• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

MySQL Prepared Statement & NULL

 
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I have an app with a CachedRowSetImpl that reads from a MySQL database (using "com.mysql.jdbc.Driver")

I'm passing the RowSet a prepared statement that looks like this:



...and then setting the parameter with setString, setInt, etc... I'm using the LIKE operater to allow me to enter the '%' wildcard into the parameter.

The only place where its falling down is when I try to select NULL fields. Using setNULL does not work as MySQL treats NULL differently from other databases. The usual way to execute a clause on NULL is



...but using the 'LIKE' or '=' operators fails when used with NULL under MySQL.

So is there any way I can put a WHERE clause on a column with a NULL value using a PreparedStatement like I have above?
 
author & internet detective
Posts: 41860
908
Eclipse IDE VI Editor Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Rob J Ford wrote:...but using the 'LIKE' or '=' operators fails when used with NULL under MySQL.

So is there any way I can put a WHERE clause on a column with a NULL value using a PreparedStatement like I have above?


It should fail. Testing for equality (or like) is undefined according to the SQL starndard. MySql is behaving correctly. You have to use "is null" to check for null in SQL.
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
reply
    Bookmark Topic Watch Topic
  • New Topic