Synchronization parameters restrict the rows that are transferred from the SAP Mobile Server cache database (CDB) to the device to match values the client provides.
- A synchronization parameter does not affect enterprise information system (EIS) interaction with the CDB, unless you specify the synchronization parameter setting for a given load argument.
- An Online cache
group policy, typically used with Hybrid Apps,
does not support synchronization parameters.
- After you bind a mobile business object (MBO) to a datasource, MBO attributes
map to datasource fields (for example, database columns). You control the amount of
data synchronized (filtered) between the CDB and device application by defining
synchronization parameters that map to attributes. For example, mapping a
synchronization parameter to the "state" attribute, returns customer records for a
particular state based on the value entered by the device application user.
- Another example is an MBO named "sales_order" with a synchronization parameter
mapped to the "region" attribute. Executing the query select * from
sales_order from the device application returns a complete copy of
all sales orders in the CDB. If the application user provides a region when
synchronizing, for example select * from sales_order where
region=Eastern, the client sees sales orders only for the Eastern
region.
- Using a synchronization parameter to filter results may be particularly useful for
MBOs that have large amounts of data that do not change frequently, making periodic
bulk loads and a longer cache interval more appropriate. For example, use
select * from customer to bulk-load all customers. Then
design a synchronization parameter that maps to the "state" attribute. To load only
California customers, the device application user passes in the "CA" parameter.