("One record is expected, but the query result is multiple records"); } return ts.get(0); } return null; } /** * 根据 Wrapper 条件,判断是否存在记录 * * @param queryWrapper 实体对象封装操作类 * @return */ default boolean exists(
stuIds);// 通过学生ID查询课程分数List<StuSubRelation> stuSubRelations = stuSubRelationMapper.selectList(wrapper);// 批量查询课程IDSet<Integer> subIds = stuSubRelations.stream().map(StuSubRelation::getSubId).collect(toSet());if(stuIds.size() >0&& subIds.size(...
appendSelectItem(plainSelect.getSelectItems()); processInsertSelect(subSelect.getSelectBody()); } } /** * 追加 SelectItem * * @param selectItems SelectItem */ protected void appendSelectItem(List<SelectItem> selectItems) { if (CollectionUtils.isEmpty(selectItems)) return; if (selectItems.size...
convertObj(getById(stuId), StudentVo::new); LambdaQueryWrapper<StuSubRelation> wrapper = Wrappers.lambdaQuery(StuSubRelation.class).eq(StuSubRelation::getStuId, stuId); // 查询匹配关系 List<StuSubRelation> stuSubRelations = stuSubRelationMapper.selectList(wrapper); Set<Integer> subIds = stuSub...
// 使用Lambda方式构造查询条件QueryWrapper<User>queryWrapper=newQueryWrapper<>();queryWrapper.apply("age < {0}",30);// 构造子查询QueryWrapper<Order>subQueryWrapper=newQueryWrapper<>();subQueryWrapper.inSql("user_id","SELECT id FROM user WHERE age < 30");// 嵌套查询queryWrapper.inSql("id",sub...
select("PracticeID", "PracticeName", "PracticeUser", "QuestionTypes", "QuestionSubjects", "CreateDate", "TotalCount", "PracticeCount", "WrongCount", "LastPracticeDate", "LastPracticeQuestionID", "LastPracticeQuestionSubID") .eq("practiceid", parentid).eq("practiceUser ", practiceUser));...
public SetgetSelectFields() { return set; } public String getMainTable() { return mainTable; } public String getSubTable() { return this.joinTable; } /** * @param joinType 关联类型 JoinBuilder.LEFT,JoinBuilder.RIGHT,JoinBuilder.INNER ...
MyBatis-Plus 调用存储过程可以通过在 Mapper 接口中定义方法,并在对应的 XML 映射文件中编写相应的 SQL 语句来实现。 具体步骤 定义Mapper 接口方法: 在Mapper 接口中定义一个方法,该方法将用于调用存储过程。方法的参数类型应与存储过程的输入参数类型相匹配。 java public interface UserInfoMapper extends BaseMapper...
select * matchAllQuery QueryBuilders.matchAllQuery() - highLight HighlightBuilder.Field ... ... ... 集成及配置 接下来把Easy-Es集成到项目中配置下就可以使用了。 首先需要在pom.xml中添加Easy-Es的相关依赖; <dependency> <groupId>cn.easy-es</groupId> <artifactId>easy-es-boot-starter</artifac...
studentMapper.selectById(1);//以id=1查询student202208这张表//阅后即焚,将ThreadLocal当前请求线程的数据移除MonthTableNameHandler.removeData(); II 分库分表 非必须勿使用分库分表:如数据库确实成为性能瓶颈时,在设计分库分表方案时应充分考虑方案的扩展性,或者考虑采用成熟热门的分布式数据库解决方案,如 TiDB...