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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 sts=2 et
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"
#include "mozIStorageBindingParams.idl"
interface mozIStorageConnection;
interface mozIStorageStatementCallback;
interface mozIStoragePendingStatement;
interface mozIStorageBindingParams;
interface mozIStorageBindingParamsArray;
/**
* The base interface for both pure asynchronous storage statements
* (mozIStorageAsyncStatement) and 'classic' storage statements
* (mozIStorageStatement) that can be used for both synchronous and asynchronous
* purposes.
*/
[scriptable, builtinclass, uuid(16ca67aa-1325-43e2-aac7-859afd1590b2)]
interface mozIStorageBaseStatement : mozIStorageBindingParams {
/**
* Finalizes a statement so you can successfully close a database connection.
* Once a statement has been finalized it can no longer be used for any
* purpose.
*
* Statements are implicitly finalized when their reference counts hits zero.
* If you are a native (C++) caller this is accomplished by setting all of
* your nsCOMPtr instances to be NULL. If you are operating from JavaScript
* code then you cannot rely on this behavior because of the involvement of
* garbage collection.
*
* When finalizing an asynchronous statement you do not need to worry about
* whether the statement has actually been executed by the asynchronous
* thread; you just need to call finalize after your last call to executeAsync
* involving the statement. However, you do need to use asyncClose instead of
* close on the connection if any statements have been used asynchronously.
*/
void finalize();
/**
* Binds the array of parameters to the statement. When executeAsync is
* called, all the parameters in aParameters are bound and then executed.
*
* @param aParameters
* The array of parameters to bind to the statement upon execution.
*
* @note This is only works on statements being used asynchronously.
*/
void bindParameters(in mozIStorageBindingParamsArray aParameters);
/**
* Creates a new mozIStorageBindingParamsArray that can be used to bind
* multiple sets of data to a statement with bindParameters.
*
* @return a mozIStorageBindingParamsArray that multiple sets of parameters
* can be bound to.
*
* @note This is only useful for statements being used asynchronously.
*/
mozIStorageBindingParamsArray newBindingParamsArray();
/**
* Execute a query asynchronously using any currently bound parameters. This
* statement can be reused immediately, and reset does not need to be called.
*
* @note If you have any custom defined functions, they must be re-entrant
* since they can be called on multiple threads.
*
* @param aCallback [optional]
* The callback object that will be notified of progress, errors, and
* completion.
* @return an object that can be used to cancel the statements execution.
*/
mozIStoragePendingStatement executeAsync(
[optional] in mozIStorageStatementCallback aCallback
);
/**
* The statement is not usable, either because it failed to initialize or
* was explicitly finalized.
*/
const long MOZ_STORAGE_STATEMENT_INVALID = 0;
/**
* The statement is usable.
*/
const long MOZ_STORAGE_STATEMENT_READY = 1;
/**
* Indicates that the statement is executing and the row getters may be used.
*
* @note This is only relevant for mozIStorageStatement instances being used
* in a synchronous fashion.
*/
const long MOZ_STORAGE_STATEMENT_EXECUTING = 2;
/**
* Find out whether the statement is usable (has not been finalized).
*/
readonly attribute long state;
/**
* Escape a string for SQL LIKE search.
*
* @note Consumers will have to use same escape char when doing statements
* such as: ...LIKE '?1' ESCAPE '/'...
*
* @param aValue
* The string to escape for SQL LIKE.
* @param aEscapeChar
* The escape character.
* @return an AString of an escaped version of aValue
* (%, _ and the escape char are escaped with the escape char)
* For example, we will convert "foo/bar_baz%20cheese"
* into "foo//bar/_baz/%20cheese" (if the escape char is '/').
*/
AString escapeStringForLIKE(in AString aValue, in wchar aEscapeChar);
/**
* The same as above, but for UTF8 strings.
*/
AUTF8String escapeUTF8StringForLIKE(in AUTF8String aValue,
in char aEscapeChar);
};