0

起初我试过这个:

    string set = "";
    for (int i = 1; i < result.Count; i++)
    {
        if ((fieldtypes[i] == "System.Int32"))
        {
            set += fields[i] + "=" + result[i] + ", ";
        }
        else if (fieldtypes[i] == "System.String")
        {
            set += fields[i] + "='" + result[i] + "', ";
        }
        else if (fieldtypes[i] == "System.Boolean")
        {
            set += fields[i] + "=" + result[i] + ", ";
        }
        else if (fieldtypes[i] == "System.DateTime")
        {
            set += fields[i] + "='#" + System.DateTime.Now + "#', ";
        }
    }
    set = set.Substring(0, set.Length - 2);
    string sql11 = "UPDATE [Contacts] SET " + set + " WHERE pkContactID=" + cKey;
    OleDbCommand myCommand11 = new OleDbCommand(sql11, myConnection);
    myCommand11.ExecuteNonQuery();

现在,当我省略了字符串和日期时间条件以便它只更新 int 和 boolean 时,这可以工作。因此,当我尝试更新类型为字符串的字段时,它与语法错误有关。


然后我听说写入.mdb文件时必须使用参数,所以我尝试了这个:

        string sql11 = "UPDATE [Contacts] SET ";
        for (int i = 1; i < result.Count; i++)
        {
            sql11 += fields[i] + " = ?, ";
        }
        sql11 = sql11.Substring(0, sql11.Length - 2);
        sql11 += " WHERE pkContactID = " + cKey;
        using (myConnection)
        {
            using (OleDbCommand myCommand11 = new OleDbCommand(sql11, myConnection))
            {
                myCommand11.CommandType = CommandType.Text;
                for (int j = 1; j < result.Count; j++)
                {
                    if (fieldtypes[j] == "System.Int32")
                    {
                        myCommand11.Parameters.AddWithValue(fields[j], int.Parse(result[j]));
                    }
                    else if (fieldtypes[j] == "System.String")
                    {
                        myCommand11.Parameters.AddWithValue(fields[j], result[j]);
                    }
                    else if (fieldtypes[j] == "System.Boolean")
                    {
                        myCommand11.Parameters.AddWithValue(fields[j], Boolean.Parse(result[j]));
                    }
                    else if (fieldtypes[j] == "System.DateTime")
                    {
                        myCommand11.Parameters.AddWithValue(fields[j], DateTime.Now);
                    }
                }
                Console.WriteLine(sql11);
                myCommand11.ExecuteNonQuery();
            }
        }
    }

这也不起作用。我认为 ? 没有被正确替换。

无论如何,请帮我修复它,以便我可以正确更新。

4

1 回答 1

0

我不必弄乱 Access 的 UPDATE 查询字符串(这很容易出现语法错误),而是创建了一个 DataTable 对象并选择了我想要更新的行。然后,我通过要更改的元素数组更新了表格,然后使用适配器将表格更新回服务器。这很好用,不用我担心语法!:)

干杯

于 2013-01-23T20:31:32.327 回答