4D v13.4

Get last field number

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4D v13.4
Get last field number

Get last field number 


 

Get last field number ( tableNum | tablePtr ) -> Function result 
Parameter Type   Description
tableNum | tablePtr  Longint, Pointer in Table number or Pointer to table
Function result  Longint in Highest field number in table

The Get last field number command returns the highest field number among the fields in the table whose number or pointer you pass in tableNum or tablePtr.

Fields are numbered in the order in which they are created. If no field has been deleted from the table, then this command returns the number of fields that the table contains. In the case of iterative loops on the field numbers of the table, you must use the Is field number valid command in order to check whether the field has been deleted.

Example  

The following project method builds the array asFields, consisting of the field names, for the table whose pointer is received as first parameter:

 $vlTable:=Table($1)
 ARRAY STRING(31;asFields;Get last field number($vlTable))
 For($vlField;Size of array(asFields);1;-1)
    If(Is field number valid($vlTable;$vlField))
       asFields{$vlField}:=Field name($vlTable;$vlField)
    Else
       DELETE FROM ARRAY(asFields;$vlField)
    End if
 End for

 
PROPERTIES 

Product: 4D
Theme: Structure Access
Number: 255

 
INDEX

Alphabetical list of commands

 
HISTORY 

Modified: 4D v11 SQL

 
SEE ALSO 

Field name
GET FIELD PROPERTIES
Get last table number
Is field number valid