SpringBoot项目将mybatis升级为mybatis-plus的方法

 <!-- 注释掉原来的mybatis，否则可能会报错 -->
<!--        <dependency>-->
<!--            <groupId>org.mybatis.spring.boot</groupId>-->
<!--            <artifactId>mybatis-spring-boot-starter</artifactId>-->
<!--        </dependency>-->
<!-- 引入 mybatis-plus 的包 -->
  <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-extension</artifactId>
      <version>3.4.1</version>
      <scope>compile</scope>
  </dependency>
  <!-- 引入 generator，代码生成器需要用到，如果不用代码生成器则不需要引入 -->
  <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-generator</artifactId>
      <version>3.4.1</version>
  </dependency>
  <!-- 引入 freemarker -->
  <dependency>
      <groupId>org.freemarker</groupId>
      <artifactId>freemarker</artifactId>
  </dependency>

import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import com.baomidou.mybatisplus.core.config.GlobalConfig;
import com.baomidou.mybatisplus.extension.incrementer.OracleKeyGenerator;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.github.pagehelper.PageInterceptor;
import org.apache.ibatis.io.VFS;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.sql.DataSource;


/**
 * @author javaer
 * @date 2021/11/11 13:35
 **/
@Configuration
//扫描的mapper文件夹地址
@MapperScan(basePackages = {"cn.com.anzhiyi.exam.mapper"})
//开启注解事务管理
@EnableTransactionManagement
public class MybatisPlusConfig {

    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

    /**
     * pagehelper的分页插件
     */
    @Bean
    public PageInterceptor pageInterceptor() {
        return new PageInterceptor();
    }

    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
        String mapperLocations = "classpath:mapper/*.xml";
        VFS.addImplClass(SpringBootVFS.class);
        final MybatisSqlSessionFactoryBean sessionFactory = new MybatisSqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        // 配置组件生成策略
        sessionFactory.setGlobalConfig(globalConfig());
        return sessionFactory.getObject();
    }

    @Bean
    public GlobalConfig globalConfig() {
        GlobalConfig conf = new GlobalConfig();
        conf.setDbConfig(new GlobalConfig.DbConfig().setKeyGenerator(new OracleKeyGenerator()));
        return conf;
    }

}

# mybatis配置
# mybatis:  //将原先的mybatis注释掉，调整为 mybatis-plus 即可
mybatis-plus:
  type-aliases-package: cn.com.anzhiyi.exam.api.module
  configuration:
    # 驼峰转换
    map-underscore-to-camel-case: true
    # 延迟加载
    lazy-loading-enabled: true
  mapper-locations: classpath:mapper/*.xml