【idea】Springboot整合jpa


第一步快速搭建springboot項目:在你建立的工程下創建 Module 選擇Spring initializr創建。

 

第二步:修改包名、項目名、web項目打成war包、在Type處選擇: Maven Project(項目的構建工具)

第三步:選擇你項目需要的基本依賴

  

第四步:結束

 

springboot項目的結構:

 

注意點:

  1、.mvn文件、mvnw、mvnw.cmd可以刪掉

  2、程序啟動類必須在所有接口類的上一層,才能被掃描到

配置數據庫連接文件:(兩種文件形式的:properties、yml)默認掃描:application開頭的文件

  

具體類容:yml文件形式

spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/xxx?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&serverTimezone=GMT%2B8
username: xxx
password: xxx

創建實體類:

    

@Entity    --需要導入jpa依賴包
@Table(name="employee")    ---指向數據庫的表名
public class Employee {
@Id            --表中的主鍵、自增長形式
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer empNo;
private String empName;
private String empSex;
private Integer empAge;
private Double sal;
private Date history;
public Employee() {
}

public Employee(Integer empNo, String empName, String empSex, Integer empAge, Double sal, Date history) {
this.empNo = empNo;
this.empName = empName;
this.empSex = empSex;
this.empAge = empAge;
this.sal = sal;
this.history = history;
}

public Integer getEmpNo() {
return empNo;
}

public void setEmpNo(Integer empNo) {
this.empNo = empNo;
}

public String getEmpName() {
return empName;
}

public void setEmpName(String empName) {
this.empName = empName;
}

public String getEmpSex() {
return empSex;
}

public void setEmpSex(String empSex) {
this.empSex = empSex;
}

public Integer getEmpAge() {
return empAge;
}

public void setEmpAge(Integer empAge) {
this.empAge = empAge;
}

public Double getSal() {
return sal;
}

public void setSal(Double sal) {
this.sal = sal;
}

public Date getHistory() {
return history;
}

public void setHistory(Date history) {
this.history = history;
}

@Override
public String toString() {
return "Employee{" +
"empNo=" + empNo +
", empName='" + empName + '\'' +
", empSex='" + empSex + '\'' +
", empAge=" + empAge +
", sal=" + sal +
", history=" + history +
'}';
}
}

 數據層:直接繼承JpaRepositoryAPI類

public interface EmployeeDaoImpl extends JpaRepository<Employee,Integer> {



}

注意此處省略service層、是為了測試小demo

 控制層:

@RestController        ---rest分格
@RequestMapping("/jpa")   ----請求模塊分層
public class JpaController {
@Autowired         ----注入
private EmployeeDaoImpl employeeDaoImpl;
@RequestMapping(value = "/select",method = RequestMethod.GET)
public List<Employee> selectUser(){//查
return employeeDaoImpl.findAll();
}
@RequestMapping(value = "/add",method = RequestMethod.POST)
public String addUser(Employee emp){//增
Employee employee=new Employee();
employee.setEmpName(emp.getEmpName());
employee.setEmpAge(emp.getEmpAge());
employee.setEmpSex(emp.getEmpSex());
employee.setHistory(new Date());
employee.setSal(emp.getSal());
Employee employee1=employeeDaoImpl.save(employee);
return employee1.toString();
}
@RequestMapping(value = "/delete",method = RequestMethod.DELETE)
public void deleteUser(@RequestParam(value = "id")Integer id){//刪
employeeDaoImpl.deleteById(id);
}
@RequestMapping(value="/{id}" ,method=RequestMethod.GET)
public Optional<Employee> getAccountById(@PathVariable("id") int id){
return employeeDaoImpl.findById(id);
}
@RequestMapping(value = "/update",method = RequestMethod.PUT)
public Employee updateUser(Employee emp){//修
return employeeDaoImpl.save(emp);
}

}
postman測試:CRUD

 

 

---不足之處,請多指教

 

 


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