RS.Open SQL, CONN, A, BA: AdopenForwardonly (= 0) read-only, and current data records can only move AdopenKeySet (= 1) read-only, current data records can be free to move adopendynamic (= 2) readable writing The current data record is free to move adopenStatic (= 3) readable writing, the current data record is free to move, can see new record B: AdlockReadOnly (= 1) Default lock type, record set is read-only, can not be modified Record AdlockPESSIMISTIC (= 2) Pessimism, when modified records, the data provider will attempt to lock the record to ensure successfully editing the record. As long as the editing start, lock the record immediately. AdlockOptimistic (= 3) Optimistic lock until the record is locked when you submit an update record with an UPDATE method. Adlockbatchoptimistic (= 4) Batch optimism locks, allowing multiple records to be modified, only to lock the record only after calling the UpdateBatch method.
