/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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* License , v . 2 . 0 . If a copy of the MPL was not distributed with this
* file , You can obtain one at http : //mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice :
*
* Licensed to the Apache Software Foundation ( ASF ) under one or more
* contributor license agreements . See the NOTICE file distributed
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* ownership . The ASF licenses this file to you under the Apache
* License , Version 2 . 0 ( the " License " ) ; you may not use this file
* except in compliance with the License . You may obtain a copy of
* the License at http : //www.apache.org/licenses/LICENSE-2.0 .
*/
module com { module sun { module star { module sdbc {
/** distinguishes different possible transaction isolation levels.
*/
published constants TransactionIsolation
{
/** indicates that transactions are not supported.
*/
const long NONE = 0 ;
/** Dirty reads, non-repeatable reads and phantom reads can occur.
This level allows a row changed by one transaction to be read
by another transaction before any changes in that row have been
committed ( a " dirty read " ) . If any of the changes are rolled back ,
the second transaction will have retrieved an invalid row .
*/
const long READ_UNCOMMITTED = 1 ;
/** Dirty reads are prevented; non-repeatable reads and phantom
reads can occur . This level only prohibits a transaction
from reading a row with uncommitted changes in it .
*/
const long READ_COMMITTED = 2 ;
/** Dirty reads and non-repeatable reads are prevented; phantom
reads can occur . This level prohibits a transaction from
reading a row with uncommitted changes in it , and it also
prohibits the situation where one transaction reads a row ,
a second transaction alters the row , and the first transaction
rereads the row , getting different values the second time
( a " non - repeatable read " ) .
*/
const long REPEATABLE_READ = 4 ;
/** Dirty reads, non-repeatable reads and phantom reads are prevented.
This level includes the prohibitions in
< code > REPEATABLE_READ < / code >
and further prohibits the
situation where one transaction reads all rows that satisfy
a WHERE condition , a second transaction inserts a row that
satisfies that WHERE condition , and the first transaction
rereads for the same condition , retrieving the additional
" phantom " row in the second read .
*/
const long SERIALIZABLE = 8 ;
};
}; }; }; };
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