cardinality_t dbAnyCursor::selectByKeyRange(dbFieldDescriptor* field, void const* minValue,
void const* maxValue)
{
assert(field->tTree != 0);
reset();
db->beginTransaction(type == dbCursorForUpdate
? dbDatabase::dbExclusiveLock : dbDatabase::dbSharedLock);
db->threadContext.get()->cursors.link(this);
dbSearchContext sc;
sc.db = db;
sc.probes = 0;
sc.offs = field->dbsOffs;
sc.cursor = this;
sc.condition = NULL;
sc.prefixLength = 0;
sc.firstKey = (char*)minValue;
sc.lastKey = (char*)maxValue;
sc.firstKeyInclusion = sc.lastKeyInclusion = true;
sc.field = field;
sc.type = field->type;
dbTtree::find(db, field->tTree, sc);
if (gotoFirst() && prefetch) {
fetch();
}
return selection.nRows;
}
int dbAnyCursor::selectByKey(char const* key, void const* value)
{
dbFieldDescriptor* field = table->find(key);
assert(field != NULL);
assert(field->hashTable != 0 || field->tTree != 0);
reset();
db->beginTransaction(type == dbCursorForUpdate
? dbDatabase::dbExclusiveLock : dbDatabase::dbSharedLock);
db->threadContext.get()->cursors.link(this);
dbSearchContext sc;
sc.db = db;
sc.probes = 0;
sc.offs = field->dbsOffs;
sc.cursor = this;
sc.condition = NULL;
sc.prefixLength = 0;
sc.firstKey = sc.lastKey = (char*)value;
sc.firstKeyInclusion = sc.lastKeyInclusion = true;
sc.comparator = field->comparator;
sc.sizeofType = field->dbsSize;
sc.type = field->type;
if (field->hashTable != 0) {
dbHashTable::find(db, field->hashTable, sc);
} else {
dbTtree::find(db, field->tTree, sc);
}
if (gotoFirst() && prefetch) {
fetch();
}
return selection.nRows;
}
int dbAnyCursor::seek(oid_t oid)
{
int pos = 0;
if (gotoFirst()) {
do {
if (currId == oid) {
if (prefetch) {
fetch();
}
return pos;
}
pos += 1;
} while (gotoNext());
}
return -1;
}
