Each MobiLink remote database can synchronize a subset of the data in the consolidated database. You can customize the download subset for each table.
The download subset options are:
User Choose this option to partition data by MobiLink user name, which downloads different data to different registered MobiLink users.
To use this option, the MobiLink user names must be in your consolidated database. You choose your MobiLink user names when you deploy, so you can choose names that match existing values on your consolidated database. (The column you use for MobiLink user names must be of a type that can hold the values you are using for the user name.) If the MobiLink user names are in a different table from the one you are subsetting, you must join to that table.
Remote ID Choose this option to partition data by remote ID, which downloads different data to different remote databases.
To use this option, the remote IDs must be in your consolidated database. Remote IDs are created as GUIDs by default, but you can set the remote IDs to match existing values on your consolidated database. (The column you use for remote IDs must be of a type that can hold the values you are using for the remote IDs.) If the remote IDs are in a different table from the one you are subsetting, you must join to that table.
It is usually better to partition by user or by authentication parameter than by remote ID, because the remote ID can change if the remote computer is reset or replaced.
Custom Choose this option to use a SQL expression that determines which rows are downloaded. Each synchronization only downloads rows where your SQL expression is true. This SQL expression is added to the WHERE clause of the generated download_cursor script. It is partly generated for you. You can use MobiLink named parameters in the expression. You can also refer to other tables. If you refer to other tables, you must list the other tables in the field above the expression, and include the join condition in your expression.
In the left pane of Sybase Central, expand MobiLink 12, your MobiLink project name, Synchronization Models, and then select your synchronization model name.
Open the Mappings tab in the right pane.
In the Table Mappings pane, select a remote table.
In the Download Subset dropdown list, choose one of the following download subsets: None, User, Remote, or Custom.
If you chose User, Remote, or Custom, open the Download Subset tab in the lower pane.
If you chose User or Remote, the Download Subset tab allows you to identify the column that contains the MobiLink user names or remote IDs, either in the synchronized table or in a joined table. With a joined table, you must specify the columns for the join condition.
If you choose Custom, the Download Subset tab has two text boxes where you add information to construct a download_cursor script. You do not have to write a complete download_cursor. You only need to add extra information to identify the join and other restrictions on the download subset.
In the first text box (Tables To Add To The Download Cursor's FROM Clause), enter the table name(s) if your download_cursor requires a join to other tables. If the join requires multiple tables, separate them with commas.
In the second box (SQL Expression To Use In The Download Cursor's WHERE Clause), enter a SQL expression to be added to the generated WHERE clause that specifies the download subset condition and join condition. You can use MobiLink named parameters, including authentication parameters, in the expression.
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