mybatis升级到mybatis-plus

升级plus

mybatis升级到mybatis-plus，两个共存
之前依赖只有mybatis,没有plus
做法：

排除mybatis部门依赖，添加新的plus

修改之后的依赖

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatisplus.version}</version></dependency><!-- SpringBoot集成mybatis框架 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>${mybatis-spring-boot.version}</version><!--原Mybatis中需排除下面2个依赖--><exclusions><exclusion><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId></exclusion><exclusion><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId></exclusion></exclusions></dependency><!-- pagehelper 分页插件 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>${pagehelper.boot.version}</version><!--需排除下面包--><exclusions><exclusion><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId></exclusion></exclusions></dependency>

重点：

更换

//        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();//升级mybatis-plus之后需要替换为这个factory类MybatisSqlSessionFactoryBean sessionFactory=new MybatisSqlSessionFactoryBean();

完整配置代码

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import javax.sql.DataSource;import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.dgp.common.utils.StringUtils;
import org.apache.ibatis.io.VFS;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.util.ClassUtils;/*** Mybatis支持*匹配扫描包* * @author dgp*/
@Configuration
public class MyBatisConfig
{@Autowiredprivate Environment env;static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";/*** 分页插件*/@Beanpublic PaginationInterceptor paginationInterceptor() {return new PaginationInterceptor();}//    /**
//     * 用于解决分页总数问题
//     */
//    @Bean
//    public MybatisPlusInterceptor mybatisPlusInterceptor() {
//        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
//        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
//        return mybatisPlusInterceptor;
//    }public static String setTypeAliasesPackage(String typeAliasesPackage){ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver();MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver);List<String> allResult = new ArrayList<String>();try{for (String aliasesPackage : typeAliasesPackage.split(",")){List<String> result = new ArrayList<String>();aliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX+ ClassUtils.convertClassNameToResourcePath(aliasesPackage.trim()) + "/" + DEFAULT_RESOURCE_PATTERN;Resource[] resources = resolver.getResources(aliasesPackage);if (resources != null && resources.length > 0){MetadataReader metadataReader = null;for (Resource resource : resources){if (resource.isReadable()){metadataReader = metadataReaderFactory.getMetadataReader(resource);try{result.add(Class.forName(metadataReader.getClassMetadata().getClassName()).getPackage().getName());}catch (ClassNotFoundException e){e.printStackTrace();}}}}if (result.size() > 0){HashSet<String> hashResult = new HashSet<String>(result);allResult.addAll(hashResult);}}if (allResult.size() > 0){typeAliasesPackage = String.join(",", (String[]) allResult.toArray(new String[0]));}else{throw new RuntimeException("mybatis typeAliasesPackage 路径扫描错误,参数typeAliasesPackage:" + typeAliasesPackage + "未找到任何包");}}catch (IOException e){e.printStackTrace();}return typeAliasesPackage;}public Resource[] resolveMapperLocations(String[] mapperLocations){ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();List<Resource> resources = new ArrayList<Resource>();if (mapperLocations != null){for (String mapperLocation : mapperLocations){try{Resource[] mappers = resourceResolver.getResources(mapperLocation);resources.addAll(Arrays.asList(mappers));}catch (IOException e){// ignore}}}return resources.toArray(new Resource[resources.size()]);}@Beanpublic SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception{String typeAliasesPackage = env.getProperty("mybatis.typeAliasesPackage");String mapperLocations = env.getProperty("mybatis.mapperLocations");String configLocation = env.getProperty("mybatis.configLocation");typeAliasesPackage = setTypeAliasesPackage(typeAliasesPackage);VFS.addImplClass(SpringBootVFS.class);//        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();//升级mybatis-plus之后需要替换为这个factory类MybatisSqlSessionFactoryBean sessionFactory=new MybatisSqlSessionFactoryBean();sessionFactory.setDataSource(dataSource);sessionFactory.setTypeAliasesPackage(typeAliasesPackage);sessionFactory.setMapperLocations(resolveMapperLocations(StringUtils.split(mapperLocations, ",")));sessionFactory.setConfigLocation(new DefaultResourceLoader().getResource(configLocation));//注意这里，需要引入拦截器才能使分页生效PaginationInterceptor paginationInterceptor = new PaginationInterceptor();sessionFactory.setPlugins(paginationInterceptor);return sessionFactory.getObject();}}

分页插件问题

1.添加plus的插件

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

注入

 @Beanpublic SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception{String typeAliasesPackage = env.getProperty("mybatis.typeAliasesPackage");String mapperLocations = env.getProperty("mybatis.mapperLocations");String configLocation = env.getProperty("mybatis.configLocation");typeAliasesPackage = setTypeAliasesPackage(typeAliasesPackage);VFS.addImplClass(SpringBootVFS.class);//        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();//升级mybatis-plus之后需要替换为这个factory类MybatisSqlSessionFactoryBean sessionFactory=new MybatisSqlSessionFactoryBean();sessionFactory.setDataSource(dataSource);sessionFactory.setTypeAliasesPackage(typeAliasesPackage);sessionFactory.setMapperLocations(resolveMapperLocations(StringUtils.split(mapperLocations, ",")));sessionFactory.setConfigLocation(new DefaultResourceLoader().getResource(configLocation));//注意这里，需要引入拦截器才能使分页生效PaginationInterceptor paginationInterceptor = new PaginationInterceptor();sessionFactory.setPlugins(paginationInterceptor);return sessionFactory.getObject();}