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295 строки
9.6 KiB
Plaintext
295 строки
9.6 KiB
Plaintext
/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Oracle Corporation code.
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*
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* The Initial Developer of the Original Code is
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* Oracle Corporation
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
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* Brett Wilson <brettw@gmail.com>
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* Shawn Wilsher <me@shawnwilsher.com>
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* Lev Serebryakov <lev@serebryakov.spb.ru>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface mozIStorageAggregateFunction;
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interface mozIStorageFunction;
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interface mozIStorageProgressHandler;
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interface mozIStorageStatement;
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interface nsIFile;
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/**
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* mozIStorageConnection represents a database connection attached to
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* a specific file or to the in-memory data storage. It is the
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* primary interface for interacting with a database, including
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* creating prepared statements, executing SQL, and examining database
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* errors.
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*/
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[scriptable, uuid(e42f0655-cdc3-47c6-824a-cdb88c731cb9)]
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interface mozIStorageConnection : nsISupports {
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/*
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* Initialization and status
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*/
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/**
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* Closes a database connection. C++ callers should simply set the database
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* variable to NULL.
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*/
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void close();
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/**
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* whether the database is open or not
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*/
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readonly attribute boolean connectionReady;
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/**
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* The current database nsIFile. Null if the database
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* connection refers to an in-memory database.
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*/
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readonly attribute nsIFile databaseFile;
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/**
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* lastInsertRowID returns the row ID from the last INSERT
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* operation.
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*/
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readonly attribute long long lastInsertRowID;
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/**
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* The last error SQLite error code.
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*/
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readonly attribute long lastError;
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/**
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* The last SQLite error as a string (in english, straight from the
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* sqlite library).
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*/
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readonly attribute AUTF8String lastErrorString;
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/**
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* The schema version of the database. This should not be used until the
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* database is ready. The schema will be reported as zero if it is not set.
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*/
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attribute long schemaVersion;
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/*
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* Statement creation
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*/
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/**
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* Create a mozIStorageStatement for the given SQL expression. The
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* expression may use ? to indicate sequential numbered arguments,
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* ?1, ?2 etc. to indicate specific numbered arguments or :name and
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* $var to indicate named arguments.
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*
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* @param aSQLStatement The SQL statement to execute
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*
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* @returns a new mozIStorageStatement
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*/
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mozIStorageStatement createStatement(in AUTF8String aSQLStatement);
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/**
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* Execute a SQL expression, expecting no arguments.
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*
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* @param aSQLStatement The SQL statement to execute
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*/
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void executeSimpleSQL(in AUTF8String aSQLStatement);
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/**
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* Check if the given table exists.
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*
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* @param aTableName The table to check
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* @returns TRUE if table exists, FALSE otherwise.
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*/
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boolean tableExists(in AUTF8String aTableName);
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/**
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* Check if the given index exists.
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*
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* @param aIndexName The index to check
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* @returns TRUE if the index exists, FALSE otherwise.
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*/
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boolean indexExists(in AUTF8String aIndexName);
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/*
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* Transactions
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*/
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/**
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* Returns true if a transaction is active on this connection.
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*/
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readonly attribute boolean transactionInProgress;
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/**
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* Begin a new transaction. sqlite default transactions are deferred.
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* If a transaction is active, throws an error.
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*/
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void beginTransaction();
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/**
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* Begins a new transaction with the given type.
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*/
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const PRInt32 TRANSACTION_DEFERRED = 0;
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const PRInt32 TRANSACTION_IMMEDIATE = 1;
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const PRInt32 TRANSACTION_EXCLUSIVE = 2;
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void beginTransactionAs(in PRInt32 transactionType);
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/**
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* Commits the current transaction. If no transaction is active,
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* @throws NS_ERROR_STORAGE_NO_TRANSACTION.
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*/
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void commitTransaction();
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/**
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* Rolls back the current transaction. If no transaction is active,
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* @throws NS_ERROR_STORAGE_NO_TRANSACTION.
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*/
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void rollbackTransaction();
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/*
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* Tables
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*/
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/**
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* Create the table with the given name and schema.
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*
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* If the table already exists, NS_ERROR_FAILURE is thrown.
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* (XXX at some point in the future it will check if the schema is
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* the same as what is specified, but that doesn't happen currently.)
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*
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* @param aTableName the table name to be created, consisting of
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* [A-Za-z0-9_], and beginning with a letter.
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*
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* @param aTableSchema the schema of the table; what would normally
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* go between the parens in a CREATE TABLE statement: e.g., "foo
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* INTEGER, bar STRING".
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*
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* @throws NS_ERROR_FAILURE if the table already exists or could not
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* be created for any other reason.
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*
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*/
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void createTable(in string aTableName,
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in string aTableSchema);
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/*
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* Functions
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*/
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/**
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* Create a new SQLite function
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*
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* @param aFunctionName The name of function to create, as seen in SQL.
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* @param aNumArguments The number of arguments the function takes. Pass
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* -1 for variable-argument functions.
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* @param aFunction The instance of mozIStorageFunction, which implements
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* the function in question.
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*/
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void createFunction(in AUTF8String aFunctionName,
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in long aNumArguments,
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in mozIStorageFunction aFunction);
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/**
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* Create a new SQLite aggregate function
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*
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* @param aFunctionName The name of aggregate function to create, as seen
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* in SQL.
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* @param aNumArguments The number of arguments the function takes. Pass
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* -1 for variable-argument functions.
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* @param aFunction The instance of mozIStorageAggreagteFunction,
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* which implements the function in question.
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*/
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void createAggregateFunction(in AUTF8String aFunctionName,
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in long aNumArguments,
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in mozIStorageAggregateFunction aFunction);
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/**
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* Delete custom SQLite function (simple or aggregate one)
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*
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* @param aFunctionName The name of function to remove.
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*/
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void removeFunction(in AUTF8String aFunctionName);
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/**
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* Sets a progress handler. Only one handler can be registered at a time.
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* If you need more than one, you need to chain them yourself.
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*
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* @param aGranularity The number of SQL virtual machine steps between
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* progress handler callbacks.
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* @param aHandler The instance of mozIStorageProgressHandler.
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*
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* @return previous registered handler.
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*/
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mozIStorageProgressHandler setProgressHandler(in PRInt32 aGranularity,
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in mozIStorageProgressHandler aHandler);
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/**
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* Remove a progress handler.
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*
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* @return previous registered handler.
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*/
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mozIStorageProgressHandler removeProgressHandler();
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/*
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* Utilities
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*/
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/**
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* Copies the current database file to the specified parent directory with the
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* specified file name. If the parent directory is not specified, it places
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* the backup in the same directory as the current file. This function
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* ensures that the file being created is unique.
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*
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* @param aFileName
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* The name of the new file to create.
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* @param [optional] aParentDirectory
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* The directory you'd like the file to be placed.
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* @return The nsIFile representing the backup file.
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*/
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nsIFile backupDB(in AString aFileName,
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[optional] in nsIFile aParentDirectory);
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/**
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* This is used to preload the database cache. It loads pages from the
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* start of the database file until the memory cache (specified by
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* "PRAGMA cache_size=") is full or the entire file is read.
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*
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* The cache MUST be active on the database for this to work. This means
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* that you must have a transaction open on the connection, or have a
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* transaction open on another connection that shares the same pager cache.
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* This cached data will go away when the transaction is closed.
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*
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* This preload operation can dramatically speed up read operations because
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* the data is loaded as one large block. Normally, pages are read in on
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* demand, which can cause many disk seeks.
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*/
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void preload();
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};
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