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spring Data JPA 关键字Exists 查询数据库中的此数据是否已存在: 例子: 查询sys_user表中的一个user是否存在,类SysUser对应的是数据库中的sys
查询数据库中的此数据是否已存在:
查询sys_user表中的一个user是否存在,类SysUser对应的是数据库中的sys_user表,SysUserId是表sys_user的主键类(ID类)。
如果查询一个user,user的accountNo为demo。
userID为demo1,表sys_user的主键是accountNo和userID,下面代码中的方法是查询这个user是否存在,如果存在则返回true,不存在则返回false。
@Repository
public interface SysUserRepository extends JpaRepository<SysUser, SysUserId> {
@Override
boolean exists(SysUserId sysUserId);
}
Sample | JPQL snippet | |
---|---|---|
And |
findByLastnameAndFirstname |
… where x.lastname = ?1 and x.firstname = ?2 |
Or |
findByLastnameOrFirstname |
… where x.lastname = ?1 or x.firstname = ?2 |
Is,Equals |
findByFirstname,findByFirstnameIs,findByFirstnameEquals |
… where x.firstname = ?1 |
Between |
findByStartDateBetween |
… where x.startDate between ?1 and ?2 |
LessThan |
findByAgeLessThan |
… where x.age < ?1 |
LessThanEqual |
findByAgeLessThanEqual |
… where x.age <= ?1 |
GreaterThan |
findByAgeGreaterThan |
… where x.age > ?1 |
GreaterThanEqual |
findByAgeGreaterThanEqual |
… where x.age >= ?1 |
After |
findByStartDateAfter |
… where x.startDate > ?1 |
Before |
findByStartDateBefore |
… where x.startDate < ?1 |
IsNull |
findByAgeIsNull |
… where x.age is null |
IsNotNull,NotNull |
findByAge(Is)NotNull |
… where x.age not null |
Like |
findByFirstnameLike |
… where x.firstname like ?1 |
NotLike |
findByFirstnameNotLike |
… where x.firstname not like ?1 |
StartingWith |
findByFirstnameStartingWith |
… where x.firstname like ?1(parameter bound with appended %) |
EndingWith |
findByFirstnameEndingWith |
… where x.firstname like ?1(parameter bound with prepended %) |
Containing |
findByFirstnameContaining |
… where x.firstname like ?1(parameter bound wrapped in %) |
OrderBy |
findByAgeOrderByLastnameDesc |
… where x.age = ?1 order by x.lastname desc |
Not |
findByLastnameNot |
… where x.lastname <> ?1 |
In |
findByAgeIn(Collection<Age> ages) |
… where x.age in ?1 |
NotIn |
findByAgeNotIn(Collection<Age> age) |
… where x.age not in ?1 |
True |
findByActiveTrue() |
… where x.active = true |
False |
findByActiveFalse() |
… where x.active = false |
IgnoreCase |
findByFirstnameIgnoreCase |
… where UPPER(x.firstame) = UPPER(?1) |
KeyWord | Sample | JPQL snippet |
---|---|---|
And |
findByLastnameAndFirstname |
… where x.lastname = ?1 and x.firstname = ?2 |
Or |
findByLastnameOrFirstname |
… where x.lastname = ?1 or x.firstname = ?2 |
Is,Equals |
findByFirstname,findByFirstnameIs,findByFirstnameEquals |
… where x.firstname = ?1 |
Between |
findByStartDateBetween |
… where x.startDate between ?1 and ?2 |
LessThan |
findByAgeLessThan |
… where x.age < ?1 |
LessThanEqual |
findByAgeLessThanEqual |
… where x.age <= ?1 |
GreaterThan |
findByAgeGreaterThan |
… where x.age > ?1 |
GreaterThanEqual |
findByAgeGreaterThanEqual |
… where x.age >= ?1 |
After |
findByStartDateAfter |
… where x.startDate > ?1 |
Before |
findByStartDateBefore |
… where x.startDate < ?1 |
IsNull |
findByAgeIsNull |
… where x.age is null |
IsNotNull,NotNull |
findByAge(Is)NotNull |
… where x.age not null |
Like |
findByFirstnameLike |
… where x.firstname like ?1 |
NotLike |
findByFirstnameNotLike |
… where x.firstname not like ?1 |
StartingWith |
findByFirstnameStartingWith |
… where x.firstname like ?1(parameter bound with appended %) |
EndingWith |
findByFirstnameEndingWith |
… where x.firstname like ?1(parameter bound with prepended %) |
Containing |
findByFirstnameContaining |
… where x.firstname like ?1(parameter bound wrapped in %) |
OrderBy |
findByAgeOrderByLastnameDesc |
… where x.age = ?1 order by x.lastname desc |
Not |
findByLastnameNot |
… where x.lastname <> ?1 |
In |
findByAgeIn(Collection<Age> ages) |
… where x.age in ?1 |
NotIn |
findByAgeNotIn(Collection<Age> age) |
… where x.age not in ?1 |
True |
findByActiveTrue() |
… where x.active = true |
False |
findByActiveFalse() |
… where x.active = false |
IgnoreCase |
findByFirstnameIgnoreCase |
… where UPPER(x.firstame) = UPPER(?1) |
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。
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本文标题: Spring Data JPA 关键字Exists的用法说明
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