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创建spring-boot项目:
1,在spring.io官网下载spring-boot项目
2,点击spring boot进入
选择spring Initializr
3,下载设置
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/> <!-- lookup parent from repository -->
</parent>
<!--如果项目中已有父类,上面则换成下面格式-->
<dependencyManagement>
<dependencies>
<dependency>
<!-- Import dependency management from Spring Boot -->
<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><!-- 设置各个jar版本-->
<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><!-- 设置web启动必须有-->
<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><!-- 设置数据库连接jpa-jar包-->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency><!-- 设置mysql驱动-->
<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><!--热加载-->
<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