425 lines
13 KiB
Java
425 lines
13 KiB
Java
/* Statement.java -- Interface for executing SQL statements.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.sql;
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/**
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* This interface provides a mechanism for executing SQL statements.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public interface Statement
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{
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/**
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* This method executes the specified SQL SELECT statement and returns a
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* (possibly empty) <code>ResultSet</code> with the results of the query.
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*
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* @param sql The SQL statement to execute.
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*
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* @return The result set of the SQL statement.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract ResultSet
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executeQuery(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method executes the specified SQL INSERT, UPDATE, or DELETE statement
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* and returns the number of rows affected, which may be 0.
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*
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* @param sql The SQL statement to execute.
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*
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* @return The number of rows affected by the SQL statement.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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executeUpdate(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method closes the statement and frees any associated resources.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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close() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the maximum length of any column value in bytes.
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*
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* @return The maximum length of any column value in bytes.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getMaxFieldSize() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the limit for the maximum length of any column in bytes.
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*
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* @param maxsize The new maximum length of any column in bytes.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setMaxFieldSize(int maxsize) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the maximum possible number of rows in a result set.
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*
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* @return The maximum possible number of rows in a result set.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getMaxRows() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the maximum number of rows that can be present in a
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* result set.
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*
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* @param maxrows The maximum possible number of rows in a result set.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setMaxRows(int maxrows) throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the local escape processing mode on or off. The
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* default value is on.
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*
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* @param escape <code>true</code> to enable local escape processing,
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* <code>false</code> to disable it.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setEscapeProcessing(boolean esacpe) throws SQLException;
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/*************************************************************************/
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/**
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* The method returns the number of seconds a statement may be in process
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* before timing out. A value of 0 means there is no timeout.
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*
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* @return The SQL statement timeout in seconds.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getQueryTimeout() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the number of seconds a statement may be in process
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* before timing out. A value of 0 means there is no timeout.
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*
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* @param timeout The new SQL statement timeout value.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setQueryTimeout(int timeout) throws SQLException;
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/*************************************************************************/
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/**
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* This method cancels an outstanding statement, if the database supports
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* that operation.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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cancel() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the first SQL warning attached to this statement.
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* Subsequent warnings will be chained to this one.
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*
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* @return The first SQL warning for this statement.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract SQLWarning
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getWarnings() throws SQLException;
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/*************************************************************************/
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/**
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* This method clears any SQL warnings that have been attached to this
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* statement.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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clearWarnings() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the cursor name that will be used by the result set.
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*
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* @param name The cursor name to use for this statement.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setCursorName(String name) throws SQLException;
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/*************************************************************************/
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/**
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* This method executes an arbitrary SQL statement of any time. The
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* methods <code>getResultSet</code>, <code>getMoreResults</code> and
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* <code>getUpdateCount</code> retrieve the results.
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*
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* @return <code>true</code> if a result set was returned, <code>false</code>
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* if an update count was returned.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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execute(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the result set of the SQL statement that was
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* executed. This should be called only once per result set returned.
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*
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* @return The result set of the query, or <code>null</code> if there was
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* no result set (for example, if the statement was an UPDATE).
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*
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* @exception SQLException If an error occurs.
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*
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* @see execute
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*/
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public abstract ResultSet
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getResultSet() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the update count of the SQL statement that was
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* executed. This should be called only once per executed SQL statement.
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*
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* @return The update count of the query, or -1 if there was no update
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* count (for example, if the statement was a SELECT).
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*
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* @exception SQLException If an error occurs.
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*
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* @see execute
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*/
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public abstract int
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getUpdateCount() throws SQLException;
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/*************************************************************************/
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/**
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* This method advances the result set pointer to the next result set,
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* which can then be retrieved using <code>getResultSet</code>
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*
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* @return <code>true</code> if there is another result set,
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* <code>false</code> otherwise (for example, the next result is an
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* update count).
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*
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* @exception SQLException If an error occurs.
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*
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* @see execute
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*/
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public abstract boolean
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getMoreResults() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the current direction that the driver thinks the
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* result set will be accessed int.
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*
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* @return The direction the result set will be accessed in (????)
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getFetchDirection() throws SQLException;
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/*************************************************************************/
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/**
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* This method informs the driver which direction the result set will
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* be accessed in.
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*
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* @param direction The direction the result set will be accessed in (?????)
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setFetchDirection(int direction) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the number of rows the driver believes should be
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* fetched from the database at a time.
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*
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* @return The number of rows that will be fetched from the database at a time.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getFetchSize() throws SQLException;
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/*************************************************************************/
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/**
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* This method informs the driver how many rows it should fetch from the
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* database at a time.
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*
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* @param numrows The number of rows the driver should fetch at a time
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* to populate the result set.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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setFetchSize(int numrows) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the concurrency type of the result set for this
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* statement. This will be one of the concurrency types defined in
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* <code>ResultSet</code>.
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*
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* @return The concurrency type of the result set for this statement.
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*
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* @exception SQLException If an error occurs.
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*
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* @see ResultSet
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*/
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public abstract int
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getResultSetConcurrency() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the result set type for this statement. This will
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* be one of the result set types defined in <code>ResultSet</code>.
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*
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* @return The result set type for this statement.
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*
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* @exception SQLException If an error occurs.
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*
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* @see ResultSet
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*/
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public abstract int
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getResultSetType() throws SQLException;
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/*************************************************************************/
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/**
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* This method adds a SQL statement to a SQL batch. A driver is not
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* required to implement this method.
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*
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* @param sql The sql statement to add to the batch.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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addBatch(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method clears out any SQL statements that have been populated in
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* the current batch. A driver is not required to implement this method.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract void
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clearBatch() throws SQLException;
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/*************************************************************************/
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/**
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* This method executes the SQL batch and returns an array of update
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* counts - one for each SQL statement in the batch - ordered in the same
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* order the statements were added to the batch. A driver is not required
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* to implement this method.
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*
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* @return An array of update counts for this batch.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int[]
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executeBatch() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the <code>Connection</code> instance that was
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* used to create this object.
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*
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* @return The connection used to create this object.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract Connection
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getConnection() throws SQLException;
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} // interface Statement
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