could not translate host name "user=" to address: Unknown host?

CI框架+postgerSQL+nginx
現(xiàn)在又2個數(shù)據(jù)庫：中心庫center，公司庫：n001
登錄時使用中心庫驗證，可以正常登錄。
在控制器A構(gòu)造方法中，加載公司庫：n001.
訪問index方法，可以查詢n001數(shù)據(jù)庫中的數(shù)據(jù)。
但是在B方法中，使用同樣的查詢語句，則報錯：

ERROR - 2017-11-08 15:12:12 --> Severity: Warning --> pg_pconnect(): Unable to connect to PostgreSQL server: could not translate host name "user=" to address: Unknown host D:\www\system\database\drivers\postgre\postgre_driver.php 153
ERROR - 2017-11-08 15:12:12 --> Unable to connect to the database
ERROR - 2017-11-08 15:12:12 --> userdb：{"dbdriver":"postgre","schema":"public","dsn":"host= user= dbname=","username":null,"password":null,"hostname":null,"database":null,"subdriver":null,"dbprefix":"","char_set":"utf8","dbcollat":"utf8_general_ci","encrypt":false,"swap_pre":"","port":"","pconnect":true,"conn_id":false,"result_id":false,"db_debug":false,"benchmark":0,"query_count":0,"bind_marker":"?","save_queries":true,"queries":[],"query_times":[],"data_cache":[],"trans_enabled":true,"trans_strict":true,"cache_on":false,"cachedir":"","cache_autodel":false,"CACHE":null,"autoinit":true,"stricton":false}
ERROR - 2017-11-08 15:12:12 --> Severity: Warning --> pg_pconnect(): Unable to connect to PostgreSQL server: could not translate host name "user=" to address: Unknown host D:\www\system\database\drivers\postgre\postgre_driver.php 153
ERROR - 2017-11-08 15:12:12 --> Unable to connect to the database
ERROR - 2017-11-08 15:12:12 --> Severity: Warning --> pg_last_error() expects parameter 1 to be resource, boolean given D:\www\system\database\drivers\postgre\postgre_driver.php 480
ERROR - 2017-11-08 15:12:12 --> Query error:  - Invalid query: select * from sys_column where grid_id='477F6FAD-B3A8-653E-B41C-3999DEB0F890' order by sort_code asc

最后一條提示錯誤的SQL語句是沒問題的，可以出結(jié)果。

請問這樣改如何解決？