JDBC: allow update of Date-Columns with NULL

Klaus Thiele (kth(at)pi-ag(dot)com) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
JDBC: allow update of Date-Columns with NULL

Long Description
JDBC: updating of Date (and other not_String)-columns with an null value throws an exception!
(this works with other jdbc-drivers (oracle, informix,...)

Sample Code
String updateStatement = "update table set datefield = ?";
prepStmt = con.prepareStatement(updateStatement);
prepStmt.setDate(1, datefield); // datefield is null!!
prepStmt.executeUpdate();
==> "Exception: No value specified for parameter 1"

Solution:
add following code to "PreparedStatement.java":
in method "setDate()" (and others):
// if the passed value is null, then set this column to null
if(x==null)
set(parameterIndex,"null");
else {
[...]

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