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 {
Connection conn = getConnection();
Statement st = conn.createStatement();
st.executeUpdate("create table survey (id int,name varchar(30));");
st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
st.executeUpdate("insert into survey (id,name ) values (2,null)");
st = conn.createStatement();
ResultSet rs = st.executeQuery("SELECT * FROM survey");
// extract data from the ResultSet
while (rs.next()) {
int id = rs.getInt(1);
System.out.println("id="+id);
String name = rs.getString(2);
System.out.println("name="+name);
if (rs.wasNull()) {
System.out.println("name is null");
} else {
System.out.println("name is not null");
}
System.out.println("---------------");
}
rs.close();
st.close();
conn.close();
}
private static Connection getConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
String url = "jdbc:hsqldb:mem:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
}
id=1
name=nameValue
name is not null
---------------
id=2
name=null
name is null
---------------