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authorFluorescentCIAAfricanAmerican <[email protected]>2020-04-22 12:56:21 -0400
committerFluorescentCIAAfricanAmerican <[email protected]>2020-04-22 12:56:21 -0400
commit3bf9df6b2785fa6d951086978a3e66f49427166a (patch)
tree2c0f1f0c63c4832882bc93814ebd2c2b1c6224e5 /utils/vmpi/mysql_wrapper.h
downloadarchived-source-engine-2018-hl2-src-master.tar.xz
archived-source-engine-2018-hl2-src-master.zip
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+//========= 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