CURRENT-VALUE function

Returns the current INT64 value of a sequence defined in the Data Dictionary.

Syntax


`CURRENT-VALUE ( sequence [ , logical-dbname ] [ , tenant-id ] )`

sequence

An identifier that specifies the name of a sequence defined in the Data Dictionary.

logical-dbname

An identifier that specifies the logical name of the database in which the sequence is defined. The database must be connected. You can omit this parameter if the sequence name is unambiguous. If a sequence with this name exists in more than one connected database, then you must specify logical-dbname.

tenant-id

An integer expression that evaluates to the tenant ID of a regular tenant, including the default tenant (0). This option applies only to a multi-tenant sequence specified by sequence and is intended for access primarily by a super-tenant user.

If you are a regular-tenant user and you specify tenant-id, the specified tenant must be the same as the tenant associated with the database connection identity for logical-dbname or the AVM raises a run-time error.

If you are a super-tenant user and you do not specify tenant-id, the function assumes the effective tenant ID (GET-EFFECTIVE-TENANT-ID function).

If the sequence specified by sequence is non-multi-tenant (a shared sequence in a multi-tenant database), and you specify tenant-id, the option is ignored.

Example

The following example finds the current value of the NextCustNum sequence and then looks for Orders with that Customer number:

r-curval.p

DEFINE VARIABLE cur-cust NO-UNDO LIKE Customer.CustNum. cur-cust = CURRENT-VALUE(NextCustNum). IF CAN-FIND(FIRST Order WHERE Order.CustNum = cur-cust) THEN FOR EACH Order NO-LOCK WHERE Order.CustNum = cur-cust, EACH OrderLine OF Order NO-LOCK BREAK BY Order.OrderNum: IF FIRST-OF(Order.OrderNum) THEN DISPLAY Order.OrderNum Order.OrderDate Order.CustNum WITH FRAME order-info CENTERED ROW 2 1 COL. DISPLAY OrderLine. END. ELSE DO: FIND FIRST Customer WHERE Customer.CustNum = cur-cust NO-LOCK NO-ERROR. IF AVAILABLE Customer THEN MESSAGE "No Orders Exist for Customer " + Customer.Name + ", " + STRING(Customer.CustNum) VIEW-AS ALERT-BOX INFORMATION BUTTONS OK TITLE "No Orders". ELSE MESSAGE "Customer number" cur-cust "does not exist." VIEW-AS ALERT-BOX INFORMATION BUTTONS OK TITLE "No Customer". END.

DEFINE VARIABLE cur-cust NO-UNDO LIKE Customer.CustNum.

cur-cust = CURRENT-VALUE(NextCustNum).
IF CAN-FIND(FIRST Order WHERE Order.CustNum = cur-cust) THEN
FOR EACH Order NO-LOCK WHERE Order.CustNum = cur-cust, 
  EACH OrderLine OF Order NO-LOCK
  BREAK BY Order.OrderNum:

  IF FIRST-OF(Order.OrderNum) THEN
    DISPLAY Order.OrderNum Order.OrderDate Order.CustNum
      WITH FRAME order-info CENTERED ROW 2 1 COL.
   
  DISPLAY OrderLine.
END.
ELSE DO:
  FIND FIRST Customer WHERE Customer.CustNum = cur-cust NO-LOCK NO-ERROR.
  IF AVAILABLE Customer THEN
    MESSAGE "No Orders Exist for Customer " + Customer.Name +
      ", " + STRING(Customer.CustNum)
      VIEW-AS ALERT-BOX INFORMATION BUTTONS OK TITLE "No Orders".
  ELSE 
  MESSAGE "Customer number" cur-cust "does not exist."
    VIEW-AS ALERT-BOX INFORMATION BUTTONS OK TITLE "No Customer".
END.

Notes

The current value of a sequence can be one of the following:
- The initial value specified in the Data Dictionary
- The last value set with either the CURRENT-VALUE statement or the NEXT-VALUE function
- The Unknown value (?) if the sequence has exceeded its minimum or maximum and is not cycling
If sequence is a multi-tenant sequence in the database, each regular tenant has their own current value of the sequence. So, the same values are returned for each tenant that invokes this function. If the sequence is shared in a multi-tenant database, the values returned by this function are unique across all tenants in the database.
CAUTION: Be very careful using multi-tenant sequences when you are updating shared tables or multi-tenant tables for a tenant group. For more information, see the sections on using multi-tenant-enabled sequences in OpenEdge Programming Interfaces.
Sequence values are stored in the database in which they are defined, and persist between each invocation of the CURRENT-VALUE statement or NEXT-VALUE function.
You cannot invoke the CURRENT-VALUE function from within a WHERE clause. Doing so generates a compiler error. To use a result from the CURRENT-VALUE function in a WHERE clause, assign the result to a variable, then use the variable in the WHERE clause.
You can use any combination of the NEXT-VALUE function, CURRENT-VALUE function, CURRENT-VALUE statement, and their dynamic versions. Use the dynamic version when you don't know what the database name or sequence name is at compile time.
Be careful when accessing a database sequence with an alias that points to a different database than the one used when the alias was defined. If you supply an alias name to the CURRENT-VALUE function or the NEXT-VALUE function, only the database used to define the alias is referenced. In this case, it is preferable to use the DYNAMIC-CURRENT-VALUE function and DYNAMIC-NEXT-VALUE function instead of the CURRENT-VALUE function and NEXT-VALUE function, respectively.

ABL Reference