Java數據庫不返回值

Question

我想開發一個簡單的程序，要求用戶的姓名和電話號碼，將其添加到MySQL數據庫，並返回結果。我有一切工作，直到程序應該打印數據庫的結果。有人能讓我知道我在做什麼錯嗎？

public class ContactList { 

static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; 
static final String DB_URL = "jdbc:mysql://Devry.edupe.net:8300/CunninghamCustomer"; 

static final String USER = "3508"; 
static final String PASS = "******"; 

public static void main(String[] args) { 
    Connection conn = null; 
    Statement stmt = null; 
    Customer aCustomer = new Customer(); 

    try{ 
     Class.forName("com.mysql.jdbc.Driver"); 

     conn = DriverManager.getConnection(DB_URL, USER, PASS); 

     stmt = conn.createStatement(); 
     String sql; 
     sql = "INSERT INTO CUSTOMER (" + aCustomer.getName() + "," + aCustomer.getPhoneNumber() + ")"; 
     ResultSet rs = stmt.executeQuery(sql); 
     rs.close(); 
     stmt.close(); 

     stmt = conn.createStatement(); 
     sql = "SELECT name, phone FROM CUSTOMER"; 
     ResultSet rs2 = stmt.executeQuery(sql); 

     while(rs2.next()) { 
      String name = rs2.getString("name"); 
      String phone = rs2.getString("phone"); 

      System.out.print("Name: " + name); 
      System.out.print(", Phone Number: " + phone); 
     } 

     rs2.close(); 
     stmt.close(); 
     conn.close(); 

    } catch(SQLException se) { 
     se.printStackTrace(); 

    } catch(Exception e) { 
     e.printStackTrace(); 

    } finally { 
     try { 
      if (stmt != null) 
       stmt.close(); 
     } catch (SQLException se) { 
      se.printStackTrace(); 
     } 
    } 

    System.out.println("Complete"); 
} 

} 

public class Customer { 

String name = "Unknown"; 
String phoneNumber = "Unknown"; 
String message = "Contact Added!"; 

public Customer() { 
    getInfo(); 
} 

public void getInfo() { 
name = JOptionPane.showInputDialog("Customer Name"); 
phoneNumber = JOptionPane.showInputDialog("Phone Number"); 
JOptionPane.showMessageDialog(null, message); 
} 

public String getName() { 
    return name; 
} 

public String getPhoneNumber() { 
    return phoneNumber; 
} 
} 

Answer 1

您在insert語句中忘記values。

sql = "INSERT INTO CUSTOMER VALUES(" + aCustomer.getName() + "," + aCustomer.getPhoneNumber() + ")";