* HIGHLY EXPERIMENTAL - USE AT OWN RISK *

Database Layer:
- Implement connection pooling: Instead of 1 delay thread per database, you can configure between 1 and 32 worker threads that have a seperate thread in the core and have a seperate connection to the MySQL server (based on raczman/Albator´s database layer for Trinitycore3)
- Implement a configurable thread bundle for synchroneous requests from seperate core threads (see worldserver.conf.dist for more info)
- Every mapupdate thread now has its seperate MySQL connection to the world and characters database
- Drop inconsistent PExecuteLog function - query logging will be implemented CONSISTENTLY later
- Drop current prepared statement interface - this will be done *properly* later
- You´ll need to update your worldserver.conf and authserver.conf
- You´re recommended to make a backup of your databases before using this.
* HIGHLY EXPERIMENTAL - USE AT OWN RISK *
* HIGHLY EXPERIMENTAL - USE AT OWN RISK *
etc.

--HG--
branch : trunk

src/server/shared/Database/SQLOperation.cpp

@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2008-2010 Trinity <http://www.trinitycore.org/>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "SQLOperation.h"
+#include "MySQLConnection.h"
+
+/*! Basic, ad-hoc queries. */
+BasicStatementTask::BasicStatementTask(const char* sql)
+{
+    m_sql = strdup(sql);
+}
+
+BasicStatementTask::~BasicStatementTask()
+{
+    free((void*)m_sql);
+}
+
+bool BasicStatementTask::Execute()
+{
+    return m_conn->Execute(m_sql);
+}
+
+/*! Transactions. */
+TransactionTask::TransactionTask()
+{
+}
+
+TransactionTask::~TransactionTask()
+{
+   
+}
+
+void TransactionTask::ForcefulDelete()
+{
+    while (!m_queries.empty())
+    {
+        free((void*)const_cast<char*>(m_queries.front()));
+        m_queries.pop();
+    }
+}
+
+bool TransactionTask::Execute()
+{
+    if (m_queries.empty())
+        return false;
+
+    const char* sql;
+
+    m_conn->BeginTransaction();
+    while (!m_queries.empty())
+    {
+        sql = m_queries.front();
+        if (!m_conn->Execute(sql))
+        {
+            free((void*)const_cast<char*>(sql));
+            m_queries.pop();
+            m_conn->RollbackTransaction();
+            ForcefulDelete();
+            return false;
+        }
+
+        free((void*)const_cast<char*>(sql));
+        m_queries.pop();
+    }
+
+    m_conn->CommitTransaction();
+    return true;
+}
+
+/*! Callback statements/holders */
+void SQLResultQueue::Update()
+{
+    /// execute the callbacks waiting in the synchronization queue
+    Trinity::IQueryCallback* callback;
+    while (next(callback))
+    {
+        callback->Execute();
+        delete callback;
+    }
+}
+
+bool SQLQueryHolder::SetQuery(size_t index, const char *sql)
+{
+    if (m_queries.size() <= index)
+    {
+        sLog.outError("Query index (%u) out of range (size: %u) for query: %s", index, (uint32)m_queries.size(), sql);
+        return false;
+    }
+
+    if (m_queries[index].first != NULL)
+    {
+        sLog.outError("Attempt assign query to holder index (%u) where other query stored (Old: [%s] New: [%s])",
+            index, m_queries[index].first, sql);
+        return false;
+    }
+
+    /// not executed yet, just stored (it's not called a holder for nothing)
+    m_queries[index] = SQLResultPair(strdup(sql), QueryResult_AutoPtr(NULL));
+    return true;
+}
+
+bool SQLQueryHolder::SetPQuery(size_t index, const char *format, ...)
+{
+    if (!format)
+    {
+        sLog.outError("Query (index: %u) is empty.",index);
+        return false;
+    }
+
+    va_list ap;
+    char szQuery [MAX_QUERY_LEN];
+    va_start(ap, format);
+    int res = vsnprintf(szQuery, MAX_QUERY_LEN, format, ap);
+    va_end(ap);
+
+    if (res==-1)
+    {
+        sLog.outError("SQL Query truncated (and not execute) for format: %s",format);
+        return false;
+    }
+
+    return SetQuery(index, szQuery);
+}
+
+QueryResult_AutoPtr SQLQueryHolder::GetResult(size_t index)
+{
+    if (index < m_queries.size())
+    {
+        /// the query strings are freed on the first GetResult or in the destructor
+        if (m_queries[index].first != NULL)
+        {
+            free((void*)(const_cast<char*>(m_queries[index].first)));
+            m_queries[index].first = NULL;
+        }
+        /// when you get a result aways remember to delete it!
+        return m_queries[index].second;
+    }
+    else
+        return QueryResult_AutoPtr(NULL);
+}
+
+void SQLQueryHolder::SetResult(size_t index, QueryResult_AutoPtr result)
+{
+    /// store the result in the holder
+    if (index < m_queries.size())
+        m_queries[index].second = result;
+}
+
+SQLQueryHolder::~SQLQueryHolder()
+{
+    for (size_t i = 0; i < m_queries.size(); i++)
+    {
+        /// if the result was never used, free the resources
+        /// results used already (getresult called) are expected to be deleted
+        if (m_queries[i].first != NULL)
+            free((void*)(const_cast<char*>(m_queries[i].first)));
+    }
+}
+
+void SQLQueryHolder::SetSize(size_t size)
+{
+    /// to optimize push_back, reserve the number of queries about to be executed
+    m_queries.resize(size);
+}
+
+bool SQLQueryHolderTask::Execute()
+{
+    if (!m_holder || !m_callback || !m_queue)
+        return false;
+
+    /// we can do this, we are friends
+    std::vector<SQLQueryHolder::SQLResultPair> &queries = m_holder->m_queries;
+
+    for (size_t i = 0; i < queries.size(); i++)
+    {
+        /// execute all queries in the holder and pass the results
+        char const *sql = queries[i].first;
+        if (sql)
+            m_holder->SetResult(i, m_conn->Query(sql));
+    }
+
+    /// sync with the caller thread
+    m_queue->add(m_callback);
+    return true;
+}
+
+bool SQLQueryTask::Execute()
+{
+    if (!m_callback || !m_queue)
+        return false;
+
+    /// execute the query and store the result in the callback
+    m_callback->SetResult(m_conn->Query(m_sql));
+    /// add the callback to the sql result queue of the thread it originated from
+    m_queue->add(m_callback);
+    return true;
+}