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#pragma once
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#include <string>
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#include <vector>
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#include "sqldatetime.h"
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class CSqlVariant
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{
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public:
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enum Type
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{
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Invalid = 0,
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Bool,
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Char,
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UChar,
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Short,
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UShort,
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Int,
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UInt,
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LongLong,
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ULongLong,
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Float,
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Double,
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Date,
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Time,
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DateTime,
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String,
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ByteArray
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};
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public:
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CSqlVariant();
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CSqlVariant(Type type);
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CSqlVariant(char v);
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CSqlVariant(bool v);
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CSqlVariant(int v);
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CSqlVariant(unsigned int v);
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CSqlVariant(long long v);
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CSqlVariant(unsigned long long v);
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CSqlVariant(float v);
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CSqlVariant(double v);
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CSqlVariant(short v);
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CSqlVariant(unsigned short v);
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CSqlVariant(unsigned char v);
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CSqlVariant(const CSqlDate &v);
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CSqlVariant(const CSqlTime &v);
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CSqlVariant(const CSqlDateTime &v);
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CSqlVariant(const char *v);
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CSqlVariant(const char* v,unsigned int len,bool bIsByteArray);
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CSqlVariant(const std::string &v ,bool bIsByteArray= false);
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CSqlVariant(const CSqlVariant &O);
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CSqlVariant &operator=(const CSqlVariant &o);
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~CSqlVariant();
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bool operator==(const CSqlVariant &o) const;
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bool operator!=(const CSqlVariant &o) const;
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template<typename T> T ToValue() const { T v; ToValue(v); return v; }
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int ToValue(int &v)const;
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unsigned int ToValue(unsigned int &v) const;
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long long ToValue(long long &v) const;
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unsigned long long ToValue(unsigned long long &v) const;
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bool ToValue(bool &v)const;
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float ToValue(float &v) const;
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double ToValue(double &v)const;
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std::string & ToValue(std::string &v) const;
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char ToValue(char &v) const;
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unsigned char ToValue(unsigned char &v) const;
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short ToValue(short &v)const;
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unsigned short ToValue(unsigned short &v) const;
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CSqlDate & ToValue(CSqlDate &v)const;
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CSqlTime & ToValue(CSqlTime &v)const;
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CSqlDateTime & ToValue(CSqlDateTime &v)const;
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const void *GetData()const;
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unsigned int GetDataLen()const;
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void* GetBuffer();
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int GetBufferLen()const;
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void SetDataLen(int nlen);
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void SetBufferLen(int nlen);
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void ReleaseBuffer();
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void SetType(Type type);
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Type GetType()const;
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const char*GetTypeName()const;
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bool CanConvertTo(Type t)const;
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bool IsNull()const;
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void SetNull(bool bNull);
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private:
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void CopyFrom(const CSqlVariant &o);
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void InitBuffer(unsigned int len);
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void InitData(const char*v,unsigned int len);
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void FreeBuffer();
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union
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{
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bool b;
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char c;
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unsigned char uc;
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short s;
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unsigned short us;
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int i;
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unsigned int ui; //also store the time,date
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long long ll;
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unsigned long long ull; //also store the datetime
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float f;
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double d;
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int *p; //format :[ref_count][buf_len][data_len][data][....] ,<2C><><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD>ݿ<EFBFBD><DDBF>Թ<EFBFBD><D4B9><EFBFBD>ʹ<EFBFBD>á<EFBFBD><C3A1>̲߳<DFB3><CCB2><EFBFBD>ȫ
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// p[0] p[1] p[2] [p3]
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} m_data;
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Type m_type;
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unsigned int m_is_null;
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};
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#define VARINTARR std::vector<CSqlVariant>
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