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RAD Studio VCL Reference
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TDBXIsolations Class
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RAD Studio VCL Reference
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Isolation levels supported by TDBXTransaction.
TDBXIsolations = class;
class TDBXIsolations;
Isolation levels supported by the TDBXTransaction class. The isolation level indicates how much transactions can interact with each other.
This table shows isolation levels constants.
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Constant |
Description |
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Current transaction sees only changes that have been committed, but can receive an inconsistent view of the data if additional changes are committed before the transaction ends. | |
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Current transaction is guaranteed a consistent view of the data, which includes only changes committed by other transactions at the start of the transaction. | |
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Current transaction sees all changes made by other transactions, even if they have not yet been committed. This option is not available for the Oracle driver. | |
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Available since dbExpress 4. Current transaction sees no changes made by other transactions including phantoms. | |
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Available since dbExpress 4. Read only transaction that provides a transactionally consistent snapshot of the database. |
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Class Hierarchy