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DatabasePostgres inherits existing methods from Database, which is effectively the database abstraction object for MySQL; however, there is no method in DatabasePostgres to override method Database::fieldType, which gets inherited.

A call to DatabasePostgres::fieldType generates a fatal error because it is written for MySQL and utilizes mysql_field_type(), a PHP function that returns the database field type for MySQL.

DatabasePostgres::fieldType should be added to DatabasePostgres.php that overrides Database::fieldType and uses pg_field_type() or pg_fieldtype() (depending on the PHP version) instead.