[GitHub] [incubator-shardingsphere] beiwangnull commented on issue #3083: After the service restarts, the request is time-consuming in a short time

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beiwangnull commented on issue #3083: After the service restarts, the request is time-consuming in a short time
URL: https://github.com/apache/incubator-shardingsphere/issues/3083#issuecomment-553292217
 
 
   @terrymanu @zcjhwl   It's going to be faster
   
   @Component
   public class PreHeating implements InitializingBean {
       @Override
       public void afterPropertiesSet() throws Exception {
           Collection<DatabaseType> databaseTypes = SQLParserFactory.getAddOnDatabaseTypes();
           for (DatabaseType databaseType:databaseTypes){
               if("MySQL".equals(databaseType.getName())){
                   SQLParseEngine parseEngine = SQLParseEngineFactory.getSQLParseEngine(databaseType);
                   parseEngine.parse("select 'X'",true);
                   MySQLParser mySQLParser = (MySQLParser)SQLParserFactory.newInstance(databaseType,"select 'X'");
                   mySQLParser.execute();
               }
           }
       }
   

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