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If I use setNull(1, java.sql.Types.DATE); function, it will insert null on my table's column.
I want to select the date from another table and insert into my table's column, what should I do?
I am sure I cannot call setNull(1,java.sql.Types.DATE), it will insert NULL in my column.
You don't describe how you failed. It would definitely help if you provided some explanation.
However I will take a guess: you don't understand that the setDate() method requires a java.sql.Date object and not a java.util.Date object, and you don't know how to get one of those. You said you were getting a date from some other table? Then the getDate() method returns you a java.sql.Date object which you can use.