azerothcore-wotlk-pbot/src/common/Database/Transaction.cpp

/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#include "DatabaseEnv.h"
#include "Transaction.h"

//- Append a raw ad-hoc query to the transaction
void Transaction::Append(const char* sql)
{
    SQLElementData data;
    data.type = SQL_ELEMENT_RAW;
    data.element.query = strdup(sql);
    m_queries.push_back(data);
}

void Transaction::PAppend(const char* sql, ...)
{
    va_list ap;
    char szQuery [MAX_QUERY_LEN];
    va_start(ap, sql);
    vsnprintf(szQuery, MAX_QUERY_LEN, sql, ap);
    va_end(ap);

    Append(szQuery);
}

//- Append a prepared statement to the transaction
void Transaction::Append(PreparedStatement* stmt)
{
    SQLElementData data;
    data.type = SQL_ELEMENT_PREPARED;
    data.element.stmt = stmt;
    m_queries.push_back(data);
}

void Transaction::Cleanup()
{
    // This might be called by explicit calls to Cleanup or by the auto-destructor
    if (_cleanedUp)
        return;

    while (!m_queries.empty())
    {
        SQLElementData const& data = m_queries.front();
        switch (data.type)
        {
            case SQL_ELEMENT_PREPARED:
                delete data.element.stmt;
                break;
            case SQL_ELEMENT_RAW:
                free((void*)(data.element.query));
                break;
        }

        m_queries.pop_front();
    }

    _cleanedUp = true;
}

bool TransactionTask::Execute()
{
    if (m_conn->ExecuteTransaction(m_trans))
        return true;

    if (m_conn->GetLastError() == 1213)
    {
        uint8 loopBreaker = 5;  // Handle MySQL Errno 1213 without extending deadlock to the core itself
        for (uint8 i = 0; i < loopBreaker; ++i)
            if (m_conn->ExecuteTransaction(m_trans))
                return true;
    }

    // Clean up now.
    m_trans->Cleanup();

    return false;
}