Java result set fetch size

2020-03-29 03:29

Moving the Cursor in a Scrollable Result Set: 23. Getting the Cursor Position in a Scrollable Result Set: 24. Getting the Number of Rows in a Table Using a Scrollable Result Set: 25. Create an insensitive scrollable result set: 26. Create a sensitive scrollable result setJun 21, 2015 JDBC fetch size parameter can significantly reduce the result set fetching time. It can be set on any Statement or PreparedStatement object. Many frameworks like Spring or Hibernate give you very convenient API to do this. java result set fetch size

Demos and Usage of Java 1: import java. io. IOException; 2: import java. sql

The fetch size is the number of rows that should be retrieved from the database in each roundtrip. It has nothing to do with the number of rows returned. What you should do is call rs. next() iff your query didn't return any rows it will return false. Fetch Size. Fetch size is also used in a result set. When the statement object executes a query, the fetch size of the statement object is passed to the result set object produced by the query. However, you can also set the fetch size in the result set object to override the statement fetch size that was passed to it.java result set fetch size If the fetch size specified is zero, the JDBC driver ignores the value and is free to make its own best guess as to what the fetch size should be. The default value

The result set fetch size, either set explicitly, or by default equal to the statement fetch size that was passed to it, determines the number of rows that are retrieved java result set fetch size An int indicating the number of rows to fetch. Exceptions. SQLServerException. Remarks. This setFetchSize method is specified by the setFetchSize method in the java. sql. ResultSet interface. If the fetch size specified is zero, the JDBC driver ignores the value and estimates what the fetch size should be. UPDATE. As someone has posted below, I am pulling back result sets in the hundreds of millions, so 30 or 200 is nowhere near the right answer for correct fetch size based on my tests. At the moment my fetch size is 10, 000, 000 but there is no way for me to validate that the database is using the size of 10 million. Fetch Size. By default, when Oracle JDBC runs a query, it retrieves a result set of 10 rows at a time from the database cursor. This is the default Oracle row fetch size value. You can change the number of rows retrieved with each trip to the database cursor by changing the row fetch size value. I want to know the result set size BEFORE processing the results because I need to make an array of the same size beforehand. And, as noted in other answers, scanning all rows twice won't always work.

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