springboot 使用tk.mybatis要注意

一、pom.xml文件要引两个tk依赖

<dependency>
			<groupId>tk.mybatis</groupId>
			<artifactId>mapper</artifactId>
			<version>4.1.2</version>
		</dependency>
		<dependency>
			<groupId>tk.mybatis</groupId>
			<artifactId>mapper-spring-boot-starter</artifactId>
			<version>2.1.5</version>
		</dependency>

二、要注意的是入口文件的mapperscan要用tk.mybatis.spring.annotation.MapperScan，如下所示

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

//import org.mybatis.spring.annotation.MapperScan;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan(basePackages = "com.example.demo.entity")
public class Demo1Application {

	public static void main(String[] args) {
		SpringApplication.run(Demo1Application.class, args);
	}

}

三、写实体类时要加@Id注解，告诉tk主键是什么

package com.example.demo.model;

import javax.persistence.Id;

public class User {
    @Id private Integer id;

    private String name;

    private Integer age;

    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 Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

四、用tk后可以不写对应的mapper.xml文件