PreparedStatement setNull(..)

Question

Java PreparedStatement provides a possibility to explicitely set a Null value. This possibility is:

prepStmt.setNull(parameterIndex, Types.VARCHAR);
<         


        

Answer 1

preparedStatement.setNull(index, java.sql.Types.NULL);

that should work for any type. Though in some cases failure happens on the server-side, like: for SQL:

COALESCE(?, CURRENT_TIMESTAMP)

Oracle 18XE fails with the wrong type: expected DATE, got STRING -- that is a perfectly valid failure;

Bottom line: it is good to know the type if you call .setNull()