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405 строки
14 KiB
Plaintext
405 строки
14 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 mozIStorageCompletionCallback;
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interface mozIStorageFunction;
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interface mozIStorageProgressHandler;
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interface mozIStorageBaseStatement;
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interface mozIStorageStatement;
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interface mozIStorageAsyncStatement;
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interface mozIStorageStatementCallback;
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interface mozIStoragePendingStatement;
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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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* @threadsafe
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*/
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[scriptable, uuid(b2a4b534-f92e-4387-9bd9-d10408173925)]
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interface mozIStorageConnection : nsISupports {
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/**
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* The default size for SQLite database pages used by mozStorage for new
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* databases.
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* This value must stay in sync with the SQLITE_DEFAULT_PAGE_SIZE define in
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* /db/sqlite3/src/Makefile.in
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*/
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const long DEFAULT_PAGE_SIZE = 32768;
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/**
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* Closes a database connection. Callers must finalize all statements created
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* for this connection prior to calling this method. It is illegal to use
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* call this method if any asynchronous statements have been executed on this
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* connection.
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*
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* @throws NS_ERROR_UNEXPECTED
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* If any statement has been executed asynchronously on this object.
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* @throws NS_ERROR_UNEXPECTED
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* If is called on a thread other than the one that opened it.
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*/
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void close();
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/**
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* Asynchronously closes a database connection, allowing all pending
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* asynchronous statements to complete first.
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*
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* @param aCallback [optional]
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* A callback that will be notified when the close is completed.
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*
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* @throws NS_ERROR_UNEXPECTED
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* If is called on a thread other than the one that opened it.
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*/
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void asyncClose([optional] in mozIStorageCompletionCallback aCallback);
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/**
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* Clones a database and makes the clone read only if needed.
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*
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* @note If your connection is already read-only, you will get a read-only
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* clone.
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* @note Due to a bug in SQLite, if you use the shared cache (openDatabase),
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* you end up with the same privileges as the first connection opened
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* regardless of what is specified in aReadOnly.
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* @note The following pragmas are copied over to a read-only clone:
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* - cache_size
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* - temp_store
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* The following pragmas are copied over to a writeable clone:
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* - cache_size
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* - temp_store
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* - foreign_keys
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* - journal_size_limit
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* - synchronous
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* - wal_autocheckpoint
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*
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* @throws NS_ERROR_UNEXPECTED
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* If this connection is a memory database.
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*
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* @param aReadOnly
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* If true, the returned database should be put into read-only mode.
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* Defaults to false.
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* @return the cloned database connection.
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*/
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mozIStorageConnection clone([optional] in boolean aReadOnly);
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/**
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* Indicates if the connection is open and ready to use. This will be false
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* if the connection failed to open, or it has been closed.
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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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* affectedRows returns the number of database rows that were changed or
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* inserted or deleted by last operation.
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*/
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readonly attribute long affectedRows;
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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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* 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
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* The SQL statement to execute.
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* @return a new mozIStorageStatement
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*/
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mozIStorageStatement createStatement(in AUTF8String aSQLStatement);
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/**
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* Create an asynchronous statement (mozIStorageAsyncStatement) for the given
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* SQL expression. An asynchronous statement can only be used to dispatch
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* asynchronous requests to the asynchronous execution thread and cannot be
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* used to take any synchronous actions on the database.
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*
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* The 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
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* The SQL statement to execute.
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* @return a new mozIStorageAsyncStatement
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*/
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mozIStorageAsyncStatement createAsyncStatement(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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* Execute an array of queries created with this connection asynchronously
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* using any currently bound parameters. The statements are ran wrapped in a
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* transaction. These statements can be reused immediately, and reset does
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* not need to be called.
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*
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* Note: If you have any custom defined functions, they must be re-entrant
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* since they can be called on multiple threads.
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*
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* @param aStatements
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* The array of statements to execute asynchronously, in the order they
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* are given in the array.
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* @param aNumStatements
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* The number of statements in aStatements.
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* @param aCallback [optional]
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* The callback object that will be notified of progress, errors, and
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* completion.
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* @return an object that can be used to cancel the statements execution.
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*/
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mozIStoragePendingStatement executeAsync(
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[array, size_is(aNumStatements)] in mozIStorageBaseStatement aStatements,
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in unsigned long aNumStatements,
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[optional] in mozIStorageStatementCallback aCallback
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);
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/**
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* Check if the given table exists.
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*
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* @param aTableName
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* The table to check
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* @return 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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* @return 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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* 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_UNEXPECTED.
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* @throws NS_ERROR_NOT_INITIALIZED.
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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_UNEXPECTED.
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* @throws NS_ERROR_NOT_INITIALIZED.
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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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* 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
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* The table name to be created, consisting of [A-Za-z0-9_], and
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* beginning with a letter.
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* @param aTableSchema
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* The schema of the table; what would normally go between the parens
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* in a CREATE TABLE statement: e.g., "foo INTEGER, bar STRING".
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*
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* @throws NS_ERROR_FAILURE
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* If the table already exists or could not be created for any other
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* reason.
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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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* Create a new SQL function. If you use your connection on multiple threads,
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* your function needs to be threadsafe, or it should only be called on one
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* thread.
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*
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* @param aFunctionName
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* The name of function to create, as seen in SQL.
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* @param aNumArguments
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* The number of arguments the function takes. Pass -1 for
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* variable-argument functions.
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* @param aFunction
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* The instance of mozIStorageFunction, which implements the function
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* 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 SQL aggregate function. If you use your connection on
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* multiple threads, your function needs to be threadsafe, or it should only
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* be called on one thread.
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*
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* @param aFunctionName
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* The name of aggregate function to create, as seen in SQL.
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* @param aNumArguments
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* The number of arguments the function takes. Pass -1 for
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* variable-argument functions.
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* @param aFunction
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* The instance of mozIStorageAggreagteFunction, which implements the
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* 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 SQL function (simple or aggregate one).
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*
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* @param aFunctionName
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* 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. This progress
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* handler should be threadsafe if you use this connection object on more than
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* one thread.
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*
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* @param aGranularity
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* The number of SQL virtual machine steps between progress handler
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* callbacks.
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* @param aHandler
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* The instance of mozIStorageProgressHandler.
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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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* Controls SQLITE_FCNTL_CHUNK_SIZE setting in sqlite. This helps avoid fragmentation
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* by growing/shrinking the database file in SQLITE_FCNTL_CHUNK_SIZE increments. To
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* conserve memory on systems short on storage space, this function will have no effect
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* on mobile devices or if less than 500MiB of space is left available.
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*
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* @param aIncrement
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* The database file will grow in multiples of chunkSize.
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* @param aDatabaseName
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* Sqlite database name. "" means pass NULL for zDbName to sqlite3_file_control.
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* See http://sqlite.org/c3ref/file_control.html for more details.
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* @throws NS_ERROR_FILE_TOO_BIG
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* If the system is short on storage space.
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*/
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void setGrowthIncrement(in PRInt32 aIncrement, in AUTF8String aDatabaseName);
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/**
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* Enable a predefined virtual table implementation.
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*
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* @param aModuleName
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* The module to enable. Only "filesystem" is currently supported.
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*
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* @throws NS_ERROR_FAILURE
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* For unknown module names.
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*/
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[noscript] void enableModule(in ACString aModuleName);
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};
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