SpringBoot學習筆記（八）- 整合Mybatis

1. 添加依賴
   pom.xml文件中添加一下依賴;

 <!--mysql依賴 -->
    <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
    </dependency>
    
    <!--mybatis依賴 -->
    <dependency>
         <groupId>org.mybatis.spring.boot</groupId>
         <artifactId>mybatis-spring-boot-starter</artifactId>
         <version>1.1.1</version>
    </dependency>
    <!--好像不引入測試依賴pom.xml會報錯 -->
    <dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
    </dependency>

2. 配置application.properties文件

useSSL=false是在JDBC版本與MySQL版本不兼容時需要加上的，true或false都試一下，看可不可用
https://blog.csdn.net/UIYOOOO/article/details/80301411

#連接mysql
spring.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3. 創建entity實體類

@Data等於@Setter+@Getter

package com.gxl.gree.entity;

import lombok.Data;

@Data
public class User {
	private Integer id;
	private String username;
	private String password;
}

4. 創建DAO層的mapper類
   @Mapper 可不寫，直接在啓動類上加:
   @MapperScan(basePackages={“com.gxl.gree.mapper”})

package com.gxl.gree.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.gxl.gree.entity.User;
//@Mapper 
public interface UserMapper {
	@Select("SELECT * FROM USER WHERE USERNAME = #{username}")
	List<User> findByName(@Param("username") String username);
	
	@Insert("INSERT INTO USER(USERNAME, PASSWORD) VALUES(#{username}, #{password})")
	int insert(@Param("username") String username, @Param("password") String password);
}

5. 創建Service類

package com.gxl.gree.service;

import java.util.List;

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

import com.gxl.gree.entity.User;
import com.gxl.gree.mapper.UserMapper;

@Service
public class UserService implements UserMapper {

	@Autowired
	private UserMapper userMapper;
	
	@Override
	public List<User> findByName(String username) {
		// TODO Auto-generated method stub
		List<User> user = userMapper.findByName(username);
		return user;
	}

	@Override
	public int insert(String username, String password) {
		// TODO Auto-generated method stub
		int resultNum = userMapper.insert(username, password);
		return resultNum;
	}
	
}

6. 調用Controller

@RequestMapping("/userChart")
	public String userChart(){
		int resultNum = userService.insert("taxianwoshuai", "qwe123");
		List<User> userlist = userService.findByName("taxianwoshuai");
		log.info("新增"+resultNum+"條數據: "+userlist);
		return "新增"+resultNum+"條數據: "+userlist;
		
	}

注：整合Mybatis過程中，SpringBoot2.0版本後的寫法和1.5的不一致