А по какой проблеме общение? Если правильно понял, то по проблеме с ODBC?
Тогда они к производителю с проблемой хотят стукнуться
DataDirect Technologies- Data access drivers, ODBC, JDBC, ADO.NET
те просить @open ticket@ ?

I suggest you to use SQL Server, Oracle or DB2 data bases to run
stored procedures in VC, instead of Informix.
Anyway, we will open a ticket to datadirect support.
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I think that level JDBCdriver ok.
1. downloaded ifxjdbc.jar,
2. install IFXDriver into Portal
3.create JDBC_system into Portal, test connection system ok,
4.create VA-server-Services-JDBC_Connector-DataSources, test by
VA-server-Services-JDBC_Connector-DB_Initialization "select count(*) from
sysprocedures" - ok.
imho - VC incorrect form "call function" to JDBC -
informix_server/jdbc/log: {?= call my_procedure(?,?,?)} - not informix syntax
execute procedure my_procedure(?) - right
May be exist limitation by database/version's list for VC dataservice?