1: # include   <ingres.h>
   2: # include   <aux.h>
   3: # include   <access.h>
   4: # include   <symbol.h>
   5: # include   <catalog.h>
   6: # include   <sccs.h>
   7: 
   8: SCCSID(@(#)openr.c	8.4	1/22/85)
   9: 
  10: /*
  11: **  OPENR -- Open a relation into a descriptor
  12: **
  13: **	Openr will open the named relation into the given descriptor
  14: **	according to the mode specified. When searching for a name,
  15: **	a relation owner by the current user will be searched for first.
  16: **	If none is found then one owned by the DBA will be search for.
  17: **
  18: **	There are several available modes for opening a relation. The
  19: **	most common are
  20: **		mode OR_READ    -- open for reading
  21: **		mode OR_WRITE   -- open for writing.
  22: **	Other modes which can be used to optimize performance:
  23: **		mode OR_RELTID  -- get relation-relation tuple and tid only.
  24: **      			Does not open the relation.
  25: **		mode OR_AREAD   -- open relation for reading after a previous
  26: **      			call of mode OR_RELTID.
  27: **		mode OR_AWRITE  -- open relation for writing after a previous
  28: **      			call of mode OR_RELTID.
  29: **		mode OR_REREAD  -- open relation for reading. Assumes that relation
  30: **      			was previously open (eg relation & attributed
  31: **      			have been filled) and file was closed by closer.
  32: **		mode OR_REWRITE -- open relation for writing. Same assumptions as
  33: **      			mode OR_REREAD.
  34: **
  35: **	Parameters:
  36: **		dx - a pointer to a struct descriptor (defined in ingres.h)
  37: **		mode - can be OR_READ -> OR_REWRITE
  38: **		name - a null terminated name (only first 12 chars looked at)
  39: **
  40: **	Returns:
  41: **		1 - relation does not exist
  42: **		0 - ok
  43: **		<0 - error. Refer to the error codes in access.h
  44: **
  45: **	Side Effects:
  46: **		Opens the physical file if required. Fill the
  47: **		descriptor structure. Initializes the access methods
  48: **		if necessary.
  49: **
  50: **	Trace Flags:
  51: **		90
  52: */
  53: 
  54: 
  55: openr(d, mode, name)
  56: register DESC   *d;
  57: int     mode;
  58: char        *name;
  59: {
  60:     int     i;
  61:     register int    retval, filemode;
  62:     char        filename[MAXNAME+3];
  63:     char        btree[MAXNAME];
  64:     char        btreefile[MAXNAME + 3];
  65: #	ifdef xATR1
  66:     if (tTf(21, 0))
  67:         printf("openr:%.12s,%d\n", name, mode);
  68: #	endif
  69: 
  70:     /* init admin */
  71:     acc_init();
  72: 
  73:     /* process according to mode */
  74: 
  75:     filemode = O_RDONLY;
  76: 
  77:     if (mode >= 0)
  78:         d->relbtree = NULL;
  79: 
  80:     switch (mode)
  81:     {
  82: 
  83:       case OR_RELTID:
  84:         retval = get_reltup(d, name);
  85:         break;
  86: 
  87:       case OR_WRITE:
  88:         filemode = O_RDWR;
  89: 
  90:       case OR_READ:
  91:         if (retval = get_reltup(d, name))
  92:             break;
  93: 
  94:       case OR_AREAD:
  95:       case OR_AWRITE:
  96:         if (retval = get_attuples(d))
  97:             break;
  98: 
  99:       case OR_REWRITE:
 100:         if (mode == OR_AWRITE || mode == OR_REWRITE)
 101:             filemode = O_RDWR;
 102: 
 103:       case OR_REREAD:
 104:         clearkeys(d);
 105:         /* descriptor is filled. open file */
 106:         ingresname(d->reldum.relid, d->reldum.relowner, filename);
 107:         /* can't open a view */
 108:         if (d->reldum.relstat & S_VIEW)
 109:         {
 110:             retval = acc_err(AMOPNVIEW_ERR);    /* view */
 111:             break;
 112:         }
 113:         if ((d->relfp = open(filename, filemode)) < 0)
 114:         {
 115:             retval = acc_err(AMNOFILE_ERR); /* can't open file */
 116:             break;
 117:         }
 118:         d->relopn = (d->relfp + 1) * 5;
 119:         if (filemode == O_RDWR)
 120:             d->relopn = -d->relopn;
 121:         d->reladds = 0;
 122:         retval = 0;
 123:         break;
 124: 
 125:       default:
 126:         syserr("openr:bd md=%d", mode);
 127:     }
 128: 
 129:     if (mode == OR_RELTID && d->reldum.reldim > 0 && !retval)
 130:     {
 131:         /* open btreesec relation */
 132:         capital(d->reldum.relid, btree);
 133:         if ((d->relbtree = (DESC *) calloc(1, sizeof(DESC))) == NULL)
 134:             syserr("calloc error in openr");
 135:         if (i = openr(d->relbtree, OR_RELTID, btree))
 136:             syserr("opening Btreesec %s %d\n", btree, i);
 137:     }
 138: 
 139:     if (retval == 0 && d->reldum.reldim > 0 && mode != OR_RELTID)
 140:     {
 141:         capital(d->reldum.relid, btree);
 142:         if (d->relbtree == NULL)
 143:         {
 144:             if ((d->relbtree = (DESC *) calloc(1, sizeof(DESC))) == NULL)
 145:                 syserr("calloc error in openr");
 146:         }
 147:         if (i = openr(d->relbtree, mode, btree))
 148:             syserr("opening Btreesec %s %d\n", btree, i);
 149:         ingresname(d->reldum.relid, d->reldum.relowner, filename);
 150:         btreename(filename, btreefile);
 151:         if ((d->btree_fd = open(btreefile, O_RDWR)) < 0)
 152:             syserr("openr: can't open %s", btreefile);
 153:     }
 154: 
 155:     /* return */
 156: 
 157: #	ifdef xATR1
 158:     if (tTf(21, 4) && mode != OR_RELTID && retval != 1)
 159:         printdesc(d);
 160:     if (tTf(21, 0))
 161:         printf("openr rets %d\n", retval);
 162: #	endif
 163: 
 164:     return (retval);
 165: }
 166: /*
 167: **  GET_ATTUPLES -- get tuples from attribute relation for this relation
 168: */
 169: 
 170: get_attuples(d)
 171: register DESC   *d;
 172: {
 173:     struct attribute    attr, attkey;
 174:     register int        i, dom;
 175:     int         numatts;
 176:     TID         tid1, tid2;
 177: 
 178:     clearkeys(&Admin.adattd);
 179: 
 180:     /* zero all format types */
 181:     for (i = 0; i <= d->reldum.relatts; i++)
 182:         d->relfrmt[i] = 0;
 183: 
 184:     /* prepare to scan attribute relation */
 185:     setkey(&Admin.adattd, (char *) &attkey, d->reldum.relid, ATTRELID);
 186:     setkey(&Admin.adattd, (char *) &attkey, d->reldum.relowner, ATTOWNER);
 187:     if (i = find(&Admin.adattd, EXACTKEY, &tid1, &tid2, &attkey))
 188:         return (i);
 189: 
 190:     numatts = d->reldum.relatts;
 191: 
 192:     while (numatts && !get(&Admin.adattd, &tid1, &tid2, &attr, TRUE))
 193:     {
 194: 
 195:         /* does this attribute belong? */
 196:         if (bequal(&attr, &attkey, MAXNAME + 2))
 197:         {
 198: 
 199:             /* this attribute belongs */
 200:             dom = attr.attid;   /* get domain number */
 201: 
 202:             if (d->relfrmt[dom])
 203:                 break;  /* duplicate attribute. force error */
 204: 
 205:             numatts--;
 206:             d->reloff[dom] = attr.attoff;
 207:             d->relfrmt[dom] = attr.attfrmt;
 208:             d->relfrml[dom] = attr.attfrml;
 209:             d->relxtra[dom] = attr.attxtra;
 210:         }
 211:     }
 212: 
 213:     d->relfrmt[0] = INT;
 214:     d->relfrml[0] = 4;
 215:     /* make sure all the atributes were there */
 216:     for (dom = 1; dom <= d->reldum.relatts; dom++)
 217:         if (d->relfrmt[dom] == 0)
 218:             numatts = 1;    /* force an error */
 219:     if (numatts)
 220:         i = acc_err(AMNOATTS_ERR);
 221: 
 222:     flush_rel(&Admin.adattd, TRUE);
 223: 
 224: #	ifdef xATR1
 225:     if (tTf(21, 3))
 226:         printf("get_attr ret %d\n", i);
 227: #	endif
 228: 
 229:     return (i);
 230: }

Defined functions

get_attuples defined in line 170; used 1 times
  • in line 96
openr defined in line 8; used 3 times
Last modified: 1986-04-17
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