一、添加mybatis-plus依赖、删除mybatis依赖

根目录下的pom文件

更改前：

           <!-- SpringBoot集成mybatis框架 -->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis-spring-boot.version}</version>
            </dependency>

            <!-- pagehelper 分页插件 -->
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>${pagehelper.boot.version}</version>
            </dependency>

更改后

            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.3.2</version>
            </dependency>

            <!-- pagehelper 分页插件 -->
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>${pagehelper.boot.version}</version>
                <exclusions>
                    <exclusion>
                        <artifactId>mybatis-spring</artifactId>
                        <groupId>org.mybatis</groupId>
                    </exclusion>
                    <exclusion>
                        <artifactId>mybatis</artifactId>
                        <groupId>org.mybatis</groupId>
                    </exclusion>
                </exclusions>
            </dependency>

在ruoyi-common模块pom.xml需要添加mymatis-plus

 <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>

二、修改MyBatis配置

在ruoyi-admin模块src\main\resources\application.yml

# MyBatis配置
#mybatis:
#    # 搜索指定包别名
#    typeAliasesPackage: com.ruoyi.**.domain
#    # 配置mapper的扫描，找到所有的mapper.xml映射文件
#    mapperLocations: classpath*:mapper/**/*Mapper.xml
#    # 加载全局的配置文件
#    configLocation: classpath:mybatis/mybatis-config.xml

mybatis-plus:
  type-aliases-package: com.ruoyi.**.domain
  mapper-locations: classpath*:mapper/**/*Mapper.xml
  config-location: classpath:mybatis/mybatis-config.xml

三、修改代码

在ruoyi-framework模块

src\main\java\com\ruoyi\framework\config\MyBatisConfig.java

注释掉 //@Configuration，或者删除掉这个类，

新加MybatisPlusConfig.java

package com.ruoyi.framework.config;

import com.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
@MapperScan("com.ruoyi.**.mapper")
public class MybatisPlusConfig {
    /**
     * 分页插件
     * @return
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
        // paginationInterceptor.setOverflow(false);
        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        // paginationInterceptor.setLimit(500);
        return paginationInterceptor;
    }

    /**
     * 乐观锁插件
     * @return
     */
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }

}

4.mapper service 继承mybatis-plus

• mapper

public interface SysConfigMapper extends BaseMapper<SysConfig>{
}

• service

@Service
public class SysConfigServiceImpl extends ServiceImpl<SysConfigMapper, SysConfig> implements ISysConfigService{
}

1. 测试

2.