Microsoft KB Archive/174689

= HOWTO: Set a Primary Key to Updateable in a View =

Article ID: 174689

Article Last Modified on 2/16/2005

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APPLIES TO


 * Microsoft Visual FoxPro 5.0 Standard Edition
 * Microsoft Visual FoxPro 5.0a
 * Microsoft Visual FoxPro 6.0 Professional Edition
 * Microsoft Visual FoxPro 3.0b for Macintosh
 * Microsoft Data Access Components 2.5

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This article was previously published under Q174689



SUMMARY
By default, when creating a view on a table, any field with a primary key index is not marked as updateable. This article illustrates how you can mark the primary key as updateable through the View Designer, and programmatically.



View Designer
To mark the primary key as updateable through the View Designer interface, use the following steps:

 Open the view in the View Designer. Click the Update Criteria tab. Click the Update column beside the primary key field.

NOTE: The Update column has a column header that looks like a pencil. If you do not select the Update column and you attempt to INSERT a new record, you may receive one of the following errors:

Connectivity error: [Microsoft][ODBC Visual FoxPro Driver Field does not accept null values.

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Mandatory not null field - missing or null during insert.



Programmatically
To mark the primary key as updateable programmatically, use the following steps:

 Open the Tastrade database in the VFP\Samples\Tastrade\Data folder in Visual FoxPro 5.0, or the home(2)+"Tastrade\Data" folder in Visual FoxPro 6.0.  Run the following program to create a new SQL view based on the Customer table. ***********RunFirst.prg*********** CREATE SQL VIEW MYTEST AS SELECT * FROM CUSTOMER DBSETPROP("MYTEST","VIEW","SENDUPDATES",.T.) ***********End RunFirst.prg*************  Modify the view in the View Designer and note that the primary key is not marked for updates.</li>  Create a program called MarkPrimary and place the following code in it: ************MarkPrimary.prg**************** PARAMETERS ViewName

x=ALIAS USE IN 0 &viewname PrimKeys = CURSORGETPROP('KeyFieldList',viewname) i=1 remField=PrimKeys DO WHILE i <> 0 nextcomma=AT(remField,",") IF nextcomma=0 and len(remfield)=0 THEN i=0 EXIT ELSE IF nextcomma=0 and LEN(remfield)<>0 then tmpfield=remfield y= DBSETPROP(ViewName + "." + ;              tmpField,'Field','UPDATABLE',.T.) i=0 EXIT ELSE tmpField=SUBSTR(remField,i,NextComma -1) remfield=SUBSTR(remfield,nextcomma + 1) i=nextcomma y= DBSETPROP(ViewName + "." + ;              tmpField,'Field','UPDATABLE',.T.) ENDIF ENDIF ENDDO

SELECT (viewname) USE IF NOT EMPTY(x) THEN SELECT (x) ENDIF **************End MarkPrimary.prg******************* </li>  Run the MarkPrimary.prg code by typing the following into the Command window: DO MARKPRIMARY WITH "MYTEST" </li> Modify the view MyTest in the View Designer and notice that the primary key field is now marked for updates.</li></ol>

Keywords: kbhowto kbdatabase kbcode KB174689

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