gecko/storage/public/mozIStorageConnection.idl

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/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Oracle Corporation code.
*
* The Initial Developer of the Original Code is
* Oracle Corporation
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
* Brett Wilson <brettw@gmail.com>
* Shawn Wilsher <me@shawnwilsher.com>
* Lev Serebryakov <lev@serebryakov.spb.ru>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
interface mozIStorageAggregateFunction;
interface mozIStorageFunction;
interface mozIStorageProgressHandler;
interface mozIStorageStatement;
interface nsIFile;
/**
* mozIStorageConnection represents a database connection attached to
* a specific file or to the in-memory data storage. It is the
* primary interface for interacting with a database, including
* creating prepared statements, executing SQL, and examining database
* errors.
*/
[scriptable, uuid(ffddc17b-cec3-492c-b13e-d5393c4b1595)]
interface mozIStorageConnection : nsISupports {
/*
* Initialization and status
*/
/**
* Closes a database connection. C++ callers should simply set the database
* variable to NULL.
*/
void close();
/**
* whether the database is open or not
*/
readonly attribute boolean connectionReady;
/**
* The current database nsIFile. Null if the database
* connection refers to an in-memory database.
*/
readonly attribute nsIFile databaseFile;
/**
* lastInsertRowID returns the row ID from the last INSERT
* operation.
*/
readonly attribute long long lastInsertRowID;
/**
* The last error SQLite error code.
*/
readonly attribute long lastError;
/**
* The last SQLite error as a string (in english, straight from the
* sqlite library).
*/
readonly attribute AUTF8String lastErrorString;
/**
* The schema version of the database. This should not be used until the
* database is ready. The schema will be reported as zero if it is not set.
*/
attribute long schemaVersion;
/*
* Statement creation
*/
/**
* Create a mozIStorageStatement for the given SQL expression. The
* expression may use ? to indicate sequential numbered arguments,
* ?1, ?2 etc. to indicate specific numbered arguments or :name and
* $var to indicate named arguments.
*
* @param aSQLStatement The SQL statement to execute
*
* @returns a new mozIStorageStatement
*/
mozIStorageStatement createStatement(in AUTF8String aSQLStatement);
/**
* Execute a SQL expression, expecting no arguments.
*
* @param aSQLStatement The SQL statement to execute
*/
void executeSimpleSQL(in AUTF8String aSQLStatement);
/**
* Check if the given table exists.
*
* @param aTableName The table to check
* @returns TRUE if table exists, FALSE otherwise.
*/
boolean tableExists(in AUTF8String aTableName);
/**
* Check if the given index exists.
*
* @param aIndexName The index to check
* @returns TRUE if the index exists, FALSE otherwise.
*/
boolean indexExists(in AUTF8String aIndexName);
/*
* Transactions
*/
/**
* Returns true if a transaction is active on this connection.
*/
readonly attribute boolean transactionInProgress;
/**
* Begin a new transaction. sqlite default transactions are deferred.
* If a transaction is active, throws an error.
*/
void beginTransaction();
/**
* Begins a new transaction with the given type.
*/
const PRInt32 TRANSACTION_DEFERRED = 0;
const PRInt32 TRANSACTION_IMMEDIATE = 1;
const PRInt32 TRANSACTION_EXCLUSIVE = 2;
void beginTransactionAs(in PRInt32 transactionType);
/**
* Commits the current transaction. If no transaction is active,
* @throws NS_ERROR_STORAGE_NO_TRANSACTION.
*/
void commitTransaction();
/**
* Rolls back the current transaction. If no transaction is active,
* @throws NS_ERROR_STORAGE_NO_TRANSACTION.
*/
void rollbackTransaction();
/*
* Tables
*/
/**
* Create the table with the given name and schema.
*
* If the table already exists, NS_ERROR_FAILURE is thrown.
* (XXX at some point in the future it will check if the schema is
* the same as what is specified, but that doesn't happen currently.)
*
* @param aTableName the table name to be created, consisting of
* [A-Za-z0-9_], and beginning with a letter.
*
* @param aTableSchema the schema of the table; what would normally
* go between the parens in a CREATE TABLE statement: e.g., "foo
* INTEGER, bar STRING".
*
* @throws NS_ERROR_FAILURE if the table already exists or could not
* be created for any other reason.
*
*/
void createTable(in string aTableName,
in string aTableSchema);
/*
* Functions
*/
/**
* Create a new SQLite function
*
* @param aFunctionName The name of function to create, as seen in SQL.
* @param aNumArguments The number of arguments the function takes. Pass
* -1 for variable-argument functions.
* @param aFunction The instance of mozIStorageFunction, which implements
* the function in question.
*/
void createFunction(in AUTF8String aFunctionName,
in long aNumArguments,
in mozIStorageFunction aFunction);
/**
* Create a new SQLite aggregate function
*
* @param aFunctionName The name of aggregate function to create, as seen
* in SQL.
* @param aNumArguments The number of arguments the function takes. Pass
* -1 for variable-argument functions.
* @param aFunction The instance of mozIStorageAggreagteFunction,
* which implements the function in question.
*/
void createAggregateFunction(in AUTF8String aFunctionName,
in long aNumArguments,
in mozIStorageAggregateFunction aFunction);
/**
* Delete custom SQLite function (simple or aggregate one)
*
* @param aFunctionName The name of function to remove.
*/
void removeFunction(in AUTF8String aFunctionName);
/**
* Sets a progress handler. Only one handler can be registered at a time.
* If you need more than one, you need to chain them yourself.
*
* @param aGranularity The number of SQL virtual machine steps between
* progress handler callbacks.
* @param aHandler The instance of mozIStorageProgressHandler.
*
* @return previous registered handler.
*/
mozIStorageProgressHandler setProgressHandler(in PRInt32 aGranularity,
in mozIStorageProgressHandler aHandler);
/**
* Remove a progress handler.
*
* @return previous registered handler.
*/
mozIStorageProgressHandler removeProgressHandler();
/*
* Utilities
*/
/**
* Copies the current database file to the specified parent directory with the
* specified file name. If the parent directory is not specified, it places
* the backup in the same directory as the current file. This function
* ensures that the file being created is unique.
*
* @param aFileName
* The name of the new file to create.
* @param [optional] aParentDirectory
* The directory you'd like the file to be placed.
* @return The nsIFile representing the backup file.
*/
nsIFile backupDB(in AString aFileName,
[optional] in nsIFile aParentDirectory);
};