Library: Database access (OMDB legacy) Include: omdb.xin

Return type: String source Returns: Requested field data as a source.

Declaration

define external string source function dbFieldValue
       value dbField  field
  null value string   null     optional

Argument definitions

field

is a dbField object associated with a field in the current record in an active SQL query record set.

null

is an optional string that will be returned instead of a zero-length string when the field value is NULL.

The dbFieldValue function returns the requested field data as an OmniMark source.

Requirements

You must include the following line at the beginning of your OmniMark program:

  include "omdb.xin"

The database connection represented by dbDatabase must be:

• open (else external exception OMDB209)
• in scope (else external exception OMDB103)

The dbField object field must be associated with a query (else external exception OMDB302).

The data cursor must be positioned on an existing row (else external exception OMDB205).

Usage Notes

To avoid external exception OMDB205, use the dbRecordExists function to verify that the row exists prior to retrieving a field value.

If the record has a date, time, or timestamp field, the field's value will be formatted in the OmniMark Date and Time library format. (This format returns the time with a time zone offset from UTC time, which most databases do not provide.)

If the field value is NULL, this function returns either an empty string or a string you specify for null within the function call.

Example

        repeat
           exit unless dbRecordExists my-query
  
           repeat over my-query
              output dbFieldValue my-query
                 null '-DNF-'
              output '%t' when ! #last
           again
           output '%n'
  
           dbRecordMove my-query
         again

Other Library Functions dbClose dbCommit dbDatabase dbExecute dbField dbFieldPrepare dbFieldSink dbFieldValue dbIsVersionCompatible dbLibraryVersion dbLibraryVersionOCI8 dbLibraryVersionOCI8i dbLibraryVersionODBC dbOpenOCI8 dbOpenOCI8i dbOpenODBC dbProcedure dbProcedureClose dbProcedureExecute dbProcedureOpen dbQuery dbRecordExists dbRecordMove dbRecordMoveDynamic dbRecordSetMove dbRollback dbSetTransactionType dbStatement dbStatementCompile dbStatementDiscard dbStatementExecute dbStatementStreamingExecute dbTable dbTableClose dbTableDelete dbTableInsert dbTableOpen dbTableUpdate

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