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

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