Sql Error

Hi.

How can i connect to an SQL Database?

I'm using;

<b>data: conex like dbcon-con_name value 'NOMINAS'.

EXEC SQL.

connect to :conex as 'C1'

ENDEXEC.</b>

When i execute this code i got a dump:

DBIF_DSQL2_SQL_ERROR

No value given for one or more required parameters.

"connect to ? as C1"

Anybody can help with this??

Thanks