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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation; either version 3 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 Affero General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "MySQLPreparedStatement.h"
#include "Errors.h"
#include "Log.h"
#include "MySQLHacks.h"
#include "PreparedStatement.h"
template<typename T>
struct MySQLType { };
template<> struct MySQLType<uint8> : std::integral_constant<enum_field_types, MYSQL_TYPE_TINY> { };
template<> struct MySQLType<uint16> : std::integral_constant<enum_field_types, MYSQL_TYPE_SHORT> { };
template<> struct MySQLType<uint32> : std::integral_constant<enum_field_types, MYSQL_TYPE_LONG> { };
template<> struct MySQLType<uint64> : std::integral_constant<enum_field_types, MYSQL_TYPE_LONGLONG> { };
template<> struct MySQLType<int8> : std::integral_constant<enum_field_types, MYSQL_TYPE_TINY> { };
template<> struct MySQLType<int16> : std::integral_constant<enum_field_types, MYSQL_TYPE_SHORT> { };
template<> struct MySQLType<int32> : std::integral_constant<enum_field_types, MYSQL_TYPE_LONG> { };
template<> struct MySQLType<int64> : std::integral_constant<enum_field_types, MYSQL_TYPE_LONGLONG> { };
template<> struct MySQLType<float> : std::integral_constant<enum_field_types, MYSQL_TYPE_FLOAT> { };
template<> struct MySQLType<double> : std::integral_constant<enum_field_types, MYSQL_TYPE_DOUBLE> { };
MySQLPreparedStatement::MySQLPreparedStatement(MySQLStmt* stmt, std::string queryString) :
m_stmt(nullptr), m_Mstmt(stmt), m_bind(nullptr), m_queryString(std::move(queryString))
{
/// Initialize variable parameters
m_paramCount = mysql_stmt_param_count(stmt);
m_paramsSet.assign(m_paramCount, false);
m_bind = new MySQLBind[m_paramCount];
memset(m_bind, 0, sizeof(MySQLBind) * m_paramCount);
/// "If set to 1, causes mysql_stmt_store_result() to update the metadata MYSQL_FIELD->max_length value."
MySQLBool bool_tmp = MySQLBool(1);
mysql_stmt_attr_set(stmt, STMT_ATTR_UPDATE_MAX_LENGTH, &bool_tmp);
}
MySQLPreparedStatement::~MySQLPreparedStatement()
{
ClearParameters();
if (m_Mstmt->bind_result_done)
{
delete[] m_Mstmt->bind->length;
delete[] m_Mstmt->bind->is_null;
}
mysql_stmt_close(m_Mstmt);
delete[] m_bind;
}
void MySQLPreparedStatement::BindParameters(PreparedStatementBase* stmt)
{
m_stmt = stmt; // Cross reference them for debug output
uint8 pos = 0;
for (PreparedStatementData const& data : stmt->GetParameters())
{
std::visit([&](auto&& param)
{
SetParameter(pos, param);
}, data.data);
++pos;
}
#ifdef _DEBUG
if (pos < m_paramCount)
LOG_WARN("sql.sql", "[WARNING]: BindParameters() for statement %u did not bind all allocated parameters", stmt->GetIndex());
#endif
}
void MySQLPreparedStatement::ClearParameters()
{
for (uint32 i=0; i < m_paramCount; ++i)
{
delete m_bind[i].length;
m_bind[i].length = nullptr;
delete[] (char*) m_bind[i].buffer;
m_bind[i].buffer = nullptr;
m_paramsSet[i] = false;
}
}
static bool ParamenterIndexAssertFail(uint32 stmtIndex, uint8 index, uint32 paramCount)
{
LOG_ERROR("sql.driver", "Attempted to bind parameter %u%s on a PreparedStatement %u (statement has only %u parameters)", uint32(index) + 1, (index == 1 ? "st" : (index == 2 ? "nd" : (index == 3 ? "rd" : "nd"))), stmtIndex, paramCount);
return false;
}
//- Bind on mysql level
void MySQLPreparedStatement::AssertValidIndex(uint8 index)
{
ASSERT(index < m_paramCount || ParamenterIndexAssertFail(m_stmt->GetIndex(), index, m_paramCount));
if (m_paramsSet[index])
LOG_ERROR("sql.sql", "[ERROR] Prepared Statement (id: %u) trying to bind value on already bound index (%u).", m_stmt->GetIndex(), index);
}
void MySQLPreparedStatement::SetParameter(uint8 index, std::nullptr_t)
{
AssertValidIndex(index);
m_paramsSet[index] = true;
MYSQL_BIND* param = &m_bind[index];
param->buffer_type = MYSQL_TYPE_NULL;
delete[] static_cast<char*>(param->buffer);
param->buffer = nullptr;
param->buffer_length = 0;
param->is_null_value = 1;
delete param->length;
param->length = nullptr;
}
void MySQLPreparedStatement::SetParameter(uint8 index, bool value)
{
SetParameter(index, uint8(value ? 1 : 0));
}
template<typename T>
void MySQLPreparedStatement::SetParameter(uint8 index, T value)
{
AssertValidIndex(index);
m_paramsSet[index] = true;
MYSQL_BIND* param = &m_bind[index];
uint32 len = uint32(sizeof(T));
param->buffer_type = MySQLType<T>::value;
delete[] static_cast<char*>(param->buffer);
param->buffer = new char[len];
param->buffer_length = 0;
param->is_null_value = 0;
param->length = nullptr; // Only != NULL for strings
param->is_unsigned = std::is_unsigned_v<T>;
memcpy(param->buffer, &value, len);
}
void MySQLPreparedStatement::SetParameter(uint8 index, std::string const& value)
{
AssertValidIndex(index);
m_paramsSet[index] = true;
MYSQL_BIND* param = &m_bind[index];
uint32 len = uint32(value.size());
param->buffer_type = MYSQL_TYPE_VAR_STRING;
delete [] static_cast<char*>(param->buffer);
param->buffer = new char[len];
param->buffer_length = len;
param->is_null_value = 0;
delete param->length;
param->length = new unsigned long(len);
memcpy(param->buffer, value.c_str(), len);
}
void MySQLPreparedStatement::SetParameter(uint8 index, std::vector<uint8> const& value)
{
AssertValidIndex(index);
m_paramsSet[index] = true;
MYSQL_BIND* param = &m_bind[index];
uint32 len = uint32(value.size());
param->buffer_type = MYSQL_TYPE_BLOB;
delete [] static_cast<char*>(param->buffer);
param->buffer = new char[len];
param->buffer_length = len;
param->is_null_value = 0;
delete param->length;
param->length = new unsigned long(len);
memcpy(param->buffer, value.data(), len);
}
std::string MySQLPreparedStatement::getQueryString() const
{
std::string queryString(m_queryString);
size_t pos = 0;
for (PreparedStatementData const& data : m_stmt->GetParameters())
{
pos = queryString.find('?', pos);
std::string replaceStr = std::visit([&](auto&& data)
{
return PreparedStatementData::ToString(data);
}, data.data);
queryString.replace(pos, 1, replaceStr);
pos += replaceStr.length();
}
return queryString;
}
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