用: 1. QueryWrapper的基本概念 QueryWrapper是MyBatis-Plus提供的一个用于构建查询条件的工具类...
*/@TestpublicvoidselectByQueryWrapper4(){ QueryWrapper<Employee> queryWrapper=newQueryWrapper();// QueryWrapper<Employee> queryWrapper2=Wrappers.<Employee>query();queryWrapper.likeRight("name","李").or(wq->wq.isNotNull("email").eq("gender","女")); List<Employee> employeeList = employeeMapper....
class, new MPJQueryWrapper<Order>() .selectAll(Order.class) .select("t2.unit_pric...
(` age `) AS ` avgAge `* FROM* ` tb_account `*/}@TestpublicvoidtestSqlFunction2(){QueryWrapperwrapper=QueryWrapper.create().select(concat(ACCOUNT.USER_NAME, string("ly"))).from(ACCOUNT).where(not(ACCOUNT.AGE.eq(3)));printSql(wrapper);/*** SELECT* CONCAT(` user_name `, 'ly')...
publicinterfaceUserMapperextendsBaseMapper<User>{List<User>selectUsersByCondition(Stringname,Integerage);} 1. 2. 3. 4. 5. Mapper XML配置 然后,在Mapper XML中编写SQL语句,使用LambdaQueryWrapper构建查询条件。 <selectid="selectUsersByCondition"resultType="User">SELECT id, name, age ...
Size(),page.getSize(),queryWrapper));}returnpage;}@Cacheable(cacheNames=RedisConfig.SBH_PLAT_ORDER_COUNT_CACHE_KEY,key="T(com.emax.zhenghe.common.util.security.MD5Util).md5Encode(#queryWrapper.customSqlSegment)")PrePageDtoselectCountCache(@Param(Constants.WRAPPER)Wrapper<SbhPlatOrder>queryWrapper...
public void selectByQueryWrapper3(){ QueryWrapperqueryWrapper=new QueryWrapper(); // QueryWrapperqueryWrapper2=Wrappers.query(); queryWrapper.apply("DATE_FORMAT(birthday,'%Y-%m-%d')>={0} and DATE_FORMAT(birthday,'%Y-%m-%d')<={1}","1993-02-09","1994-04-09").likeRight("name","李"); ...
mybatis QueryWrapper的条件构造之last、select eq.last(" group by DATE_FORMAT(benchmark_date,'%Y-%m')"); QueryWrapper<AssessmentDeptTask> wrapper = new QueryWrapper<>(); LambdaQueryWrapper<QuesAnswer> wrapper = new LambdaQueryWrapper<>();