我无法使用Java NetBeans从DB读取

Question

I have this code and I faced a problem to read information from MySQL database using java netbeans, data type inside database varchar

import com.mysql.jdbc.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.Scanner;

public class NewDataBase {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        try{
              Connection con = DriverManager.getConnection("jdbc:mysql://localhost/mydb","root", "password");
              Statement stmt = (Statement) con.createStatement();
              System.out.println("Enter name");
              String name =sc.next();
              String SQL = "select * from list where Name ='"+ name + "'";
              ResultSet rs = stmt.executeQuery(SQL);
              System.out.print("Name: " + rs.getNString("Name"));
              System.out.print("Number: " + rs.getNString("Number"));
              // while(rs.next())
              // {
              //   System.out.print("Name: " + rs.getNString("Name"));
              //  System.out.print("Number: " + rs.getNString("Number"));

              //}
        }catch(Exception e){
            System.out.print("Error:" + e.getMessage());
        } 
    }
}

---

Error:Can not call getNString() when field's charset isn't UTF-8

Answer 1

尝试使用rs.getString("Name")代替rs.getNString("Name") 。

Answer 2

Use:

    Properties props = new Properties(); 
    props.put("user", "root");         
    props.put("password", "password");
    props.put("useUnicode", "true");
    props.put("useServerPrepStmts", "false"); // use client-side prepared statement
    props.put("characterEncoding", "UTF-8"); // ensure charset is utf8 here

    String url = "jdbc:mysql://localhost/mydb";
    Connection connection = DriverManager.getConnection(url, props);

    PreparedStatement ps = 
        connection.prepareStatement("INSERT INTO list (Name, Number) VALUES (?, ?)");

    String testNumber = "12345";
    String testName = "name1";
    pstmt1.setNCharacterStream(1, new StringReader(testName), testName.length());
    ps.setNCharacterStream(2, new StringReader(testNumber), testNumber.length());
    ps.execute();

Also don't forget to comment in

if (rs.next()) {
    System.out.print("Name: " + rs.getNString("Name"));
    System.out.print("Number: " + rs.getNString("Number"));
}

Answer 3

I am 100% sure this works. This answer I got from Namberi.

rs.getString("Name") instead of rs.getNString("Name")

Answer 4

if (rs.next()) {
    rs.getString("Name");
}
rs.close();
stmt.close();
con.close();

And yes, better use a PreparedStatement for SQL injection and escaping of backslash, quote and such.