offapi/com/sun/star/sdbc/TransactionIsolation.idl

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  27 #ifndef __com_sun_star_sdbc_TransactionIsolation_idl__
  28 #define __com_sun_star_sdbc_TransactionIsolation_idl__
  29
  30  module com {  module sun {  module star {  module sdbc {
  31
  32
  33 /** distinguishes different possible transaction isolation levels.
  34  */
  35 published constants TransactionIsolation
  36 {
  37
  38     /** indicates that transactions are not supported.
  39      */
  40     const long NONE                 =  0;
  41
  42     /** Dirty reads, non-repeatable reads and phantom reads can occur.
  43              This level allows a row changed by one transaction to be read
  44              by another transaction before any changes in that row have been
  45              committed (a "dirty read").  If any of the changes are rolled back,
  46              the second transaction will have retrieved an invalid row.
  47      */
  48     const long READ_UNCOMMITTED     =  1;
  49
  50     /** Dirty reads are prevented; non-repeatable reads and phantom
  51              reads can occur.  This level only prohibits a transaction
  52              from reading a row with uncommitted changes in it.
  53      */
  54     const long READ_COMMITTED       =  2;
  55
  56     /** Dirty reads and non-repeatable reads are prevented; phantom
  57              reads can occur.  This level prohibits a transaction from
  58              reading a row with uncommitted changes in it, and it also
  59              prohibits the situation where one transaction reads a row,
  60              a second transaction alters the row, and the first transaction
  61              rereads the row, getting different values the second time
  62              (a "non-repeatable read").
  63      */
  64     const long REPEATABLE_READ      =  4;
  65
  66     /** Dirty reads, non-repeatable reads and phantom reads are prevented.
  67              This level includes the prohibitions in
  68              <code>REPEATABLE_READ</code>
  69              and further prohibits the
  70              situation where one transaction reads all rows that satisfy
  71              a WHERE condition, a second transaction inserts a row that
  72              satisfies that WHERE condition, and the first transaction
  73              rereads for the same condition, retrieving the additional
  74              "phantom" row in the second read.
  75      */
  76     const long SERIALIZABLE         =  8;
  77 };
  78
  79 //=============================================================================
  80
  81 }; }; }; };
  82
  83 /*===========================================================================
  84 ===========================================================================*/
  85 #endif