查询表达式“ System.Byte []”中的语法错误缺少运算符

如何解决查询表达式“ System.Byte []”中的语法错误缺少运算符

|| 嗨，我在SQL Server中使用存储过程将参数传递给查询， 但是现在我将数据库更改为ms access，这是我第一次处理。 如何将byte []传递给sql查询？ 因为我得到这个错误 查询表达式\'System.Byte [] \'中的语法错误（缺少运算符）。 这是我的代码

    public static int EditWhois(object ID,object Image,object Ranswer,object Fanswer1,object Fanswer2,object Fanswer3)
    {
        int result = 0;
        String sql = \"UPDATE Whois SET [Image]=\"+@Image+\",Ranswer=\" + Ranswer + \",Fanswer1=\" + Fanswer1 + \",Fanswer2=\" + Fanswer2 + \",Fanswer3=\" + Fanswer3 + \" WHERE ID=\" + ID;
        System.Windows.Forms.MessageBox.Show(sql);
        cmd = new OleDbCommand(sql,con);

        //cmd.Parameters.AddWithValue(\"@ID\",ID); 
        //cmd.Parameters.AddWithValue(\"@Image\",Image);
        //cmd.Parameters.AddWithValue(\"@Ranswer\",Ranswer);
        //cmd.Parameters.AddWithValue(\"@Fanswer1\",Fanswer1);
        //cmd.Parameters.AddWithValue(\"@Fanswer2\",Fanswer2);
        //cmd.Parameters.AddWithValue(\"@Fanswer3\",Fanswer3);

        if (con.State != ConnectionState.Open)
        {
            con.Open();
            result = cmd.ExecuteNonQuery();
            con.Close();
        }
        return result;
    }

    

解决方法

        使用@参数替换。同样如@BoltClock所说，更改您的方法签名。

public static int EditWhois(object ID,object Image,object Ranswer,object Fanswer1,object Fanswer2,object Fanswer3)
{
    int result = 0;
    String sql = \"UPDATE Whois SET [Image]=@Image,Ranswer=@Ranswer,\" + 
      \"Fanswer1=@Fanswer1,Fanswer2=@Fanswer2,Fanswer3=@Fanswer3 \" +
      \"WHERE ID=@ID\";
    cmd = new OleDbCommand(sql,con);

    cmd.Parameters.AddWithValue(\"@ID\",ID); 
    cmd.Parameters.AddWithValue(\"@Image\",Image);
    cmd.Parameters.AddWithValue(\"@Ranswer\",Ranswer);
    cmd.Parameters.AddWithValue(\"@Fanswer1\",Fanswer1);
    cmd.Parameters.AddWithValue(\"@Fanswer2\",Fanswer2);
    cmd.Parameters.AddWithValue(\"@Fanswer3\",Fanswer3);

    if (con.State != ConnectionState.Open)
    {
        con.Open();
        result = cmd.ExecuteNonQuery();
        con.Close();
    }
    return result;
}

    ,        结果仍然为0； 我知道问题出在哪里。 如果连接关闭，查询将成功执行，但如果打开，由于这种情况将不会执行查询。

if (con.State != ConnectionState.Open)
{
    con.Open();
    result = cmd.ExecuteNonQuery();
    con.Close();
}

一定是

if (con.State != ConnectionState.Open)
{
    con.Open();
}
    result = cmd.ExecuteNonQuery();
    con.Close();

谢谢大家。