How to retrieve OUT parameter from MYSQL stored procedure to stream in Pentaho Data Integration (Kettle)?

问题

I am unable to get the OUT parameter of a MySQL procedure call in the output stream with the procedure call step of Pentaho Kettle.

I'm having big trouble retrieving OUT parameter from MYSQL stored procedure to stream. I think it's maybe a kind of bug becouse it only occurs with Integer out parameter, it works with String out parameter. The exception I get is:

Invalid value for getLong() - '

I think the parameters are correctly set as you can see in the ktr.

You can replicate the bug in this way:

Schema

create schema if not exists test;
use test;
DROP PROCEDURE IF EXISTS procedure_test;
delimiter $$
CREATE PROCEDURE procedure_test(IN in_param INT UNSIGNED, OUT out_param INT UNSIGNED)
 BEGIN
  SET out_param := in_param;
 END
$$

KTR You can download here .ktr file with the steps. You just have to setup the connection to MySQL test schema to try it.

Other data

MySQL connector: 5.1.30
MySQL version: 5.5
Kettle version: 5.0.1-stable
OS: Ubuntu 12.04

Any help from the community will be highly appreciated.

Thanks in advance!

回答1:

The bug does not seem to occur if number (and decimal at DB level) is used as the output parameter type. So this may be used as a work around.

With a DB procedure using this statement (as returned by phpMyAdmin):

CREATE DEFINER = `root`@`localhost` 
     PROCEDURE `procedure_test` ( IN `in_param` INT ZEROFILL, 
                                  OUT `out_param` DECIMAL( 10 ) ) 
     NOT DETERMINISTIC NO SQL SQL SECURITY DEFINER 
     BEGIN 
        SET out_param =2 * in_param;
     END

I was able to run this transformation

reading this input

IN_VALUE
1
2
3
99

yielding this output

<?xml version="1.0" encoding="UTF-8"?>
<Rows>
  <Row><OUT_VALUE> 2,0</OUT_VALUE> </Row>
  <Row><OUT_VALUE> 4,0</OUT_VALUE> </Row>
  <Row><OUT_VALUE> 6,0</OUT_VALUE> </Row>
  <Row><OUT_VALUE> 198,0</OUT_VALUE> </Row>
</Rows>

回答2:

I have solved the problem using SQL script step with an SQL like this:

CALL procedure_test(?, @output_value);
INSERT INTO output_value_for(in, out) VALUES (?, @output_value);

SQL script step don't allow output value to stream, however it was a better solution for my problem. After procedure execution, I inserted in MySQL database output value of the procedure becouse I need to persist that relation.

However, I think Marcus answer is better approach for the posed problem. If you have this problem, you should take it into account as work around.

来源：https://stackoverflow.com/questions/23444099/how-to-retrieve-out-parameter-from-mysql-stored-procedure-to-stream-in-pentaho-d

标签

mysql

stored-procedures

pentaho

kettle