mybatis-plus 條件構造器整理及使用示例 / 時間查詢

一、條件構造器一覽

構造器數據載自官網集中整理

1、常用方法示例

條件構造器	構造方法	構造示例
eq	等於 =	eq(“name”, “老王”)—>name = ‘老王’
ne	不等於 <>	ne(“name”, “老王”)—>name <> ‘老王’
gt	大於 >	gt(“age”, 18)—>age > 18
ge	大於等於 >=	ge(“age”, 18)—>age >= 18
lt	小於 <	lt(“age”, 18)—>age < 18
le	小於等於 <=	le(“age”, 18)—>age <= 18
between	BETWEEN 值1 AND 值2	between(“age”, 18, 30)—>age between 18 and 30
like	LIKE ‘%值%’	like(“name”, “王”)—>name like ‘%王%’
in	字段 IN (value.get(0), value.get(1), …)	in(“age”,{1,2,3})—>age in (1,2,3)
orderByAsc	排序：ORDER BY 字段, … ASC	orderByAsc(“id”, “name”)—>order by id ASC,name ASC
orderByDesc	排序：ORDER BY 字段, … DESC	orderByDesc(“id”, “name”)—>order by id DESC,name DESC
orderBy	排序：ORDER BY 字段, …	orderBy(true, true, “id”, “name”)—>order by id ASC,name ASC
groupBy	分組：GROUP BY 字段	groupBy(“id”, “name”)—>group by id,name
or	拼接 OR	eq(“id”,1).or().eq(“name”,“老王”)—>id = 1 or name = ‘老王’
and	AND 嵌套	and(i -> i.eq(“name”, “李白”).ne(“status”, “活着”))—>and (name = ‘李白’ and status <> ‘活着’)

2、剩餘方法示例

條件構造器	構造方法	構造示例
allEq	全部eq	例1: allEq({id:1,name:“老王”,age:null})—>id = 1 and name = ‘老王’ and age is null
notBetween	NOT BETWEEN 值1 AND 值2	notBetween(“age”, 18, 30)—>age not between 18 and 30
notLike	NOT LIKE ‘%值%’	notLike(“name”, “王”)—>name not like ‘%王%’
likeLeft	LIKE ‘%值’	likeLeft(“name”, “王”)—>name like ‘%王’
likeRight	LIKE ‘值%’	likeRight(“name”, “王”)—>name like ‘王%’
isNull	字段 IS NULL	isNull(“name”)—>name is null
isNotNull	字段 IS NOT NULL	isNotNull(“name”)—>name is not null
notIn	字段 IN (value.get(0), value.get(1), …)	notIn(“age”,{1,2,3})—>age not in (1,2,3)
nested	正常嵌套 不帶 AND 或者 OR	nested(i -> i.eq(“name”, “李白”).ne(“status”, “活着”))—>(name = ‘李白’ and status <> ‘活着’)

3、sql 拼接方法示例

條件構造器	構造方法	構造示例
apply	拼接 sql	apply(“id = 1”)—>id = 1
last	無視優化規則直接拼接到 sql 的最後	last(“limit 1”)
exists	拼接 EXISTS ( sql語句 )	exists(“select id from table where age = 1”)—>exists (select id from table where age = 1)
notExists	拼接 NOT EXISTS ( sql語句 )	notExists(“select id from table where age = 1”)—>not exists (select id from table where age = 1)
inSql	字段 IN ( sql語句 )	inSql(“age”, “1,2,3,4,5,6”)—>age in (1,2,3,4,5,6)
notInSql	字段 NOT IN ( sql語句 )	notInSql(“age”, “1,2,3,4,5,6”)—>age not in (1,2,3,4,5,6)
having	HAVING ( sql語句 )	having(“sum(age) > 10”)—>having sum(age) > 10

二、只返回部分字段示例

1、只返回 product_id 和 agent_info_id 字段

.select(ActivityCouponSpu.class, info -> info.getColumn().equals("product_id") || info.getColumn().equals("agent_info_id")

2、不返回 product_id 和 agent_info_id 字段，其餘全返回

.select(ActivityCouponSpu.class, info -> !info.getColumn().equals("product_id") && !info.getColumn().equals("agent_info_id")

3、完整示例（只返回 product_id 和 agent_info_id 字段）

 List<ActivityCouponSpu> activityCouponSpus = activityCouponSpuMapper.selectList(new LambdaQueryWrapper<ActivityCouponSpu>()
                        .select(ActivityCouponSpu.class, info -> info.getColumn().equals("product_id") || info.getColumn().equals("agent_info_id"))
                        .eq(ActivityCouponSpu::getCouponId, ActivityCouponVo.getId())
                        .in(ActivityCouponSpu::getProductId, Arrays.asList(goodsIds.split(",")))
                );

三、時間處理相關寫法

1、mybatis-plus 使用 Lambda 查詢示例

• LambdaQueryWrapper：查詢
• LambdaUpdateWrapper：修改

 List<ActivityInfo> activityInfos = activityInfoMapper.selectList(new LambdaQueryWrapper<ActivityInfo>()
                .orderByDesc(ActivityInfo::getStartTime)
                .le(ActivityInfo::getShowTime, date)
                .ge(ActivityInfo::getNoShowTime, date)
                .eq(ActivityInfo::getStatus, StatusEnum.STATUS_YES)
                .eq(ActivityInfo::getType, ActivityTypeEnum.IS_BACK_SPIKE)
  );

2、雙字段時間段查詢 le / ge (startTime + endTime )

getShowTime： 活動開始展示時間
getNoShowTime： 活動結束展示時間
date: 當前時間
查詢當前正在處於活動期間的數據

 .ge(StringUtils.isNotBlank(starTime), ActivityCoupon::getStarTime, starTime)
 .le(StringUtils.isNotBlank(endTime), ActivityCoupon::getEndTime, endTime)

  db(2020-2-21)  >= ?(2020-2-20)   and  (2020-3-20)  <=    ?2020-3-21

3、雙字段時間段查詢 between ( Time )

• between（判空, 時間字段，開始時間，結束時間）
  time : 時間字段
  查詢 time 在startTime 和 endTime 時間區間內（startTime <= time <= endTime ）

 .between(StringUtils.isNotBlank(startTime) && StringUtils.isNotBlank(endTime) ,ActivityInfo::getTime,startTime,endTime)

4、時間排序