Lookup Function |  |
-- todo --
Searches a table for the first record with a field matching the specified expression.
Namespace: XSharp.VFP
Assembly: XSharp.VFP (in XSharp.VFP.dll) Version: 2.19
SyntaxFUNCTION Lookup( ReturnField, eSearchExpression, SearchedField, cTagName ) AS USUAL CLIPPER
Parameters
- ReturnField (Optional)
- Type: Usual
- eSearchExpression (Optional)
- Type: Usual
- SearchedField (Optional)
- Type: Usual
- cTagName (Optional)
- Type: Usual
Return Value
Type: UsualCharacter, Numeric, Currency, Float, Integer, Double, Date, DateTime, or Logical.
Remarks
If the search is successful, LOOKUP( ) moves the record pointer to the matching record and
returns the contents of a specified field in the record.
If LOOKUP( ) does not find the search expression, it returns a blank value the same length and data type as ReturnField. The record pointer is positioned at the end of the file.
If you use LOOKUP( ) to search a parent table, record pointers in all related child tables are moved to the related records.
This function cannot be optimized with Rushmore Query Optimization.
If LOOKUP( ) does not find the search expression, it returns a blank value the same length and data type as ReturnField. The record pointer is positioned at the end of the file.
If you use LOOKUP( ) to search a parent table, record pointers in all related child tables are moved to the related records.
This function cannot be optimized with Rushmore Query Optimization.
ExamplesX#
1Close Databases 2Open Database (HOME(2) + 'data\testdata') 3Use customer Order company // Open Customer table 4Clear 5@ 2,2 SAY LOOKUP(contact, 'Ernst Handel', company, 'company')
See Also