sql-connection-alist

sql-connection-alist is a variable defined in `sql.el'.
Its value is

nil

Documentation:
An alist of connection parameters for interacting with a SQL product.
Each element of the alist is as follows:

(CONNECTION (SQL-VARIABLE VALUE) ...)

Where CONNECTION is a case-insensitive string identifying the
connection, SQL-VARIABLE is the symbol name of a SQL mode
variable, and VALUE is the value to be assigned to the variable.
The most common SQL-VARIABLE settings associated with a
connection are: `sql-product', `sql-user', `sql-password',
`sql-port', `sql-server', and `sql-database'.

If a SQL-VARIABLE is part of the connection, it will not be
prompted for during login. The command `sql-connect' starts a
predefined SQLi session using the parameters from this list.
Connections defined here appear in the submenu SQL->Start... for
making new SQLi sessions.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.