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Temporary Table + Variable + Java
Posted by: Eu Mesmo ()
Date: June 19, 2012 01:20AM

Hello

I'm having some problems to get a variable from a temporary table using Java. If I execute at the mysql console everything works fine, and I get the right value of "contador"

mysql> SELECT contador FROM ( (SELECT IFNULL((@conti:=@conti+1),(@conti:=1)) AS contador FROM m_142920))T LIMIT 10;
+----------+
| contador |
+----------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
+----------+

althought if I use from the ResultSet in java. Variable contador for the same line is always "1".

ResultSet rebusca;
...
while (rebusca.next()) {
...

System.out.println(rebusca.getString(1));

-----------------
The mysql line above I got from mysql.log so is exactly the same executed from java.

It seens like it cannot initiate and keep the variable in the memory, when using java.
If I initiate the variable @conti in other java line, its work.

I also tried to use:
CASE WHEN @conti IS NULL THEN @conti:=1 ELSE THEN @conti:=@conti+1 END

But still same result, from console it works but it doesnt from java.

The only workaround I have found that make it works is to use JOIN
then:
SELECT contador FROM ((SELECT (@conti:=@conti+1) AS contador FROM m_142920 JOIN (SELECT @conti:=1)tt ))T LIMIT 10;


Does anyone have some advice?

thanks a lot

Thiago
a00s.com



Edited 1 time(s). Last edit at 06/19/2012 02:38AM by Eu Mesmo.

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