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RowSetReader.java
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73 lines (67 loc) · 2.38 KB
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/*
* Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.sql;
import java.sql.*;
/**
* 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 <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;
}