feat(Cmake/Database): separate database lib from common (#5334)

* feat(Core/Database): separate databse lib from common

* 1

src/server/database/Database/QueryHolder.cpp

@@ -0,0 +1,197 @@
+/*
+ * 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 "MySQLConnection.h"
+#include "QueryHolder.h"
+#include "PreparedStatement.h"
+#include "Log.h"
+
+bool SQLQueryHolder::SetQuery(size_t index, const char* sql)
+{
+    if (m_queries.size() <= index)
+    {
+        LOG_ERROR("server", "Query index (%u) out of range (size: %u) for query: %s", uint32(index), (uint32)m_queries.size(), sql);
+        return false;
+    }
+
+    /// not executed yet, just stored (it's not called a holder for nothing)
+    SQLElementData element;
+    element.type = SQL_ELEMENT_RAW;
+    element.element.query = strdup(sql);
+
+    SQLResultSetUnion result;
+    result.qresult = nullptr;
+
+    m_queries[index] = SQLResultPair(element, result);
+    return true;
+}
+
+bool SQLQueryHolder::SetPQuery(size_t index, const char* format, ...)
+{
+    if (!format)
+    {
+        LOG_ERROR("server", "Query (index: %u) is empty.", uint32(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)
+    {
+        LOG_ERROR("server", "SQL Query truncated (and not execute) for format: %s", format);
+        return false;
+    }
+
+    return SetQuery(index, szQuery);
+}
+
+bool SQLQueryHolder::SetPreparedQuery(size_t index, PreparedStatement* stmt)
+{
+    if (m_queries.size() <= index)
+    {
+        LOG_ERROR("server", "Query index (%u) out of range (size: %u) for prepared statement", uint32(index), (uint32)m_queries.size());
+        return false;
+    }
+
+    /// not executed yet, just stored (it's not called a holder for nothing)
+    SQLElementData element;
+    element.type = SQL_ELEMENT_PREPARED;
+    element.element.stmt = stmt;
+
+    SQLResultSetUnion result;
+    result.presult = nullptr;
+
+    m_queries[index] = SQLResultPair(element, result);
+    return true;
+}
+
+QueryResult SQLQueryHolder::GetResult(size_t index)
+{
+    // Don't call to this function if the index is of an ad-hoc statement
+    if (index < m_queries.size())
+    {
+        ResultSet* result = m_queries[index].second.qresult;
+        if (!result || !result->GetRowCount())
+            return QueryResult(nullptr);
+
+        result->NextRow();
+        return QueryResult(result);
+    }
+    else
+        return QueryResult(nullptr);
+}
+
+PreparedQueryResult SQLQueryHolder::GetPreparedResult(size_t index)
+{
+    // Don't call to this function if the index is of a prepared statement
+    if (index < m_queries.size())
+    {
+        PreparedResultSet* result = m_queries[index].second.presult;
+        if (!result || !result->GetRowCount())
+            return PreparedQueryResult(nullptr);
+
+        return PreparedQueryResult(result);
+    }
+    else
+        return PreparedQueryResult(nullptr);
+}
+
+void SQLQueryHolder::SetResult(size_t index, ResultSet* result)
+{
+    if (result && !result->GetRowCount())
+    {
+        delete result;
+        result = nullptr;
+    }
+
+    /// store the result in the holder
+    if (index < m_queries.size())
+        m_queries[index].second.qresult = result;
+}
+
+void SQLQueryHolder::SetPreparedResult(size_t index, PreparedResultSet* result)
+{
+    if (result && !result->GetRowCount())
+    {
+        delete result;
+        result = nullptr;
+    }
+
+    /// store the result in the holder
+    if (index < m_queries.size())
+        m_queries[index].second.presult = 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 (SQLElementData* data = &m_queries[i].first)
+        {
+            switch (data->type)
+            {
+                case SQL_ELEMENT_RAW:
+                    free((void*)(const_cast<char*>(data->element.query)));
+                    break;
+                case SQL_ELEMENT_PREPARED:
+                    delete data->element.stmt;
+                    break;
+            }
+        }
+    }
+}
+
+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()
+{
+    //the result can't be ready as we are processing it right now
+    ASSERT(!m_result.ready());
+
+    if (!m_holder)
+        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
+        if (SQLElementData* data = &queries[i].first)
+        {
+            switch (data->type)
+            {
+                case SQL_ELEMENT_RAW:
+                {
+                    char const* sql = data->element.query;
+                    if (sql)
+                        m_holder->SetResult(i, m_conn->Query(sql));
+                    break;
+                }
+                case SQL_ELEMENT_PREPARED:
+                {
+                    PreparedStatement* stmt = data->element.stmt;
+                    if (stmt)
+                        m_holder->SetPreparedResult(i, m_conn->Query(stmt));
+                    break;
+                }
+            }
+        }
+    }
+
+    m_result.set(m_holder);
+    return true;
+}