1: # include   <pv.h>
   2: # include   <ingres.h>
   3: # include   <aux.h>
   4: # include   <catalog.h>
   5: # include   <func.h>
   6: # include   <sccs.h>
   7: # include   <errors.h>
   8: 
   9: SCCSID(@(#)destroy.c	8.3	2/8/85)
  10: 
  11: extern  short   tTdbu[];
  12: extern  int destroy();
  13: extern  int null_fn();
  14: 
  15: struct fn_def DstroyFn =
  16: {
  17:     "DESTROY",
  18:     destroy,
  19:     null_fn,
  20:     null_fn,
  21:     NULL,
  22:     0,
  23:     tTdbu,
  24:     100,
  25:     'Z',
  26:     0
  27: };
  28: 
  29: 
  30: /*
  31: **  DESTROY RELATION
  32: **
  33: **	The relations in pv are destroyed.  This involves three steps:
  34: **	1 - remove tuple from relation relation
  35: **	2 - remove tuples from attribute relation
  36: **	3 - unlink physical file
  37: **
  38: **	If the relation is a secondary index, the entry is removed
  39: **	from the index relation, and the primary relation is set to
  40: **	be "not indexed" (unless there is another index on it).
  41: **
  42: **	If the relation has an index, all its indexes are also
  43: **	destroyed.
  44: **
  45: **	If any errors occured while destroying the relations,
  46: **	then the last error number is returned, otherwise
  47: **	0 is returned.
  48: **
  49: **	If any query modification was defined on the relation,
  50: **	the qrymod catalogues are updated.
  51: **
  52: **	Trace Flags:
  53: **		32
  54: */
  55: 
  56: destroy(pc, pv)
  57: int pc;
  58: PARM    *pv;
  59: {
  60:     register int    i, ret;
  61:     register char   *name;
  62: 
  63:     opencatalog("relation", OR_WRITE);
  64:     opencatalog("attribute", OR_WRITE);
  65: 
  66:     for (ret = 0; pc-- > 0; )
  67:     {
  68:         name = ((pv++)->pv_val).pv_str;
  69:         if (i = des(name))
  70:             ret = i;
  71:     }
  72:     return (ret);
  73: }
  74: 
  75: 
  76: des(name)
  77: char    *name;
  78: {
  79:     register int    i;
  80:     register char   *relname;
  81:     struct tup_id   tid;
  82:     char        newrelname[MAXNAME + 3];
  83:     extern DESC Reldes, Attdes, Inddes, Treedes;
  84:     struct relation relt, relk;
  85: 
  86:     relname = name;
  87: #	ifdef xZTR1
  88:     tTfp(32, -1, "destroy: %s\n", relname);
  89: #	endif
  90: 
  91:     newrelname[MAXNAME + 2] = 0;
  92: 
  93:     /* get the tuple from relation relation */
  94:     setkey(&Reldes, &relk, relname, RELID);
  95:     setkey(&Reldes, &relk, Usercode, RELOWNER);
  96:     if ((i = getequal(&Reldes, &relk, &relt, &tid)) != 0)
  97:     {
  98:         if (i < 0)
  99:             syserr("DESTROY: geteq(rel/%s) %d", relname, i);
 100:         return (nferror(RELNOEXIST, relname, 0));   /* nonexistant relation */
 101:     }
 102: 
 103:     /* don't allow a system relation to be destroyed */
 104:     if (relt.relstat & S_CATALOG)
 105:         return (nferror(NODESTSYSREL, relname, 0)); /* attempt to destroy system catalog */
 106: 
 107:     if ((i = delete(&Reldes, &tid)) != 0)
 108:         syserr("DESTROY: delete(rel) %d", i);
 109: 
 110:     /*
 111: 	** for concurrency reasons, flush the relation-relation page
 112: 	** where the tuple was just deleted. This will prevent anyone
 113: 	** from being able to "openr" the relation while it is being
 114: 	** destroyed. It also allows recovery to finish the destroy
 115: 	** it the system crashes during this destroy.
 116: 	*/
 117:     if (i = flush_rel(&Reldes, FALSE))
 118:         syserr("destroy:flush rel %d", i);
 119: 
 120:     purgetup(&Attdes, relt.relid, ATTRELID, relt.relowner, ATTOWNER, 0);
 121: 
 122:     /*
 123: 	**	If this is a user relation, then additional processing
 124: 	**	might be needed to clean up indicies, protection constraints
 125: 	**	etc.
 126: 	*/
 127:     if ((relt.relstat & S_CATALOG) == 0)
 128:         userdestroy(&relt);
 129: 
 130:     if ((relt.relstat & S_VIEW) == 0)
 131:     {
 132:         ingresname(relname, Usercode, newrelname);
 133:         if (unlink(newrelname) < 0)
 134:             syserr("destroy: unlink(%.14s)", newrelname);
 135:     }
 136:     return (0);
 137: 
 138: }

Defined functions

des defined in line 76; used 1 times
  • in line 69
destroy defined in line 56; used 5 times

Defined variables

DstroyFn defined in line 15; never used
Last modified: 1986-04-17
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