In the following table, the description provides the SQL data type. If you are writing your script in Java or .NET, you should use the appropriate corresponding data type. See SQL-Java data types and SQL-.NET data types.

In SQL scripts, you can specify event parameters by name or with a question mark. Using question marks has been deprecated and it is recommended that you use named parameters. You cannot mix names and question marks within a script. If you use question marks, the parameters must be in the order shown below and are optional only if no subsequent parameters are specified (for example, you must use parameter 1 if you want to use parameter 2). If you use named parameters, you can specify any subset of the parameters in any order.

None.

The MobiLink server opens a read-only cursor to fetch a list of rows to download, and then delete from the remote database. This script must contain a SELECT statement that returns the primary key values of the rows to be deleted from the table in the remote database.

You can have one download_delete_cursor script for each table in the remote database.

If the download_delete_cursor has nulls for the primary key columns for one or more rows in a table, then MobiLink tells the remote to delete all the rows in the table. See Deleting all the rows in a table.

Note that rows deleted from the consolidated database can not appear in a result set defined by a download_delete_cursor event, and so are not automatically deleted from the remote database. One technique for identifying rows to be deleted from remote databases is to add a column to the consolidated database table identifying a row as inactive.

To avoid downloading unnecessary rows to delete, consider using timestamp-based downloads. Include a line similar to the following in the WHERE clause of your download_delete_cursor script:

AND last_modified >= {ml s.last_table_download}

This script must be implemented in SQL. For Java or .NET processing of rows, see Direct row handling.

It can be problematic using READPAST table hints in a download_delete_cursor. For details, see the download_cursor event.

• Data scripts
• Script parameters
• Adding and deleting scripts
• download_cursor table event
• Writing scripts to download rows
• Partitioning rows among remote databases
• Writing download_delete_cursor scripts
• Using remote IDs and MobiLink user names in scripts
• Using last download times in scripts
• "Using READPAST with MobiLink synchronization" in FROM clause

This example is taken from the Contact sample and can be found in Samples\MobiLink\Contact\build_consol.sql. It deletes from the remote database any customers who have been changed since the last time this user downloaded data (Customer.last_modified >= {ml s.last_table_download}), and either