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Will jdbc Prepared Statement's executeQuery ever return null.

Shankar Raj
Greenhorn

Joined: Aug 26, 2008
Posts: 4
Though Java API says never null. People generally check if (rs!=null) rigt after some rs=ps.executeQuery();
just curious will ever they get rs==null say db was not connecting etc. I presume it would throw exceptions and will never encounter such situations but why do people write this?


Regards,<br />Shankar Raj.J
Christophe Verré
Sheriff

Joined: Nov 24, 2005
Posts: 14688
    
  16

Shankar Raj wrote:People generally check if (rs!=null) rigt after some rs=ps.executeQuery();

Generally ? Only people who don't read the API do.

[edited to fix quote marks]


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Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30762
    
156

Christophe is 100% correct. executeQuery() does not return null. Checking for null is poor practice and not considered a JDBC idiom.


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It is sorta covered in the JavaRanch Style Guide.
 
subject: Will jdbc Prepared Statement's executeQuery ever return null.