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6878ccd6f4
gecko/dom/indexedDB/IDBIndex.cpp
Ben Turner 21827132d6 Bug 592801. a=crashfix
2010-09-09 21:54:25 -07:00

1403 lines
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* ***** 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 Indexed Database.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Shawn Wilsher <me@shawnwilsher.com>
*
* 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 "IDBIndex.h"
#include "nsIIDBDatabaseException.h"
#include "nsIIDBKeyRange.h"
#include "nsDOMClassInfo.h"
#include "nsThreadUtils.h"
#include "mozilla/storage.h"
#include "AsyncConnectionHelper.h"
#include "IDBCursor.h"
#include "IDBEvents.h"
#include "IDBObjectStore.h"
#include "IDBTransaction.h"
#include "DatabaseInfo.h"
USING_INDEXEDDB_NAMESPACE
namespace {
class GetHelper : public AsyncConnectionHelper
{
public:
GetHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
const Key& aKey,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement)
: AsyncConnectionHelper(aTransaction, aRequest), mKey(aKey), mId(aId),
mUnique(aUnique), mAutoIncrement(aAutoIncrement)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 GetSuccessResult(nsIWritableVariant* aResult);
protected:
// In-params.
Key mKey;
const PRInt64 mId;
const bool mUnique;
const bool mAutoIncrement;
};
class GetObjectHelper : public GetHelper
{
public:
GetObjectHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
const Key& aKey,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement)
: GetHelper(aTransaction, aRequest, aKey, aId, aUnique, aAutoIncrement)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 OnSuccess(nsIDOMEventTarget* aTarget);
protected:
nsString mValue;
};
class GetAllHelper : public GetHelper
{
public:
GetAllHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
const Key& aKey,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement,
const PRUint32 aLimit)
: GetHelper(aTransaction, aRequest, aKey, aId, aUnique, aAutoIncrement),
mLimit(aLimit)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 OnSuccess(nsIDOMEventTarget* aTarget);
protected:
const PRUint32 mLimit;
nsTArray<Key> mKeys;
};
class GetAllObjectsHelper : public GetHelper
{
public:
GetAllObjectsHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
const Key& aKey,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement,
const PRUint32 aLimit)
: GetHelper(aTransaction, aRequest, aKey, aId, aUnique, aAutoIncrement),
mLimit(aLimit)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 OnSuccess(nsIDOMEventTarget* aTarget);
protected:
const PRUint32 mLimit;
nsTArray<nsString> mValues;
};
class OpenCursorHelper : public AsyncConnectionHelper
{
public:
OpenCursorHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
IDBIndex* aIndex,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement,
const Key& aLeftKey,
const Key& aRightKey,
PRUint16 aKeyRangeFlags,
PRUint16 aDirection,
PRBool aPreload)
: AsyncConnectionHelper(aTransaction, aRequest), mIndex(aIndex), mId(aId),
mUnique(aUnique), mAutoIncrement(aAutoIncrement), mLeftKey(aLeftKey),
mRightKey(aRightKey), mKeyRangeFlags(aKeyRangeFlags),
mDirection(aDirection), mPreload(aPreload)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 GetSuccessResult(nsIWritableVariant* aResult);
void ReleaseMainThreadObjects()
{
mIndex = nsnull;
AsyncConnectionHelper::ReleaseMainThreadObjects();
}
private:
// In-params.
nsRefPtr<IDBIndex> mIndex;
const PRInt64 mId;
const bool mUnique;
const bool mAutoIncrement;
const Key mLeftKey;
const Key mRightKey;
const PRUint16 mKeyRangeFlags;
const PRUint16 mDirection;
const PRBool mPreload;
// Out-params.
nsTArray<KeyKeyPair> mData;
};
class OpenObjectCursorHelper : public AsyncConnectionHelper
{
public:
OpenObjectCursorHelper(IDBTransaction* aTransaction,
IDBRequest* aRequest,
IDBIndex* aIndex,
PRInt64 aId,
bool aUnique,
bool aAutoIncrement,
const Key& aLeftKey,
const Key& aRightKey,
PRUint16 aKeyRangeFlags,
PRUint16 aDirection,
PRBool aPreload)
: AsyncConnectionHelper(aTransaction, aRequest), mIndex(aIndex), mId(aId),
mUnique(aUnique), mAutoIncrement(aAutoIncrement), mLeftKey(aLeftKey),
mRightKey(aRightKey), mKeyRangeFlags(aKeyRangeFlags),
mDirection(aDirection), mPreload(aPreload)
{ }
PRUint16 DoDatabaseWork(mozIStorageConnection* aConnection);
PRUint16 GetSuccessResult(nsIWritableVariant* aResult);
void ReleaseMainThreadObjects()
{
mIndex = nsnull;
AsyncConnectionHelper::ReleaseMainThreadObjects();
}
private:
// In-params.
nsRefPtr<IDBIndex> mIndex;
const PRInt64 mId;
const bool mUnique;
const bool mAutoIncrement;
const Key mLeftKey;
const Key mRightKey;
const PRUint16 mKeyRangeFlags;
const PRUint16 mDirection;
const PRBool mPreload;
// Out-params.
nsTArray<KeyValuePair> mData;
};
inline
already_AddRefed<IDBRequest>
GenerateRequest(IDBIndex* aIndex)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
IDBDatabase* database = aIndex->ObjectStore()->Transaction()->Database();
return IDBRequest::Create(static_cast<nsPIDOMEventTarget*>(aIndex),
database->ScriptContext(), database->Owner());
}
} // anonymous namespace
// static
already_AddRefed<IDBIndex>
IDBIndex::Create(IDBObjectStore* aObjectStore,
const IndexInfo* aIndexInfo)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
NS_ASSERTION(aObjectStore, "Null pointer!");
NS_ASSERTION(aIndexInfo, "Null pointer!");
IDBDatabase* database = aObjectStore->Transaction()->Database();
nsRefPtr<IDBIndex> index = new IDBIndex();
index->mScriptContext = database->ScriptContext();
index->mOwner = database->Owner();
index->mObjectStore = aObjectStore;
index->mId = aIndexInfo->id;
index->mName = aIndexInfo->name;
index->mKeyPath = aIndexInfo->keyPath;
index->mUnique = aIndexInfo->unique;
index->mAutoIncrement = aIndexInfo->autoIncrement;
return index.forget();
}
IDBIndex::IDBIndex()
: mId(LL_MININT),
mUnique(false),
mAutoIncrement(false)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
}
IDBIndex::~IDBIndex()
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
if (mListenerManager) {
mListenerManager->Disconnect();
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(IDBIndex)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(IDBIndex,
nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR_AMBIGUOUS(mObjectStore,
nsPIDOMEventTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mOnErrorListener)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(IDBIndex,
nsDOMEventTargetHelper)
// Don't unlink mObjectStore!
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mOnErrorListener)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(IDBIndex)
NS_INTERFACE_MAP_ENTRY(nsIIDBIndex)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(IDBIndex)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(IDBIndex, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(IDBIndex, nsDOMEventTargetHelper)
DOMCI_DATA(IDBIndex, IDBIndex)
NS_IMETHODIMP
IDBIndex::GetName(nsAString& aName)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
aName.Assign(mName);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::GetStoreName(nsAString& aStoreName)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
return mObjectStore->GetName(aStoreName);
}
NS_IMETHODIMP
IDBIndex::GetKeyPath(nsAString& aKeyPath)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
aKeyPath.Assign(mKeyPath);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::GetUnique(PRBool* aUnique)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
*aUnique = mUnique;
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::Get(nsIVariant* aKey,
nsIIDBRequest** _retval)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
Key key;
nsresult rv = IDBObjectStore::GetKeyFromVariant(aKey, key);
NS_ENSURE_SUCCESS(rv, rv);
if (key.IsUnset() || key.IsNull()) {
return NS_ERROR_INVALID_ARG;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<GetHelper> helper =
new GetHelper(transaction, request, key, mId, mUnique, mAutoIncrement);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::GetObject(nsIVariant* aKey,
nsIIDBRequest** _retval)
{
NS_PRECONDITION(NS_IsMainThread(), "Wrong thread!");
Key key;
nsresult rv = IDBObjectStore::GetKeyFromVariant(aKey, key);
NS_ENSURE_SUCCESS(rv, rv);
if (key.IsUnset() || key.IsNull()) {
return NS_ERROR_INVALID_ARG;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<GetObjectHelper> helper =
new GetObjectHelper(transaction, request, key, mId, mUnique,
mAutoIncrement);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::GetAll(nsIVariant* aKey,
PRUint32 aLimit,
PRUint8 aOptionalArgCount,
nsIIDBRequest** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
Key key;
nsresult rv = IDBObjectStore::GetKeyFromVariant(aKey, key);
NS_ENSURE_SUCCESS(rv, rv);
if (key.IsNull()) {
key = Key::UNSETKEY;
}
if (aOptionalArgCount < 2) {
aLimit = PR_UINT32_MAX;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<GetAllHelper> helper =
new GetAllHelper(transaction, request, key, mId, mUnique, mAutoIncrement,
aLimit);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::GetAllObjects(nsIVariant* aKey,
PRUint32 aLimit,
PRUint8 aOptionalArgCount,
nsIIDBRequest** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
Key key;
nsresult rv = IDBObjectStore::GetKeyFromVariant(aKey, key);
NS_ENSURE_SUCCESS(rv, rv);
if (key.IsNull()) {
key = Key::UNSETKEY;
}
if (aOptionalArgCount < 2) {
aLimit = PR_UINT32_MAX;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<GetAllObjectsHelper> helper =
new GetAllObjectsHelper(transaction, request, key, mId, mUnique,
mAutoIncrement, aLimit);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::OpenCursor(nsIIDBKeyRange* aKeyRange,
PRUint16 aDirection,
PRBool aPreload,
PRUint8 aOptionalArgCount,
nsIIDBRequest** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (!mObjectStore->TransactionIsOpen()) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv;
Key leftKey, rightKey;
PRUint16 keyRangeFlags = 0;
if (aKeyRange) {
rv = aKeyRange->GetFlags(&keyRangeFlags);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIVariant> variant;
rv = aKeyRange->GetLeft(getter_AddRefs(variant));
NS_ENSURE_SUCCESS(rv, rv);
rv = IDBObjectStore::GetKeyFromVariant(variant, leftKey);
NS_ENSURE_SUCCESS(rv, rv);
rv = aKeyRange->GetRight(getter_AddRefs(variant));
NS_ENSURE_SUCCESS(rv, rv);
rv = IDBObjectStore::GetKeyFromVariant(variant, rightKey);
NS_ENSURE_SUCCESS(rv, rv);
}
if (aOptionalArgCount >= 2) {
if (aDirection != nsIIDBCursor::NEXT &&
aDirection != nsIIDBCursor::NEXT_NO_DUPLICATE &&
aDirection != nsIIDBCursor::PREV &&
aDirection != nsIIDBCursor::PREV_NO_DUPLICATE) {
return NS_ERROR_INVALID_ARG;
}
}
else {
aDirection = nsIIDBCursor::NEXT;
}
if (aPreload) {
NS_NOTYETIMPLEMENTED("Implement me!");
return NS_ERROR_NOT_IMPLEMENTED;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<OpenCursorHelper> helper =
new OpenCursorHelper(transaction, request, this, mId, mUnique,
mAutoIncrement, leftKey, rightKey, keyRangeFlags,
aDirection, aPreload);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
IDBIndex::OpenObjectCursor(nsIIDBKeyRange* aKeyRange,
PRUint16 aDirection,
PRBool aPreload,
PRUint8 aOptionalArgCount,
nsIIDBRequest** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (!mObjectStore->TransactionIsOpen()) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv;
Key leftKey, rightKey;
PRUint16 keyRangeFlags = 0;
if (aKeyRange) {
rv = aKeyRange->GetFlags(&keyRangeFlags);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIVariant> variant;
rv = aKeyRange->GetLeft(getter_AddRefs(variant));
NS_ENSURE_SUCCESS(rv, rv);
rv = IDBObjectStore::GetKeyFromVariant(variant, leftKey);
NS_ENSURE_SUCCESS(rv, rv);
rv = aKeyRange->GetRight(getter_AddRefs(variant));
NS_ENSURE_SUCCESS(rv, rv);
rv = IDBObjectStore::GetKeyFromVariant(variant, rightKey);
NS_ENSURE_SUCCESS(rv, rv);
}
if (aOptionalArgCount >= 2) {
if (aDirection != nsIIDBCursor::NEXT &&
aDirection != nsIIDBCursor::NEXT_NO_DUPLICATE &&
aDirection != nsIIDBCursor::PREV &&
aDirection != nsIIDBCursor::PREV_NO_DUPLICATE) {
return NS_ERROR_INVALID_ARG;
}
}
else {
aDirection = nsIIDBCursor::NEXT;
}
if (aPreload) {
NS_NOTYETIMPLEMENTED("Implement me!");
return NS_ERROR_NOT_IMPLEMENTED;
}
IDBTransaction* transaction = mObjectStore->Transaction();
nsRefPtr<IDBRequest> request = GenerateRequest(this);
NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
nsRefPtr<OpenObjectCursorHelper> helper =
new OpenObjectCursorHelper(transaction, request, this, mId, mUnique,
mAutoIncrement, leftKey, rightKey, keyRangeFlags,
aDirection, aPreload);
rv = helper->DispatchToTransactionPool();
NS_ENSURE_SUCCESS(rv, rv);
request.forget(_retval);
return NS_OK;
}
PRUint16
GetHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
nsCOMPtr<mozIStorageStatement> stmt =
mTransaction->IndexGetStatement(mUnique, mAutoIncrement);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("index_id"), mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_NAMED_LITERAL_CSTRING(value, "value");
if (mKey.IsInt()) {
rv = stmt->BindInt64ByName(value, mKey.IntValue());
}
else if (mKey.IsString()) {
rv = stmt->BindStringByName(value, mKey.StringValue());
}
else {
NS_NOTREACHED("Bad key type!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
mKey = Key::UNSETKEY;
PRBool hasResult;
rv = stmt->ExecuteStep(&hasResult);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (hasResult) {
PRInt32 keyType;
rv = stmt->GetTypeOfIndex(0, &keyType);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_ASSERTION(keyType == mozIStorageStatement::VALUE_TYPE_INTEGER ||
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad key type!");
if (keyType == mozIStorageStatement::VALUE_TYPE_INTEGER) {
mKey = stmt->AsInt64(0);
}
else if (keyType == mozIStorageStatement::VALUE_TYPE_TEXT) {
rv = stmt->GetString(0, mKey.ToString());
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
NS_NOTREACHED("Bad SQLite type!");
}
}
return OK;
}
PRUint16
GetHelper::GetSuccessResult(nsIWritableVariant* aResult)
{
NS_ASSERTION(!mKey.IsNull(), "Badness!");
if (mKey.IsUnset()) {
aResult->SetAsEmpty();
}
else if (mKey.IsString()) {
aResult->SetAsAString(mKey.StringValue());
}
else if (mKey.IsInt()) {
aResult->SetAsInt64(mKey.IntValue());
}
else {
NS_NOTREACHED("Unknown key type!");
}
return OK;
}
PRUint16
GetObjectHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
nsCOMPtr<mozIStorageStatement> stmt =
mTransaction->IndexGetObjectStatement(mUnique, mAutoIncrement);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("index_id"), mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_NAMED_LITERAL_CSTRING(value, "value");
if (mKey.IsInt()) {
rv = stmt->BindInt64ByName(value, mKey.IntValue());
}
else if (mKey.IsString()) {
rv = stmt->BindStringByName(value, mKey.StringValue());
}
else {
NS_NOTREACHED("Bad key type!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
mKey = Key::UNSETKEY;
PRBool hasResult;
rv = stmt->ExecuteStep(&hasResult);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (hasResult) {
rv = stmt->GetString(0, mValue);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
mValue.SetIsVoid(PR_TRUE);
}
return OK;
}
PRUint16
GetObjectHelper::OnSuccess(nsIDOMEventTarget* aTarget)
{
nsRefPtr<GetSuccessEvent> event(new GetSuccessEvent(mValue));
nsresult rv = event->Init(mRequest, mTransaction);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
PRBool dummy;
aTarget->DispatchEvent(static_cast<nsDOMEvent*>(event), &dummy);
return OK;
}
PRUint16
GetAllHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
if (!mKeys.SetCapacity(50)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
nsCString keyColumn;
nsCString tableName;
if (mAutoIncrement) {
keyColumn.AssignLiteral("ai_object_data_id");
if (mUnique) {
tableName.AssignLiteral("ai_unique_index_data");
}
else {
tableName.AssignLiteral("ai_index_data");
}
}
else {
keyColumn.AssignLiteral("object_data_key");
if (mUnique) {
tableName.AssignLiteral("unique_index_data");
}
else {
tableName.AssignLiteral("index_data");
}
}
NS_NAMED_LITERAL_CSTRING(indexId, "index_id");
NS_NAMED_LITERAL_CSTRING(value, "value");
nsCString keyClause;
if (!mKey.IsUnset()) {
keyClause = NS_LITERAL_CSTRING(" AND ") + value +
NS_LITERAL_CSTRING(" = :") + value;
}
nsCString limitClause;
if (mLimit != PR_UINT32_MAX) {
limitClause = NS_LITERAL_CSTRING(" LIMIT ");
limitClause.AppendInt(mLimit);
}
nsCString query = NS_LITERAL_CSTRING("SELECT ") + keyColumn +
NS_LITERAL_CSTRING(" FROM ") + tableName +
NS_LITERAL_CSTRING(" WHERE ") + indexId +
NS_LITERAL_CSTRING(" = :") + indexId + keyClause +
limitClause;
nsCOMPtr<mozIStorageStatement> stmt = mTransaction->GetCachedStatement(query);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(indexId, mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (!mKey.IsUnset()) {
if (mKey.IsInt()) {
rv = stmt->BindInt64ByName(value, mKey.IntValue());
}
else if (mKey.IsString()) {
rv = stmt->BindStringByName(value, mKey.StringValue());
}
else {
NS_NOTREACHED("Bad key type!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
PRBool hasResult;
while(NS_SUCCEEDED((rv = stmt->ExecuteStep(&hasResult))) && hasResult) {
if (mKeys.Capacity() == mKeys.Length()) {
if (!mKeys.SetCapacity(mKeys.Capacity() * 2)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
}
Key* key = mKeys.AppendElement();
NS_ASSERTION(key, "This shouldn't fail!");
PRInt32 keyType;
rv = stmt->GetTypeOfIndex(0, &keyType);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_ASSERTION(keyType == mozIStorageStatement::VALUE_TYPE_INTEGER ||
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad key type!");
if (keyType == mozIStorageStatement::VALUE_TYPE_INTEGER) {
*key = stmt->AsInt64(0);
}
else if (keyType == mozIStorageStatement::VALUE_TYPE_TEXT) {
rv = stmt->GetString(0, key->ToString());
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
NS_NOTREACHED("Bad SQLite type!");
}
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
return OK;
}
PRUint16
GetAllHelper::OnSuccess(nsIDOMEventTarget* aTarget)
{
nsRefPtr<GetAllKeySuccessEvent> event(new GetAllKeySuccessEvent(mKeys));
NS_ASSERTION(mKeys.IsEmpty(), "Should have swapped!");
nsresult rv = event->Init(mRequest, mTransaction);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
PRBool dummy;
aTarget->DispatchEvent(static_cast<nsDOMEvent*>(event), &dummy);
return OK;
}
PRUint16
GetAllObjectsHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
if (!mValues.SetCapacity(50)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
nsCString dataTableName;
nsCString objectDataId;
nsCString indexTableName;
if (mAutoIncrement) {
dataTableName.AssignLiteral("ai_object_data");
objectDataId.AssignLiteral("ai_object_data_id");
if (mUnique) {
indexTableName.AssignLiteral("ai_unique_index_data");
}
else {
indexTableName.AssignLiteral("ai_index_data");
}
}
else {
dataTableName.AssignLiteral("object_data");
objectDataId.AssignLiteral("object_data_id");
if (mUnique) {
indexTableName.AssignLiteral("unique_index_data");
}
else {
indexTableName.AssignLiteral("index_data");
}
}
NS_NAMED_LITERAL_CSTRING(indexId, "index_id");
NS_NAMED_LITERAL_CSTRING(value, "value");
nsCString keyClause;
if (!mKey.IsUnset()) {
keyClause = NS_LITERAL_CSTRING(" AND ") + value +
NS_LITERAL_CSTRING(" = :") + value;
}
nsCString limitClause;
if (mLimit != PR_UINT32_MAX) {
limitClause = NS_LITERAL_CSTRING(" LIMIT ");
limitClause.AppendInt(mLimit);
}
nsCString query = NS_LITERAL_CSTRING("SELECT data FROM ") + dataTableName +
NS_LITERAL_CSTRING(" INNER JOIN ") + indexTableName +
NS_LITERAL_CSTRING(" ON ") + dataTableName +
NS_LITERAL_CSTRING(".id = ") + indexTableName +
NS_LITERAL_CSTRING(".") + objectDataId +
NS_LITERAL_CSTRING(" WHERE ") + indexId +
NS_LITERAL_CSTRING(" = :") + indexId + keyClause +
limitClause;
nsCOMPtr<mozIStorageStatement> stmt = mTransaction->GetCachedStatement(query);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(indexId, mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (!mKey.IsUnset()) {
if (mKey.IsInt()) {
rv = stmt->BindInt64ByName(value, mKey.IntValue());
}
else if (mKey.IsString()) {
rv = stmt->BindStringByName(value, mKey.StringValue());
}
else {
NS_NOTREACHED("Bad key type!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
PRBool hasResult;
while(NS_SUCCEEDED((rv = stmt->ExecuteStep(&hasResult))) && hasResult) {
if (mValues.Capacity() == mValues.Length()) {
if (!mValues.SetCapacity(mValues.Capacity() * 2)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
}
nsString* value = mValues.AppendElement();
NS_ASSERTION(value, "This shouldn't fail!");
#ifdef DEBUG
{
PRInt32 keyType;
NS_ASSERTION(NS_SUCCEEDED(stmt->GetTypeOfIndex(0, &keyType)) &&
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad SQLITE type!");
}
#endif
rv = stmt->GetString(0, *value);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
return OK;
}
PRUint16
GetAllObjectsHelper::OnSuccess(nsIDOMEventTarget* aTarget)
{
nsRefPtr<GetAllSuccessEvent> event(new GetAllSuccessEvent(mValues));
NS_ASSERTION(mValues.IsEmpty(), "Should have swapped!");
nsresult rv = event->Init(mRequest, mTransaction);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
PRBool dummy;
aTarget->DispatchEvent(static_cast<nsDOMEvent*>(event), &dummy);
return OK;
}
PRUint16
OpenCursorHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
if (!mData.SetCapacity(50)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
nsCString table;
nsCString keyColumn;
if (mAutoIncrement) {
keyColumn.AssignLiteral("ai_object_data_id");
if (mUnique) {
table.AssignLiteral("ai_unique_index_data");
}
else {
table.AssignLiteral("ai_index_data");
}
}
else {
keyColumn.AssignLiteral("object_data_key");
if (mUnique) {
table.AssignLiteral("unique_index_data");
}
else {
table.AssignLiteral("index_data");
}
}
NS_NAMED_LITERAL_CSTRING(indexId, "index_id");
NS_NAMED_LITERAL_CSTRING(leftKeyName, "left_key");
NS_NAMED_LITERAL_CSTRING(rightKeyName, "right_key");
nsCAutoString keyRangeClause;
if (!mLeftKey.IsUnset()) {
keyRangeClause = NS_LITERAL_CSTRING(" AND value");
if (mKeyRangeFlags & nsIIDBKeyRange::LEFT_OPEN) {
keyRangeClause.AppendLiteral(" > :");
}
else {
NS_ASSERTION(mKeyRangeFlags & nsIIDBKeyRange::LEFT_BOUND, "Bad flags!");
keyRangeClause.AppendLiteral(" >= :");
}
keyRangeClause.Append(leftKeyName);
}
if (!mRightKey.IsUnset()) {
keyRangeClause.AppendLiteral(" AND value");
if (mKeyRangeFlags & nsIIDBKeyRange::RIGHT_OPEN) {
keyRangeClause.AppendLiteral(" < :");
}
else {
NS_ASSERTION(mKeyRangeFlags & nsIIDBKeyRange::RIGHT_BOUND, "Bad flags!");
keyRangeClause.AppendLiteral(" <= :");
}
keyRangeClause.Append(rightKeyName);
}
nsCString groupClause;
switch (mDirection) {
case nsIIDBCursor::NEXT:
case nsIIDBCursor::PREV:
break;
case nsIIDBCursor::NEXT_NO_DUPLICATE:
case nsIIDBCursor::PREV_NO_DUPLICATE:
groupClause = NS_LITERAL_CSTRING(" GROUP BY value");
break;
default:
NS_NOTREACHED("Unknown direction!");
}
nsCString directionClause;
switch (mDirection) {
case nsIIDBCursor::NEXT:
case nsIIDBCursor::NEXT_NO_DUPLICATE:
directionClause = NS_LITERAL_CSTRING("DESC");
break;
case nsIIDBCursor::PREV:
case nsIIDBCursor::PREV_NO_DUPLICATE:
directionClause = NS_LITERAL_CSTRING("ASC");
break;
default:
NS_NOTREACHED("Unknown direction!");
}
nsCString query = NS_LITERAL_CSTRING("SELECT value, ") + keyColumn +
NS_LITERAL_CSTRING(" FROM ") + table +
NS_LITERAL_CSTRING(" WHERE index_id = :") + indexId +
keyRangeClause + groupClause +
NS_LITERAL_CSTRING(" ORDER BY value ") + directionClause;
nsCOMPtr<mozIStorageStatement> stmt = mTransaction->GetCachedStatement(query);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(indexId, mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (!mLeftKey.IsUnset()) {
if (mLeftKey.IsString()) {
rv = stmt->BindStringByName(leftKeyName, mLeftKey.StringValue());
}
else if (mLeftKey.IsInt()) {
rv = stmt->BindInt64ByName(leftKeyName, mLeftKey.IntValue());
}
else {
NS_NOTREACHED("Bad key!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
if (!mRightKey.IsUnset()) {
if (mRightKey.IsString()) {
rv = stmt->BindStringByName(rightKeyName, mRightKey.StringValue());
}
else if (mRightKey.IsInt()) {
rv = stmt->BindInt64ByName(rightKeyName, mRightKey.IntValue());
}
else {
NS_NOTREACHED("Bad key!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
PRBool hasResult;
while (NS_SUCCEEDED((rv = stmt->ExecuteStep(&hasResult))) && hasResult) {
if (mData.Capacity() == mData.Length()) {
if (!mData.SetCapacity(mData.Capacity() * 2)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
}
KeyKeyPair* pair = mData.AppendElement();
NS_ASSERTION(pair, "Shouldn't fail if SetCapacity succeeded!");
PRInt32 keyType;
rv = stmt->GetTypeOfIndex(0, &keyType);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_ASSERTION(keyType == mozIStorageStatement::VALUE_TYPE_INTEGER ||
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad key type!");
if (keyType == mozIStorageStatement::VALUE_TYPE_INTEGER) {
pair->key = stmt->AsInt64(0);
}
else if (keyType == mozIStorageStatement::VALUE_TYPE_TEXT) {
rv = stmt->GetString(0, pair->key.ToString());
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
NS_NOTREACHED("Bad SQLite type!");
}
rv = stmt->GetTypeOfIndex(1, &keyType);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_ASSERTION(keyType == mozIStorageStatement::VALUE_TYPE_INTEGER ||
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad key type!");
if (keyType == mozIStorageStatement::VALUE_TYPE_INTEGER) {
pair->value = stmt->AsInt64(1);
}
else if (keyType == mozIStorageStatement::VALUE_TYPE_TEXT) {
rv = stmt->GetString(1, pair->value.ToString());
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
NS_NOTREACHED("Bad SQLite type!");
}
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
return OK;
}
PRUint16
OpenCursorHelper::GetSuccessResult(nsIWritableVariant* aResult)
{
if (mData.IsEmpty()) {
aResult->SetAsEmpty();
return OK;
}
nsRefPtr<IDBCursor> cursor =
IDBCursor::Create(mRequest, mTransaction, mIndex, mDirection, mData);
NS_ENSURE_TRUE(cursor, nsIIDBDatabaseException::UNKNOWN_ERR);
aResult->SetAsISupports(static_cast<nsPIDOMEventTarget*>(cursor));
return OK;
}
PRUint16
OpenObjectCursorHelper::DoDatabaseWork(mozIStorageConnection* aConnection)
{
NS_ASSERTION(aConnection, "Passed a null connection!");
if (!mData.SetCapacity(50)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
nsCString indexTable;
nsCString objectTable;
nsCString objectDataId;
if (mAutoIncrement) {
objectTable.AssignLiteral("ai_object_data");
objectDataId.AssignLiteral("ai_object_data_id");
if (mUnique) {
indexTable.AssignLiteral("ai_unique_index_data");
}
else {
indexTable.AssignLiteral("ai_index_data");
}
}
else {
objectTable.AssignLiteral("object_data");
objectDataId.AssignLiteral("object_data_id");
if (mUnique) {
indexTable.AssignLiteral("unique_index_data");
}
else {
indexTable.AssignLiteral("index_data");
}
}
NS_NAMED_LITERAL_CSTRING(indexId, "index_id");
NS_NAMED_LITERAL_CSTRING(leftKeyName, "left_key");
NS_NAMED_LITERAL_CSTRING(rightKeyName, "right_key");
NS_NAMED_LITERAL_CSTRING(value, "value");
NS_NAMED_LITERAL_CSTRING(data, "data");
nsCAutoString keyRangeClause;
if (!mLeftKey.IsUnset()) {
keyRangeClause = NS_LITERAL_CSTRING(" AND value");
if (mKeyRangeFlags & nsIIDBKeyRange::LEFT_OPEN) {
keyRangeClause.AppendLiteral(" > :");
}
else {
NS_ASSERTION(mKeyRangeFlags & nsIIDBKeyRange::LEFT_BOUND, "Bad flags!");
keyRangeClause.AppendLiteral(" >= :");
}
keyRangeClause.Append(leftKeyName);
}
if (!mRightKey.IsUnset()) {
keyRangeClause += NS_LITERAL_CSTRING(" AND value");
if (mKeyRangeFlags & nsIIDBKeyRange::RIGHT_OPEN) {
keyRangeClause.AppendLiteral(" < :");
}
else {
NS_ASSERTION(mKeyRangeFlags & nsIIDBKeyRange::RIGHT_BOUND, "Bad flags!");
keyRangeClause.AppendLiteral(" <= :");
}
keyRangeClause.Append(rightKeyName);
}
nsCString groupClause;
switch (mDirection) {
case nsIIDBCursor::NEXT:
case nsIIDBCursor::PREV:
break;
case nsIIDBCursor::NEXT_NO_DUPLICATE:
case nsIIDBCursor::PREV_NO_DUPLICATE:
groupClause = NS_LITERAL_CSTRING(" GROUP BY ") + indexTable +
NS_LITERAL_CSTRING(".") + value;
break;
default:
NS_NOTREACHED("Unknown direction!");
}
nsCString directionClause;
switch (mDirection) {
case nsIIDBCursor::NEXT:
case nsIIDBCursor::NEXT_NO_DUPLICATE:
directionClause = NS_LITERAL_CSTRING(" DESC");
break;
case nsIIDBCursor::PREV:
case nsIIDBCursor::PREV_NO_DUPLICATE:
directionClause = NS_LITERAL_CSTRING(" ASC");
break;
default:
NS_NOTREACHED("Unknown direction!");
}
nsCString query = NS_LITERAL_CSTRING("SELECT ") + indexTable +
NS_LITERAL_CSTRING(".") + value +
NS_LITERAL_CSTRING(", ") + objectTable +
NS_LITERAL_CSTRING(".") + data +
NS_LITERAL_CSTRING(" FROM ") + objectTable +
NS_LITERAL_CSTRING(" INNER JOIN ") + indexTable +
NS_LITERAL_CSTRING(" ON ") + indexTable +
NS_LITERAL_CSTRING(".") + objectDataId +
NS_LITERAL_CSTRING(" = ") + objectTable +
NS_LITERAL_CSTRING(".id WHERE ") + indexId +
NS_LITERAL_CSTRING(" = :") + indexId + keyRangeClause +
groupClause + NS_LITERAL_CSTRING(" ORDER BY ") +
indexTable + NS_LITERAL_CSTRING(".") + value +
directionClause;
nsCOMPtr<mozIStorageStatement> stmt = mTransaction->GetCachedStatement(query);
NS_ENSURE_TRUE(stmt, nsIIDBDatabaseException::UNKNOWN_ERR);
mozStorageStatementScoper scoper(stmt);
nsresult rv = stmt->BindInt64ByName(indexId, mId);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
if (!mLeftKey.IsUnset()) {
if (mLeftKey.IsString()) {
rv = stmt->BindStringByName(leftKeyName, mLeftKey.StringValue());
}
else if (mLeftKey.IsInt()) {
rv = stmt->BindInt64ByName(leftKeyName, mLeftKey.IntValue());
}
else {
NS_NOTREACHED("Bad key!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
if (!mRightKey.IsUnset()) {
if (mRightKey.IsString()) {
rv = stmt->BindStringByName(rightKeyName, mRightKey.StringValue());
}
else if (mRightKey.IsInt()) {
rv = stmt->BindInt64ByName(rightKeyName, mRightKey.IntValue());
}
else {
NS_NOTREACHED("Bad key!");
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
PRBool hasResult;
while (NS_SUCCEEDED((rv = stmt->ExecuteStep(&hasResult))) && hasResult) {
if (mData.Capacity() == mData.Length()) {
if (!mData.SetCapacity(mData.Capacity() * 2)) {
NS_ERROR("Out of memory!");
return nsIIDBDatabaseException::UNKNOWN_ERR;
}
}
KeyValuePair* pair = mData.AppendElement();
NS_ASSERTION(pair, "Shouldn't fail if SetCapacity succeeded!");
PRInt32 keyType;
rv = stmt->GetTypeOfIndex(0, &keyType);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
NS_ASSERTION(keyType == mozIStorageStatement::VALUE_TYPE_INTEGER ||
keyType == mozIStorageStatement::VALUE_TYPE_TEXT,
"Bad key type!");
if (keyType == mozIStorageStatement::VALUE_TYPE_INTEGER) {
pair->key = stmt->AsInt64(0);
}
else if (keyType == mozIStorageStatement::VALUE_TYPE_TEXT) {
rv = stmt->GetString(0, pair->key.ToString());
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
else {
NS_NOTREACHED("Bad SQLite type!");
}
rv = stmt->GetString(1, pair->value);
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
}
NS_ENSURE_SUCCESS(rv, nsIIDBDatabaseException::UNKNOWN_ERR);
return OK;
}
PRUint16
OpenObjectCursorHelper::GetSuccessResult(nsIWritableVariant* aResult)
{
if (mData.IsEmpty()) {
aResult->SetAsEmpty();
return OK;
}
nsRefPtr<IDBCursor> cursor =
IDBCursor::Create(mRequest, mTransaction, mIndex, mDirection, mData);
NS_ENSURE_TRUE(cursor, nsIIDBDatabaseException::UNKNOWN_ERR);
aResult->SetAsISupports(static_cast<nsPIDOMEventTarget*>(cursor));
return OK;
}
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