Implicit Cursor Conversions

Artigo
06/28/2007

Applications can request a cursor type and then execute an SQL statement that is not supported by cursors of the type requested. In such a scenario, Microsoft SQL Server 2005 Compact Edition (SQL Server Compact Edition) tries to use an alternative cursor type that supports the properties requested of the cursor. If such a cursor cannot be created, an error is returned.

The following table lists the factors that trigger SQL Server Compact Edition to implicitly convert a cursor from one type to another.

Query Triggers for Conversion	Forward-only and Forward-only/read-only	Keyset-driven
Query FROM clause references no tables	Becomes static	Becomes static
Query contains: Select list aggregates GROUP BY UNION DISTINCT HAVING	Error	Error
Query generates an internal work table. For example, the columns of an ORDER BY clause are not covered by an index	Becomes keyset	NA

Query FROM clause references no tables

Becomes static

Query contains:

Select list aggregates
GROUP BY
UNION
DISTINCT
HAVING

Error

Query generates an internal work table. For example, the columns of an ORDER BY clause are not covered by an index

Becomes keyset

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Implicit Cursor Conversions

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