ASA Database Administration Guide
  Database Options
    Alphabetical list of options

TSQL_VARIABLES option [compatibility]

Function 

Controls whether the @ sign can be used as a prefix for Embedded SQL host variable names.

Allowed values 

ON, OFF

Default 

OFF

ON for Open Client and JDBC connections

Description 

When this option is set to ON, you can use the @ sign instead of the colon as a prefix for host variable names in Embedded SQL. This is implemented primarily for Transact-SQL compatibility.