RowData.java
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上传日期:2022-07-20
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文件大小:6k
源码类别:
数据库编程
开发平台:
Java
- /*
- Copyright (C) 2002 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- package com.mysql.jdbc;
- import java.sql.SQLException;
- /**
- * This interface abstracts away how row data is accessed by
- * the result set. It is meant to allow a static implementation
- * (Current version), and a streaming one.
- *
- * @author dgan
- */
- public interface RowData {
- /**
- * What's returned for the size of a result set
- * when its size can not be determined.
- */
- public static final int RESULT_SET_SIZE_UNKNOWN = -1;
- /**
- * Returns true if we got the last element.
- *
- * @return true if after last row
- * @throws SQLException if a database error occurs
- */
- boolean isAfterLast() throws SQLException;
- /**
- * Only works on non dynamic result sets.
- *
- * @param index row number to get at
- * @return row data at index
- * @throws SQLException if a database error occurs
- */
- byte[][] getAt(int index) throws SQLException;
- /**
- * Returns if iteration has not occured yet.
- *
- * @return true if before first row
- * @throws SQLException if a database error occurs
- */
- boolean isBeforeFirst() throws SQLException;
- /**
- * Moves the current position in the result set to
- * the given row number.
- *
- * @param rowNumber row to move to
- * @throws SQLException if a database error occurs
- */
- void setCurrentRow(int rowNumber) throws SQLException;
- /**
- * Returns the current position in the result set as
- * a row number.
- *
- * @return the current row number
- * @throws SQLException if a database error occurs
- */
- int getCurrentRowNumber() throws SQLException;
- /**
- * Returns true if the result set is dynamic.
- *
- * This means that move back and move forward won't work
- * because we do not hold on to the records.
- *
- * @return true if this result set is streaming from the server
- * @throws SQLException if a database error occurs
- */
- boolean isDynamic() throws SQLException;
- /**
- * Has no records.
- *
- * @return true if no records
- * @throws SQLException if a database error occurs
- */
- boolean isEmpty() throws SQLException;
- /**
- * Are we on the first row of the result set?
- *
- * @return true if on first row
- * @throws SQLException if a database error occurs
- */
- boolean isFirst() throws SQLException;
- /**
- * Are we on the last row of the result set?
- *
- * @return true if on last row
- * @throws SQLException if a database error occurs
- */
- boolean isLast() throws SQLException;
- /**
- * Adds a row to this row data.
- *
- * @param row the row to add
- * @throws SQLException if a database error occurs
- */
- void addRow(byte[][] row) throws SQLException;
- /**
- * Moves to after last.
- *
- * @throws SQLException if a database error occurs
- */
- void afterLast() throws SQLException;
- /**
- * Moves to before first.
- *
- * @throws SQLException if a database error occurs
- */
- void beforeFirst() throws SQLException;
- /**
- * Moves to before last so next el is the last el.
- *
- * @throws SQLException if a database error occurs
- */
- void beforeLast() throws SQLException;
- /**
- * We're done.
- *
- * @throws SQLException if a database error occurs
- */
- void close() throws SQLException;
- /**
- * Returns true if another row exsists.
- *
- * @return true if more rows
- * @throws SQLException if a database error occurs
- */
- boolean hasNext() throws SQLException;
- /**
- * Moves the current position relative 'rows' from
- * the current position.
- *
- * @param rows the relative number of rows to move
- * @throws SQLException if a database error occurs
- */
- void moveRowRelative(int rows) throws SQLException;
- /**
- * Returns the next row.
- *
- * @return the next row value
- * @throws SQLException if a database error occurs
- */
- byte[][] next() throws SQLException;
- /**
- * Removes the row at the given index.
- *
- * @param index the row to move to
- * @throws SQLException if a database error occurs
- */
- void removeRow(int index) throws SQLException;
- /**
- * Only works on non dynamic result sets.
- *
- * @return the size of this row data
- * @throws SQLException if a database error occurs
- */
- int size() throws SQLException;
- /**
- * Set the result set that 'owns' this RowData
- *
- * @param rs the result set that 'owns' this RowData
- */
- void setOwner(ResultSet rs);
- /**
- * Returns the result set that 'owns' this RowData
- *
- * @return the result set that 'owns' this RowData
- */
- ResultSet getOwner();
- }