顾名思义,方法命名规则查询就是根据方法的名字,就能创建查询。只需要按照Spring Data JPA提供的方法命名规则定义方法的名称,就可以完成查询工作。Spring Data JPA在程序执行的时候会根据方法名称进行解析,并自动生成查询语句进行查询
按照Spring Data JPA 定义的规则,查询方法以findBy开头,涉及条件查询时,条件的属性用条件关键字连接,要注意的是:条件属性首字母需大写。框架在进行方法名解析时,会先把方法名多余的前缀截取掉,然后对剩下部分进行解析。
//方法命名方式查询(根据客户名称查询客户) public Customer findByCName(String cName);
具体的关键字,使用方法和生产成SQL如下表所下
关键字 | 例子 | JPQL |
And | findByLastnameAndFirstname | … where x.lastname = ?1 and x.firstname = ?2 |
Or | findByLastnameOrFirstname | … where x.lastname = ?1 or x.firstname = ?2 |
Is,Equals | 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 is not null |
Like | findByFirstnameLike | … where x.firstname like ?1 |
NotLike | findByFirstnameNotLike | … where x.firstname not like ?1 |
原文:https://www.cnblogs.com/zhaochengf/p/12127837.html