1、添加依赖
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>2.1.5</version>
</dependency>
2、启动类换注解
MapperScan使用tkmapper的
import tk.mybatis.spring.annotation.MapperScan;
@MapperScan("xxxx.dao")

3、创建generalDao，此dao会配置在generatorConfig.xml中
package com.yogo.general;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface GeneralDao<T> extends Mapper<T>, MySqlMapper<T> {
}

4、创建配置文件generatorConfig.xml
我用的springboot2.7会报错，逆向生成了很多系统表，在jdbcConnection标签中添加以下代码： <property name="nullCatalogMeansCurrent" value="true"/>
以下为generatorConfig.xml完整代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
<context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
<property name="beginningDelimiter" value=""/> <property name="endingDelimiter" value=""/>

    <!-- 配置 GeneralDAO -->
    <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
        <property name="mappers" value="com.yogo.general.GeneralDao"/>
    </plugin>

    <!-- 配置数据库连接 -->
    <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                    connectionURL="jdbc:mysql://localhost:3306/fmmall"
                    userId="root" password="root1111">
        <!-- 解决逆向结果重复问题-->
        <property name="nullCatalogMeansCurrent" value="true"/>
    </jdbcConnection>

    <!-- 配置实体类存放路径 -->
    <javaModelGenerator targetPackage="com.yogo.beans" targetProject="src/main/java"/>

    <!-- 配置 XML 存放路径 -->
    <sqlMapGenerator targetPackage="/" targetProject="src/main/resources/mappers"/>

    <!-- 配置 DAO 存放路径 -->
    <javaClientGenerator targetPackage="com.yogo.dao" targetProject="src/main/java" type="XMLMAPPER"/>

    <!-- 配置需要指定生成的数据库和表，% 代表所有表 -->
    <table tableName="%"></table>

</context>
</generatorConfiguration>

5、添加逆向插件
<build>
<plugins>
<plugin>

<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>

<configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
</configuration>
<dependencies>

<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.32</version>
</dependency>

              <!--逆向需要的tkmapper依赖-->  <dependency>
                    <groupId>tk.mybatis</groupId>
                    <artifactId>mapper</artifactId>
                    <version>3.4.4</version>
                </dependency>

            </dependencies>
        </plugin>
    </plugins>
</build>

6、使用tkmapper
以下为tkmapper部分代码
Example example = new Example(Users.class);
Example.Criteria criteria = example.createCriteria();
criteria.andEqualTo("username",username);
List<Users> users = userDao.selectByExample(example);

以注册为例
@Transactional
@Override
public ResultVO register(String username, String password) {
synchronized (this){
Example example = new Example(Users.class);
Example.Criteria criteria = example.createCriteria();
criteria.andEqualTo("username",username);
List<Users> users = userDao.selectByExample(example);
if (users.size() == 0){
Users user = new Users();
user.setUsername(username);
user.setPassword(password);
user.setUserImg("img/defaultImg.png");
Date currentDate = new Date();
user.setUserRegtime(currentDate);
user.setUserModtime(currentDate);
int i = userDao.insertUseGeneratedKeys(user);
if (i>0){
return new ResultVO(10000,"注册成功",user);
}else {
return new ResultVO(10002,"注册失败",user);
}
}else {
return new ResultVO(10001,"用户名已经存在",null);
}
}
}