ResultSet: wasNull()
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
String url = "jdbc:odbc:technical_library";
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String theStatement =
"SELECT authid, lastname, firstname, email FROM authors ORDER BY authid";
try {
Class.forName(driver);
Connection connection = DriverManager.getConnection(url, "guest", "guest");
Statement queryAuthors = connection.createStatement();
ResultSet results = queryAuthors.executeQuery(theStatement);
String lastname, firstname, email;
int id;
while(results.next()) {
id = results.getInt(1);
lastname = results.getString(2);
firstname = results.getString(3);
email = results.getString(4);
if(results.wasNull()) {
email = "no email";
}
System.out.println(Integer.toString(id) + ", " +
lastname.trim() + ", " +
firstname.trim() +", " +
email.trim());
}
queryAuthors.close();
} catch (Exception e) {
System.err.println(e);
}
}
}
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