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/*
* Copyright (C) 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SQLStatement.h"
#if ENABLE(DATABASE)
#include "Database.h"
#include "Logging.h"
#include "SQLError.h"
#include "SQLiteDatabase.h"
#include "SQLiteStatement.h"
#include "SQLStatementCallback.h"
#include "SQLStatementErrorCallback.h"
#include "SQLTransaction.h"
#include "SQLValue.h"
namespace WebCore {
PassRefPtr<SQLStatement> SQLStatement::create(const String& statement, const Vector<SQLValue>& arguments, PassRefPtr<SQLStatementCallback> callback, PassRefPtr<SQLStatementErrorCallback> errorCallback, bool readOnly)
{
return adoptRef(new SQLStatement(statement, arguments, callback, errorCallback, readOnly));
}
SQLStatement::SQLStatement(const String& statement, const Vector<SQLValue>& arguments, PassRefPtr<SQLStatementCallback> callback, PassRefPtr<SQLStatementErrorCallback> errorCallback, bool readOnly)
: m_statement(statement.crossThreadString())
, m_arguments(arguments)
, m_statementCallback(callback)
, m_statementErrorCallback(errorCallback)
, m_readOnly(readOnly)
{
}
bool SQLStatement::execute(Database* db)
{
ASSERT(!m_resultSet);
// If we're re-running this statement after a quota violation, we need to clear that error now
clearFailureDueToQuota();
// This transaction might have been marked bad while it was being set up on the main thread,
// so if there is still an error, return false.
if (m_error)
return false;
if (m_readOnly)
db->setAuthorizerReadOnly();
SQLiteDatabase* database = &db->sqliteDatabase();
SQLiteStatement statement(*database, m_statement);
int result = statement.prepare();
if (result != SQLResultOk) {
LOG(StorageAPI, "Unable to verify correctness of statement %s - error %i (%s)", m_statement.ascii().data(), result, database->lastErrorMsg());
m_error = SQLError::create(SQLError::SYNTAX_ERR, database->lastErrorMsg());
return false;
}
// FIXME: If the statement uses the ?### syntax supported by sqlite, the bind parameter count is very likely off from the number of question marks.
// If this is the case, they might be trying to do something fishy or malicious
if (statement.bindParameterCount() != m_arguments.size()) {
LOG(StorageAPI, "Bind parameter count doesn't match number of question marks");
m_error = SQLError::create(SQLError::SYNTAX_ERR, "number of '?'s in statement string does not match argument count");
return false;
}
for (unsigned i = 0; i < m_arguments.size(); ++i) {
result = statement.bindValue(i + 1, m_arguments[i]);
if (result == SQLResultFull) {
setFailureDueToQuota();
return false;
}
if (result != SQLResultOk) {
LOG(StorageAPI, "Failed to bind value index %i to statement for query '%s'", i + 1, m_statement.ascii().data());
m_error = SQLError::create(SQLError::DATABASE_ERR, database->lastErrorMsg());
return false;
}
}
RefPtr<SQLResultSet> resultSet = SQLResultSet::create();
// Step so we can fetch the column names.
result = statement.step();
if (result == SQLResultRow) {
int columnCount = statement.columnCount();
SQLResultSetRowList* rows = resultSet->rows();
for (int i = 0; i < columnCount; i++)
rows->addColumn(statement.getColumnName(i));
do {
for (int i = 0; i < columnCount; i++)
rows->addResult(statement.getColumnValue(i));
result = statement.step();
} while (result == SQLResultRow);
if (result != SQLResultDone) {
m_error = SQLError::create(SQLError::DATABASE_ERR, database->lastErrorMsg());
return false;
}
} else if (result == SQLResultDone) {
// Didn't find anything, or was an insert
if (db->lastActionWasInsert())
resultSet->setInsertId(database->lastInsertRowID());
} else if (result == SQLResultFull) {
// Return the Quota error - the delegate will be asked for more space and this statement might be re-run
setFailureDueToQuota();
return false;
} else {
m_error = SQLError::create(SQLError::DATABASE_ERR, database->lastErrorMsg());
return false;
}
// FIXME: If the spec allows triggers, and we want to be "accurate" in a different way, we'd use
// sqlite3_total_changes() here instead of sqlite3_changed, because that includes rows modified from within a trigger
// For now, this seems sufficient
resultSet->setRowsAffected(database->lastChanges());
m_resultSet = resultSet;
return true;
}
void SQLStatement::setDatabaseDeletedError()
{
ASSERT(!m_error && !m_resultSet);
m_error = SQLError::create(SQLError::UNKNOWN_ERR, "unable to execute statement, because the user deleted the database");
}
void SQLStatement::setVersionMismatchedError()
{
ASSERT(!m_error && !m_resultSet);
m_error = SQLError::create(SQLError::VERSION_ERR, "current version of the database and `oldVersion` argument do not match");
}
bool SQLStatement::performCallback(SQLTransaction* transaction)
{
ASSERT(transaction);
bool callbackError = false;
// Call the appropriate statement callback and track if it resulted in an error,
// because then we need to jump to the transaction error callback.
if (m_error) {
ASSERT(m_statementErrorCallback);
callbackError = m_statementErrorCallback->handleEvent(transaction->database()->scriptExecutionContext(), transaction, m_error.get());
} else if (m_statementCallback)
callbackError = !m_statementCallback->handleEvent(transaction->database()->scriptExecutionContext(), transaction, m_resultSet.get());
// Now release our callbacks, to break reference cycles.
m_statementCallback = 0;
m_statementErrorCallback = 0;
return callbackError;
}
void SQLStatement::setFailureDueToQuota()
{
ASSERT(!m_error && !m_resultSet);
m_error = SQLError::create(SQLError::QUOTA_ERR, "there was not enough remaining storage space, or the storage quota was reached and the user declined to allow more space");
}
void SQLStatement::clearFailureDueToQuota()
{
if (lastExecutionFailedDueToQuota())
m_error = 0;
}
bool SQLStatement::lastExecutionFailedDueToQuota() const
{
return m_error && m_error->code() == SQLError::QUOTA_ERR;
}
} // namespace WebCore
#endif // ENABLE(DATABASE)
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