Update connector-java-ch.md

documentation20/webdocs/markdowndocs/connector-java-ch.md

@@ -334,16 +334,16 @@ conn.close();
 ```java
  public static void main(String[] args) throws SQLException {
     HikariConfig config = new HikariConfig();
+    // jdbc properties
     config.setJdbcUrl("jdbc:TAOS://127.0.0.1:6030/log");
     config.setUsername("root");
     config.setPassword("taosdata");
-
+    // connection pool configurations
     config.setMinimumIdle(3);           //minimum number of idle connection
     config.setMaximumPoolSize(10);      //maximum number of connection in the pool
-    config.setConnectionTimeout(10000); //maximum wait milliseconds for get connection from pool
-    config.setIdleTimeout(60000);       // max idle time for recycle idle connection
-    config.setConnectionTestQuery("describe log.dn"); //validation query
-    config.setValidationTimeout(3000);   //validation query timeout
+    config.setConnectionTimeout(30000); //maximum wait milliseconds for get connection from pool
+    config.setIdleTimeout(0);       // max idle time for recycle idle connection
+    config.setConnectionTestQuery("select server_status()"); //validation query
 
     HikariDataSource ds = new HikariDataSource(config); //create datasource
 
@@ -376,25 +376,17 @@ conn.close();
 ```java
 public static void main(String[] args) throws Exception {
     Properties properties = new Properties();
+    // jdbc properties
     properties.put("driverClassName","com.taosdata.jdbc.TSDBDriver");
     properties.put("url","jdbc:TAOS://127.0.0.1:6030/log");
     properties.put("username","root");
     properties.put("password","taosdata");
-
+    // pool configurations
     properties.put("maxActive","10"); 	//maximum number of connection in the pool
-    properties.put("initialSize","3");//initial number of connection
-    properties.put("maxWait","10000");//maximum wait milliseconds for get connection from pool
-    properties.put("minIdle","3");//minimum number of connection in the pool
-
-    properties.put("timeBetweenEvictionRunsMillis","3000");// the interval milliseconds to test connection
-
-    properties.put("minEvictableIdleTimeMillis","60000");//the minimum milliseconds to keep idle
-    properties.put("maxEvictableIdleTimeMillis","90000");//the maximum milliseconds to keep idle
-
-    properties.put("validationQuery","describe log.dn"); //validation query
-    properties.put("testWhileIdle","true"); // test connection while idle
-    properties.put("testOnBorrow","false"); // don't need while testWhileIdle is true
-    properties.put("testOnReturn","false"); // don't need while testWhileIdle is true
+    properties.put("initialSize","3");	//initial number of connection
+    properties.put("minIdle","3");	//minimum number of connection in the pool
+    properties.put("maxWait","30000");	//maximum wait milliseconds for get connection from pool
+    properties.put("validationQuery","select server_status()"); //validation query
 
     //create druid datasource
     DataSource ds = DruidDataSourceFactory.createDataSource(properties);