概述

tkmybatis的主要作用就是让我们不需要在手动写简单的CRUD sql语句了，复杂的sql肯定还是避免不了手写的。

pom文件配置

<?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>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.practice</groupId>
    <artifactId>tkmybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>tkmybatis</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- tkmybatis -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.1.5</version>
        </dependency>
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
            <version>4.1.5</version>
        </dependency>

        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

测试环境配置

application.properties

#tomcat port
server.port=8080
#datasource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://ip:port/database?allowMultiQueries=true&useUnicode=true&useSSL=false&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull
spring.datasource.username=xxx
spring.datasource.password=xxx
#logging
#TkMybatis
mybatis.mapper-locations=classpath*:mapper/*.xml

controller层编写

package com.practice.tkmybatis.controller;

import com.practice.tkmybatis.dao.UserEntity;
import com.practice.tkmybatis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

/**
 * @Description : 测试tkmybatis功能
 * @Author : asus
 * @Version : xxx
 * @Date : 2021/6/8 22:38
 */
@Controller
public class UserController {
    @Autowired
    private UserService userService;

    public UserEntity findById(int id) {
        UserEntity entity = userService.findById(id);
        System.out.println(entity);
        return entity;
    }

    public void insertUser() {
        UserEntity userEntity = UserEntity.builder().id(1).name("张三").age(18).build();
        userService.insert(userEntity);
    }
}

dao层编写

package com.practice.tkmybatis.dao;

import lombok.Builder;
import lombok.Data;
import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;

/**
 * @Description : user实体类
 * @Author : asus
 * @Version : xxx
 * @Date : 2021/6/8 22:41
 */
@Data
@Builder
@Table(name = "test_user")
public class UserEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    private Integer id;

    private String name;

    private String sex;

    private Integer age;

    private String address;

    private String phone;
}

service层编写

package com.practice.tkmybatis.service;

import com.practice.tkmybatis.dao.UserEntity;
import java.util.List;

/**
 * @Description : user服务接口
 * @Author : asus
 * @Version : xxx
 * @Date : 2021/6/8 23:12
 */
public interface UserService {
    UserEntity findById(int id);

    List<UserEntity> findAll();

    void insert(UserEntity user);

    void update(UserEntity user);

    void delete(UserEntity user);
}

package com.practice.tkmybatis.service.impl;

import com.practice.tkmybatis.dao.UserEntity;
import com.practice.tkmybatis.mapper.UserMapper;
import com.practice.tkmybatis.service.UserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * @Description : user service 实现类
 * @Author : asus
 * @Version : xxx
 * @Date : 2021/6/8 23:16
 */
@Service
public class UserServiceImpl implements UserService {
    @Resource
    private UserMapper userMapper;

    @Override
    public UserEntity findById(int id) {
        return userMapper.selectByPrimaryKey(1);
    }

    @Override
    public List<UserEntity> findAll() {
        return null;
    }

    @Override
    public void insert(UserEntity user) {
        userMapper.insertSelective(user);
    }

    @Override
    public void update(UserEntity user) {

    }

    @Override
    public void delete(UserEntity user) {

    }
}

mapper层编写

重点来了，这里mapper继承tkmybatis中的Mapper接口，我们可以做到不写任何sql语句就可以完成简单增删改查操作。

package com.practice.tkmybatis.mapper;

import com.practice.tkmybatis.dao.UserEntity;
import tk.mybatis.mapper.common.Mapper;
/**
 * @Description : user mapper类
 * @Author : asus
 * @Version : xxx
 * @Date : 2021/6/8 23:12
 */
@org.apache.ibatis.annotations.Mapper
public interface UserMapper extends Mapper<UserEntity> {
}

测试

package com.practice.tkmybatis;

import com.practice.tkmybatis.controller.UserController;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class TkmybatisApplicationTests {

    @Autowired
    private UserController controller;

    @Test
    public void testInsertUser() {
        controller.insertUser();
    }
}