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

Declaration

define external function dbTableDelete
       value    dbTable  table
 where value    stream   condition

Argument definitions

table

is an open dbTable object.

condition

is a condition to limit the number of rows deleted.

Use dbTableDelete to delete records from a table using the supplied criteria.

Requirements

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

  include "omdb.xin"

The condition must be

• valid SQL (else external exception OMDB501) or
• the specially defined constant DB_ALL_RECORDS (all records in the table will be removed).

Usage Notes

None.

Example

The following example uses dbTableDelete to remove grade references for students who did not finish a course. The deletion is performed through the dbTable OMX component.

  
  process
  
      ;  local variables
      local dbDatabase this-db
      local dbTable student-course
      ;  create the database OMX objects
      set this-db to dbOpenODBC 'dbDemo'
      set student-course to dbTableOpen this-db table 'StudentCourse'
  
      ;  drop students who did not finish from course lists
      dbTableDelete student-course where "Grade is NULL"
  
      ;  catch the database exceptions
      catch #external-exception identity catch-id message catch-msg
          output 'An error occurred while accessing an omDB function.%n'
          output '%g(catch-id)  :  %g(catch-msg)%n'

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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