php - Can I MD5 a column I'm selecting? -

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I have done some Google engagement and nothing has been brought to it, so I am asking here.

I'm trying to run this query (the language is PHP): 

  SELECT * to the table WHERE MD5 (field1) = '$ var'   
 This is not returning to any rows,  
 Any help is appreciated.  
 PS  
 I have tried some variations such as "SELECT field1 from table to name where MD5 (name) = '$ var'" but it still does not work Does.  
 Edit:  
 I understand that there are a lot of things in answer to this question, such as 1. It is for a login system (it is related to a related, but Not for login system), 2. I'm not getting my values ​​before saving it DB (I am but this fixed position does not know plain text, thus I need an MD5 column in the SQL query ). A lot of these assumptions were done because I simplify hell out of example to express my question. Thanks to those who tried to answer.   
 
 
 Yes, an MD5 function of MySQL has been created.  
  & lt ;? Php ... (The table WHERE MD5 (password) = '$ password'; "" or "die" (... ??   
) should work fine if it If you are not returning to any rows, then you have to do something wrong.

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