springboot 实用技巧

1. MySQL 数据库
    
    # 根据severity 字段分类统计数量
    @Query(value = "select severity,COUNT(*) as cCount FROM quality WHERE project=?1  GROUP BY severity", nativeQuery = true)
    List<Object[]> querySeverityForDashQualityPie(String project);

    # 对customer 进行stage 数量统计
    @Query(value = "select a.customer,b.stage,count(*) as num FROM quality a LEFT JOIN project b ON a.id=b.id GROUP BY a.customer,b.stage", nativeQuery = true)
    List<Object[]> queryCustomerStageForDashProjectBar();

    # 天统计
    @Query(value = "select DATE_FORMAT(createtime,'%Y%m%d') as days,COUNT(id) as cCount FROM quality p WHERE project=?1 GROUP BY days ORDER BY days ASC", nativeQuery = true)
    List<Object[]> queryDailyCreateForDashQualityList(String project);
 
    # 周统计
    @Query(value = "select DATE_FORMAT(createtime,'%y%u')+1 as weeks,COUNT(id) as cCount FROM quality p WHERE project=?1 GROUP BY weeks", nativeQuery = true)
    List<Object[]> queryWeeklyCreateForDashQualityList(String project);

    # 根据severity 统计当天创建的
    @Query(value = "select severity,COUNT(*) as cCount FROM quality WHERE project=?1  AND to_days(createtime)=to_days(now()) GROUP BY severity", nativeQuery = true)
    List<Object[]> queryTodayCreateJiraForDi(String project);

    # updatedtime 在48小时之前
    @Query(value = "select jira,DATE_FORMAT(updatedtime,'%Y%m%d %H:%i:%S') as updatedtime FROM quality p WHERE project=?1 AND severity in ('S', 'A') AND updatedtime < date_sub(now(), interval 48 hour)", nativeQuery = true)
    List<Object[]> querySaOpenTO(String project);
    
    # 通配符
    @Query(value = "select * from project WHERE sysactive is true AND project=?1 AND (vpm=?2 OR svpm LIKE %?2%)", nativeQuery = true)
    ProjectEntity queryActivedProjectForVpm(String project, String vpmname);

    # 数据表两次别名后连表查询
    SELECT moreinfo.customer, moreinfo.hoursneed, moreinfo.hoursreal, moreinfo.hoursgap, moreinfo.tasknum, lessinfo.taskcompletenum FROM 
(SELECT customer,count(id) as tasknum, sum(hours) as hoursneed,sum(hoursreal) as hoursreal,sum(hoursgap) as hoursgap FROM tinno_dev.weeklytask  where week="29" and site="南昌" group by customer ) AS moreinfo INNER JOIN 
(SELECT customer,count(id) as taskcompletenum FROM tinno_dev.weeklytask where week="29" and site="南昌" and status="已完成" group by customer) AS lessinfo ON moreinfo.customer = lessinfo.customer;


1.1 mysql 使用注意事项
    # 日期查询，遇到between ?1 and ?2 的情况，区分?1 和 ?2是否为同一天，是同一天则会无数据。
    # 日期查询，MySQL 字段为Date类型，@Query查询的方法可能需要把Date类型参数转为String类型。
      因为Date 类型在使用between 查询，遇到datetime 存储时会出现左右闭合问题。


2. MySQL workbench
    #解开My SQL workbench安全模式
    SET SQL_SAFE_UPDATES=0;


3. Oracle
    # 筛选前10条
    # 并非所有的数据库系统都支持 SELECT TOP 语句。 MySQL 支持 LIMIT 语句来选取指定的条数数据， Oracle 可以使用 ROWNUM 来选取。
    select * from (select * from tinnobpm.tbl_proj_workhour WHERE center='测试中心' ORDER BY workdate DESC, id desc) where rownum <=10 ;


4. vscode 清理项目缓存
    a. ctrl + shift + p
    b. 输入Java: Clean Java language server workspace
    c. 选择"Restart and delete"