coldata1.hh
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上传日期:2019-04-29
资源大小:56270k
文件大小:5k
- #ifndef __coldata1_hh__
- #define __coldata1_hh__
- #include <typeinfo>
- #include <string>
- using namespace std ;
- #include "defs.h"
- #include "type_info1.hh"
- #include "const_string1.hh"
- #include "null1.hh"
- // prevention of VC++ INTERNAL COMPILER ERROR
- #include "convert3.hh"
- #include "string_util.hh"
- //! with_class = mysql_ColData
- //: Exception structure thrown when a bad conversion takes place
- struct BadConversion {
- const char* type_name; //:
- const string data; //:
- size_t retrieved; //:
- size_t actual_size;//:
- BadConversion(const char* tn, const char* d, size_t r, size_t a) : type_name(tn), data(d), retrieved(r), actual_size(a) {};
- };
- //: Base class for auto-converting column data. Do not use directly.
- //
- // A smart string. It will automatically convert it self to any of the
- // basic C types.
- //
- // When used with binary operators it will
- // automatically convert it self to the type used on the other side of
- // the operator if it is a basic type.
- //
- // However, be careful when using it with binary operators as.
- //
- // MysqlStr("12.86") + 2
- //
- // will return 14 because 2 is an integer. What you wanted to say was
- //
- // MysqlStr("12.86") + 2.0
- //
- // If this type of thing scares you define the micro NO_BINARY_OPERS
- // to turn of this behavior.
- //
- // This class also has some basic information about the type of data
- // stored in it.
- //
- // <bf>Do not use this class directly.</bf>
- // Use the typedef ColData or MutableColData instead.
- template <class Str>
- class mysql_ColData : public Str {
- private:
- mysql_type_info _type;
- string buf;
- bool _null;
- public:
- mysql_ColData (bool n, mysql_type_info t = mysql_type_info::string_type)
- : _type(t), _null(n) {}
- mysql_ColData (const char *str,
- mysql_type_info t = mysql_type_info::string_type, bool n = false)
- : Str(str), _type(t), _null(n) {buf=(string)str;}
- mysql_ColData () {}
- mysql_type_info type() {return _type;}
- //: Returns the current mysql type of current item
- bool quote_q() const {return _type.quote_q();}
- //: Returns true or false depending on if the data is of a type that
- //: should be quoted
- bool escape_q() const {return _type.escape_q();}
- //: Returns true of false depending on if the data is of a type that
- //: should be escaped
-
- //template<class Type> Type conv (Type dummy) const;
- // FIX: function conv implemented here VC++ INTERNAL COMPILER ERROR
- template<class Type> Type conv (Type dummy) const {
- string strbuf(buf);
- strip_all_blanks(strbuf);
- size_t len = strbuf.size();
- const char *str = strbuf.c_str();
- const char *end = str;
- Type num = mysql_convert<Type>(str, end);
- if (*end == '.') {
- end++;
- for (;*end == '0'; end++);
- }
- if (*end != ' ' && end != NULL ) {
- throw BadConversion (typeid(Type).name(), c_str(), end - str, len);
- }
- return num;
- }
- //!dummy: operator TYPE() const;
- //: Converts the column data to TYPE.
- // If all the charters are not read during the conversion to TYPE it
- // will through BadConversion.
- //
- // TYPE is defined for all the build in types.
- //
- // (Note, This is not an actual template)
- void it_is_null (void) {_null=true;}
- inline const bool is_null(void) const {return _null;}
- inline const string& get_string(void) const {return buf;}
- operator cchar*() const {return buf.c_str();}
- operator signed char() const {return conv((signed char)0);}
- operator unsigned char() const {return conv((unsigned char)0);}
- operator int() const {return conv((int)0);}
- operator unsigned int() const {return conv((unsigned int)0);}
- operator short int() const {return conv((short int)0);}
- operator unsigned short int() const {return conv((unsigned short int)0);}
- operator long int() const {return conv((long int)0);}
- operator unsigned long int() const {return conv((unsigned long int)0);}
- #ifndef NO_LONG_LONGS
- operator longlong() const {return conv((longlong)0);}
- operator ulonglong() const {return conv((ulonglong)0);}
- #endif
- operator float() const {return conv((float)0);}
- operator double() const {return conv((double)0);}
- template <class T, class B> operator Null<T,B> () const;
- };
- //: The Type that is returned by constant rows
- typedef mysql_ColData<const_string> ColData;
- //: The Type that is returned by mutable rows
- typedef mysql_ColData<string> MutableColData;
- //: For backwards compatibility. Do not use.
- typedef ColData MysqlString;
- //: For backwards compatibility. Do not use.
- typedef ColData MysqlStr;
- #endif