Start Oracle trigger if updating column

Oracle trigger if updating column

However, removing the open cursor with the JDBC method invalidates the positioned update.

Correlation names provide access to the old and new values for each column.

This section describes the different types of triggers: statement.

Notice that the database stores triggers separately from their associated tables.

Text description of the illustration cncpt076A trigger can also call out to a C procedure, which is useful for computationally intensive operations.

This chapter includes: statement is issued against the associated table or, in some cases, against a view, or when database system actions occur.

These procedures can be written in PL/SQL or Java and stored in the database, or they can be written as C callouts. A trigger stored in the database can include SQL and PL/SQL or Java statements to run as a unit and can invoke stored procedures.

If columns were specified in the FOR UPDATE clause of the SELECT statement used to generate the cursor, only those columns can be updated.

If no columns were specified or the select statement did not include a FOR UPDATE clause, all columns may be updated.

However, procedures and triggers differ in the way that they are invoked.

A procedure is explicitly run by a user, application, or trigger.

Dropping an alias invalidates a prepared update statement if the latter statement uses the alias.