TDbiFieldType.hxx

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#ifndef DBIFIELDTYPE_H
#define DBIFIELDTYPE_H


//////////////////////////////////////////////////////////////////////////
////////////////////////////     ROOT API     ////////////////////////////
//////////////////////////////////////////////////////////////////////////

/**
 *
 * $Id: TDbiFieldType.hxx,v 1.1 2011/01/18 05:49:20 finch Exp $
 *
 * \class TDbiFieldType
 *
 *
 * \brief
 * <b>Concept</b> Database neutral table column field types.
 *
 * \brief
 * <b>Purpose</b> To provide mappings and check compatibility between
 * database types and application types.
 *
 * Contact: A.Finch@lancaster.ac.uk
 *
 *
 */

#include <string>
using std::string;

#include "TDbi.hxx"


class TDbiFieldType
{


public:

 enum PrecisionLimits{ kMaxTinyInt       = 4,
                       kMaxSmallInt      = 6,
                       kMaxInt           = 11,
                       kMaxChar          = 3,
                       kMaxMySQLVarchar  = 255,
                       kMaxMySQLText     = 65535
};

// Constructors and destructors.
           TDbiFieldType(Int_t type = TDbi::kInt);
           TDbiFieldType(Int_t type,
                        Int_t size,
                        const char* typeName);
           TDbiFieldType(const TDbiFieldType& from);
           TDbiFieldType(const string& sql,
                        Int_t size);
  virtual ~TDbiFieldType();

// State testing member functions

 string AsString() const;
 string AsSQLString() const;
 string UndefinedValue() const;
 UInt_t GetConcept() const { return fConcept; }
 UInt_t GetSize() const { return fSize; }
 UInt_t GetType() const { return fType; }
 Bool_t IsCompatible(const TDbiFieldType& other) const;
 Bool_t IsEqual(const TDbiFieldType& other) const
                                        { return fType == other.fType; }
 Bool_t IsSmaller(const TDbiFieldType& other) const
                                  { return fSize < other.fSize; }
 Bool_t IsSigned() const          { return fConcept ==  TDbi::kInt; }


// State modifying member functions

   void SetUnsigned() {if (this->IsSigned()) {++fConcept; ++fType;}}

private:

void Init(Int_t type, Int_t size = -1);

// Data members

/// Concept e.g. kInt or kFloat
      unsigned int fConcept;
/// Size in bytes(0 if unknown).
      unsigned int fSize;
/// Concept e.g. kShort or kDouble
      unsigned int fType;

ClassDef(TDbiFieldType,0)        // Table column field types.

};


#endif  // DBIFIELDTYPE_H