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