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    <p>For future reference: <a href="http://thebasilet.blogspot.be/2009/07/nhibernate-oracle-clobs.html" rel="nofollow">this post</a> perfectly describes what causes this error and how you can solve it.</p> <blockquote> <p>ORA-01461: can bind a LONG value only for insert into a LONG column</p> <p>This error is not very helpful and goggling it will most likely result in topics regarding oracle patches and the like. In reality this is a bug with the microsoft oracle client driver. The driver mistakenly infers the column type of the string being saved, and tries forcing the server to update a LONG value into a CLOB/NCLOB column type. The reason for the incorrect behavior is even more obscure and only happens when all the following conditions are met.</p> <ol> <li>when we set the IDbDataParameter.Value = (string whose length is : 4000 > length > 2000 )</li> <li>when we set the IDbDataParameter.DbType = DbType.String</li> <li>when DB Column is of type NCLOB/CLOB</li> </ol> <p>Unfortunately NHibernate 2.0's default behavior is to do exactly the above, making it quite more likely to run into this ugly bug when using nhibernate and oracle.</p> </blockquote> <p>Solution offered in the blog post: a custom NHibernate Oracle Driver:</p> <pre><code>/// &lt;summary&gt; /// Initializes the parameter. /// &lt;/summary&gt; /// &lt;param name="dbParam"&gt;The db param. /// &lt;param name="name"&gt;The name. /// &lt;param name="sqlType"&gt;Type of the SQL. protected override void InitializeParameter(System.Data.IDbDataParameter dbParam, string name, global::NHibernate.SqlTypes.SqlType sqlType) { base.InitializeParameter(dbParam, name, sqlType); //System.Data.OracleClient.dll driver generates an exception //we set the IDbDataParameter.Value = (string whose length: 4000 &gt; length &gt; 2000 ) //when we set the IDbDataParameter.DbType = DbType.String //when DB Column is of type NCLOB/CLOB //The Above is the default behavior for NHibernate.OracleClientDriver //So we use the built-in StringClobSqlType to tell the driver to use the NClob Oracle type //This will work for both NCLOB/CLOBs without issues. //Mapping file will need to be update to use StringClob as the property type if ((sqlType is StringClobSqlType)) { ((OracleParameter)dbParam).OracleType = OracleType.NClob; } } </code></pre>
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    1. COWhilst this may theoretically answer the question, [it would be preferable](http://meta.stackexchange.com/q/8259) to include the essential parts of the answer here, and provide the link for reference.
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    2. COJust did that, thanks for pointing out.
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