原因：Druid的防火墙配置(WallConfig)中变量multiStatementAllow默认为false；

解决方案：设置Druid的防火墙配置(WallConfig)中变量multiStatementAllow=true，新建DruidDataSource配置类

配置类代码：

@Configuration
public class DataSourceConfig {

    @Autowired
    WallFilter wallFilter;

    @Bean    //声明其为Bean实例
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource(){
        DruidDataSource datasource = new DruidDataSource();

        // filter
        List<Filter> filters = new ArrayList<>();
        filters.add(wallFilter);
        datasource.setProxyFilters(filters);

        return datasource;
    }

    @Bean(name = "wallFilter")
    @DependsOn("wallConfig")
    public WallFilter wallFilter(WallConfig wallConfig){
        WallFilter wallFilter = new WallFilter();
        wallFilter.setConfig(wallConfig);
        return wallFilter;
    }

    @Bean(name = "wallConfig")
    public WallConfig wallConfig(){
        WallConfig wallConfig = new WallConfig();
        wallConfig.setMultiStatementAllow(true);//允许一次执行多条语句
        wallConfig.setNoneBaseStatementAllow(true);//允许一次执行多条语句
        return wallConfig;
    }

}

然后修改sql连接url路径：声明allowMultiQueries=true；参考路径方式：

url: jdbc:mysql://localhost:3306/ies? allowMultiQueries=true&autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=CONVERT_TO_NULL&useSSL=false&serverTimezone=Hongkong

就此，问题解决。