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The database cursor characteristic of traversal makes cursors akin to the programming language concept of iterator.
Cursors are used by database programmers to process individual rows returned by database system queries.
The SQL:2003 standard defines positioned update and positioned delete SQL statements for that purpose.
Such statements do not use a regular WHERE clause with predicates. The cursor must be opened and already positioned on a row by means of The cursor must operate on an updatable result set in order to successfully execute a positioned update or delete statement.
A cursor can be viewed as a pointer to one row in a set of rows.
The cursor can only reference one row at a time, but can move to other rows of the result set as needed.
To work with cursors you must use the following SQL statements This section introduces the ways the SQL:2003 standard defines how to use cursors in applications in embedded SQL.
Not all application bindings for relational database systems adhere to that standard, and some (such as CLI or JDBC) use a different interface.A holdable cursor is kept open over COMMIT and closed upon ROLLBACK.(Some DBMS deviate from this standard behavior and also keep holdable cursors open over ROLLBACK.) When a COMMIT occurs, a holdable cursor is positioned before the next row.Cursors enable manipulation of whole result sets at once.In this scenario, a cursor enables the sequential processing of rows in a result set.A program may position a scrollable cursor anywhere in the result set using the Scrollable cursors can potentially access the same row in the result set multiple times.Tags: Adult Dating, affair dating, sex dating