How Do I Determine the Size of a java.sql.ResultSet?

Finding the Size of a java.sql.ResultSet

While retrieving data using a java.sql.ResultSet, determining its size becomes crucial for various reasons. Despite the absence of a dedicated size() or length() method, several approaches can be adopted to effectively ascertain the number of rows in a ResultSet.

One technique involves executing a "SELECT COUNT(*)" query on the underlying table. This query returns the total number of rows, providing an accurate count.

Another method relies on the ResultSet's cursor functionality. By moving the cursor to the last row using rs.last() and then retrieving the row id using rs.getRow(), one can obtain the row count. This approach is preferred when the underlying table is large, as it avoids iterating through all the rows.

By utilizing either of these methods, developers can efficiently determine the size of a ResultSet without the need for explicit size-related methods. This knowledge empowers them to optimize data retrieval and manipulation tasks effectively.

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