MyBatis-Plus - 一篇带你解决自定义 SQL 注入器失效必杀技

问题分析

Invalid bound statement (not found)

如果你看到这一篇，说明你也是遇到这个问题的人（废话），我们在上一篇（​​MyBatis-Plus - 一篇带你玩转自定义 BaseMapper​​）讲解过程当中，会发现最后用的是 @Component 注解进入注入到 Spring 容器，或者说有的地方采用 @Bean 的方式进行注入（半斤八两），但奇怪的是始种没生效，因为…

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import org.springframework.stereotype.Component;
import java.util.List;
 
/**
 * @author Lux Sun
 * @date 2022/1/14
 */
@Component
public class DSqlInjector extends DefaultSqlInjector {
 
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
        List<AbstractMethod> methodList = super.getMethodList(mapperClass);
        methodList.add(new DeletePhysically());
        return methodList;
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class MyConfiguration {
 
  @Bean
  public DSqlInjector sqlInjector() {
    return new DSqlInjector();
  }
}

解决方案

因为啥？如果在你没有犯了一些基础的错误情况下（比如：注解包没扫到啥啥啥的），那么你很有可能是因为使用自定义SqlSessionFactory，不会初始化刚开始自定义的 SQL 注入器了，知道这个基本问题就解决了，把集成项目的 SqlSessionFactory 去掉，或者加上 GlobalConfig 初始化这一块的代码“globalConfig.setSqlInjector(new DSqlInjector());”。

@Bean
@DependsOn({"springCtxUtil"})
public MybatisSqlSessionFactoryBean sqlSessionFactoryBean() throws Exception {
    MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
    // basic config
    String logicNotDeleteValue = "", logicDeleteValue = "", metaObjectHandler = "" , typeEnumsPackage = "",typeHandlersPackage = "";
    if (null != dynamicDataSourceProperties.getGlobalConfig()) {
        logicNotDeleteValue = dynamicDataSourceProperties.getGlobalConfig().getLogicNotDeleteValue();
        logicDeleteValue = dynamicDataSourceProperties.getGlobalConfig().getLogicDeleteValue();
        metaObjectHandler = dynamicDataSourceProperties.getGlobalConfig().getMetaObjectHandler();
        typeEnumsPackage= dynamicDataSourceProperties.getGlobalConfig().getTypeEnumsPackage();
        typeHandlersPackage= dynamicDataSourceProperties.getGlobalConfig().getTypeHandlersPackage();
    }
    MybatisConfiguration configuration = new MybatisConfiguration();
    GlobalConfig globalConfig = GlobalConfigUtils.defaults();
    GlobalConfig.DbConfig dbConfig = new GlobalConfig.DbConfig();
    globalConfig.setDbConfig(dbConfig);
    //【看到了吗？我在这呢！】
    globalConfig.setSqlInjector(new DSqlInjector());

    if (!StringUtils.isEmpty(metaObjectHandler)) {
        MetaObjectHandler metaObjectHandlerBean = (MetaObjectHandler) Class.forName(metaObjectHandler).newInstance();
        globalConfig.setMetaObjectHandler(metaObjectHandlerBean);
    }

    if (!StringUtils.isEmpty(logicDeleteValue)) {
        dbConfig.setLogicDeleteValue(logicDeleteValue);
    }

    if (!StringUtils.isEmpty(logicNotDeleteValue)) {
        dbConfig.setLogicNotDeleteValue(logicNotDeleteValue);
    }

    if (null != dynamicDataSourceProperties.getGlobalConfig() && null != dynamicDataSourceProperties.getGlobalConfig().getDefaultEnumTypeHandler()){
        configuration.setDefaultEnumTypeHandler(dynamicDataSourceProperties.getGlobalConfig().getDefaultEnumTypeHandler());
    }

    if (!StringUtils.isEmpty(typeEnumsPackage)){
        sqlSessionFactory.setTypeEnumsPackage(typeEnumsPackage);
    }

    if (!StringUtils.isEmpty(typeHandlersPackage)){
        sqlSessionFactory.setTypeHandlersPackage(typeHandlersPackage);
    }

    configuration.setCacheEnabled(false);
    sqlSessionFactory.setConfiguration(configuration);
    sqlSessionFactory.setGlobalConfig(globalConfig);

    // 使分页插件生效
    PaginationInterceptor paginationInterceptor = (PaginationInterceptor) SpringCtxUtil.getBean("paginationInterceptor");
    if (null != paginationInterceptor) {
        sqlSessionFactory.setPlugins(new Interceptor[]{paginationInterceptor});
    }

    // 配置数据源，此处配置为关键配置，如果没有将 dynamicDataSource 作为数据源则不能实现切换
    sqlSessionFactory.setDataSource(dynamicDataSource());

    // 扫描Model
    String typeAliasesPackage = dynamicDataSourceProperties.getTypeAliasesPackage();
    if (!StringUtils.isEmpty(typeAliasesPackage)) {
        sqlSessionFactory.setTypeAliasesPackage(typeAliasesPackage);
    }

    // 扫描映射文件
    String mapperLocations = dynamicDataSourceProperties.getMapperLocations();
    if (!StringUtils.isEmpty(mapperLocations)) {
        sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
    }

    return sqlSessionFactory;
}