Codeigniter update function doesn't work corectly -


I have a problem with the update function. This code is updating all the rows in the database and I want to update only the line with the login username. "Password" is one I have logged in and I have to replace it with password 3. The problem is that the password replaces all the rows (the password) in my database. 

  function edit_member () {$ new_member_update_data = array ('password' = & gt; md5 ($ this-> input- & gt; post ('password3')); $ This- & gt; Db- & gt; Where ('password', $ this-> input- & gt; post ('password')); $ Update = $ this- & gt; Db- & gt; Update ('subscription', $ new_member_update_data); Return $ update;    
 
 
 Assume that you have  logged in  So you get the  userId  from  Sessions  ..? Then use it as the  
  function edit_member () {$ new_member_update_data = array ('password' = & gt; MD5 ($ this-> Input-> Post (' Password3 '))); $ This- & gt; Db- & gt; Where ('iUserId', $ this-> session-> userdata ('iUserId')); $ Update = $ this- & gt; Db- & gt; Update ('subscription', $ new_member_update_data); Return $ update; }   
 Please consider that  iUserId  will be the area which is  unique  or  auto increment  field.

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