sprongboot学习：使用springboot整合mybatis+mysql
1、目录结构
2、整理配置文件
（一）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>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.hxk</groupId>
<artifactId>testmapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>testmapp</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-web</artifactId>
</dependency>
<!-- 导入mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
<!--导入mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
（二）application.properties
# 端口号8080 server.port=8080 # spring连接mysql配置 spring.datasource.username=root spring.datasource.password=123456 spring.datasource.url=jdbc:mysql://localhost:3306/datas?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver # mybatis #指定POJO扫描包来让mybatis自动扫描到自定义POJO mybatis.type-aliases-package=com.hxk.demo.entity mybatis.config-location=classpath:mybatis/mybatis-config.xml mybatis.mapperLocations=classpath:mybatis/mapper/*.xml
（三）mybatis配置
mybatis-config.xml ：驼峰配置
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>
UserMapper.xml：配置mybatis的sql语句（）
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.test.demo.mapper.UserMapper">
<select id="searchUser" resultType="com.test.demo.entity.User">
select *
from user
where id=#{id}
</select>
</mapper>
3、entiy
package com.test.demo.entity;
public class User {
private Integer id;
private String name;
private String password;
private String telphone;
public Integer getId() {
return id;
}
public String getName() {
return name;
}
public String getPassword() {
return password;
}
public String getTelphone() {
return telphone;
}
public void setId(Integer id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setPassword(String password) {
this.password = password;
}
public void setTelphone(String telphone) {
this.telphone = telphone;
}
}
4、UserController
package com.test.demo.controller;
import com.test.demo.entity.User;
import com.test.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("showUser/{id}")
public User getUser(@PathVariable Integer id) {
return userService.searchUser(id);
}
@RequestMapping("sayhello")
public String hello() {
return "hello";
}
}
5、service层
service:接口
package com.test.demo.service;
import com.test.demo.entity.User;
public interface UserService {
User searchUser(Integer id);
}
serviceImp：实现service方法
package com.test.demo.service.Imp;
import com.test.demo.entity.User;
import com.test.demo.mapper.UserMapper;
import com.test.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImp implements UserService {
@Autowired
UserMapper userMapper;
@Override
public User searchUser(Integer id) {
return userMapper.searchUser(id);
}
}
6、mapper
需要添加@Mapper注解
package com.test.demo.mapper;
import com.test.demo.entity.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper {
User searchUser(Integer id);
}
7、启动
package com.test.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class TestmappApplication {
public static void main(String[] args) {
SpringApplication.run(TestmappApplication.class, args);
}
}
}
8、数据库 mysql设置
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`password` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`telphone` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, 'name1', '123456', '13637691582');
INSERT INTO `user` VALUES (2, 'name2', '123457', '13625235234');
SET FOREIGN_KEY_CHECKS = 1;
9、浏览器测试
直接获取数据
根据id获取数据