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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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 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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