primary key on DBF to get C# app to work

Posted on 2007-04-06
Last Modified: 2008-01-09
I am tring to update a dbf file with C# in Visual Studio 2003.  I am getting an error on update and delete:
not supported against a SelectCommand that does not return any key column information

In researching this, I have read that it is because my dbf table does not have a primary key.  How do I set up a primary key on a dbf?  I have Visual FoxPro 6.0, but am not fluent in it AT ALL.  I usually work with Access, which is very different than FoxPro.  

I have included code below, just in case it helps:

            private void DBFtoMDB(string mdbName, string dbfName)
                      tempSyncSltCmd.CommandText = "SELECT * FROM " + dbfName;
                  tempSyncSltCmd.Connection = tempSyncConn;
                  tempSyncAdapt.SelectCommand = tempSyncSltCmd;
                  tempCB = new System.Data.OleDb.OleDbCommandBuilder(tempSyncAdapt);

                  DataSet dsDBF = new DataSet();
                  tempSyncAdapt.TableMappings.Add("Table", dbfName);
                  tempSyncAdapt.Fill(dsDBF, dbfName);


                 tempSyncAdapt.Update(dsDBF, dbfName);
            } //End of DBFtoMDB

Question by:absolutesolutions
LVL 33

Expert Comment

ID: 18868594
You should be somewhat familiar with some SQL stuff and use of the ALTER TABLE command.


Accepted Solution

suhashegde earned 250 total points
ID: 18871674
It is possible to update and delete w/o the primary key because Foxpro has a physical Record number.
i.e. the records are numbered 1 to .... as based on row.

SO you will have to manually create a deletecommand and a updatecommand
ex : (Dont use Order by Cluse as it might give unexpeted results) TRY this code and modify to suite your needs

 private void DBFtoMDB(string mdbName, string dbfName)
                  int recno = 2 ;//base 1 in foxpro not 0 as in C# so second record will be marked as deleted
                      tempSyncSltCmd.CommandText = "SELECT * FROM " + dbfName;
                  tempSyncSltCmd.Connection = tempSyncConn;
                  tempSyncAdapt.SelectCommand = tempSyncSltCmd;
                 // tempCB = new System.Data.OleDb.OleDbCommandBuilder(tempSyncAdapt);
                  DataSet dsDBF = new DataSet();
                  tempSyncAdapt.TableMappings.Add("Table", dbfName);
                  tempSyncAdapt.Fill(dsDBF, dbfName);
                  tempSyncAdapt.DeleteComand.CommandText = @"Delete from "+dbfName+" where Recno() = "+ recno;
// now send the execute the command

                 tempSyncAdapt.Update(dsDBF, dbfName);
            } //End of DBFtoMDB

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