如何故意延迟jdbc prepareStatement的executeQuery（）？

Question

It is mentioned in the Java API docs that Statement interface has setQueryTimeOut method. And I did use it with PreparedStatement. Now unfortunately I am not able to confirm that it is indeed working. I have set it to 1s which is minimum like below:

pstmt = connection.prepareStatement(sqlQuery);
pstmt.setString(1, age);
pstmt.setQueryTimeout(1);
resultSet = pstmt.executeQuery();

Query is simple Select query from a view based on age. But Db response has become better and execution of query is getting completed within 500ms. How to intentionally delay the execution of query so that SQLException which will be thrown by setQueryTimeOut method will be caught?

Answer 1

You can pause via TimeUnit class which is java.util.concurrent package .

TimeUnit.SECONDS.sleep(1);

To sleep for one second or

TimeUnit.MINUTES.sleep(1);

To sleep for a minute.

Implement in this way

pstmt = connection.prepareStatement(sqlQuery);
pstmt.setString(1, age);
TimeUnit.MINUTES.sleep(1);
resultSet = pstmt.executeQuery();

On a fine note sleep method throws InterruptedException exception so you have to take care of that.

Also if you don't want an overhead of TimeUnit class just simply call Thead.sleep(long) in your code in below manner.

pstmt = connection.prepareStatement(sqlQuery);
pstmt.setString(1, age);
Thread.sleep(60);
resultSet = pstmt.executeQuery();

But again you have to take care of InterruptedException which sleep method throws.