[TD-2404]<fix>: fix connection invalid using hikariCP

tests/examples/JDBC/connectionPools/src/main/java/com/taosdata/demo/ConnectionPoolDemo.java

@@ -84,7 +84,7 @@ public class ConnectionPoolDemo {
 
         ExecutorService executor = Executors.newFixedThreadPool(threadCount);
         while (true) {
-            executor.execute(new InsertTask(dataSource, dbName, tableSize, batchSize));
+//            executor.execute(new InsertTask(dataSource, dbName, tableSize, batchSize));
             if (sleep > 0)
                 TimeUnit.MILLISECONDS.sleep(sleep);
         }

tests/examples/JDBC/connectionPools/src/main/java/com/taosdata/demo/pool/HikariCpBuilder.java

@@ -14,8 +14,17 @@ public class HikariCpBuilder {
         config.setUsername("root");
         config.setPassword("taosdata");
 
-        config.setMaximumPoolSize(poolSize);
-        config.setMinimumIdle(poolSize);
+//        config.setMaximumPoolSize(poolSize);
+//        config.setMinimumIdle(poolSize);
+        config.setMaximumPoolSize(200);
+        config.setMinimumIdle(50);
+        config.setConnectionTestQuery("show dnodes");
+
+        config.setIdleTimeout(60000);
+        config.setConnectionTimeout(60000);
+        config.setValidationTimeout(3000);
+        config.setMaxLifetime(60000);
+
         HikariDataSource ds = new HikariDataSource(config);
         return ds;
     }