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/* Connection.java -- Manage a database connection.

   Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.sql;

import java.util.Map;

/**

 * This interface provides methods for managing a connection to a database.

 *

 * @author Aaron M. Renn (arenn@urbanophile.com)

 */

public interface Connection

{

  /**

   * This transaction isolation level indicates that transactions are not

   * supported.

   */

  int TRANSACTION_NONE = 0;

  /**

   * This transaction isolation level indicates that one transaction can

   * read modifications by other transactions before the other transactions

   * have committed their changes.  This could result in invalid reads.

   */

  int TRANSACTION_READ_UNCOMMITTED = 1;

  /**

   * This transaction isolation leve indicates that only committed data from

   * other transactions will be read.  If a transaction reads a row, then

   * another transaction commits a change to that row, the first transaction

   * would retrieve the changed row on subsequent reads of the same row.

   */

  int TRANSACTION_READ_COMMITTED = 2;

  /**

   * This transaction isolation level indicates that only committed data from

   * other transactions will be read.  It also ensures that data read from

   * a row will not be different on a subsequent read even if another

   * transaction commits a change.

   */

  int TRANSACTION_REPEATABLE_READ = 4;

  /**

   * This transaction isolation level indicates that only committed data from

   * other transactions will be read.  It also ensures that data read from

   * a row will not be different on a subsequent read even if another

   * transaction commits a change.  Additionally, rows modified by other

   * transactions will not affect the result set returned during subsequent

   * executions of the same WHERE clause in this transaction.

   */

  int TRANSACTION_SERIALIZABLE = 8;

  /**

   * This method creates a new SQL statement.  The default result set type

   * and concurrency will be used.

   *

   * @return A new <code>Statement</code> object.

   * @exception SQLException If an error occurs.

   * @see Statement

   */

  Statement createStatement() throws SQLException;

  /**

   * This method creates a new <code>PreparedStatement</code> for the specified

   * SQL string.  This method is designed for use with parameterized

   * statements.  The default result set type and concurrency will be used.

   *

   * @param The SQL statement to use in creating this

   *        <code>PreparedStatement</code>.

   * @return A new <code>PreparedStatement</code>.

   * @exception SQLException If an error occurs.

   * @see PreparedStatement

   */

  PreparedStatement prepareStatement(String sql) throws SQLException;

  /**

   * This method creates a new <code>CallableStatement</code> for the

   * specified SQL string.  Thie method is designed to be used with

   * stored procedures.  The default result set type and concurrency

   * will be used.

   *

   * @param The SQL statement to use in creating this

   *        <code>CallableStatement</code>.

   * @return A new <code>CallableStatement</code>.

   * @exception SQLException If an error occurs.

   * @see CallableStatement

   */

  CallableStatement prepareCall(String sql) throws SQLException;

  /**

   * This method converts the specified generic SQL statement into the

   * native grammer of the database this object is connected to.

   *

   * @param The JDBC generic SQL statement.

   * @return The native SQL statement.

   * @exception SQLException If an error occurs.

   */

  String nativeSQL(String sql) throws SQLException;

  /**

   * This method turns auto commit mode on or off.  In auto commit mode,

   * every SQL statement is committed its own transaction.  Otherwise a

   * transaction must be explicitly committed or rolled back.

   *

   * @param autoCommit <code>true</code> to enable auto commit mode,

   *        <code>false</code> to disable it.

   * @exception SQLException If an error occurs.

   * @see commit

   * @see rollback

   */

  void setAutoCommit(boolean autoCommit) throws SQLException;

  /**

   * This method tests whether or not auto commit mode is currently enabled.

   * In auto commit mode,  every SQL statement is committed its own transaction.

   * Otherwise a transaction must be explicitly committed or rolled back.

   *

   * @return <code>true</code> if auto commit mode is enabled,

   * <code>false</code> otherwise.

   *

   * @exception SQLException If an error occurs.

   *

   * @see commit

   * @see rollback

   */

  boolean getAutoCommit() throws SQLException;

 /**

  * This method commits any SQL statements executed on this connection since

  * the last commit or rollback.

  *

  * @exception SQLException If an error occurs.

  */

  void commit() throws SQLException;

  /**

   * This method rolls back any SQL statements executed on this connection

   * since the last commit or rollback.

   *

   * @exception SQLException If an error occurs.

   */

  void rollback() throws SQLException;

  /**

   * This method immediately closes this database connection.

   *

   * @exception SQLException If an error occurs.

   */

  void close() throws SQLException;

  /**

   * This method tests whether or not this connection has been closed.

   *

   * @return <code>true</code> if the connection is closed, <code>false</code>

   *         otherwise.

   * @exception SQLException If an error occurs.

   */

  boolean isClosed() throws SQLException;

  /**

   * This method returns the meta data for this database connection.

   *

   * @return The meta data for this database.

   * @exception SQLException If an error occurs.

   * @see DatabaseMetaData

   */

  DatabaseMetaData getMetaData() throws SQLException;

  /**

   * This method turns read only mode on or off.  It may not be called while

   * a transaction is in progress.

   *

   * @param readOnly <code>true</code> if this connection is read only,

   *        <code>false</code> otherwise.

   * @exception SQLException If an error occurs.

   */

  void setReadOnly(boolean readOnly) throws SQLException;

  /**

   * This method tests whether or not this connection is in read only mode.

   *

   * @return <code>true</code> if the connection is read only <code>false</code>

   *         otherwise.

   * @exception SQLException If an error occurs.

   */

  boolean isReadOnly() throws SQLException;

  /**

   * This method sets the name of the catalog in use by this connection.

   * Note that this method does nothing if catalogs are not supported by

   * this database.

   *

   * @param catalog The name of the catalog to use for this connection.

   * @exception SQLException If an error occurs.

   */

  void setCatalog(String catalog) throws SQLException;

  /**

   * This method returns the name of the catalog in use by this connection,

   * if any.

   *

   * @return The name of the catalog, or <code>null</code> if one does not

   *         exist or catalogs are not supported by this database.

   * @exception SQLException If an error occurs.

   */

  String getCatalog() throws SQLException;

  /**

   * This method sets the current transaction isolation mode.  This must

   * be one of the constants defined in this interface.

   *

   * @param level The transaction isolation level.

   * @exception SQLException If an error occurs.

   */

  void setTransactionIsolation(int level) throws SQLException;

  /**

   * This method returns the current transaction isolation mode.  This will

   * be one of the constants defined in this interface.

   *

   * @return The transaction isolation level.

   * @exception SQLException If an error occurs.

   */

  int getTransactionIsolation() throws SQLException;

  /**

   * This method returns the first warning that occurred on this connection,

   * if any.  If there were any subsequence warnings, they will be chained

   * to the first one.

   *

   * @return The first <code>SQLWarning</code> that occurred, or

   *         <code>null</code> if there have been no warnings.

   * @exception SQLException If an error occurs.

   */

  SQLWarning getWarnings() throws SQLException;

  /**

   * This method clears all warnings that have occurred on this connection.

   *

   * @exception SQLException If an error occurs.

   */

  void clearWarnings() throws SQLException;

  /**

   * This method creates a new SQL statement with the specified type and

   * concurrency.  Valid values for these parameters are specified in the

   * <code>ResultSet</code> class.

   *

   * @param resultSetType The type of result set to use for this statement.

   * @param resultSetConcurrency.  The type of concurrency to be used in

   *        the result set for this statement.

   * @return A new <code>Statement</code> object.

   * @exception SQLException If an error occurs.

   * @see Statement

   * @see ResultSet

   */

  Statement createStatement(int resultSetType, int resultSetConcurrency)

    throws SQLException;

  /**

   * This method creates a new <code>PreparedStatement</code> for the specified

   * SQL string.  This method is designed for use with parameterized

   * statements.  The specified result set type and concurrency will be used.

   * Valid values for these parameters are specified in the

   * <code>ResultSet</code> class.

   *

   * @param The SQL statement to use in creating this

   *        <code>PreparedStatement</code>.

   * @param resultSetType The type of result set to use for this statement.

   * @param resultSetConcurrency.  The type of concurrency to be used in

   *        the result set for this statement.

   * @return A new <code>PreparedStatement</code>.

   * @exception SQLException If an error occurs.

   * @see PreparedStatement

   * @see ResultSet

   */

  PreparedStatement prepareStatement(String sql, int resultSetType,

    int resultSetConcurrency) throws SQLException;

  /**

   * This method creates a new <code>CallableStatement</code> for the

   * specified SQL string.  Thie method is designed to be used with

   * stored procedures.  The specified result set type and concurrency

   * will be used.  Valid values for these parameters are specified in the

   * <code>ResultSet</code> class.

   *

   * @param The SQL statement to use in creating this

   *        <code>PreparedStatement</code>.

   * @param resultSetType The type of result set to use for this statement.

   * @param resultSetConcurrency.  The type of concurrency to be used in

   *        the result set for this statement.

   * @return A new <code>CallableStatement</code>.

   * @exception SQLException If an error occurs.

   * @see CallableStatement

   * @see ResultSet

   */

  CallableStatement prepareCall(String sql, int resultSetType, int

    resultSetConcurrency) throws SQLException;

  /**

   * This method returns the mapping of SQL types to Java classes

   * currently in use by this connection.  This mapping will have no

   * entries unless they have been manually added.

   *

   * @return The SQL type to Java class mapping.

   * @exception SQLException If an error occurs.

   */

  Map getTypeMap() throws SQLException;

  /**

   * This method sets the mapping table for SQL types to Java classes.

   * Any entries in this map override the defaults.

   *

   * @param map The new SQL mapping table.

   * @exception SQLException If an error occurs.

   */

  void setTypeMap(Map map) throws SQLException;

  /**

   * @since 1.4

   */

  void setHoldability(int holdability) throws SQLException;

  /**

   * @since 1.4

   */

  int getHoldability() throws SQLException;

  /**

   * @since 1.4

   */

  Savepoint setSavepoint() throws SQLException;

  /**

   * @since 1.4

   */

  Savepoint setSavepoint(String name) throws SQLException;

  /**

   * @since 1.4

   */

  void rollback(Savepoint savepoint) throws SQLException;

  /**

   * @since 1.4

   */

  void releaseSavepoint(Savepoint savepoint) throws SQLException;

  /**

   * @since 1.4

   */

  Statement createStatement(int resultSetType, int

      resultSetConcurrency, int resultSetHoldability) throws SQLException;

  /**

   * @since 1.4

   */

  PreparedStatement prepareStatement(String sql, int resultSetType, int

      resultSetConcurrency, int resultSetHoldability) throws SQLException;

  /**

   * @since 1.4

   */

  CallableStatement prepareCall(String sql, int resultSetType, int

      resultSetConcurrency, int resultSetHoldability) throws SQLException;

  /**

   * @since 1.4

   */

  PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)

      throws SQLException;

  /**

   * @since 1.4

   */

  PreparedStatement prepareStatement(String sql, int[] columnIndexes)

      throws SQLException;

  /**

   * @since 1.4

   */

  PreparedStatement prepareStatement(String sql, String[] columnNames)

      throws SQLException;

}