[英]How to update database record vs12 C#
嗨,我在為網站設置更新按鈕時遇到了麻煩,我嘗試了許多方法,但似乎無法弄清楚。 我希望用戶輸入要更新的客戶端的ID號,然后根據要更改的列填寫文本框。
這是我的代碼:
private static OleDbConnection GetConnection()
{
String connString;
connString = @"Provider=Microsoft.JET.OLEDB.4.0;Data Source=C:\Users\Wisal\Documents\Visual Studio 2012\WebSites\WebSite3\registration-Db.mdb";
return new OleDbConnection(connString);
}
protected void clientUpdate_Click(object sender, EventArgs e)
{
OleDbConnection cn = new OleDbConnection("Provider=Microsoft.JET.OLEDB.4.0;Data Source=C:/Users/Wisal/Documents/Visual Studio 2012/WebSites/WebSite3\registration-Db.mdb");
cn.Open();
OleDbCommand cmd = new OleDbCommand("(Update client set id = " + txt_id.Text + " ,[name] ='" + txt_name.Text + " ,[password] ='" + txt_password.Text +" where id= '" + txt_id.Text + "",cn);
cmd.ExecuteNonQuery();
cn.Close();
}
}
我也嘗試過這個:
private static OleDbConnection GetConnection()
{
String connString;
connString = @"Provider=Microsoft.JET.OLEDB.4.0;Data Source=C:\Users\Wisal\Documents\Visual Studio 2012\WebSites\WebSite3\registration-Db.mdb";
return new OleDbConnection(connString);
}
protected void clientUpdate_Click(object sender, EventArgs e)
{
OleDbConnection myConnection = GetConnection();
myConnection.Open();
OleDbCommand cmd = new OleDbCommand("(Update client set id = " + txt_id.Text + " ,[name] ='" + txt_name.Text + " ,[password] ='" + txt_password.Text +" where id= '" + txt_id.Text + "",myConnection);
cmd.ExecuteNonQuery();
myConnection.Close();
}
}
有了這個,我得到“聯合查詢中的語法錯誤”。
我也嘗試過這個:
protected void clientUpdate_Click(object sender, EventArgs e)
{
OleDbConnection myConnection = GetConnection();
myConnection.Open();
OleDbCommand cmd = new OleDbCommand("Update client set [name] = ? [password] = ? where id= ?", myConnection);
cmd.Parameters.AddWithValue("", txt_id.Text);
cmd.Parameters.AddWithValue("", txt_name.Text);
cmd.Parameters.AddWithValue("", txt_password.Text);
cmd.ExecuteNonQuery();
myConnection.Close();
}
}
我已經稍微更新了您的代碼:
private static OleDbConnection GetConnection()
{
var connString = @"Provider=Microsoft.JET.OLEDB.4.0;Data Source=C:\Users\Wisal\Documents\Visual Studio 2012\WebSites\WebSite3\registration-Db.mdb";
return new OleDbConnection(connString);
}
protected void clientUpdate_Click(object sender, EventArgs e)
{
using(var myConnection = GetConnection())
{
myConnection.Open();
// You should be using a parameterized query here
using (var cmd = new OleDbCommand("Update client set [name] = ?, [password] = ? where id = ?", myConnection))
{
cmd.Parameters.AddWithValue("name", txt_name.Text);
cmd.Parameters.AddWithValue("password", txt_password.Text);
cmd.Parameters.AddWithValue("id", txt_id.Text);
cmd.ExecuteNonQuery();
}
}
}
您的單引號不匹配?
您的id
字段是int類型還是字符串類型? 我認為它是int類型的。 而且您不需要更新id
字段,因為它與where子句中的值相同。
試試這個:
OleDbCommand cmd = new OleDbCommand("Update client set [name] ='" + txt_name.Text + "' ,[password] ='" + txt_password.Text +"' where id= " + txt_id.Text,myConnection);
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