Update from SDK 2013

utils/vmpi/mysql_wrapper.h

@@ -0,0 +1,104 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef MYSQL_WRAPPER_H
+#define MYSQL_WRAPPER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "utlvector.h"
+
+
+class IMySQL;
+
+
+// This is a helper class to build queries like the stream IO.
+class CMySQLQuery
+{
+friend class CMySQL;
+
+public:
+	// This is like a sprintf, but it will grow the string as necessary.
+	void				Format( PRINTF_FORMAT_STRING const char *pFormat, ... );
+
+private:
+	CUtlVector<char>	m_QueryText;
+};
+
+
+class CColumnValue
+{
+public:
+
+					CColumnValue( CMySQL *pSQL, int iColumn );
+
+	const char*		String();
+	long			Int32();
+	unsigned long	UInt32();
+
+private:
+	CMySQL		*m_pSQL;
+	int			m_iColumn;
+};
+
+
+class IMySQL
+{
+public:
+	virtual void			Release() = 0;
+
+	// These execute SQL commands. They return 0 if the query was successful.
+	virtual int				Execute( const char *pString ) = 0;
+	virtual int				Execute( CMySQLQuery &query ) = 0;
+
+	// If you just inserted rows into a table with an AUTO_INCREMENT column,
+	// then this returns the (unique) value of that column.
+	virtual unsigned long	InsertID() = 0;
+
+	// If you just executed a select statement, then you can use these functions to
+	// iterate over the result set.
+
+	// Get the number of columns in the data returned from the last query (if it was a select statement).	
+	virtual int				NumFields() = 0;
+	
+	// Get the name of each column returned by the last query.
+	virtual const char*		GetFieldName( int iColumn ) = 0;
+
+	// Call this in a loop until it returns false to iterate over all rows the query returned.
+	virtual bool			NextRow() = 0;
+
+	// You can call this to start iterating over the result set from the start again.
+	// Note: after calling this, you have to call NextRow() to actually get the first row's value ready.
+	virtual bool			SeekToFirstRow() = 0;
+
+	virtual CColumnValue	GetColumnValue( int iColumn ) = 0;
+	virtual CColumnValue	GetColumnValue( const char *pColumnName ) = 0;
+
+	// You can call this to get the index of a column for faster lookups with GetColumnValue( int ).
+	// Returns -1 if the column can't be found.
+	virtual int				GetColumnIndex( const char *pColumnName ) = 0;
+};
+
+
+IMySQL* InitMySQL( const char *pDBName, const char *pHostName="", const char *pUserName="", const char *pPassword="" );
+
+
+
+// ------------------------------------------------------------------------------------------------ //
+// Inlines.
+// ------------------------------------------------------------------------------------------------ //
+
+inline CColumnValue::CColumnValue( CMySQL *pSQL, int iColumn )
+{
+	m_pSQL = pSQL;
+	m_iColumn = iColumn;
+}
+
+
+#endif // MYSQL_WRAPPER_H