As a "special register" value, the client user identifier should be usable in the same manner as the other special registers. The special registers can be referred to in most cases as "CURRENT register_reserved_word" to represent some value in the data type & attributes that defines the register; the CLIENT_USERID is a VARCHAR(255) value. For example there is the USER special register which can be used in a SELECT [INTO] or a VALUES statement to retrieve the user for the session, and that value could be inserted into a TABLE. As an effective variable, the special register can be compared against as an operand in a predicate similar to a literal, variable, or column. Thus a VIEW or stored procedure might might encapsulate a "SELECT SomeColumn FROM SomeFile WHERE CompareColumn = CURRENT USER" to limit which data the requester can access via the SomeFile TABLE or VIEW.

The CLIENT USERID and its parent topic SPECIAL REGISTERs:

The client userid could be stored in a row of a TABLE, but the column would need to be defined in the CREATE TABLE just as for most any other data; i.e. there is no implicit[ly] hidden column in all tables from which the "updated by" client id could be retrieved. Thus from the above SELECT example, the create table for SomeFile would need to include the CompareColumn column in the column list and specify a data type and attributes compatible with the special register, for how the column & register will be used in the application.

Regards, Chuck

Ashish Kulkarni wrote:

I was looking into this new method setClientInfo added in
AS400JDBCConnection class, and was not sure what would this do

I added as400JDBCConn.setClientInfo("ClientUser", "MYUSERID");
and in the job log of this connection I see:
The following special registers have been set: CLIENT_USERID:

But I am not sure how can I use this, any ideas? Will this be
used when updating table, so I could know who updated this

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