Cursor Variable Declaration

A cursor variable is like an explicit cursor that is not limited to one query.

To create a cursor variable, either declare a variable of the predefined type SYS_REFCURSOR or define a REF CURSOR type and then declare a variable of that type.

Restrictions on Cursor Variables

  • You cannot use a cursor variable in a cursor FOR LOOP statement.

  • You cannot declare a cursor variable in a package specification.

    That is, a package cannot have a public cursor variable (a cursor variable that can be referenced from outside the package).

  • You cannot store the value of a cursor variable in a collection or database column.

  • You cannot use comparison operators to test cursor variables for equality, inequality, or nullity.

  • Using a cursor variable in a server-to-server remote procedure call (RPC) causes an error. However, you can use a cursor variable in a server-to-server RPC if the remote database is a non-Oracle database accessed through a Procedural Gateway.

Topics

Syntax

ref_cursor_type_definition ::=

Description of ref_cursor_type_definition.gif follows
Description of the illustration ref_cursor_type_definition.gif

cursor_variable_declaration ::=

Description of cursor_variable_declaration.gif follows
Description of the illustration cursor_variable_declaration.gif

Semantics

ref_cursor_type_definition

type

Name of the REF CURSOR type that you are defining.

RETURN

Specifies the data type of the value that the cursor variable returns.

Specify RETURN to define a strong REF CURSOR type. Omit RETURN to define a weak REF CURSOR type. For information about strong and weak REF CURSOR types, see "Creating Cursor Variables".

db_table_or_view

Name of a database table or view, which must be accessible when the declaration is elaborated.

cursor

Name of a previously declared explicit cursor.

cursor_variable

Name of a previously declared cursor variable.

record

Name of a user-defined record.

record_type

Name of a user-defined type that was defined with the data type specifier RECORD.

ref_cursor_type

Name of a user-defined type that was defined with the data type specifier REF CURSOR.

cursor_variable_declaration

cursor_variable

Name of the cursor variable that you are declaring.

type

Type of the cursor variable that you are declaring—either SYS_REFCURSOR or the name of the REF CURSOR type that you defined previously.

SYS_REFCURSOR is a weak type. For information about strong and weak REF CURSOR types, see "Creating Cursor Variables".

Examples

Related Topics

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