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Oracle jdbc + null value for primitive type

Ryan Crum
Greenhorn

Joined: Jan 11, 2002
Posts: 1
I would like to insert 'null' into a numeric column in Oracle (the column does allow null fields) however doing this in a pain free manor has proven difficult so far. I have tried the following:
PreparedStatement ps ....
// The setObject(...) doesnt work, "Invalid column type" error is returned
ps.setObject( idx2col, null );
The following code works:
ps.setNull( idx2col, Types.INTEGER );
The problem with the above code is that it requires that I know the type of the field the object will be going into. I do not know this information because the function that executes this PreparedStatement is very general. Sometimes the column that will be set to null is a number, sometimes its a string or date...
Does anyone have suggestions as to how a null can be inserted into the column without knowing the type (Using Oracle + their thin jdbc driver)?
Thanks.
Stanley Tan
Ranch Hand

Joined: May 17, 2001
Posts: 243
Hi. I just went through a similar problem. It's really annoying to know that it works for everyone else. Anyway, I've got the same setup as you (Oracle, thin driver). What I did what to use a Statement instead of a PreparedStatement and then just append the query on.
Amit Da
Greenhorn

Joined: Mar 07, 2003
Posts: 16
From a preparedStatement one can easily know the jdbc type of any parameter.(refer to jdk1.4 javadoc of PreparedStatement). prepStmt.getParameterMetaData returns ParameterMetaData which has getParameterType(int param) giving jdbc type. Now pstmt.setNull(idx, jdbcType) can be called with ease
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61766
    
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"amitda",

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