1: # include   "../ingres.h"
   2: # include   "../aux.h"
   3: # include   "../unix.h"
   4: # include   "../catalog.h"
   5: 
   6: 
   7: /*
   8: **  USERDESTROY -- auxiliary cleanup for destroy of a user relation
   9: **
  10: **	userdestroy is called during the destroy of a non system
  11: **	relation. If the relation is indexed or is itself an index
  12: **	then the appropriate action is taken. If it is indexed,
  13: **	then all secondary indices on the relation are also destroyed.
  14: **	If it is a secondary index, then the entry in the indexes relation
  15: **	is removed and the "relindxd" bit on the primary relation is
  16: **	cleared if this was the last index on the relation.
  17: **
  18: **	If the relation was a view or had integrity constraints or
  19: **	protection constraints on it, then those definitions are
  20: **	removed from the appropriate system catalogues.
  21: **
  22: **	Parameters:
  23: **		reltup -- the relation relation tuple.
  24: **
  25: **	Returns:
  26: **		none
  27: **
  28: **	Side Effects:
  29: **		zero or more system catalogues will be updated.
  30: **
  31: **	Called By:
  32: **		destroy
  33: **
  34: **	History:
  35: **		12/15/78 (rse) -- written (and taken from destroy.c)
  36: */
  37: 
  38: userdestroy(reltup)
  39: struct relation *reltup;
  40: {
  41:     register int            i;
  42:     register struct relation    *rel;
  43:     struct tup_id           tid, limtid;
  44:     char                newrelname[MAXNAME + 3];
  45:     extern struct descriptor    Reldes, Attdes, Inddes;
  46:     extern struct descriptor    Treedes, Intdes, Prodes;
  47:     struct relation         relt, relk;
  48:     struct index            indk, indt;
  49: 
  50:     rel = reltup;
  51: 
  52:     /* handle special case of destroying a secondary index */
  53:     if (rel->relindxd < 0)
  54:     {
  55:         opencatalog("indexes", 2);
  56:         setkey(&Inddes, &indk, rel->relid, IRELIDI);
  57:         setkey(&Inddes, &indk, rel->relowner, IOWNERP);
  58:         if ((i = getequal(&Inddes, &indk, &indt, &tid)) != 0)
  59:             syserr("destroy: geteq(ind,%.12s) %d", rel->relid, i);
  60: 
  61:         /* remove entry in INDEX catalog */
  62:         bmove(indt.irelidp, newrelname, MAXNAME);
  63:         bmove(indt.iownerp, &newrelname[MAXNAME], 2);
  64:         if ((i = delete(&Inddes, &tid)) != 0)
  65:             syserr("DESTROY: delete(ind/%.12s) %d", rel->relid, i);
  66:         clearkeys(&Inddes);
  67:         setkey(&Inddes, &indk, newrelname, IRELIDP);
  68:         setkey(&Inddes, &indk, &newrelname[MAXNAME], IOWNERP);
  69: 
  70:         /* reset relindxd field in relation catalog if no other indexes exist on this primary */
  71:         if (getequal(&Inddes, &indk, &indt, &tid) != 0)
  72:         {
  73:             clearkeys(&Reldes);
  74:             setkey(&Reldes, &relk, newrelname, RELID);
  75:             setkey(&Reldes, &relk, &newrelname[MAXNAME], RELOWNER);
  76:             if (i = getequal(&Reldes, &relk, &relt, &tid))
  77:                 syserr("destroy: getequal(rel, %s) %d", newrelname, i);
  78:             relt.relindxd = 0;
  79:             if ((i = replace(&Reldes, &tid, &relt, 0)) != 0)
  80:                 syserr("destroy: replace(rel) %d", i);
  81:         }
  82:     }
  83: 
  84:     /* check special case of destroying primary relation */
  85:     if (rel->relindxd > 0)
  86:     {
  87:         opencatalog("indexes", 2);
  88:         setkey(&Inddes, &indk, rel->relid, IRELIDP);
  89:         setkey(&Inddes, &indk, rel->relowner, IOWNERP);
  90:         if (i = find(&Inddes, EXACTKEY, &tid, &limtid, &indk))
  91:             syserr("destroy: find(ind,%.12s) %d", rel->relid, i);
  92:         while ((i = get(&Inddes, &tid, &limtid, &indt, TRUE)) == 0)
  93:         {
  94:             if (kcompare(&Inddes, &indk, &indt) != 0)
  95:                 continue;
  96:             if ((i = delete(&Inddes, &tid)) != 0)
  97:                 syserr("DESTROY: delete(ind/%.12s) %d", rel->relid, i);
  98:             clearkeys(&Reldes);
  99:             purgetup(&Reldes, indt.irelidi, RELID, indt.iownerp, RELOWNER, 0);
 100:             if (i = flush_rel(&Reldes, FALSE))  /* flush for recovery & concurrency reasons */
 101:                 syserr("destroy:flush irel %d", i);
 102:             purgetup(&Attdes, indt.irelidi, ATTRELID, indt.iownerp, ATTOWNER, 0);
 103:             ingresname(indt.irelidi, indt.iownerp, newrelname);
 104:             if (unlink(newrelname))
 105:                 syserr("destroy: unlink(%s)", newrelname);
 106:         }
 107:         if (i < 0)
 108:         {
 109:             syserr("destroy: get(ind) %d", i);
 110:         }
 111:     }
 112: 
 113:     /* if any integrity constraints exist, remove them */
 114:     if (rel->relstat & S_INTEG)
 115:     {
 116:         opencatalog("integrities", 2);
 117:         purgetup(&Intdes, rel->relid, INTRELID, rel->relowner, INTRELOWNER);
 118:     }
 119: 
 120:     /* if any protection clauses exist, remove them */
 121:     if (rel->relstat & S_PROTUPS)
 122:     {
 123:         opencatalog("protect", 2);
 124:         purgetup(&Prodes, rel->relid, PRORELID, rel->relowner, PRORELOWN);
 125:     }
 126: 
 127:     /* remove any trees associated with the relation */
 128:     if (rel->relstat & (S_PROTUPS | S_VIEW | S_INTEG))
 129:     {
 130:         opencatalog("tree", 2);
 131:         purgetup(&Treedes, rel->relid, TREERELID, rel->relowner, TREEOWNER);
 132:     }
 133: }

Defined functions

userdestroy defined in line 38; used 1 times
Last modified: 1980-12-17
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