const Status AttrCatalog::dropRelation(const string & relation)
{
Status status;
AttrDesc *attrs;
int attrCnt, i;
if (relation.empty())
return BADCATPARM;
// get attribute information
if ((status = getRelInfo(relation, attrCnt, attrs)) != OK)
return status;
// remove entries from catalog
for(i = 0; i < attrCnt; i++) {
if ((status = removeInfo(relation, attrs[i].attrName)) != OK)
return status;
}
free(attrs);
return OK;
}
//
// Drops a relation. It performs the following steps:
//
// removes the catalog entries for the relation
//
// Returns:
// OK on success
// error code otherwise
//
const Status AttrCatalog::dropRelation(const string & relation)
{
Status status;
AttrDesc *attrs;
if (relation.empty()) {
return BADCATPARM;
}
// find attribute info
int attrCnt;
status = getRelInfo(relation, attrCnt, attrs);
if (status!=OK) {
return status;
}
// delete entries from catalog
for (int i = 0; i < attrCnt; i++) {
status = removeInfo(relation, attrs[i].attrName);
if (status!=OK) {
return status;
}
}
free(attrs);
return OK;
}
const Status AttrCatalog::dropRelation(const string & relation)
{
Status status;
AttrDesc *attrs;
int attrCnt;
if (relation.empty())
return BADCATPARM;
//get attributes infomation of the relation
status = getRelInfo(relation,attrCnt,attrs);
if (status != OK) return status;
//removes the catalog entries in attrcat of the relation
for (int i=0; i < attrCnt; i++)
{
status = removeInfo(relation,attrs[i].attrName);
if (status != OK) return status;
}
delete [] attrs;
return OK;
}
const Status AttrCatalog::dropRelation(const string & relation)
{
Status status;
AttrDesc *attrs;
int attrCnt, i;
if (relation.empty()) return BADCATPARM;
status = getRelInfo(relation,attrCnt,attrs);
if(status !=OK)
{
return status;
}
for(i=0;i<attrCnt;i++)
{
status = removeInfo(relation,string(attrs->attrName));
if(status !=OK)
{
return status;
}
}
delete[] attrs;
return OK;
}
