注：该文是本博主记录学习之用，没有太多详细的讲解，敬请谅解！

在日常的开发过程中难免会有批量操作的功能，Mybatis集成Druid批量更新时经常会出现Error updating database. Cause: java.sql.SQLException: sql injection violation, multi-statement not allow 异常。导致该异常出现是因为Druid的multiStatementAllow默认是false，所以需要开启，设置成true。

一、解决方法

1. 配置数据库连接，添加allowMultiQueries=true
2. 配置监控统计拦截的filters，去掉后监控界面sql无法统计，‘wall’用于防火墙，此处去除防火墙
   spring.datasource.druid.filters=config,stat,slf4j
   配置过滤器wall的参数
   spring.datasource.druid.filter.wall.config.multi-statement-allow=true

注：wall是com.alibaba.druid.wall.WallFilter的简称，提供sql的检查和过滤等功能，默认这里会对混合SQL进行拦截，此处为了执行大SQL,可关闭防火墙功能。

如果需要开启wall监控，同时允许multiStatementAllow,就不要在application.yml中配置filter，自己定义。

	@Bean
	@ConfigurationProperties(prefix = “spring.datasource”)
	public DataSource dataSource() {
	
			DruidDataSource druidDataSource = new DruidDataSource();
			List filterList=new ArrayList<>();
			filterList.add(wallFilter());
			druidDataSource.setProxyFilters(filterList);
			return druidDataSource;
	}
	
	@Bean
	public WallFilter wallFilter(){
	
		WallFilter wallFilter=new WallFilter();
		wallFilter.setConfig(wallConfig());
		return wallFilter;
	}
	
	@Bean
	public WallConfig wallConfig(){
		WallConfig config =new WallConfig();
		config.setMultiStatementAllow(true);//允许一次执行多条语句
		config.setNoneBaseStatementAllow(true);//允许非基本语句的其他语句
		return config;
	
	}

注：本文讲解的是基于Springboot，如果是Spring项目请参考官网配置https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE-wallfilter

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dataSourceA.filters=stat,wall,log4j

   druid.filters.default=com.alibaba.druid.filter.stat.StatFilter
    druid.filters.stat=com.alibaba.druid.filter.stat.StatFilter
    druid.filters.mergeStat=com.alibaba.druid.filter.stat.MergeStatFilter
    druid.filters.counter=com.alibaba.druid.filter.stat.StatFilter
    druid.filters.encoding=com.alibaba.druid.filter.encoding.EncodingConvertFilter
    druid.filters.log4j=com.alibaba.druid.filter.logging.Log4jFilter
    druid.filters.slf4j=com.alibaba.druid.filter.logging.Slf4jLogFilter
    druid.filters.commonlogging=com.alibaba.druid.filter.logging.CommonsLogFilter
    druid.filters.commonLogging=com.alibaba.druid.filter.logging.CommonsLogFilter
    druid.filters.wall=com.alibaba.druid.wall.WallFilter
    druid.filters.config=com.alibaba.druid.filter.config.ConfigFilter

dataSourceA.filters=stat,wall,slf4j