зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.2 KiB
C++
129 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 sts=2 et
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozStorageStatementData_h
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#define mozStorageStatementData_h
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#include "sqlite3.h"
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#include "nsAutoPtr.h"
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#include "nsTArray.h"
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#include "nsIEventTarget.h"
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#include "MainThreadUtils.h"
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#include "mozStorageBindingParamsArray.h"
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#include "mozIStorageBaseStatement.h"
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#include "mozStorageConnection.h"
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#include "StorageBaseStatementInternal.h"
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struct sqlite3_stmt;
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namespace mozilla {
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namespace storage {
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class StatementData {
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public:
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StatementData(sqlite3_stmt *aStatement,
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already_AddRefed<BindingParamsArray> aParamsArray,
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StorageBaseStatementInternal *aStatementOwner)
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: mStatement(aStatement),
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mParamsArray(aParamsArray),
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mStatementOwner(aStatementOwner) {
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MOZ_ASSERT(mStatementOwner, "Must have a statement owner!");
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}
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StatementData(const StatementData &aSource)
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: mStatement(aSource.mStatement),
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mParamsArray(aSource.mParamsArray),
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mStatementOwner(aSource.mStatementOwner) {
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MOZ_ASSERT(mStatementOwner, "Must have a statement owner!");
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}
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StatementData() : mStatement(nullptr) {}
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~StatementData() {
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// We need to ensure that mParamsArray is released on the main thread,
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// as the binding arguments may be XPConnect values, which are safe
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// to release only on the main thread.
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NS_ReleaseOnMainThreadSystemGroup("StatementData::mParamsArray",
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mParamsArray.forget());
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}
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/**
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* Return the sqlite statement, fetching it from the storage statement. In
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* the case of AsyncStatements this may actually create the statement
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*/
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inline int getSqliteStatement(sqlite3_stmt **_stmt) {
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if (!mStatement) {
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int rc = mStatementOwner->getAsyncStatement(&mStatement);
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NS_ENSURE_TRUE(rc == SQLITE_OK, rc);
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}
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*_stmt = mStatement;
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return SQLITE_OK;
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}
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operator BindingParamsArray *() const { return mParamsArray; }
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/**
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* NULLs out our sqlite3_stmt (it is held by the owner) after reseting it and
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* clear all bindings to it. This is expected to occur on the async thread.
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*/
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inline void reset() {
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MOZ_ASSERT(mStatementOwner, "Must have a statement owner!");
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// In the AsyncStatement case we may never have populated mStatement if the
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// AsyncExecuteStatements got canceled or a failure occurred in constructing
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// the statement.
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if (mStatement) {
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(void)::sqlite3_reset(mStatement);
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(void)::sqlite3_clear_bindings(mStatement);
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mStatement = nullptr;
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}
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}
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/**
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* Indicates if this statement has parameters to be bound before it is
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* executed.
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*
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* @return true if the statement has parameters to bind against, false
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* otherwise.
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*/
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inline bool hasParametersToBeBound() const { return !!mParamsArray; }
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/**
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* Indicates the number of implicit statements generated by this statement
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* requiring a transaction for execution. For example a single statement
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* with N BindingParams will execute N implicit staments.
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*
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* @return number of statements requiring a transaction for execution.
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*
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* @note In the case of AsyncStatements this may actually create the
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* statement.
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*/
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inline uint32_t needsTransaction() {
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MOZ_ASSERT(!NS_IsMainThread());
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// Be sure to use the getSqliteStatement helper, since sqlite3_stmt_readonly
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// can only analyze prepared statements and AsyncStatements are prepared
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// lazily.
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sqlite3_stmt *stmt;
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int rc = getSqliteStatement(&stmt);
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if (SQLITE_OK != rc || ::sqlite3_stmt_readonly(stmt)) {
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return 0;
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}
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return mParamsArray ? mParamsArray->length() : 1;
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}
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private:
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sqlite3_stmt *mStatement;
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RefPtr<BindingParamsArray> mParamsArray;
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/**
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* We hold onto a reference of the statement's owner so it doesn't get
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* destroyed out from under us.
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*/
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nsCOMPtr<StorageBaseStatementInternal> mStatementOwner;
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};
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} // namespace storage
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} // namespace mozilla
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#endif // mozStorageStatementData_h
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