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74 lines
2.4 KiB
74 lines
2.4 KiB
/*
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* Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.sql;
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import java.sql.*;
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/**
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* The facility that a disconnected <code>RowSet</code> object calls on
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* to populate itself with rows of data. A reader (an object implementing the
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* <code>RowSetReader</code> interface) may be registered with
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* a <code>RowSet</code> object that supports the reader/writer paradigm.
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* When the <code>RowSet</code> object's <code>execute</code> method is
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* called, it in turn calls the reader's <code>readData</code> method.
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*
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* @since 1.4
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*/
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public interface RowSetReader {
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/**
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* Reads the new contents of the calling <code>RowSet</code> object.
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* In order to call this method, a <code>RowSet</code>
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* object must have implemented the <code>RowSetInternal</code> interface
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* and registered this <code>RowSetReader</code> object as its reader.
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* The <code>readData</code> method is invoked internally
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* by the <code>RowSet.execute</code> method for rowsets that support the
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* reader/writer paradigm.
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*
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* <P>The <code>readData</code> method adds rows to the caller.
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* It can be implemented in a wide variety of ways and can even
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* populate the caller with rows from a nonrelational data source.
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* In general, a reader may invoke any of the rowset's methods,
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* with one exception. Calling the method <code>execute</code> will
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* cause an <code>SQLException</code> to be thrown
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* because <code>execute</code> may not be called recursively. Also,
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* when a reader invokes <code>RowSet</code> methods, no listeners
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* are notified; that is, no <code>RowSetEvent</code> objects are
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* generated and no <code>RowSetListener</code> methods are invoked.
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* This is true because listeners are already being notified by the method
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* <code>execute</code>.
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*
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* @param caller the <code>RowSet</code> object (1) that has implemented the
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* <code>RowSetInternal</code> interface, (2) with which this reader is
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* registered, and (3) whose <code>execute</code> method called this reader
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* @exception SQLException if a database access error occurs or this method
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* invokes the <code>RowSet.execute</code> method
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*/
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void readData(RowSetInternal caller) throws SQLException;
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}
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