Version 4.2.6 for Mainframes (Update)
 —  Statements  —

READ RESULT SET - SQL

Common Set Syntax:

READ [(limit)] RESULT SET result-set INTO

VIEW view-name

FROM ddm-name
parameter
   [GIVING [:] sql-code]
END-RESULT

Extended Set Syntax:

READ [(limit)] RESULT SET result-set INTO

VIEW view-name

FROM ddm-name
parameter
    [WITH INSENSITIVE SCROLL [:] scroll-hv]
   [GIVING [:] sql-code]
[WITH ROWSET POSITIONING FOR

[:] row_hv

ROWS]
integer
END-RESULT

This document covers the following topics:

For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.

Belongs to Function Group: Database Access and Update

See also READ RESULT SET - SQL in the Natural for DB2 part of the Database Management System Interfaces documentation.


Function

The SQL statement READ RESULT SET can only be used in conjunction with a CALLDBPROC statement. It is used to read a result set which was created by a stored procedure that was invoked by a previous CALLDBPROC statement.

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Restriction

This statement is available only with Natural for DB2.

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Syntax Description

limit
Limit Option:

You can limit the number of rows to be read. You can specify the limit either as a numeric constant (0 to 4294967295) or as a variable of format N, P or I.

result-set
Result Set:

As result-set you specify a result-set locator variable filled by a preceding CALLDBPROC statement. Result-set has to be a variable of format/length I4.

Note:
If a syncpoint operation takes place between the CALLDBPROC statement and the READ RESULT SET statement, the result sets can no longer be accessed by the READ RESULT SET statement.

FROM ddm-name
DDM Name:

As ddm-name you specify the name of the data definition module (DDM) which is used to "address" the database executing the stored procedure. For more information, see ddm-name.

WITH INSENSITIVE SCROLL [:] scroll_hv
WITH INSENSITIVE SCROLL Clause:

This clause belongs to the SQL Extended Set.

Using this clause causes the application to use an insensitive scrollable cursor to access the result set created by the previously invoked stored procedure. In order to use this clause, the stored procedure must have created the result set with a scrollable cursor. The scroll_hv has to be an alphanumeric Natural variable which contains the scrolling direction. The scroll_hv will be evaluated each time the READ RESULT SET processing loop is executed.

If the GIVING sqlcode option is specified as well, the processing loop will stay open, even if an sqlcode +100 (row not found) is returned from the RDBMS.

The processing will be terminated, if the application issues an ESCAPE statement or if the sqlcode +100 (row not found) is encountered five times successively without a terminal I/O.

If the GIVING sqlcode option is not specified , the processing loop will be closed, if any sqlcode other than 0 (successs) is returned from the RDBMS.

GIVING sqlcode
GIVING sqlcode Clause:

This clause may be used to obtain the SQL code of the SQL "fetch" operation used to process the result set.

If this clause is specified and the SQL code of the SQL operation is not 0, no Natural error message will be issued. In this case, the action to be taken in reaction to the SQL code value has to be coded in the invoking Natural object.

The sqlcode field has to be a variable of format/length I4.

If the GIVING sqlcode clause is omitted, a Natural error message will be issued if the SQL code is not 0.

WITH ROWSET POSITIONING FOR ... ROWS
WITH ROWSET POSITIONING FOR ... ROWS Clause:

This clause belongs to the SQL Extended Set.

Using this clause causes the application to use an insensitive scrollable cursor to access the result set created by the previously invoked stored procedure. In order to use this clause, the stored procedure must have created the result set with a scrollable cursor. The scroll_hv has to be an alphanumeric Natural variable which contains the scrolling direction. The scroll_hv will be evaluated each time the READ RESULT SET processing loop is executed.

If the GIVING sqlcode option is specified as well, the processing loop will stay open, even if an sqlcode +100 (row not found) is returned from the RDBMS.

The processing will be terminated, if the application issues an ESCAPE statement or if the sqlcode +100 (row not found) is encountered five times successively without a terminal I/O.

If the GIVING sqlcode option is not specified , the processing loop will be closed, if any sqlcode other than 0 (successs) is returned from the RDBMS.

END-RESULT
End of READ RESULT SET Statement:

The Natural reserved keyword END-RESULT must be used to end the READ RESULT SET statement.

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Example

See the example in the CALLDBPROC statement.

In addition, see the corresponding Natural database interface documentation.

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