BOOLEAN data type

Informix®

Informix supports the BOOLEAN data type, which can store 't' or 'f' values.

Genero BDL implements the BOOLEAN data type in a different way: A BOOLEAN variable stores integer values 1 or 0 (for TRUE or FALSE). This type is designed to hold the result of a boolean expression.

IBM® DB2®

IBM DB2 does not provide a BOOLEAN SQL type.

Solution

The DB2 database interface converts BOOLEAN type to CHAR(1) columns and stores '1' or '0' values in the column.

The BOOLEAN type translation can be controlled with the following FGLPROFILE entry:
dbi.database.dsname.ifxemul.datatype.boolean = { true | false }
For more details see IBM Informix emulation parameters in FGLPROFILE.