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|  | 
| const long | NONE = 0 | 
|  | indicates that transactions are not supported. 
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| const long | READ_UNCOMMITTED = 1 | 
|  | Dirty reads, non-repeatable reads and phantom reads can occur. 
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| const long | READ_COMMITTED = 2 | 
|  | Dirty reads are prevented; non-repeatable reads and phantom reads can occur. 
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| const long | REPEATABLE_READ = 4 | 
|  | Dirty reads and non-repeatable reads are prevented; phantom reads can occur. 
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| const long | SERIALIZABLE = 8 | 
|  | Dirty reads, non-repeatable reads and phantom reads are prevented. 
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