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

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  28 #ifndef __com_sun_star_sdbc_TransactionIsolation_idl__
  29 #define __com_sun_star_sdbc_TransactionIsolation_idl__
  30
  31  module com {  module sun {  module star {  module sdbc {
  32
  33
  34 /** distinguishes different possible transaction isolation levels.
  35  */
  36 published constants TransactionIsolation
  37 {
  38
  39     /** indicates that transactions are not supported.
  40      */
  41     const long NONE                 =  0;
  42
  43     /** Dirty reads, non-repeatable reads and phantom reads can occur.
  44              This level allows a row changed by one transaction to be read
  45              by another transaction before any changes in that row have been
  46              committed (a "dirty read").  If any of the changes are rolled back,
  47              the second transaction will have retrieved an invalid row.
  48      */
  49     const long READ_UNCOMMITTED     =  1;
  50
  51     /** Dirty reads are prevented; non-repeatable reads and phantom
  52              reads can occur.  This level only prohibits a transaction
  53              from reading a row with uncommitted changes in it.
  54      */
  55     const long READ_COMMITTED       =  2;
  56
  57     /** Dirty reads and non-repeatable reads are prevented; phantom
  58              reads can occur.  This level prohibits a transaction from
  59              reading a row with uncommitted changes in it, and it also
  60              prohibits the situation where one transaction reads a row,
  61              a second transaction alters the row, and the first transaction
  62              rereads the row, getting different values the second time
  63              (a "non-repeatable read").
  64      */
  65     const long REPEATABLE_READ      =  4;
  66
  67     /** Dirty reads, non-repeatable reads and phantom reads are prevented.
  68              This level includes the prohibitions in
  69              <code>REPEATABLE_READ</code>
  70              and further prohibits the
  71              situation where one transaction reads all rows that satisfy
  72              a WHERE condition, a second transaction inserts a row that
  73              satisfies that WHERE condition, and the first transaction
  74              rereads for the same condition, retrieving the additional
  75              "phantom" row in the second read.
  76      */
  77     const long SERIALIZABLE         =  8;
  78 };
  79
  80 //=============================================================================
  81
  82 }; }; }; };
  83
  84 /*===========================================================================
  85 ===========================================================================*/
  86 #endif
  87
  88 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */