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package javax.sql;

import java.sql.*;


An object that implements the RowSetWriter interface, called a writer. A writer may be registered with a RowSet object that supports the reader/writer paradigm. 
 If a disconnected RowSet object modifies some of its data, and it has a writer associated with it, it may be implemented so that it calls on the writer's writeData method internally to write the updates back to the data source. In order to do this, the writer must first establish a connection with the rowset's data source. 

If the data to be updated has already been changed in the data source, there
is a conflict, in which case the writer will not write
the changes to the data source.  The algorithm the writer uses for preventing
or limiting conflicts depends entirely on its implementation.

Since:1.4
/**
 * An object that implements the {@code RowSetWriter} interface,
 * called a <i>writer</i>. A writer may be registered with a {@code RowSet}
 * object that supports the reader/writer paradigm.
 * <P>
 * If a disconnected {@code RowSet} object modifies some of its data,
 * and it has a writer associated with it, it may be implemented so that it
 * calls on the writer's {@code writeData} method internally
 * to write the updates back to the data source. In order to do this, the writer
 * must first establish a connection with the rowset's data source.
 * <P>
 * If the data to be updated has already been changed in the data source, there
 * is a conflict, in which case the writer will not write
 * the changes to the data source.  The algorithm the writer uses for preventing
 * or limiting conflicts depends entirely on its implementation.
 *
 * @since 1.4
 */

public interface RowSetWriter {

  
Writes the changes in this RowSetWriter object's rowset back to the data source from which it got its data. 
Params:
  • caller – the RowSet object (1) that has implemented the RowSetInternal interface, (2) with which this writer is registered, and (3) that called this method internally
Throws:
Returns:true if the modified data was written; false if not, which will be the case if there is a conflict
/**
   * Writes the changes in this {@code RowSetWriter} object's
   * rowset back to the data source from which it got its data.
   *
   * @param caller the {@code RowSet} object (1) that has implemented the
   *         {@code RowSetInternal} interface, (2) with which this writer is
   *        registered, and (3) that called this method internally
   * @return {@code true} if the modified data was written; {@code false}
   *          if not, which will be the case if there is a conflict
   * @throws SQLException if a database access error occurs
   */
  boolean writeData(RowSetInternal caller) throws SQLException;

}