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package javax.sql;

import java.sql.*;


The facility that a disconnected RowSet object calls on
to populate itself with rows of data. A reader (an object implementing the
RowSetReader interface) may be registered with
a RowSet object that supports the reader/writer paradigm.
When the RowSet object's execute method is
called, it in turn calls the reader's readData method.

Since:1.4
/**
 * The facility that a disconnected <code>RowSet</code> object calls on
 * to populate itself with rows of data. A reader (an object implementing the
 * <code>RowSetReader</code> interface) may be registered with
 * a <code>RowSet</code> object that supports the reader/writer paradigm.
 * When the <code>RowSet</code> object's <code>execute</code> method is
 * called, it in turn calls the reader's <code>readData</code> method.
 *
 * @since 1.4
 */

public interface RowSetReader {

  
Reads the new contents of the calling RowSet object.
In order to call this method, a RowSet
object must have implemented the RowSetInternal interface
and registered this RowSetReader object as its reader.
The readData  method is invoked internally
by the RowSet.execute method for rowsets that support the
reader/writer paradigm.

The readData method adds rows to the caller.
It can be implemented in a wide variety of ways and can even
populate the caller with rows from a nonrelational data source.
In general, a reader may invoke any of the rowset's methods,
with one exception. Calling the method execute will
cause an SQLException to be thrown
because execute may not be called recursively.  Also,
when a reader invokes RowSet methods, no listeners
are notified; that is, no RowSetEvent objects are
generated and no RowSetListener methods are invoked.
This is true because listeners are already being notified by the method
execute.

Params:
  • caller – the RowSet object (1) that has implemented the
        RowSetInternal interface, (2) with which this reader is
       registered, and (3) whose execute method called this reader
Throws:
  • SQLException – if a database access error occurs or this method
           invokes the RowSet.execute method
/**
   * Reads the new contents of the calling <code>RowSet</code> object.
   * In order to call this method, a <code>RowSet</code>
   * object must have implemented the <code>RowSetInternal</code> interface
   * and registered this <code>RowSetReader</code> object as its reader.
   * The <code>readData</code>  method is invoked internally
   * by the <code>RowSet.execute</code> method for rowsets that support the
   * reader/writer paradigm.
   *
   * <P>The <code>readData</code> method adds rows to the caller.
   * It can be implemented in a wide variety of ways and can even
   * populate the caller with rows from a nonrelational data source.
   * In general, a reader may invoke any of the rowset's methods,
   * with one exception. Calling the method <code>execute</code> will
   * cause an <code>SQLException</code> to be thrown
   * because <code>execute</code> may not be called recursively.  Also,
   * when a reader invokes <code>RowSet</code> methods, no listeners
   * are notified; that is, no <code>RowSetEvent</code> objects are
   * generated and no <code>RowSetListener</code> methods are invoked.
   * This is true because listeners are already being notified by the method
   * <code>execute</code>.
   *
   * @param caller the <code>RowSet</code> object (1) that has implemented the
   *         <code>RowSetInternal</code> interface, (2) with which this reader is
   *        registered, and (3) whose <code>execute</code> method called this reader
   * @exception SQLException if a database access error occurs or this method
   *            invokes the <code>RowSet.execute</code> method
   */
  void readData(RowSetInternal caller) throws SQLException;

}