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The cursor will remain valid until the ResultSet or its parent Statement is closed.
Note that not all DBMSs support positioned update and delete. The DatabaseMetaData.supportsPositionedDelete and supportsPositionedUpdate methods can be used to discover whether a particular connection supports these operations. When they are supported, the DBMS/driver must insure that rows selected are properly locked so that positioned updates do not result in update anomalies or other concurrency problems.
Currently we do not propose to provide support for either scrollable cursors or ODBC style bookmarks as part of JDBC.