463 lines
15 KiB
Java
463 lines
15 KiB
Java
/* Connection.java -- Manage a database connection.
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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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import java.util.Map;
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/**
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* This interface provides methods for managing a connection to a database.
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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 Connection
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{
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/**
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* This transaction isolation level indicates that transactions are not
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* supported.
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*/
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public static final int TRANSACTION_NONE = 0;
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/**
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* This transaction isolation level indicates that one transaction can
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* read modifications by other transactions before the other transactions
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* have committed their changes. This could result in invalid reads.
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*/
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public static final int TRANSACTION_READ_UNCOMMITTED = 1;
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/**
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* This transaction isolation leve indicates that only committed data from
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* other transactions will be read. If a transaction reads a row, then
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* another transaction commits a change to that row, the first transaction
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* would retrieve the changed row on subsequent reads of the same row.
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*/
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public static final int TRANSACTION_READ_COMMITTED = 2;
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/**
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* This transaction isolation level indicates that only committed data from
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* other transactions will be read. It also ensures that data read from
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* a row will not be different on a subsequent read even if another
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* transaction commits a change.
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*/
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public static final int TRANSACTION_REPEATABLE_READ = 4;
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/**
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* This transaction isolation level indicates that only committed data from
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* other transactions will be read. It also ensures that data read from
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* a row will not be different on a subsequent read even if another
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* transaction commits a change. Additionally, rows modified by other
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* transactions will not affect the result set returned during subsequent
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* executions of the same WHERE clause in this transaction.
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*/
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public static final int TRANSACTION_SERIALIZABLE = 8;
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/*************************************************************************/
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/**
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* This method creates a new SQL statement. The default result set type
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* and concurrency will be used.
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*
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* @return A new <code>Statement</code> object.
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*
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* @exception SQLException If an error occurs.
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*
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* @see Statement
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*/
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public abstract Statement
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createStatement() throws SQLException;
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/*************************************************************************/
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/**
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* This method creates a new SQL statement with the specified type and
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* concurrency. Valid values for these parameters are specified in the
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* <code>ResultSet</code> class.
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*
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* @param resultSetType The type of result set to use for this statement.
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* @param resultSetConcurrency. The type of concurrency to be used in
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* the result set for this statement.
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*
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* @return A new <code>Statement</code> object.
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*
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* @exception SQLException If an error occurs.
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*
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* @see Statement
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* @see ResultSet
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*/
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public abstract Statement
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createStatement(int resultSetType, int resultSetConcurrency)
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throws SQLException;
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/*************************************************************************/
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/**
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* This method creates a new <code>PreparedStatement</code> for the specified
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* SQL string. This method is designed for use with parameterized
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* statements. The default result set type and concurrency will be used.
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*
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* @param The SQL statement to use in creating this
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* <code>PreparedStatement</code>.
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*
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* @return A new <code>PreparedStatement</code>.
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*
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* @exception SQLException If an error occurs.
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*
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* @see PreparedStatement
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*/
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public abstract PreparedStatement
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prepareStatement(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method creates a new <code>PreparedStatement</code> for the specified
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* SQL string. This method is designed for use with parameterized
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* statements. The specified result set type and concurrency will be used.
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* Valid values for these parameters are specified in the
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* <code>ResultSet</code> class.
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*
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* @param The SQL statement to use in creating this
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* <code>PreparedStatement</code>.
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* @param resultSetType The type of result set to use for this statement.
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* @param resultSetConcurrency. The type of concurrency to be used in
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* the result set for this statement.
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*
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* @return A new <code>PreparedStatement</code>.
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*
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* @exception SQLException If an error occurs.
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*
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* @see PreparedStatement
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* @see ResultSet
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*/
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public abstract PreparedStatement
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prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
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throws SQLException;
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/*************************************************************************/
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/**
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* This method creates a new <code>CallableStatement</code> for the
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* specified SQL string. Thie method is designed to be used with
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* stored procedures. The default result set type and concurrency
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* will be used.
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*
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* @param The SQL statement to use in creating this
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* <code>CallableStatement</code>.
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*
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* @return A new <code>CallableStatement</code>.
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*
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* @exception SQLException If an error occurs.
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*
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* @see CallableStatement
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*/
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public abstract CallableStatement
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prepareCall(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method creates a new <code>CallableStatement</code> for the
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* specified SQL string. Thie method is designed to be used with
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* stored procedures. The specified result set type and concurrency
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* will be used. Valid values for these parameters are specified in the
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* <code>ResultSet</code> class.
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*
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* @param The SQL statement to use in creating this
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* <code>PreparedStatement</code>.
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* @param resultSetType The type of result set to use for this statement.
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* @param resultSetConcurrency. The type of concurrency to be used in
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* the result set for this statement.
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*
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* @return A new <code>CallableStatement</code>.
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*
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* @exception SQLException If an error occurs.
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*
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* @see CallableStatement
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* @see ResultSet
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*/
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public abstract CallableStatement
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prepareCall(String sql, int resultSetType, int resultSetConcurrency)
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throws SQLException;
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/*************************************************************************/
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/**
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* This method converts the specified generic SQL statement into the
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* native grammer of the database this object is connected to.
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*
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* @param The JDBC generic SQL statement.
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*
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* @return The native 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 String
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nativeSQL(String sql) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not auto commit mode is currently enabled.
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* In auto commit mode, every SQL statement is committed its own transaction.
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* Otherwise a transaction must be explicitly committed or rolled back.
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*
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* @return <code>true</code> if auto commit mode is enabled,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*
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* @see commit
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* @see rollback
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*/
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public abstract boolean
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getAutoCommit() throws SQLException;
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/*************************************************************************/
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/**
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* This method turns auto commit mode on or off. In auto commit mode,
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* every SQL statement is committed its own transaction. Otherwise a
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* transaction must be explicitly committed or rolled back.
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*
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* @param autoCommit <code>true</code> to enable auto commit mode,
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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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* @see commit
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* @see rollback
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*/
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public abstract void
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setAutoCommit(boolean autoCommit) throws SQLException;
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/*************************************************************************/
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/**
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* This method commits any SQL statements executed on this connection since
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* the last commit or rollback.
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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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commit() throws SQLException;
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/*************************************************************************/
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/**
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* This method rolls back any SQL statements executed on this connection
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* since the last commit or rollback.
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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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rollback() throws SQLException;
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/*************************************************************************/
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/**
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* This method immediately closes this database connection.
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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 tests whether or not this connection has been closed.
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*
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* @return <code>true</code> if the connection is closed, <code>false</code>
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* otherwise.
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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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isClosed() throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the meta data for this database connection.
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*
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* @return The meta data for this database.
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*
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* @exception SQLException If an error occurs.
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*
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* @see DatabaseMetaData
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*/
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public abstract DatabaseMetaData
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getMetaData() throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not this connection is in read only mode.
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*
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* @return <code>true</code> if the connection is read only <code>false</code>
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* otherwise.
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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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isReadOnly() throws SQLException;
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/*************************************************************************/
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/**
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* This method turns read only mode on or off. It may not be called while
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* a transaction is in progress.
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*
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* @param readOnly <code>true</code> if this connection is read only,
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* <code>false</code> otherwise.
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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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setReadOnly(boolean readOnly) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the catalog in use by this connection,
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* if any.
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*
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* @return The name of the catalog, or <code>null</code> if one does not
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* exist or catalogs are not supported by this database.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getCatalog() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the name of the catalog in use by this connection.
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* Note that this method does nothing if catalogs are not supported by
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* this database.
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*
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* @param catalog The name of the catalog to use for this connection.
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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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setCatalog(String catalog) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the current transaction isolation mode. This will
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* be one of the constants defined in this interface.
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*
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* @return The transaction isolation level.
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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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getTransactionIsolation() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the current transaction isolation mode. This must
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* be one of the constants defined in this interface.
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*
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* @param level The transaction isolation level.
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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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setTransactionIsolation(int level) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the first warning that occurred on this connection,
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* if any. If there were any subsequence warnings, they will be chained
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* to the first one.
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*
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* @return The first <code>SQLWarning</code> that occurred, or
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* <code>null</code> if there have been no warnings.
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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 all warnings that have occurred on this connection.
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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 returns the mapping of SQL types to Java classes
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* currently in use by this connection. This mapping will have no
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* entries unless they have been manually added.
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*
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* @return The SQL type to Java class mapping.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract Map
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getTypeMap() throws SQLException;
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/*************************************************************************/
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/**
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* This method sets the mapping table for SQL types to Java classes.
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* Any entries in this map override the defaults.
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*
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* @param map The new SQL mapping table.
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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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setTypeMap(Map map) throws SQLException;
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} // interface Connection
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