Concurrent Query through Informix JDBC

Question

Hi,
I am using Informix Jdbc in my JSP ( Driver Downloaded from IBM Site). In case of concurrent calls to that Jsp , I am getting mixed result in the client site. It's written in the Informix JDBC Spec that "The Same statement or resultset instance cannot be accessed concurrently accross the threads". But what is the alternative way? Anybody found any solution....Any help appriciated.

Answer 1

Hi k_dey,
I don't use Informix JDBC driver, but looking through the Informix JDBC Driver Programmer's Guide UNIX and Windows Environments, V2.21, it appears that statement caching is enabled by setting the STMT_CACHE environment variable to 1 (one). Unfortunately, I couldn't find anything in the guide on how to disable statement caching, so I searched the archives of the "comp.databases.informix" newsgroup (for the word 'STMT_CACHE') and it seems that if you set it to 0 (zero), it disables statement caching.
The guide says that you can set these environment variables through JDBC by either including NAME=VALUE pairs in the database connection URL, or supplying a "java.util.Properties" object as a parameter to the "getConnection()" method (in class "java.sql.DriverManager").
According to the guide, this is the format for the URL:
jdbc:informix-sqli://[{ip-address|host-name}:port-number][dbname]:
INFORMIXSERVER=server-name;[user=user;password=password]
[;name=value[;name=value]...]
So I guess you just need to write:
;STMT_CACHE=0instead of
;name=valueAnd here is some slightly modified code, also taken from the guide:
Properties pr = new Properties();
pr.put("STMT_CACHE","0");
conn = DriverManager.getConnection(newUrl, pr);The guide says that you must use only one of the above two methods, i.e. either set the environment variable in the URL, or use the "Properties" parameter.
Hope this helps.
Good Luck,
Avi.