org.springframework.jdbc.core
Class RowCountCallbackHandler

public class RowCountCallbackHandler

implements RowCallbackHandler

Implementation of RowCallbackHandler. Convenient superclass for callback handlers. An instance can only be used once.

We can either use this on its own (for example, in a test case, to ensure that our result sets have valid dimensions), or use it as a superclass for callback handlers that actually do something, and will benefit from the dimension information it provides.

Author:

Rod Johnson

Version: $Id: RowCountCallbackHandler.java,v 1.2 2004/01/02 22:00:54 jhoeller Exp $

Since: May 3, 2001

public final int getColumnCount()

Return the number of columns in this result set. Valid once we've seen the first row, so subclasses can use it during processing

Returns: the number of columns in this result set

public final String[] getColumnNames()

Return the names of the columns. Valid after processRow is invoked the first time.

Returns: the names of the columns. Indexed from 0 to n-1.

public final int[] getColumnTypes()

Return the types of the columns as java.sql.Types constants Valid after processRow is invoked the first time.

Returns: the types of the columns as java.sql.Types constants. Indexed from 0 to n-1.

public final int getRowCount()

Return the row count of this ResultSet Only valid after processing is complete

Returns: the number of rows in this ResultSet

public final void processRow(ResultSet rs)
                       throws java.sql.SQLException

Implementation of ResultSetCallbackHandler. Work out column size if this is the first row,* otherwise just count rows.

Subclasses can perform custom extraction or processing by overriding the processRow(ResultSet, int) method.

Association Links

to Class java.lang.String