vxodbc/columninfo.cc

   1 /*
   2  * Description: This module contains routines related to
   3  *              reading and storing the field information from a query.
   4  */
   5
   6 #include "pgtypes.h"
   7 #include "columninfo.h"
   8
   9 #include "connection.h"
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include "pgapifunc.h"
  13
  14 ColumnInfoClass *CI_Constructor()
  15 {
  16     ColumnInfoClass *rv;
  17
  18     rv = (ColumnInfoClass *) malloc(sizeof(ColumnInfoClass));
  19
  20     if (rv)
  21     {
  22         rv->num_fields = 0;
  23         rv->coli_array = NULL;
  24     }
  25
  26     return rv;
  27 }
  28
  29
  30 void CI_Destructor(ColumnInfoClass * self)
  31 {
  32     CI_free_memory(self);
  33
  34     free(self);
  35 }
  36
  37
  38 void CI_free_memory(ColumnInfoClass * self)
  39 {
  40     register Int2 lf;
  41     int num_fields = self->num_fields;
  42
  43     /* Safe to call even if null */
  44     self->num_fields = 0;
  45     if (self->coli_array)
  46     {
  47         for (lf = 0; lf < num_fields; lf++)
  48         {
  49             if (self->coli_array[lf].name)
  50             {
  51                 free(self->coli_array[lf].name);
  52                 self->coli_array[lf].name = NULL;
  53             }
  54         }
  55         free(self->coli_array);
  56         self->coli_array = NULL;
  57     }
  58 }
  59
  60
  61 #ifdef __cplusplus
  62 typedef ColumnInfoClass_::srvr_info  srvr_info;
  63 #endif
  64
  65 void
  66 CI_set_num_fields(ColumnInfoClass * self, int new_num_fields,
  67                   BOOL allocrelatt)
  68 {
  69     CI_free_memory(self);       /* always safe to call */
  70
  71     self->num_fields = new_num_fields;
  72
  73     self->coli_array = (srvr_info *)
  74         calloc(sizeof(srvr_info), self->num_fields);
  75 }
  76
  77
  78 void
  79 CI_set_field_info(ColumnInfoClass * self, int field_num,
  80                   const char *new_name,
  81                   OID new_adtid, Int2 new_adtsize, Int4 new_atttypmod,
  82                   OID new_relid, OID new_attid)
  83 {
  84     /* check bounds */
  85     if ((field_num < 0) || (field_num >= self->num_fields))
  86         return;
  87
  88     /* store the info */
  89     self->coli_array[field_num].name = strdup(new_name);
  90     self->coli_array[field_num].adtid = new_adtid;
  91     self->coli_array[field_num].adtsize = new_adtsize;
  92     self->coli_array[field_num].atttypmod = new_atttypmod;
  93
  94     self->coli_array[field_num].display_size = 0;
  95     self->coli_array[field_num].relid = new_relid;
  96     self->coli_array[field_num].attid = new_attid;
  97 }