Cursor ref for update

The engine validates the size of the buffers prior to accessing them. If the size of the buffer is larger than the size required to fully define a row then the extra bytes will be ignored and no status will be returned. Locking Requirements Write lock on the table associated with the cursor. A foreign key also require read lock on the referenced table. If the size of the buffer is larger than the size required for the specified type then the extra bytes will be ignored and no status will be returned.

This function updates all column values, except for blobs, in current row of cursor. Foreign keys also require read locks on the referenced tables. The database definition does not match what is expected for this application. If the table definition has changed since the schema was first compiled a new header file will need to be generated. Set the size of a blob column. The following includes some dataset types that can only be edited within an edit session: Feature classes participating in a topology Feature classes participating in a geometric network Feature classes participating in a network dataset Versioned datasets in enterprise geodatabases Some object and feature classes with class extensions In Python 2, UpdateCursor supports the iterator next method to retrieve the next row outside of a loop.

Note: Using an UpdateCursor on a layer with a joined table is not supported. It provides a portable representation of a geometry value as a contiguous stream of bytes. Values are returned as a bytearray object, but can be updated as a bytearray or bytes object. It provides a portable representation of a geometry value as a text string. Methods deleteRow. Parameter Explanation Data Type row.

Code sample UpdateCursor example 1 Use UpdateCursor to update a field value by evaluating the values of other fields. UpdateCursor fc, fields as cursor: Update the field used in Buffer so the distance is based on road type. Road type is either 1, 2, 3, or 4. Distance is in meters. The feature class, layer, table, or table view. Raster fields are not supported. The default value is None.

First thing was the "I think you should probably do it a better way", but to answer the question also include the actual answer too.

This answer basically taught me several new tricks in one go. Another option could be to use a temporary table. Code Code 4 4 silver badges 9 9 bronze badges. Toshihiko Toshihiko 1 1 gold badge 8 8 silver badges 19 19 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. I was very confused till now. Thanks Tom,Absoloutely wonderful!! Nice difference Gaurav C. Pandey, May 14, - am UTC. Now i am able to distingiush between Ref. Absolutely Wonderful!! Really happy to get such concepts cleared. Hi Tom, Most useful, but I need one clarificaiton though.

ASP vbscript will loop through recordset for display. In this case there is no need to use Ref Cursor to pass data to client.

Please comment. April 06, - am UTC. You will be using a ref cursor to return a result set to vb. Ram, April 06, - am UTC. April 07, - pm UTC. In Oracle - the ref cursor is the way to do it. Hi Tom, Understood Sir.. I am getting ready for myself, since there is a possibility to migrate to Oracle. Thanks Regards, Ram.

Hi Tom, Super explanation. I also thank Praveen who started this. Clear simple explanation kannan, May 18, - am UTC. Thanks for the simple and clear explanation of the differences between Cursors and Ref Cursors.

I really enjoyed it. I am clear with ref cursor no, that was great. I understand the use of it when i am calling any function through front end VB etc But in my project, i am calling functions through UNIX only. Thanks in advance. May 25, - pm UTC. Tom, How does Cursors and bulk collect differ?

Which one is better and why? Hope my question makes sense.. I am just trying to understand the fundamental concepts [:- ] after working in Oracle for many years.. This difference is really very helpful for developers. Thanks, Chandra. Tom, Unfortunately, I do not have access to that book right away. But I promise I'm going to buy after these holidays ;- Thanks,.