sourcemod/extensions/mysql/mysql/MyStatement.cpp

/**
 * vim: set ts=4 :
 * ===============================================================
 * SourceMod MySQL Extension (C)2004-2007 AlliedModders LLC.  
 * All rights reserved.
 * ===============================================================
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License, 
 * version 3.0, as published by the Free Software Foundation.

 * 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, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, AlliedModders LLC gives you permission to 
 * link the code of this program (as well as its derivative works) to 
 * "Half-Life 2," the "Source Engine," the "SourcePawn JIT," and any 
 * Game MODs that run on software by the Valve Corporation.  You must 
 * obey the GNU General Public License in all respects for all other 
 * code used. Additionally, AlliedModders LLC grants this exception 
 * to all derivative works.
 * 
 * AlliedModders LLC defines further exceptions, found in LICENSE.txt
 * of the distribution (as of this writing, version JULY-31-2007), or
 * http://www.sourcemod.net/license.php
 *
 * Version: $Id$
 */

#include "MyStatement.h"
#include "MyBoundResults.h"

MyStatement::MyStatement(MyDatabase *db, MYSQL_STMT *stmt)
: m_mysql(db->m_mysql), m_pParent(db), m_stmt(stmt), m_rs(NULL), m_Results(false)
{
	m_Params = (unsigned int)mysql_stmt_param_count(m_stmt);

	if (m_Params)
	{
		m_pushinfo = (ParamBind *)malloc(sizeof(ParamBind) * m_Params);
		memset(m_pushinfo, 0, sizeof(ParamBind) * m_Params);
		m_bind = (MYSQL_BIND *)malloc(sizeof(MYSQL_BIND) * m_Params);
		memset(m_bind, 0, sizeof(MYSQL_BIND) * m_Params);
	} else {
		m_pushinfo = NULL;
		m_bind = NULL;
	}

	m_pParent->IncReferenceCount();

	m_pRes = mysql_stmt_result_metadata(stmt);
	m_Results = false;
}

MyStatement::~MyStatement()
{
	/* Free result set structures */
	delete m_rs;

	/* Free old blobs */
	for (unsigned int i=0; i<m_Params; i++)
	{
		free(m_pushinfo[i].blob);
	}

	/* Free our allocated arrays */
	free(m_pushinfo);
	free(m_bind);
	
	/* Close our mysql handles */
	if (m_pRes)
	{
		mysql_free_result(m_pRes);
	}
	mysql_stmt_close(m_stmt);

	/* Tell the parent database that we're done referencing it */
	m_pParent->Close();
}

void MyStatement::Destroy()
{
	delete this;
}

bool MyStatement::FetchMoreResults()
{
	/* Multiple result sets are not supported by statements,
	 * thank god.
	 */
	return false;
}

void *MyStatement::CopyBlob(unsigned int param, const void *blobptr, size_t length)
{
	void *copy_ptr = NULL;

	if (m_pushinfo[param].blob != NULL)
	{
		if (m_pushinfo[param].length < length)
		{
			free(m_pushinfo[param].blob);
		} else {
			copy_ptr = m_pushinfo[param].blob;
		}
	}

	if (copy_ptr == NULL)
	{
		copy_ptr = malloc(length);
		m_pushinfo[param].blob = copy_ptr;
		m_pushinfo[param].length = length;
	}

	memcpy(copy_ptr, blobptr, length);

	return copy_ptr;
}

bool MyStatement::BindParamInt(unsigned int param, int num, bool signd)
{
	if (param >= m_Params)
	{
		return false;
	}

	m_pushinfo[param].data.ival = num;
	m_bind[param].buffer_type = MYSQL_TYPE_LONG;
	m_bind[param].buffer = &(m_pushinfo[param].data.ival);
	m_bind[param].is_unsigned = signd ? 0 : 1;
	m_bind[param].length = NULL;

	return true;
}

bool MyStatement::BindParamFloat(unsigned int param, float f)
{
	if (param >= m_Params)
	{
		return false;
	}

	m_pushinfo[param].data.fval = f;
	m_bind[param].buffer_type = MYSQL_TYPE_FLOAT;
	m_bind[param].buffer = &(m_pushinfo[param].data.fval);
	m_bind[param].length = NULL;

	return true;
}

bool MyStatement::BindParamString(unsigned int param, const char *text, bool copy)
{
	if (param >= m_Params)
	{
		return false;
	}

	const void *final_ptr;
	size_t len;

	if (copy)
	{
		len = strlen(text);
		final_ptr = CopyBlob(param, text, len+1);
	} else {
		len = strlen(text);
		final_ptr = text;
	}

	m_bind[param].buffer_type = MYSQL_TYPE_STRING;
	m_bind[param].buffer = (void *)final_ptr;
	m_bind[param].buffer_length = (unsigned long)len;
	m_bind[param].length = &(m_bind[param].buffer_length);

	return true;
}

bool MyStatement::BindParamBlob(unsigned int param, const void *data, size_t length, bool copy)
{
	if (param >= m_Params)
	{
		return false;
	}

	const void *final_ptr;
	
	if (copy)
	{
		final_ptr = CopyBlob(param, data, length);
	} else {
		final_ptr = data;
	}

	m_bind[param].buffer_type = MYSQL_TYPE_BLOB;
	m_bind[param].buffer = (void *)final_ptr;
	m_bind[param].buffer_length = (unsigned long)length;
	m_bind[param].length = &(m_bind[param].buffer_length);

	return true;
}

bool MyStatement::BindParamNull(unsigned int param)
{
	if (param >= m_Params)
	{
		return false;
	}

	m_bind[param].buffer_type = MYSQL_TYPE_NULL;

	return true;
}

bool MyStatement::Execute()
{
	/* Clear any past result first! */
	m_Results = false;

	/* Bind the parameters */
	if (m_Params)
	{
		if (mysql_stmt_bind_param(m_stmt, m_bind) != 0)
		{
			return false;
		}
	}

	if (mysql_stmt_execute(m_stmt) != 0)
	{
		return false;
	}

	/* Skip away if we don't have data */
	if (!m_pRes)
	{
		return true;
	}

	/* If we don't have a result manager, create one. */
	if (!m_rs)
	{
		m_rs = new MyBoundResults(m_stmt, m_pRes);
	}

	/* Tell the result set to update its bind info,
	 * and initialize itself if necessary.
	 */
	if (!(m_Results = m_rs->Initialize()))
	{
		return false;
	}

	/* Try precaching the results. */
	m_Results = (mysql_stmt_store_result(m_stmt) == 0);

	/* Update now that the data is known. */
	m_rs->Update();

	/* Return indicator */
	return m_Results;
}

const char *MyStatement::GetError(int *errCode/* =NULL */)
{
	if (errCode)
	{
		*errCode = mysql_stmt_errno(m_stmt);
	}

	return mysql_stmt_error(m_stmt);
}

unsigned int MyStatement::GetAffectedRows()
{
	return (unsigned int)mysql_stmt_affected_rows(m_stmt);
}

unsigned int MyStatement::GetInsertID()
{
	return (unsigned int)mysql_stmt_insert_id(m_stmt);
}

IResultSet *MyStatement::GetResultSet()
{
	return (m_Results ? m_rs : NULL);
}