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You should use batch updating with either a keyset or static cursor only.If the attempt to transmit changes fails for any or all records because of a conflict with the underlying data (for example, a record has already been deleted by another user), the provider returns warnings to the Errors collection and a run-time error occurs.For example, should the insert of a row into the previous join result in a new product and also a new supplier, or just a new product?The Client Data Set/Provider architecture allows you to specify a primary update table (and advanced features actually not covered in the book) and also customize the updates' SQL, as we partially saw in Chapter 14 and we'll further explore in Chapter 16, "Multitier Data Snap Applications." ADO supports an equivalent to cached updates called batch updates, which are similar to the BDE approach. Open "select * from my_ado", conn, ad Open Dynamic, ad Lock Optimistic rs.
In the first line of code, an instance of a Sql Connection is created.In the next section we will take a closer look at ADO's batch updates, what they can offer you, and why they are so important.However, in this section you won't need them to solve the problem of updating a join, because in ADO, joins are naturally updatable.If the Unique Table and Update Resync dynamic properties are set, and the Recordset is the result of executing a JOIN operation on multiple tables, then the execution of the Update Batch method is implicitly followed by the Resync method, depending on the settings of the Update Resync property.The order in which the individual updates of a batch are performed on the data source is not necessarily the same as the order in which they were performed on the local Recordset. Take this into account when coding updates that are related to one another, such as foreign key constraints on an insert or update.