Determining If a Fetched Value Is NULL
When a ResultSet.getXXX() method encounters a NULL in the
database, it will convert it to a default value. For example, if NULL
was encountered in a NUMBER field, ResultSet.getInt() will return
0. In order to determine whether or not the actual value is a NULL,
wasNull() must be called. This method must be called immediately
after the value is fetched from the result set.
// Fetch each row from the result set
while (resultSet.next()) {
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