You receive a connection busy error message when you try to open a remote view to SQL Server tables

This article was previously published under Q217082
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SYMPTOMS
When you try to open a remote view by using a shared connection to access Microsoft SQL Server tables in Microsoft Visual FoxPro 7.0 and earlier versions, you may receive the following error message:
Connection "connection name" is busy .
RESOLUTION
Set the FETCHSIZE property of remote views using shared connections to a value of -1.
OPEN DATABASE MYDATA=DBSETPROP('MyView','View','FetchSize',-1)				
-or-
OPEN DATABASE MYDATAUSE MyView IN 0SELECT MyView=CURSORSETPROP('FetchSize',-1)				
Setting the FetchSize Property of the remote view to -1 causes Visual FoxPro to retrieve the complete result set (within the limits set by the MaxRecords setting).
MORE INFORMATION
The default FetchSize Property value for remote views is 100.

The error message indicates that the shared remote connection is in use by another executing statement. This behavior occurs when multiple remote views have been defined with the following characteristics:

  • Using a shared remote connection to the server.
  • Accessing the same base table(s).
  • The number of records being returned is greater than or equal to the FETCHSIZE property of the view.





Steps to Reproduce Behavior

  1. From the Windows Control Panel, open ODBC Data Source Administrator, and add a DSN named MyDSN, using the SQL Server ODBC Driver.
  2. Create a program file named "REMOVIEW.PRG" using the following code: (NOTE: This program will create a new SQL Server table in the database that the DSN specifies as the default, and necessitates appropriate permissions.)
    lcsafestat=SET('SAFETY')lcexclstat=SET('EXCLUSIVE')lcMultiLocks=SET('MULTILOCKS')SET SAFETY OFFSET EXCLUSIVE ONSET MULTILOCKS ONgnConnHandle=SQLCONNECT('MyDSN','sa','')lnCreate=0lnUseDB=0IF gnConnHandle > 0   * Use the SQL Server PUBS database   SQLCommand="USE PUBS"   lnUseDB=sqlexec(gnConnHandle,SQLCommand)   IF lnUseDB > 0      * Create table TEST_A in the PUBS database      SQLCommand="CREATE TABLE TEST_A (VAR1 CHAR(10) NULL, " + ;         "VAR2 VARCHAR(20) NULL)"      lnCreate=sqlexec(gnConnHandle,SQLCommand)   ENDIF   * Disconnect from SQL Server   =sqldisconn(gnConnHandle)ENDIFIF lnCreate > 0   * Create a Visual FoxPro database named TESTA   CREATE DATABASE testa   * Create a remote connection to SQL Server   CREATE CONNECTION test1 DATASOURCE 'MyDSN' USERID 'SA' PASSWORD '' ;      DATABASE 'PUBS'   * Create three remote views to SQL Server   IF lnUseDB > 0      CREATE SQL VIEW testa REMOTE CONNECTION test1 SHARE ;         AS SELECT * FROM dbo.test_a test_a      CREATE SQL VIEW testb REMOTE CONNECTION test1 SHARE ;         AS SELECT * FROM dbo.test_a test_a      CREATE SQL VIEW testc REMOTE CONNECTION test1 SHARE ;         AS SELECT * FROM dbo.test_a test_a   ENDIF   * Set Properties for the three remote views   FOR i=1 TO 3      ViewName="TEST"+CHR(64+i)      =DBSETPROP(ViewName,'View','UpdateType',1)      =DBSETPROP(ViewName,'View','WhereType',3)      =DBSETPROP(ViewName,'View','UseMemoSize',255)      =DBSETPROP(ViewName,'View','FetchSize',100)      =DBSETPROP(ViewName,'View','MaxRecords',-1)      =DBSETPROP(ViewName,'View','Tables','dbo.test_a')      =DBSETPROP(ViewName,'View','Prepared',.T.)      =DBSETPROP(ViewName,'View','FetchMemo',.T.)      =DBSETPROP(ViewName,'View','SendUpdates',.T.)      =DBSETPROP(ViewName,'View','BatchUpdateCount',1)      =DBSETPROP(ViewName,'View','CompareMemo',.T.)      =DBSETPROP(ViewName,'View','FetchAsNeeded',.F.)      =DBSETPROP(ViewName,'View','ShareConnection',.T.)   NEXT   USE testa   testb=AFIELDS(viewflds)   FOR i=1 TO ALEN(viewflds,1)      fld_name=viewflds[i,1]      viewfield='TESTA'+"."+ALLTRIM(fld_name)      IF i=1         =DBSETPROP(viewfield,'Field','KeyField',.T.)      ELSE         =DBSETPROP(viewfield,'Field','KeyField',.F.)      ENDIF      =DBSETPROP(viewfield,'Field','Updatable',.T.)      =DBSETPROP(viewfield,'Field','UpdateName',"dbo.test_a" + ;         "."+ALLTRIM(fld_name))   NEXT   * Insert 100 records into the base table via remote view TESTA   FOR j=1 TO 100      INSERT INTO testa VALUES ;          (REPLICATE('0',6)+ALLTRIM(STR(j)),TTOC(DATETIME()+j))   NEXT   =TABLEUPDATE(.T.)   SELECT testa   USE testb IN 0   * Get a Connection 'TEST1' is Busy message on next line   * Select Ignore.   USE testc IN 0   CLOSE ALL   gnConnHandle=SQLCONNECT('MyDSN','sa','')   lnUseDB=0   IF gnConnHandle > 0      * Use the SQL Server PUBS database      SQLCommand="USE PUBS"      lnUseDB=sqlexec(gnConnHandle,SQLCommand)      IF lnUseDB > 0         * Drop Table TEST_A from the PUBS database         SQLCommand="DROP TABLE TEST_A"         =sqlexec(gnConnHandle,SQLCommand)      ENDIF      =sqldisconn(gnConnHandle)   ENDIFELSE   =MESSAGEBOX('Unable to Create SQL Server Table',16)ENDIFSET SAFETY &lcsafestatSET EXCLUSIVE &lcexclstatSET MULTILOCKS &lcMultiLocksRETURN						
  3. From the Command window, type "DO REMOVIEW," and observe that the program runs with no error messages.
  4. From the Command window, type "DO REMOVIEW," and observe that an error occurs when the program attempts to open the view named TESTC.
  5. When the error message appears, select the Ignore option.
  6. Change the following line of code:
    =DBSETPROP(ViewName,'View','FetchSize',100)						
    to read as follows:
    =DBSETPROP(ViewName,'View','FetchSize',-1)					
  7. From the Command window, type "DO REMOVIEW," and observe that the program runs with no error messages.
REFERENCES
For additional information about Remote Views, please see the following articles in the Microsoft Knowledge Base:

137944 How to Create a Remote Connection or View Programmatically

174807 HOWTO: Edit the SQL Statement of a Remote or Local View

191343 PRB: Connection Busy Error with a Shared Connection

191344 PRB: Base Table Fields Changed with Remote View

(c) Microsoft Corporation 1999, All Rights Reserved. Contributions by John Desch, Microsoft Corporation.

KBDSE
Properties

Article ID: 217082 - Last Review: 02/21/2014 00:33:45 - Revision: 3.1

  • Microsoft Visual FoxPro 3.0 Standard Edition
  • Microsoft Visual FoxPro 3.0b Standard Edition
  • Microsoft Visual FoxPro 5.0 Standard Edition
  • Microsoft Visual FoxPro 6.0 Professional Edition
  • Microsoft Visual FoxPro 7.0 Professional Edition
  • kbnosurvey kbarchive kbprb kbsqlprog KB217082
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