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Eloquence B.07.10 contact contact


DBEND

 
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  Designates the end of a sequence of database procedure calls regarded as a static or multiple database transaction (based on the mode) for the purposes of logging and recovery. The text parameter can be used to log user information to the log file. DBEND isused in conjunction with DBBEGIN to begin and end a static or multiple database transaction.

Static transactions are currently not supported with Eloquence and DBEND has no effect. Eloquence relies on dynamic transactions internally. A future version of Eloquence may add support for static transactions for use with forward recovery or auditing purposes.

DBEND(base|baseidlist|transid ,text,mode,status,textlen)
base
is the name of the array used as the base parameter when opening the database. The first element of the array must contain the base ID returned by DBOPEN. (Refer to DBOPEN for more information about the base ID.) Use with DBEND mode 1 or 2.

The base argument is ignored with Eloquence.

baseidlist
is the name of an integer array containing the list of base IDs which are involved in a multiple database transaction. Use with DBEND mode 3 or 4, and set the first two halfwords to binary zeros. The layout of this array is shown here (each element is a halfword, or two bytes):

Element Contents
1-2 Must be set to binary zeros.
3 The number of base IDs involved in the multiple database transaction. This must be a number between 1 and 15, inclusive.
4-n Base IDs of the databases involved in the transaction. Base ID is the first halfword of the base parameter used to call database procedures.

The baselist argument is ignored with Eloquence.

transid
is the name of the integer array containing the two-halfword transaction ID. The transaction ID was returned by DBBEGIN mode 3 or 4. Use with DBEND mode 3 or 4, and do not set the first two halfwords to binary zeros.

The transid argument is ignored with Eloquence.

text
is the name of an array up to 256 halfwords long that contains user ASCII or binary data to be written to the log file as part of the transaction log.

mode
must be an integer equal to 1, 2, 3 or 4.

  • Mode 1: End of static transaction.
  • Mode 2: Write contents of the logging buffer in memory to disk, and end the static transaction.
  • Mode 3: End of multiple database transaction. If user logging is enabled for the databases, mode 3 generates multiple entries in the log file in order to mark multiple database transactions.
  • Mode 4: Write contents of the logging buffer in memory to disk, and end the multiple database transaction. If user logging is enabled for the databases, mode 4 generates one entry in the log file in order to mark multiple database transactions.

The mode parameter has no effect with Eloquence.

status
is the name of an array of 10 halfwords in which the database returns status information about the procedure. If the procedure executes successfully, the status array contents are:

Element Contents
1 If the procedure succeeds, the return status is 0. Otherwise it provides a status code to describe the failure.
2-4 Unchanged.
5-10 Information about the current procedure call and its results.

textlen
is an integer equal to the number of halfwords to be logged from the text parameter, or is a negative integer equal to the number of bytes. Length can be zero.


Notes:

  • Static transactions are not supported and DBEND has no effect besides verifying the arguments.


 
 
 
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