SpringDataJPA配置及其方法命名规范
@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;
@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;
}
}
/**
* Repository:
* T:表示,当前接口,操作的实体类类型
* Serializable:指定主键的类型
* @author boge
*
*/
public interface EmployeeDao extends CrudRepository{
//只需要按照springdata提供的命名规范,根据查询需求,来为方法命名即可。
//如:当前我们希望按照性别查询员工信息,拼接方法名,符合驼峰命名法
//指定符合逻辑的方法返回值与参数列表
public List findByEmpGender(String gender);
//按照姓名进行查询
public List findByEmpName(String empName);
//按照姓氏进行模糊查询
public List findByEmpNameLike(String empName);
//按照年龄查询
public List findByEmpAge(Integer age);
//按照empAddress查询
public List findByEmpAddress(String address);
//查找年龄大于50的员工信息
public List findByEmpAgeGreaterThan(Integer age);
//查询50岁以上的男性员工
public List findByEmpAgeGreaterThanAndEmpGender(Integer age,String gender);
/**
* 查询所有男性员工信息
*/
public List findByEmpGender(String gender);
/**
* 按照性别查询,并且按照年龄进行降序排序
*/
public List findByEmpGenderOrderByEmpAgeDesc(String gender);
/**
* 按照部门编号,查找员工信息
* 可以使用级联查询,非常方便,自动将对应的字段转换成关联的另一个实体类
* 也有一种情况:
* 级联查询的最终拼接成的DeptDeptId,恰好与当前实体类的某一个属性同名deptDeptId
* 优先,使用当前实体类的这个属性。
* 如果遇到这种情况,还想继续使用级联查询:
* 可以通过下划线,来区分:
*
*/
public List findByDept_DeptId(Integer deptId);
/**
* 还可以在方法参数中,使用分页参数(Pageable)、排序参数(Sort),实现分页与排序功能。
* 按照年龄区间范围查询,并且分页显示
*/
public List findByEmpAgeBetween(Integer start,Integer end);
//添加分页功能,通过方法重载,添加分页参数(Pageable)
public List findByEmpAgeBetween(Integer start,Integer end,Pageable pageable);
}
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:spring-beans.xml")
public class EmployeeDaoTest {
@Autowired
EmployeeDao dao;
@Test
public void testFindByEmpGender() {
List findByEmpGender = dao.findByEmpGender("男");
for (Employee employee : findByEmpGender) {
System.out.println(employee);
}
}
@Test
public void testFindByEmpName() {
List employee = dao.findByEmpName("周聪");
for (Employee employee2 : employee) {
System.out.println(employee2);
}
}
@Test
public void testFindByEmpNameLike() {
List findByEmpNameLike = dao.findByEmpNameLike("张%");
for (Employee employee : findByEmpNameLike) {
System.out.println(employee);
}
}
@Test
public void testFindByEmpAgeGreaterThanAndEmpGender() {
List list = dao.findByEmpAgeGreaterThanAndEmpGender(50, "男");
for (Employee employee : list) {
System.out.println(employee);
}
}
@Test
public void testFindByEmpAge() {
List employee = dao.findByEmpAge(50);
for (Employee employee2 : employee) {
System.out.println(employee2);
}
}
@Test
public void testFindByEmpAddress() {
List employee = dao.findByEmpAddress("北京");
for (Employee employee2 : employee) {
System.out.println(employee2);
}
}
@Test
public void testFindByEmpAgeGreaterThan() {
List employee = dao.findByEmpAgeGreaterThan(50);
for (Employee employee2 : employee) {
System.out.println(employee2);
}
}
@Test
public void testFindByEmpAgeBetween(){
//指定分页参数 参数1:页码,页码从0开始,参数2:每页显示大小
PageRequest pageRequest = new PageRequest(0, 5);
List result = employeeDao.findByEmpAgeBetween(20,50,pageRequest);
for (Employee employee : result) {
System.out.println(employee.getEmpName()+":"+employee.getEmpAge()+":"+employee.getEmpGender());
}
}
@Test
public void testFindByDeptDeptId(){
List result = employeeDao.findByDept_DeptId(4);
for (Employee employee : result) {
System.out.println(employee.getEmpName()+":"+employee.getEmpAge()+":"+employee.getEmpGender());
}
}
@Test
public void testFindByEmpGenderOrderByEmpAgeDesc(){
List findByEmpGenderOrderByEmpAgeDesc = employeeDao.findByEmpGenderOrderByEmpAgeDesc("女");
for (Employee employee : findByEmpGenderOrderByEmpAgeDesc) {
System.out.println(employee.getEmpName()+":"+employee.getEmpAge()+":"+employee.getEmpGender());
}
}
@Test
public void testFindByEmpGender() {
List findByEmpGender = employeeDao.findByEmpGender("男");
for (Employee employee : findByEmpGender) {
System.out.println(employee.getEmpName()+":"+employee.getEmpAge()+":"+employee.getEmpGender());
}
}
}
org.hibernate.dialect.MySQL5InnoDBDialect
true
true
update
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/jpa
jdbc.user=root
jdbc.password=123123
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