数据库
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>
<!-- springboot 父工程依赖 -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
</parent>
<groupId>com.itheima</groupId>
<artifactId>itheima_springboot</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 设置 JDK 版本号 -->
<properties>
<java.version>1.8</java.version>
</properties>
<!-- 各种依赖坐标 -->
<dependencies>
<!-- 添加 spring-boot 的依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 添加 druid 的依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<!-- 不传递依赖 -->
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- 事务相关启动器依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- mysql依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<!-- mybatis依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<!-- 通用mapper -->
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>2.1.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
UserMapper.java接口
package com.itheima.mapper;
import com.itheima.pojo.User;
//import org.springframework.stereotype.Component;
import tk.mybatis.mapper.common.Mapper;
//@Component(value = "userMapper")
public interface UserMapper extends Mapper<User> {
}
Application 启动类
package com.itheima;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;
/**
* spring boot 工程都有一个启动引导类,这是工程的入口类
* 并在引导类上添加 @SpringBootApplication
*/
@SpringBootApplication
// 扫描 mybatis 所有的业务 mapper 接口
//@MapperScan("com.itheima.mapper")
@MapperScan("com.itheima.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}
User 实体类
package com.itheima.pojo;
import lombok.Data;
import tk.mybatis.mapper.annotation.KeySql;
//import lombok.extern.slf4j.Slf4j;
//import org.slf4j.Logger;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;
// 在编译阶段会根据注解自动生成对应的方法;data包含get/set/hashCode/equals/toString 等方法
@Data
@Table(name = "tb_user")
public class User {
@Id
// 主键回填
@KeySql(useGeneratedKeys = true)
private Long id;
// 在数据库和实体类属性名相同或者是驼峰命名法的,()中就可以不写
// 当数据库字段名和实体类属性名不一致的时候,填写数据库字段名
@Column(name = "user_name")
private String userName;
@Column(name = "password")
private String password;
@Column(name = "name")
private String name;
@Column(name = "age")
private Integer age;
@Column(name = "sex")
private Integer sex;
@Column(name = "birthday")
private Date birthday;
@Column(name = "note")
private String note;
@Column(name = "created")
private Date created;
@Column(name = "update")
private Date update;
}
UserService
HelloController
package com.itheima.controller;
import com.itheima.pojo.User;
import com.itheima.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
//import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import javax.sql.DataSource;
@RestController
public class HelloController {
@Autowired
private DataSource dataSource;
@Value("${itcast.url}")
private String itcastUrl;
@Value("${itheima.url}")
private String itheimaUrl;
@Autowired
private UserService userService;
/**
* 根据用户id查询用户
* @param id
* @return
*/
@GetMapping("/user/{id}")
private User queryById(@PathVariable Long id){
return userService.queryById(id);
}
// @RequestMapping
@GetMapping("hello")
public String hello(){
System.out.println("DataSource="+dataSource);
System.out.println("itcastUrl="+itcastUrl);
System.out.println("itheimaUrl="+itheimaUrl);
return "Hello,Spring Boot";
}
}
application.yml配置
jdbc:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springboot_test
username: root
password: root
# 激活配置文件,需要指定其他的配置文件名称
spring:
profiles:
active: abc,def
# 配置事务
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springboot_test
username: root
password: root
# tomcat 端口修改
server:
port: 80
# 日志记录级别
logging:
level:
com.itheima: debug
org.springframework: info
mybatis:
# 配置实体类别名包路径
type-aliases-package: com.itheima.pojo
# 映射文件路径
# mapper-locations: classpath:mappers/*.xml
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
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