Compiles a predicate (query condition).
Return type: LOGICAL
Applies to: Query object handle
The QUERY-PREPARE method corresponds to the OPEN QUERY statement's compilation phase. To open the query object, use the QUERY-OPEN method.
If the QUERY-PREPARE method encounters an error, it returns FALSE and generates an error message, but does not raise ERROR. If you use the QUERY-PREPARE method in a statement that uses the NO-ERROR option and an error occurs, the QUERY-PREPARE method returns FALSE and diverts the error to the ERROR-STATUS system handle. In either instance, ERROR-STATUS:ERROR returns FALSE. You can get information on the error through the GET-MESSAGE method of the ERROR-STATUS system handle, as usual.
The following are examples:
Unless explicitly specified otherwise in the predicate-expression, the default record lock type for the QUERY-PREPARE method is NO-LOCK.
Like the FOR statement, the QUERY-PREPARE method predicate-expression supports the BREAK and BY options for sorting and accumulating data by break groups.
hQuery:QUERY-PREPARE("FOR EACH Customer WHERE Customer.CustNum > 50 BREAK BY Customer.SalesRep BY Customer.Country").
The QUOTER function can be used to wrap character values with internal quotes, as in this example: