如何使用like运算符编写jpql查询

如何解决如何使用like运算符编写jpql查询

如何在java类的JPQL中编写下面的SQL查询

select e.emp_id,e.emp_name
from emp e 
left outer join dept on e.dept_id = d.dept_id and upper(d.dept_name) like upper('%dev%') 

我在下面尝试过它对我不起作用。我需要像关键字后如何用两个百分位和参数名称编写

@Query(value = "select e.emp_id,e.emp_name from emp e left outer join dept on e.dept_id= d.dept_id and upper(d.dept_name)  like upper(%:deptName%),nativeQuery = true)
List<Employee> searchAllEmployees(@Param("deptName")String deptName);

解决方法

假设您有以下 Employee 实体：

@Entity
public class Employee
{
   @Id
   @Column(name = "emp_id")
   Long id;

   @Column(name = "emp_name")
   String name;

   @ManyToOne
   @JoinColumn(name = "dept_id")
   Department department;
}

@Entity
public class Department
{
   @Id
   @Column(name = "dept_id")
   Long id;

   @Column(name = "dept_name")
   String name;
}

你可以写如下jpql：

@Query("select e from Employee e left join e.department d where upper(d.name) like '%' || upper(:deptName ) || '%'")
List<Employee> searchAllEmployees(@Param("deptName")String deptName);

另请参阅 hibernate 文档的 this 部分。