[英]Deleting multiple rows from a table
I have a table and I want to delete all rows with a specific card serial . 我有一个表,我想删除具有特定卡序列的所有行。 There are multiple rows with the same card serial .So I wrote this code but it seems that's not working: 有多个行具有相同的卡序列。所以我写了这段代码,但似乎不起作用:
try
{
using (SqlConnection con = new SqlConnection(WF_AbsPres.Properties.Settings.Default.DbConnectionString))
{
con.Open();
SqlCommand command2 = new SqlCommand("DELETE FORM DevInOut where Cardserial='" + textBox5.Text + "'", con);
command2.ExecuteNonQuery();
con.Close();
}
}
catch (SqlException ex)
{
}
how can assure all the rows will be deleted . 如何确保删除所有行。 Should I use procedure? 我应该使用程序吗? How do I use procedure? 我该如何使用程序?
Change your FORM
to FROM
. 将您的FORM
更改为FROM
。
And please always use parameterized queries instead. 请始终使用参数化查询 。 This kind of string concatenations are open for SQL Injection attacks. 这种字符串连接对SQL注入攻击是开放的。
using (SqlConnection con = new SqlConnection(WF_AbsPres.Properties.Settings.Default.DbConnectionString))
{
con.Open();
SqlCommand command2 = new SqlCommand("DELETE FROM DevInOut where Cardserial=@Cardserial", con);
commdand2.Parameters.AddWithValue("@Cardserial", textBox5.Text);
command2.ExecuteNonQuery();
con.Close();
}
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