Specifies the lock mode. 
Unit
DBAccess
 Syntax
TLockMode = (lmNone, lmPessimistic, lmOptimistic);
Values
  
    | Value |     Meaning |   
  
    | 
lmNone     | 
    
No locking occurs. This mode should only be used in single user applications. The default value.      | 
  
  
    | 
lmOptimistic     | 
    
Locking occurs when the user posts an edited record, then the lock is released. Locking is done by the RefreshRecord method.      | 
  
  
    | 
lmPessimistic     | 
    
Locking occurs when the user starts editing a record. The lock is released after the user has posted or canceled the changes.      |