类型＆＃39; System.Data.OleDb.OleDbException＆＃39;的未处理异常发生在System.Data.dll中。来自Access的字符串

Question

＆＃34;未处理的类型＆＃39; System.Data.OleDb.OleDbException＆＃39;发生在System.Data.dll

中

其他信息：标准表达式中的数据类型不匹配。＆＃34;

OleDbCommand commandmenu = new OleDbCommand();
        commandmenu.Connection = oleConn;
        string querymenu = "select * from AllMeals where MOTD = '1'";
        commandmenu.CommandText = querymenu;
        string menutype = "";
        string menuitemname = "";
        OleDbDataReader readermenu = commandmenu.ExecuteReader();
        while (readermenu.Read())
        {
            menutype = readermenu.GetString(3);
            menuitemname = readermenu.GetString(1);
        }

我试图从我的访问数据库中获取字符串，但是我收到此错误，我的查询文本有问题吗？ MOTD是AllMeals表中的是/否字段。

Answer 1

您的查询存在问题。试试这个：

    string querymenu = "select * from AllMeals where MOTD ="+ true;

Answer 2

删除single quotes

string querymenu = "select * from AllMeals where MOTD = 1";