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case insensitive search

 
Alex Kravets
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Hello,
How do I construct an SQL query that is case insensitive? I want to be able to use strings such as 'BOB' or 'bob', or 'Dave' or 'dave'. Another words if user enters 'bob', in the database it could be listed as 'BOB' or Bob' or 'bob' or 'bOb' or 'boB'... you get the picture,. So how do I find by just entering 'bob' all 5 cases in this exampe?
thanks,
Alex
 
Michael Zalewski
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Depends on the database you are using.
Look up string functions to convert to upper case, and use that. I think in Oracle, it's TO_UPPER. So you would convert your search term to upper case, then execute
SELECT * FROM Person
WHERE TO_UPPER( first_name) = 'BOB'
Of course, a better way to do this is to use a PreparedStatement.
PreparedStatement psFindBob = getConnection().prepareStatement(
"SELECT * FROM Person"
+ " WHERE TO_UPPER( first_name) = ?
);
psFindBob.setString( sBob.toUpperCase());
ResultSet rsFindBob = psFindBob.executeQuery();
...
PreparedStatement will perform better if you do this same query several times. It will also handle searching for names like O'Leary (embedded quotes or SQL reserved words).
 
Alex Kravets
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Ok, but this will only test for case such as 'BOB' and not 'Bob' or 'boB'. Or will it?
 
Alex Kravets
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oh, ok...never mind, I got it.
 
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