Although every precaution has been taken in the preparation of this document, the publisher and author assume no responsibility for errors or omissions. Essentially, this section is all about replacing the automatic generation of Update, Insert, and Delete commands with calls to stored procedures on the data source.
When the SQL Data Sources dialog vfp sqlexec cursor read write and type displayed, you can choose a data source from the list of data sources and stored connections.
Therefore, no matter what the current value is for UpdateCmd, this method overrides that to always use the stored procedure. Second, because stored procedures are precompiled and cached, they execute faster.
SQLDisconnect Once you have finished with a connection you should close it. Again, there are more than one equally acceptable approaches.
If you don't parameterize your query like the earlier examples through use of the ". While most often applied to a specific column, a rule can be used for several columns. Generally, you will want to leave this setting off so that your code can quietly handle any exceptions that may occur.
This means that you'll be dealing with the UpdateCmd, InsertCmd, and DeleteCmd properties, and assumes that the Northwind database on your SQL Server already has stored procedures in place for performing these functions they are not provided in the sample database. This will direct the CursorAdapter class to automatically build the appropriate Update, Insert or Delete statements for any changes that are made to the data in the cursor.
Native obviously is for DBFs - maybe not so obvious, but get used to native as a term always meaning core internal language and architecture. Note Rules must be bound to the column s before they can be applied.
Since this first example will connect to native VFP tables, choose Native.
The only difference is that you must supply the specific connection handle. You will need this password: The last parameter, lResult, is the most critical for our current topic, as it tells us whether the update was deemed a success by the updating process.
This document complements the redware Visual FoxPro Client-Server Handbook which describes in detail the techniques and optimisations to access client-server databases using all the available features of Visual FoxPro through to version 7.
You'll have to ensure that any CursorAdapter object variables stay within scope for as long as you intend to access the associated cursor. In summary, the simple way to solve this problem is to add the following code to the AfterUpdate method on the CursorAdapter class: This value will be "collapsed" to the single percent sign character before SQL Server receives the query.
To specify how the CursorAdapter will retrieve data from the source, use the Data Access page of the builder. To ensure the changes were applied, call the CursorRefresh method of the CursorAdapter object and browse again. I use the Evaluate function so the cursor name will be dynamic, assuming that the cursor name could easily be changed but the code may not.
I'd go about this and try to extract the real structure of the excel columns and introduce a better conversion to the vfp field types than the excel driver in conjunction with SQLPassthrough is capable.
Start by creating a new program called caADO. Also, let's build this CursorAdapter "from scratch" so that every aspect of the class is visible. Another example might be a situation where the data is currently stored in VFP tables, but future plans are to move to a database server, like SQL Server or Oracle.
The CursorAdapter, as noted earlier, is not a good choice of object for passing data between tiers, as it converts everything into a non-portable VFP cursor.
In either case, these functions should be invoked through the Init method of the CursorAdapter class using the following code: These classes could be reused between applications or mixed within the same application to standardize the way your application handles data.
In this case, use caCustomer as the class name and cCustomer as the alias. If the error encountered is at the environmental level a -2 is returned. CursorAdapters can be created programmatically or using the CursorAdapter builder that forms part of the visual design tools for the DataEnvironment of a Form.
Then, instantiate the deTest class with the NewObject function, just as you did above, and call the OpenTables method. At this point, you should see the caCustomer class listed on the left, and details on the right.
There are several advantages of using CursorAdapter classes: You can use the following to reset all of the global environment settings back to their defaults: Therefore, if you wish to pass the data retrieved by a CursorAdapter as a parameter to another application or process, you'll have to convert the data into something like an XML document or ADO recordset for the data to be properly marshaled to the receiving end.
How to refresh foxpro cursors? Ask Question. up vote 0 down vote favorite. I'm running a select to create cursor read write: update delete If you are using Visual Foxpro and have your tables in a DataBase Container, you could use updatable views to accomplish this. Views are basically the same as a cursor, but after you are done editing.
Visual FoxPro is a discontinued Microsoft data-centric procedural programming language that subsequently became object-oriented. It can be used to write not just traditional "fat client EXIT && To close the connection ENDIF * Retrieve data from the remote server and stores it in a local data cursor nResult = SQLEXEC (nHnd, "SELECT Developer(s): Microsoft.
Read/Write: Asynchronous: Result set returned synchronously or synchronously function to set the properties for a Visual FoxPro cursor (or table). The following table lists each of the function’s properties. Thus, if we use the above example, the first cursor name in the SQLEXEC() sequence would be MT.
Now, if we change the cursor. lcNumConex = 1 pStringSQL = [SELECT * FROM TESTE] pCursor = [tmpResult] SQLEXEC(lcNumConex,pStringSql,pCursor) When I use this, I can see on the cursor created as result from query, the field "cpDATA" as string instead of date type.
Visual FoxPro CursorAdaptor Visual FoxPro Cursor Adaptor. Visual FoxPro Cursor Adaptor An identical procedure is followed for local FoxPro data where the DATASOURCE is blank and the DATASOURCE type is set to 'NATIVE'.
lcTable = HOME()+'samples\northwind\customers' The following example shows a read-only cursor created with SQL pass. Actually, I was getting error, when I first generated cursor with SQLEXEC, then added some records in it, and then later issued SQLEXEC over same cursor (with same alias name) again.
So, I must first USE (close) this cursor, and then call SQLEXEC "over him" again.Vfp sqlexec cursor read write and type