"invalid character value for cast" 通过 UCanAccess 插入时出错

"invalid character value for cast" error on INSERT via UCanAccess

我遇到了错误

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::3.0.6 data exception: invalid character value for cast

当我运行这个代码时:

 package aoa;
    import java.sql.*;
    public class Aoa {


        public static void main(String[] args)  {
             Connection cn;
      Statement st;
      ResultSet re;
      String ID ="username"; 
      String NAME="password";  


      try{

        Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
        cn=DriverManager.getConnection("jdbc:ucanaccess://C:\Users\MUHAMMAD SHAHAB\STUD1.accdb");
        st = cn.createStatement();
       String q = "INSERT INTO STUD1 ([Id], [Address]) VALUES (?, ?)";
    PreparedStatement pst = cn.prepareStatement (q);
    pst.setString(1, "a");
    pst.setString(2, "b");
    pst.executeUpdate();

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

        catch(ClassNotFoundException | SQLException e)
        {
          System.out.println(e);
        }

    }       
    }

我做错了什么?

你会得到错误

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::3.0.6 data exception: invalid character value for cast

如果您在字符串值无法转换为数字时尝试通过 setString 将值分配给数字列。在您的情况下,[Id] 列几乎肯定是数字,但是

pst.setString(1, "a");

正在尝试将值 "a" 分配给该列,但 "a" 无法转换为数字。