We can use setMaxRows(int i) method to limit the number of rows that the database returns from the query. You can achieve the same thing using the SQL query itself. For example, in MySQL, we can use the LIMIT clause to set the max rows that will be returned by the query.
Understanding fetchSize can be tricky, for that you should know how Statement and ResultSet works. When we execute a query in the database, the result is obtained and maintained in the database cache and ResultSet is returned. ResultSet is the cursor that has the reference to the result in the database.
Let’s say we have a query that returns 100 rows and we have set fetchSize to 10, so in every database trip JDBC driver will fetch only 10 rows and hence there will be 10 trips to fetch all the rows. Setting optimal fetchSize is helpful when you need a lot of processing time for each row and number of rows in the result is huge.
We can set fetchSize through Statement object but it can be overridden through ResultSet object setFetchSize() method.
Posted Date:- 2021-09-04 05:31:30
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