TSQLColumnInfo

    public:

                      TSQLColumnInfo()
                      TSQLColumnInfo(const char* columnname, const char* sqltypename = "unknown", Bool_t nullable = kFALSE, Int_t sqltype = -1, Int_t size = -1, Int_t length = -1, Int_t scale = -1, Int_t sign = -1)
                      TSQLColumnInfo(const TSQLColumnInfo&)
              virtual ~TSQLColumnInfo()
       static TClass* Class()
                Int_t GetLength() const
                Int_t GetScale() const
                Int_t GetSigned() const
                Int_t GetSize() const
                Int_t GetSQLType() const
          const char* GetTypeName() const
      virtual TClass* IsA() const
               Bool_t IsNullable() const
               Bool_t IsSigned() const
               Bool_t IsUnsigned() const
      TSQLColumnInfo& operator=(const TSQLColumnInfo&)
         virtual void Print(Option_t* option = "") const
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)

    protected:

      TString fTypeName  ! sql type name, as reported by DB. Should be as much as close to declaration of column in CREATE TABLE query
        Int_t fSQLType   ! datatype code (see TSQLServer::ESQLDataTypes constants), -1 if not defeined
        Int_t fSize      ! size of column in bytes, -1 if not defing
        Int_t fLength    ! datatype length definition, for instance VARCHAR(len) or FLOAT(len), -1 if not defined
        Int_t fScale     ! datatype scale factor, used for instance in NUMBER(len,scale) definition. -1 if not defined
        Int_t fSigned    ! if datatype signed or not, 0 - kFALSE, 1 - kTRUE, -1 - unknown
       Bool_t fNullable  ! identify if value can be NULL 

Class Description

 TSQLColumnInfo

 Contains information about single column from SQL table
 Has following methods:
   GetTypeName() - field type name in string form as it is reported by correspondent
          database method. Some databases providing full type name like "numeric(20)",
          other showing only "NUMERIC". As a result, one cannot use this string directly
          to create new field of similar types in other table
   IsNullable() - says if field value can be NULL or not
   GetSQLType() - returns kind of sql type. Possible values:
      TSQLServer::kSQL_NONE        data type unknown
      TSQLServer::kSQL_CHAR        CHAR(n) - string with fixed length n
      TSQLServer::kSQL_VARCHAR     VARCHAR(n) - string with variable length upto n
      TSQLServer::kSQL_INTEGER     INTEGER, INT, TINYINT - any integer types
      TSQLServer::kSQL_FLOAT       FLOAT - float value
      TSQLServer::kSQL_DOUBLE      DOUBLE - double precision value
      TSQLServer::kSQL_NUMERIC     NUMERIC(n,s), NUMBER(n,s) - numeric values with length and precion
      TSQLServer::kSQL_BINARY      BLOB, VARBINARY  - binary data (vriable or fixed size)
      TSQLServer::kSQL_TIMESTAMP   TIMESTAMP - time and date stamp
   GetSize() - size of field in database. -1 if not known.
   GetLength() - length argument in type declaration like CHAR(len) or NUMERIC(len), -1 if not defined
   GetScale() - second argument in declarations like NUMERIC(len, s), -1 if not defined
   GetSigned() - is type signed(==1) or unsigned(==0), -1 if not defined

 default contructor

 normal constructor

 Prints column information to standard output