Group - Cursor databases

 

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In database packages, a cursor comprises a control structure for the successive traversal (and potential processing) of records in a result set. Cursors provide a mechanism by which a database client iterates over the records in a database. Using cursors, the client can get, put, and delete database records. Database programmers use cursors for processing individual rows returned by the database system for a query. Cursors address an issue many programming languages suffer from: impedance mismatch[citation needed]. Most procedural programming languages do not offer any mechanism for manipulating whole result-sets at once. In this scenario, the application must process rows in a result-set sequentially. Thus one can think of a database cursor as an iterator over the collection of rows in the result set. Several SQL statements do not require the use of cursors. That includes the INSERT statement, for example, as well as most forms of the DELETE and UPDATE statements. Even a SELECT statement may not involve a cursor if it is used in the variation of SELECT INTO. A SELECT INTO retrieves at most a single row directly into the application. 



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