SpringDataJPA中的JPQL

SpringDataJPA中的JPQL

示例：

注：jpql查询不需要事务的支持，但增删改需要事务的支持

1.Employee实体类：

@Entity
public class Employee {
	private Integer empId;
	private String empAddress;
	private Integer empAge;
	private String empGender;
	private String empName;
	private Double empSalary;
	private Date empStartDate;
	private Integer empStatus;
//	private String deptId; 
	private Department dept;
	
//	private String deptDeptId;
	
//	public String getDeptDeptId() {
//		return deptDeptId;
//	}
//	public void setDeptDeptId(String deptDeptId) {
//		this.deptDeptId = deptDeptId;
//	}
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	public Integer getEmpId() {
		return empId;
	}
	public void setEmpId(Integer empId) {
		this.empId = empId;
	}
	public String getEmpAddress() {
		return empAddress;
	}
	public void setEmpAddress(String empAddress) {
		this.empAddress = empAddress;
	}
	public Integer getEmpAge() {
		return empAge;
	}
	public void setEmpAge(Integer empAge) {
		this.empAge = empAge;
	}
	public String getEmpGender() {
		return empGender;
	}
	public void setEmpGender(String empGender) {
		this.empGender = empGender;
	}
	public String getEmpName() {
		return empName;
	}
	public void setEmpName(String empName) {
		this.empName = empName;
	}
	public Double getEmpSalary() {
		return empSalary;
	}
	public void setEmpSalary(Double empSalary) {
		this.empSalary = empSalary;
	}
	public Date getEmpStartDate() {
		return empStartDate;
	}
	public void setEmpStartDate(Date empStartDate) {
		this.empStartDate = empStartDate;
	}
	public Integer getEmpStatus() {
		return empStatus;
	}
	public void setEmpStatus(Integer empStatus) {
		this.empStatus = empStatus;
	}
	@ManyToOne
	@JoinColumn(name="deptId")
	public Department getDept() {
		return dept;
	}
	public void setDept(Department dept) {
		this.dept = dept;
	}
	@Override
	public String toString() {
		return "Employee [empId=" + empId + ", empAddress=" + empAddress + ", empAge=" + empAge + ", empGender="
				+ empGender + ", empName=" + empName + ", empSalary=" + empSalary + ", empStartDate=" + empStartDate
				+ ", empStatus=" + empStatus + "]";
	}
	public Employee(Integer empId, String empAddress, Integer empAge, String empGender, String empName,
			Double empSalary, Date empStartDate, Integer empStatus) {
		super();
		this.empId = empId;
		this.empAddress = empAddress;
		this.empAge = empAge;
		this.empGender = empGender;
		this.empName = empName;
		this.empSalary = empSalary;
		this.empStartDate = empStartDate;
		this.empStatus = empStatus;
	}
	public Employee() {
	}
	public Employee(Integer empId, String empName, Double empSalary) {
		
		super();
//		System.out.println("调用了三个参数的有参构造方法");
		this.empId = empId;
		this.empName = empName;
		this.empSalary = empSalary;
	}
	
	

}

2.Department实体类：

@Entity
public class Department {
	private Integer deptId;
	private String deptName;
	private String deptManager;
	private Set emps = new HashSet();
	@OneToMany(mappedBy="dept",fetch=FetchType.LAZY)
//	@JoinColumn(name="deptId")
	public Set getEmps() {
		return emps;
	}

	public void setEmps(Set emps) {
		this.emps = emps;
	}

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	public Integer getDeptId() {
		return deptId;
	}

	public void setDeptId(Integer deptId) {
		this.deptId = deptId;
	}

	public String getDeptName() {
		return deptName;
	}

	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}

	public String getDeptManager() {
		return deptManager;
	}

	public void setDeptManager(String deptManager) {
		this.deptManager = deptManager;
	}

	@Override
	public String toString() {
		return "Department [deptId=" + deptId + ", deptName=" + deptName + ", deptManager=" + deptManager +  "]";
	}

	public Department(Integer deptId, String deptName, String deptManager) {
		super();
		this.deptId = deptId;
		this.deptName = deptName;
		this.deptManager = deptManager;
	}

	public Department() {
		super();
	}

}

3.EmployeeDao接口层：

public interface EmployeeDao extends Repository{
	
	/**
	 * 按照id修改用户的名字和年龄
	 */
	@Modifying
	@Query("update Employee e set e.empName = ?1,e.empAge=?2 where e.empId=?3")
	public Integer updateNameAndAgeById(String empName,Integer empAge,Integer id);
	
	/**
	 * 什么时候，使用JPQL?
	 * 	方法命名规范很好用，不一定能胜任任何场景，编写JPQL与方法映射。
	 */
	/**
	 * 按照性别查询员工信息，要求使用jpql
	 */
//	@Query("select e from Employee e where e.empGender = ?1")
	@Query(value="select * from employee where empGender = ?1",nativeQuery=true)
	public List abcdefg(String gender);

}

4.EmployeeService服务层：

public interface EmployeeService {
	public Integer updateNameAndAgeById(String empName,Integer empAge,Integer empId);
}

5.EmployeeServiceImpl实现类：

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {
@Autowired
private EmployeeDao employeeDao;
	
	@Override
	public Integer updateNameAndAgeById(String empName, Integer empAge, Integer empId) {
		Integer updateNameAndAgeById = employeeDao.updateNameAndAgeById(empName,empAge,empId);
		return updateNameAndAgeById;
	}
}

6.测试类：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:spring-beans.xml")
public class EmployeeServiceTest {
@Autowired
EmployeeService service;
	@Test
	public void testUpdateNameAndAgeById() {
		Integer updateNameAndAgeById = service.updateNameAndAgeById("钱媛", 18, 9);
		System.out.println(updateNameAndAgeById);
	}
	@Test
	public void testAbcdef(){
		List abcdefg = employeeDao.abcdefg("男");
		for (Employee employee : abcdefg) {
			System.out.println(employee.getEmpName()+":"+employee.getEmpAge()+":"+employee.getEmpGender());
		}
	}
}

7.spring-beans.xml配置文件：

	
	
	
	
		
		
		
		
	

	
	
		
		
			
		
		
		
		
			
				

				
				org.hibernate.dialect.MySQL5InnoDBDialect
				true
				true
				update
			
		
	

	
	
		
	
	

	
	
	

8.jdbc.properties配置文件：

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/jpa
jdbc.user=root
jdbc.password=123123