Help Center/ GaussDB(DWS)/ Developer Guide/ Standard data warehouse (9.1.0.x)/ GaussDB(DWS) Stored Procedure/ GaussDB(DWS) Stored Procedure Cursor/ Overview

Updated on 2024-12-18 GMT+08:00

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Overview

To process SQL statements, the stored procedure process assigns a memory segment to store context association. Cursors are handles or pointers to context areas. With cursors, stored procedures can control alterations in context areas.

If JDBC is used to call a stored procedure whose returned value is a cursor, the returned cursor is not available.

Cursors are classified into explicit cursors and implicit cursors. Table 1 shows the usage conditions of explicit and implicit cursors for different SQL statements.

**Table 1** Cursor usage conditions
SQL Statement	Cursor
Non-query statements	Implicit
Query statements with single-line results	Implicit or explicit
Query statements with multi-line results	Explicit

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