使用访问数据库更新声明不起作用 [英] working with access database update statment not working

问题描述

string date=
DateTime.Now.ToString("d.M.yyyy",System.Globalization.DateTimeFormatInfo.InvariantInfo);

String MyString = @"UPDATE cas SET Odhod= '" + label1.Text + "' 
WHERE sifra = " + textBox1.Text + " and Datum = "+date+"";

当我在没有Datum的情况下执行此更新时，它可以工作，但在Datum中不起作用.我已连接到Access数据库，表中的Datum字段类型为日期/时间，请帮忙.

When I do thise update without Datum it works, but with Datum doesn't work. I'm connected to accesss database, and Datum field type in table is date/time Guys please help.

该程序是: https://www. dropbox.com/s/hx4zduvul8mh2uy/8.4.zip

问题所在: http://img43.imageshack.us/img43/5189/errorbh.jpg

推荐答案

像往常一样，使用字符串连接会带来很多麻烦.
(Sql注入，解析问题)

As usual, using string concatenation brings in a lot of trouble.
(Sql Injection, Parsing problems)

只需使用参数化查询

string MyString = @"UPDATE cas SET Odhod= ? WHERE sifra = ? and Datum = ?"; 


using(OleDbConnection cn = new OleDbConnection(connectionstring))
using(OleDbCommand cmd = new OleDbCommand(MyString, cn)
{
    cn.Open();
    cmd.Parameters.AddWithValue("@p1", label1.Text);
    cmd.Parameters.AddWithValue("@p2", textbox.Text);
    cmd.Parameters.AddWithValue("@p3", Convert.ToDate(date));
    cmd.ExecuteNonQuery();
}

当然，存储在基准"字段中的日期"值应与参数@ p3中传递的日期完全相同.有时最好在您的日期中添加时间值

Of course, the Date value stored in the Datum field should be exactly like the date passed in parameter @p3. Sometime it is good to add also the time value to your date

string date= DateTime.Now.ToString("d.M.yyyy 00:00:00", ......);

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