Cursors pl sql updating

A cursor can be SENSITIVE or INSENSITIVE to such data modifications.

cursors pl sql updating-31cursors pl sql updating-43

Additionally, a cursor may be INSENSITIVE, in which case the DBMS tries to apply sensitivity as much as possible.

Cursors are usually closed automatically at the end of a transaction, i.e.

Cursors enable manipulation of whole result sets at once.

In this scenario, a cursor enables the rows in a result set to be processed sequentially.

In computer science, a database cursor is a control structure that enables traversal over the records in a database.

Cursors facilitate subsequent processing in conjunction with the traversal, such as retrieval, addition and removal of database records.

With a non-scrollable (or forward-only) cursor, you can each row at most once, and the cursor automatically moves to the next row.

After you fetch the last row, if you fetch again, you will put the cursor after the last row and get the following code: SQLSTATE 02000 (SQLCODE 100).

A programmer makes a cursor known to the DBMS by using a Once an application has processed all available rows or the fetch operation is to be positioned on a non-existing row (compare scrollable cursors below), the DBMS returns a SQLSTATE '02000' (usually accompanied by an SQLCODE 100) to indicate the end of the result set.

The final step involves closing the cursor using the After closing a cursor, a program can open it again, which implies that the DBMS re-evaluates the same query or a different query and builds a new result set.

This is done because JDBC also activates auto-commit per default.

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