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authorAaron M. Renn <arenn@urbanophile.com>1999-01-19 02:17:26 +0000
committerAaron M. Renn <arenn@urbanophile.com>1999-01-19 02:17:26 +0000
commit03c85396b198e22f18cd1881f5d86b7d7b5fa14f (patch)
treecb04dc3b04c311b24fdbc4a2ba2417f402f84ac0 /java/sql/Statement.java
parentea6916243746fc632554f29840d55538f1171153 (diff)
downloadclasspath-03c85396b198e22f18cd1881f5d86b7d7b5fa14f.tar.gz
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+/*************************************************************************
+/* Statement.java -- Interface for executing SQL statements.
+/*
+/* Copyright (c) 1999 Free Software Foundation, Inc.
+/* Written by Aaron M. Renn (arenn@urbanophile.com)
+/*
+/* This library is free software; you can redistribute it and/or modify
+/* it under the terms of the GNU Library General Public License as published
+/* by the Free Software Foundation, either version 2 of the License, or
+/* (at your option) any later verion.
+/*
+/* This library 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 Library General Public License for more details.
+/*
+/* You should have received a copy of the GNU Library General Public License
+/* along with this library; if not, write to the Free Software Foundation
+/* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA
+/*************************************************************************/
+
+package java.sql;
+
+/**
+ * This interface provides a mechanism for executing SQL statements.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public abstract interface Statement
+{
+
+/**
+ * This method executes the specified SQL SELECT statement and returns a
+ * (possibly empty) <code>ResultSet</code> with the results of the query.
+ *
+ * @param sql The SQL statement to execute.
+ *
+ * @return The result set of the SQL statement.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract ResultSet
+executeQuery(String sql) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method executes the specified SQL INSERT, UPDATE, or DELETE statement
+ * and returns the number of rows affected, which may be 0.
+ *
+ * @param sql The SQL statement to execute.
+ *
+ * @return The number of rows affected by the SQL statement.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+executeUpdate(String sql) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method closes the statement and frees any associated resources.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+close() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the maximum length of any column value in bytes.
+ *
+ * @return The maximum length of any column value in bytes.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+getMaxFieldSize() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method sets the limit for the maximum length of any column in bytes.
+ *
+ * @param maxsize The new maximum length of any column in bytes.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setMaxFieldSize(int maxsize) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the maximum possible number of rows in a result set.
+ *
+ * @return The maximum possible number of rows in a result set.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+getMaxRows() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method sets the maximum number of rows that can be present in a
+ * result set.
+ *
+ * @param maxrows The maximum possible number of rows in a result set.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setMaxRows(int maxrows) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method sets the local escape processing mode on or off. The
+ * default value is on.
+ *
+ * @param escape <code>true</code> to enable local escape processing,
+ * <code>false</code> to disable it.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setEscapeProcessing(boolean esacpe) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * The method returns the number of seconds a statement may be in process
+ * before timing out. A value of 0 means there is no timeout.
+ *
+ * @return The SQL statement timeout in seconds.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+getQueryTimeout() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method sets the number of seconds a statement may be in process
+ * before timing out. A value of 0 means there is no timeout.
+ *
+ * @param timeout The new SQL statement timeout value.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setQueryTimeout(int timeout) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method cancels an outstanding statement, if the database supports
+ * that operation.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+cancel() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the first SQL warning attached to this statement.
+ * Subsequent warnings will be chained to this one.
+ *
+ * @return The first SQL warning for this statement.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract SQLWarning
+getWarnings() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method clears any SQL warnings that have been attached to this
+ * statement.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+clearWarnings() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method sets the cursor name that will be used by the result set.
+ *
+ * @param name The cursor name to use for this statement.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setCursorName(String name) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method executes an arbitrary SQL statement of any time. The
+ * methods <code>getResultSet</code>, <code>getMoreResults</code> and
+ * <code>getUpdateCount</code> retrieve the results.
+ *
+ * @return <code>true</code> if a result set was returned, <code>false</code>
+ * if an update count was returned.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract boolean
+execute(String sql) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the result set of the SQL statement that was
+ * executed. This should be called only once per result set returned.
+ *
+ * @return The result set of the query, or <code>null</code> if there was
+ * no result set (for example, if the statement was an UPDATE).
+ *
+ * @exception SQLException If an error occurs.
+ *
+ * @see execute
+ */
+public abstract ResultSet
+getResultSet() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the update count of the SQL statement that was
+ * executed. This should be called only once per executed SQL statement.
+ *
+ * @return The update count of the query, or -1 if there was no update
+ * count (for example, if the statement was a SELECT).
+ *
+ * @exception SQLException If an error occurs.
+ *
+ * @see execute
+ */
+public abstract int
+getUpdateCount() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method advances the result set pointer to the next result set,
+ * which can then be retrieved using <code>getResultSet</code>
+ *
+ * @return <code>true</code> if there is another result set,
+ * <code>false</code> otherwise (for example, the next result is an
+ * update count).
+ *
+ * @exception SQLException If an error occurs.
+ *
+ * @see execute
+ */
+public abstract boolean
+getMoreResults() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the current direction that the driver thinks the
+ * result set will be accessed int.
+ *
+ * @return The direction the result set will be accessed in (????)
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+getFetchDirection() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method informs the driver which direction the result set will
+ * be accessed in.
+ *
+ * @param direction The direction the result set will be accessed in (?????)
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setFetchDirection(int direction) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the number of rows the driver believes should be
+ * fetched from the database at a time.
+ *
+ * @return The number of rows that will be fetched from the database at a time.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int
+getFetchSize() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method informs the driver how many rows it should fetch from the
+ * database at a time.
+ *
+ * @param numrows The number of rows the driver should fetch at a time
+ * to populate the result set.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+setFetchSize(int numrows) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the concurrency type of the result set for this
+ * statement. This will be one of the concurrency types defined in
+ * <code>ResultSet</code>.
+ *
+ * @return The concurrency type of the result set for this statement.
+ *
+ * @exception SQLException If an error occurs.
+ *
+ * @see ResultSet
+ */
+public abstract int
+getResultSetConcurrency() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the result set type for this statement. This will
+ * be one of the result set types defined in <code>ResultSet</code>.
+ *
+ * @return The result set type for this statement.
+ *
+ * @exception SQLException If an error occurs.
+ *
+ * @see ResultSet
+ */
+public abstract int
+getResultSetType() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method adds a SQL statement to a SQL batch. A driver is not
+ * required to implement this method.
+ *
+ * @param sql The sql statement to add to the batch.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+addBatch(String sql) throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method clears out any SQL statements that have been populated in
+ * the current batch. A driver is not required to implement this method.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract void
+clearBatch() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method executes the SQL batch and returns an array of update
+ * counts - one for each SQL statement in the batch - ordered in the same
+ * order the statements were added to the batch. A driver is not required
+ * to implement this method.
+ *
+ * @return An array of update counts for this batch.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract int[]
+executeBatch() throws SQLException;
+
+/*************************************************************************/
+
+/**
+ * This method returns the <code>Connection</code> instance that was
+ * used to create this object.
+ *
+ * @return The connection used to create this object.
+ *
+ * @exception SQLException If an error occurs.
+ */
+public abstract Connection
+getConnection() throws SQLException;
+
+} // interface Statement
+