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SAP Sybase SQL Anywhere 16.0 » SQL Anywhere Server - Programming » Application development using SQL

 

SQL Anywhere cursors

Any cursor, once opened, has an associated result set. The cursor is kept open for a length of time. During that time, the result set associated with the cursor may be changed, either through the cursor itself or, subject to isolation level requirements, by other transactions. Some cursors permit changes to the underlying data to be visible, while others do not reflect these changes. A sensitivity to changes to the underlying data causes different cursor behavior, or cursor sensitivity.

SQL Anywhere provides cursors with a variety of sensitivity characteristics. This section describes what sensitivity is, and describes the sensitivity characteristics of cursors.

This section assumes that you have read Cursors.

 Membership, order, and value changes
 Visible and invisible changes

Cursor sensitivity
Cursor sensitivity example: A deleted row
Cursor sensitivity example: An updated row
Insensitive cursors
Sensitive cursors
Asensitive cursors
Value-sensitive cursors
Cursor sensitivity and performance
Cursor sensitivity and isolation levels
Requests for SQL Anywhere cursors