Class ODBPP::Segment

Used to represent an index segment within the index of a table.

class Segment{
public:
   int field;
   enum Mode mode;
};

Members

field

Valid values are -1 for the objectID and -2 for the row count with multi-entry indexes, all others values are the schema array index value of the field. The absolute field positon values for sub-table fields are as follws in the diagram below.
Image of Field Number Order

mode

Valid modes for types within CODBPP::B_TREE index types are CODBPP::ASTR and CODBPP::USTR are CODBPP::DESCENDING or CODBPP::INVERTED or (CODBPP::TO_UPPER_CASE xor CODBPP::TO_LOWER_CASE). Valid modes for all types are CODBPP::DESCENDING or CODBPP::NONE.

Valid modes for type within CODBPP::S_TREE indexes are CODBPP::NONE only.

Valid modes for type within CODBPP::A_LIST and CODBPP::U_LIST indexes are CODBPP::TOKEN_FIELD or (CODBPP::TO_UPPER_CASE xor CODBPP::TO_LOWER_CASE), the binary fields within a token index are by default value.

Remarks

Example Use

#include "ODBPP.h"

CODBPP::Segment index1Segments[] = {{0,(CODBPP::Mode)0}};
CODBPP::Index indexes[] = {{0,CODBPP::B_TREE,1,0,index1Segments}
CODBPP::Field fields[] = {
   {CODBPP::UINT32, 0, 4, 0,0,u"First"},
   {CODBPP::FLOAT64,8, 8, 0,0,u"Second"},
   {CODBPP::ASTR,   16,32,0,0,u"Third"}
};
CODBPP::Schema schema = {0,1,0,0,3,0,0,u"Table Name",NULL,fields, indexes};

int wmain(int argc, wchar_t* argv[])
{
   unsigned __int64 error;
   const char16_t *message;
   CODBPP database;
   if(database.OpenDatabase(u"YourDatabase") == NO_ERROR){
      if((error = database.BeginTransaction(CODBPP::EXCLUSIVE)) == NO_ERROR){
         if((error = database.CreateTable(&schema)) == NO_ERROR){
            ...
         }
      }
      if(error && database.GetErrorMessage(&message) == NO_ERROR)
         MessageBox(message);
      database.EndTransaction();
   }
   return NO_ERROR;
}

Also See

CreateTable, GetTableSchema, SetTableSchema

Listen All

Comments (0)

Contact Ekky

Thanks for your interest.

Ekky Software Customer Support Team.