Opens a new database connection in unique-session mode.


DATABASE { dbname[@dbserver] | variable | string } [EXCLUSIVE]
  1. dbname identifies the database name.
  2. dbserver identifies the IBM® Informix® database server (INFORMIXSERVER).
  3. variable can be any character string defined variable containing the database specification.
  4. string can be a string literal containing the database specification.


The DATABASE instruction opens a connection to the database server, like CONNECT TO, but without user and password specification.
  DATABASE stores
It is possible to use a program variable containing the database specification.
  DEFINE dbname VARCHAR(100)
  LET dbname = arg_val(1)
  DATABASE dbname

If a current connection exists, it is automatically closed before connecting to the new database.

The connection is closed with the CLOSE DATABASE instruction, or when the program ends.

When using the DATABASE instruction, the database user is typically authenticated through the operating system user. If needed, the database user name and password can be provided from a callback function, with the dbi.default.userauth.callback FGLPROFILE entry.

The DATABASE instruction raises an exception if the connection can not be established, for example, if you specify a database that the runtime system cannot locate, or cannot open, or for which the user of your program does not have access privileges.

The EXCLUSIVE keyword can be used to open an IBM Informix database in exclusive mode to prevent access by anyone but the current user. This keyword is IBM Informix specific and is not recommended when writing a portable SQL application.

The CONNECT TO instructions allow better control over database connections; it is recommended that you use these instructions instead of DATABASE and CLOSE DATABASE.

When used outside a program block, the DATABASE instruction defines the database schema for compilation (for DEFINE LIKE). Furthermore, when DATABASE is used before a MAIN block, it defines also an implicit database connection. To specify the database schema for compilation, consider using SCHEMA instead.