Got this piece of code that handles some parameters and writes it to a database:
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
import java.sql.*;
public class QueryServlet extends HttpServlet {
@Override
public void doPost(HttpServletRequest req,HttpServletResponse res) throws IOException, ServletException
{
String instId = req.getParameter("instId");
String cartId = req.getParameter("cartId");
String desc = req.getParameter("desc");
String cost = req.getParameter("cost");
String amount = req.getParameter("amount");
String currency = req.getParameter("currency");
String name = req.getParameter("name");
String transId = req.getParameter("transId");
String transStatus = req.getParameter("transStatus");
String transTime = req.getParameter("transTime");
String cardType = req.getParameter("cardType");
Connection conn = null;
PrintWriter out = res.getWriter();
try {
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/orders", "root", "root");
String sqlStr = "insert into orderdetails "
+ "values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
try (PreparedStatement stmt = conn.prepareStatement(sqlStr)) {
stmt.setString(1, transId);
stmt.setString(2, instId);
stmt.setString(3, cartId);
stmt.setString(4, desc);
stmt.setString(5, cost);
stmt.setString(6, amount);
stmt.setString(7, currency);
stmt.setString(8, name);
stmt.setString(9, transStatus);
stmt.setString(10, transTime);
stmt.setString(11, cardType);
int updateCount = stmt.executeUpdate();
for (Enumeration<String> en = req.getParameterNames(); en.hasMoreElements();) {
String paramName = en.nextElement();
String paramValue = req.getParameter(paramName);
}
}
} catch (SQLException ex) {
ex.printStackTrace();
}
}
}
If I pass all the parameters on the post message the database is updated just fine. However, if I don't pass one of the parameters nothing is written to the database.
Could you help me to change it so that, if a parameter is not in the post message it will set that value as 0 or null in the database?
Thanks for all the help so far.