在登录informix数据库时，填写了数据库名字比如叫 'demodb'。登录成功后，要怎么样才能获取这个数据库的名字‘demodb’。 在Oracle中 select name form V$database; 可以这样查询

会话所在当前数据库
SELECT DBINFO('dbname') as Current_Database FROM systables WHERE tabid = 1;
扩:
SELECT
DBINFO('dbhostname') as Current_Hostname ,
DBINFO('sessionid') AS My_Sessionid,
DBINFO('dbname') as Current_Database
FROM systables WHERE tabname = 'systables';