springboot使用Jpa连接数据库

1.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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>

    <artifactId>spring-data_JpaAndJdbcTemplate</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>spring-mybatis</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.10.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter</artifactId>

            <exclusions>

                <exclusion>

                    <groupId>org.springframework.boot</groupId>

                    <artifactId>spring-boot-starter-logging</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-log4j</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>5.1.21</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-jpa</artifactId>

        </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>

2.application.properties:

spring.datasource.url=jdbc:mysql://localhost:3306/test

spring.datasource.username=root

spring.datasource.password=root

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3.Student:

package com.example.springmybatis.entity;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

@Entity

public class Student {

    @Id

    @GeneratedValue

    private String name;

    @Column(nullable = true)

    private int age;

    @Column(nullable = true)

    private String address;

    private String collage;

    private String sex;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    public String getCollage() {

        return collage;

    }

    public void setCollage(String collage) {

        this.collage = collage;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

    @Override

    public String toString() {

        return "Student{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", address='" + address + '\'' +

                ", collage='" + collage + '\'' +

                ", sex='" + sex + '\'' +

                '}';

    }

}

4.UserRepository:

package com.example.springmybatis.service;

import com.example.springmybatis.entity.Student;

import org.springframework.data.domain.Page;

import org.springframework.data.domain.Pageable;

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

import java.util.List;

public interface UserRepository extends JpaRepository<Student, Long> {

    List<Student> findByName(String name);

    Student findByNameAndAge(String name, Integer age);

    int findByAge(int age);

    Page<Student> findAll(Pageable pageable);

}

5.UserController:

package com.example.springmybatis.Controller;

import com.example.springmybatis.entity.Student;

import com.example.springmybatis.service.UserRepository;

import com.example.springmybatis.service_jdbc.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.domain.Page;

import org.springframework.data.domain.PageRequest;

import org.springframework.data.domain.Pageable;

import org.springframework.data.domain.Sort;

import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController

public class UserController {

    @Autowired

    private UserRepository userRepository;

/**

     * spring-data-jpa连接数据库

     * @param name

     * @param age

     * @return

     * @throws Exception

     */

    @RequestMapping(value = "/name", method = RequestMethod.GET)

    @ResponseBody

    public Student GetGoodList(@RequestParam("name") String name, @RequestParam(value = "age", required = false,

            defaultValue = "27") int age)throws Exception{

        Student user = userRepository.findByNameAndAge(name, age);

        return user;

    }

    @RequestMapping(value = "/names", method = RequestMethod.GET)

    @ResponseBody

    public List<Student> GetName(@RequestParam(value = "name", defaultValue = "易水寒") String name)throws Exception{

        List<Student> user = userRepository.findByName(name);

        return user;

    }

     /**

     * jpa排序分页

     * @param page

     * @param size

     * @return

     */

    @RequestMapping(value = "/finds", method=RequestMethod.GET)

    public Page<Student> getEntryByParams(@RequestParam(value = "page", defaultValue = "0") Integer page,

                                          @RequestParam(value = "size", defaultValue = "15") Integer size) {

        Pageable pageable = new PageRequest(page, size, Sort.Direction.DESC, "age");

        return userRepository .findAll(pageable);

    }

}

6.spring boot启动项：

package com.example.springmybatis;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class SpringDataJpaAPP {

    public static void main(String[] args) {

        SpringApplication.run(SpringDataJpaAPP.class, args);

    }

}

7.sql:

CREATE TABLE `student` (

  `name` varchar(100) NOT NULL,

  `age` int(10) NOT NULL,

  `address` varchar(100) NOT NULL,

  `collage` varchar(100) NOT NULL,

  `sex` varchar(10) NOT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8

巴特西

springboot使用Jpa连接数据库

springboot使用Jpa连接数据库

1.pom.xml:

2.application.properties:

3.Student:

4.UserRepository:

5.UserController:

6.spring boot启动项：

7.sql:

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