The functionality of updatable resultsets in a server environment are similar
to an embedded environment in ,
with the exception of the following differences:
- The Network Client requires that there be at least one column in the select
list from the target table. For example, the following statement will fail
in a server environment:select 1, 2 from t1 for update of c11The
Network Client driver looks at both of the columns in the select list and
cannot determine the target table for update/delete by looking at the column
metadata. This requirement is not necessary in an embedded environment.
- The embedded driver allows for statement name changes when there is an
open resultset on the statement object. This is not supported in a server
environment.
Other differences between updatable resultsets in a server or embedded
environment can be found in the following table.Comparison of
updatable resultsets features in server and embedded environments
Embedded environment
Server environment
updateString on SMALLINT, INTEGER, BIGINT, DECIMAL datatypes
supported.
Not supported
updateBytes on CHAR, VARCHAR, LONG VARCHAR datatypes
supported.
Not supported
updateTime on TIMESTAMP datatypes supported.
Not supported
updateObject with null values supported.
Not supported
updateClob and updateBlob supported.
Not supported