C# 如何更新访问 table

Question

多列的UPDATE语句应该如何处理，必须更新吗？（因为一行里面改了很多）

我在这个版块上尝试了一些搜索，但在其他问题中，有时列周围是“[]”，有时不是，但这两个版本在我的代码中都不起作用。

代码如下：

            try 
            {
                string name = mtb_Name.Text.ToString();
                string altname = mtb_AltName.Text.ToString();
                string licht = cb_Licht.SelectedItem.ToString();
                string boden = cb_Boden.SelectedItem.ToString();
                string haerte = cb_Haerte.SelectedItem.ToString();
                string pg = cb_PG.SelectedItem.ToString();
                string hoehe = mtb_Hoehe.Text.ToString();
                string form = cb_Form.SelectedItem.ToString();
                string zuechter = cb_Zuechter.SelectedItem.ToString();
                string land = cb_Land.SelectedItem.ToString();
                string gruppe = cb_Gruppe.SelectedItem.ToString();

//the connection works, I can add stuff in other tables and delete stuff everywhere

                parent.GetDBConnection().Open();
                OleDbCommand Query = new OleDbCommand();
                Query.Connection = parent.GetDBConnection();
                Query.Parameters.Clear();

//I build this string at the moment for testing purposes only and 
//converted everything and putted in a string to be sure.
//later it will be replaced with the Parameters.Add(,)
//I also did test it with [AltNameRose] as columname instead of AltNameRose
//or wrote instead of the ' ' a "\"" around the strings, 
//but doesn´t seem to be the problem.

                Query.CommandText = "UPDATE tb_Rose SET" +
                    " ,AltNameRose = '" + altname +
                    "' ,NameZuechter = '" + haerte +
                    "' ,Boden = '" + boden +
                    "' ,Wuchshoehe = '" + hoehe +
                    "' ,Farbe = '" + " " +
                    "' ,Foto = '" + " " +
                    "' ,Licht = '" + licht +
                    "' ,Preisgruppe = '" + pg +
                    "' ,Gruppe = '" + gruppe +
                    " WHERE NameRose = '" + name + "'";

//the CommandText seems to be missing something, but I don´t know what.

                MessageBox.Show(Query.CommandText.ToString());
                Query.ExecuteNonQuery();
                parent.GetDBConnection().Close();
                MessageBox.Show("Rose successfully edited.");
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                parent.GetDBConnection().Close();
            }

抛出的异常是

"Syntaxerror in UPDATE-Command

table tb_Rose 看起来像这样： NameRose|AltNameRose|NameZuechter|Frosthaerte|Boden|Wuchshoehe|Farbe|Foto||Licht|Preisgruppe|Gruppe

另一个问题是，命令，我如何通过专栏也很重要，但它不适合我。

有没有人给个小提示哪里有错误？

Answer 1

您不需要在第一列前逗号只是。这就是为什么你的;

" ,AltNameRose = '"

应该是

" AltNameRose = '"

但更重要的是，您应该始终使用 parameterized queries. This kind of string concatenations are open for SQL Injection 攻击。

还可以使用 using statement 自动处理您的连接和命令，而不是手动调用 .Close() 方法。

Answer 2

更新语句的语法是

Update table_name SET
                  column_name = value,
                  column_name = value,
                  ....
                  Where condition

在您的查询中，您在 SET 关键字后放置了一个 ,。

SET 关键字后有一个 ,.. 试试下面的代码

Query.CommandText = "UPDATE tb_Rose SET" +
                    " AltNameRose = '" + altname +
                    "' ,NameZuechter = '" + haerte +
                    "' ,Boden = '" + boden +
                    "' ,Wuchshoehe = '" + hoehe +
                    "' ,Farbe = '" + " " +
                    "' ,Foto = '" + " " +
                    "' ,Licht = '" + licht +
                    "' ,Preisgruppe = '" + pg +
                    "' ,Gruppe = '" + gruppe +
                    " WHERE NameRose = '" + name + "'";

C# 如何更新访问 table

C# How to update an access table

c#

database

ms-access-2010