spring-boot项目与spring-boot-data-jpa数据连接结合创建项目详情

超、凢脫俗 2021-09-27 15:20 260阅读 0赞

创建spring-boot项目:

1,在spring.io官网下载spring-boot项目

![70][]

2，点击spring boot进入

![70 1][]选择spring Initializr

3,下载设置![70 2][]

项目下载到本地后（删除不需要的，可删可不删）maven导入eclipse

# **eclipse中的设置** #

1:，设置application.properties

# 服务器访问端口
    server.port=8080
    # 数据库基本配置
    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
    spring.datasource.username=root
    spring.datasource.password=root
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    
    spring.jpa.database=MYSQL
    # 显示后台处理的SQL语句
    spring.jpa.show-sql=true
    # 自动检查实体和数据库表是否一致，如果不一致则会进行更新数据库表
    spring.jpa.hibernate.ddl-auto=update

2，设置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.qxmof</groupId>
    	<artifactId>springutil</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>springutil</name>
    	<description>Demo project for Spring Boot</description>
    
        
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.3.RELEASE</version>
    		<relativePath/> 
    	</parent>
        
    
        <dependencyManagement>
             <dependencies>
                <dependency>
                    
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>1.2.3.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
    
    
    	<properties>
    		<mysql-connector.version>5.1.38</mysql-connector.version>
    		<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-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		
    		<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
            
            <dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>${mysql-connector.version}</version>
    		</dependency>
    			
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    
                      <dependencies>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>springloaded</artifactId>
                            <version>1.2.5.RELEASE</version>
                        </dependency>
                    </dependencies>
    
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>

3，设置连接数据库类Dao

@Repository
    @Transactional//必须加入事务，否则会报错
    public interface TestService extends JpaRepository<Test, Integer>{//此处Test会直接生成数据库与表
    
        //自定义sql
    	@Modifying
    	@Query(value = "update es_test et set et.name = :name where et.id = :id",nativeQuery = true)
    	public int update(@Param("name") String name,@Param("id") Integer id);
    }

4，创建实体类

@Entity//实体类
    @Table(name="es_test")//映射数据库表名
    public class Test {
    
    	@Id//注释id
    	@GeneratedValue//z主键类型
    	private Integer id;
    	
    	@Column(name = "name", nullable = true,length=22)//标识数据库名称，是否为空，长度
    	private String name;
    	
    	@Column(name = "age", nullable = true,length=22)
    	private String age;
    	
    	@Column(name = "createtime", nullable = true,length=22)
    	@DateTimeFormat
    	private long createtime;
    
    	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 String getAge() {
    		return age;
    	}
    
    	public void setAge(String age) {
    		this.age = age;
    	}
    
    	public long getCreatetime() {
    		return createtime;
    	}
    
    	public void setCreatetime(long createtime) {
    		this.createtime = createtime;
    	}

5，控制器调用

@RestController//所有方法返回数据，但是不能返回html,jsp,若要返回html改成@Controller
    public class TestController { 
     @RequestMapping("/test_update")
    	public String update(Integer id){
    		Test test = testService.getOne(id);//此方法是JpaRepository自带
    		String a = test.getName();
    		int num =testService.update("222",id);//此方法是自定义修改
    //		test.setName("aaaaa");
    //		test.setCreatetime(System.currentTimeMillis()/1000);
    //		testService.save(test);
    		Test test1 = testService.getOne(id);
    		return a+"```"+test1.getName();
    	}
    }

6，启动SpringutilApplication.run方法

[70]: /images/20210923/fb201cde3f054295a2438e824a161f1d.png
[70 1]: /images/20210923/85026b6767cb40bfa597823a65161e6d.png
[70 2]: /images/20210923/88c957125f764946a3f4958ad5c43d57.png