springboot整合hibernate以及實體類自動化

• 第一步引入pom.xml依賴和application.properties信息

　　pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.13.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.hanweb</groupId>
    <artifactId>bbts</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
         <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.18</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

　　application.properties：

server.port=8081
#mysql
spring.datasource.url=jdbc:mysql://localhost:3306/demo?useunicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=admine
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager 
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

• 第二步建實體類

　

package com.example.bbts.entity;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
/**
 * 
 * @author Administrator
 *
 */
import com.example.bbts.common.Tables;

@Entity
@Table(name = Tables.STUDENT)
public class Student implements Serializable {

    /**
     * 持久化參數
     */
    private static final long serialVersionUID = -8447170587360305408L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    @Column(name = "name")
    private String name;
    @Column(name = "age")
    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

• 第三步建立完整的mvc層

　　controller層：

　　

package com.example.bbts.controller;

import java.util.HashMap;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.bbts.entity.Student;
import com.example.bbts.service.StudentService;

/**
 * 
 * @author Administrator
 *
 */
@RestController
public class StudentController {

    @Autowired
    private StudentService studentService;
    
    @RequestMapping(value="/student")
    public HashMap<String, Object> getStudentList() {
        HashMap<String,Object> map = new HashMap<String, Object>();
        List<Student> list = studentService.get();
        map.put("student:", list);
        map.put("total", list.size());
        return map;
    }
    
}

　　　service層

　　

@Service
public class StudentService {

    @Autowired
    private StudentDao studentDao;
    
    /**
     * 
     * @return
     */
    public List<Student> get(){
        List<Student> list = studentDao.findAll();
        return list;
    }
}

　　　dao層（看好了兄弟），看好了再回來跟你說一下啊，hibernate是全自動orm持久層框架，所以他已經封裝了很多增刪改查的方法，只需要直接調取就行了。如果非要自己寫，那就session實例，在query塞入語句，進行操作。

　　

package com.example.bbts.dao;


import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.example.bbts.entity.Student;

/**
 * 
 * @author Administrator
 *
 */
@Repository
public interface StudentDao extends JpaRepository<Student, Integer>{

    
}

• 最重要的一步

　　

 

•  展示效果