Question

我想在电子邮件正文中插入数据库内容，数据阅读器的索引0包含每个电子邮件地址的ID号，我想使用在邮件正文中添加ID号来发送邮件，例如：雇员ID为5。我需要在同一行中存在的每个邮件正文中插入每个id。我已使用此代码在正文中插入ID，但这没用

message.Body = "The Employee id is 5  "+reader[1].ToString();

完整代码是：

MailMessage message = new MailMessage();
message.Subject = "Employee Access ";

message.From = new MailAddress("avvv@gmail.com");
var fromAddress = "avvv@gmail.com";
const string fromPassword="password";
var smtp = new System.Net.Mail.SmtpClient();
{
    smtp.Host = "smtp.gmail.com";
    smtp.EnableSsl = true;
    smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
    smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
    smtp.Timeout = 20000;


    OleDbCommand cmd = null;
    OleDbCommand cmd2 = null;

    string queryString = "select id,email,status from tableemail";
    using (OleDbConnection connection = new OleDbConnection("Provider = OraOLEDB.Oracle.1; Data Source = xe;
    Password=654321;User ID = xpress; unicode=true"))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        cmd = new OleDbCommand(queryString);
        cmd.Connection = connection;
        OleDbDataReader reader = cmd.ExecuteReader();

        while (reader.Read())
        {
            MailAddress to = new MailAddress(reader[1].ToString());
            message.To.Add(to);   
        }

        message.Body = "The Employee id is 5  "+reader[1].ToString();
        smtp.Send(message);
        reader.Close();
    }
}

我可以使用数据读取器在正文中插入多个数据库字段吗？

Answer 1

我不确定您的代码到底需要什么功能，但是据我了解，您可以这样做。使用DataTable

    DataTable dataTable = new DataTable();
    MailMessage message = new MailMessage();
    message.Subject = "Employee Access ";

    message.From = new MailAddress("avvv@gmail.com");
    var fromAddress = "avvv@gmail.com";
    const string fromPassword = "password";


    OleDbCommand cmd = null;

    string queryString = "select id,email,status from tableemail";
    using (OleDbConnection connection = new OleDbConnection("Provider = OraOLEDB.Oracle.1; Data Source = xe; Password = 654321; User ID = xpress; unicode = true"))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        cmd = new OleDbCommand(queryString);
        cmd.Connection = connection;
        OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
        adapter.Fill(dataTable);
        adapter.Dispose();
    }

    foreach (DataRow dataRow in dataTable.Rows)
    {
        var smtp = new System.Net.Mail.SmtpClient();
        {
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
            smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
            smtp.Timeout = 20000;

            MailAddress to = new MailAddress(dataRow[1].ToString());

            if (!message.To.Contains(to))
            {
                    message.To.Add(to);
            }

            message.Body = "The Employee id is 5  " + dataRow[0].ToString();
            smtp.Send(message);
        }
    }

Answer 2

我认为问题是您在读取最后一条记录后正在调用DataReader。 Reader.Read（）返回false，表示reader[1]应该抛出错误，因为没有要读取的内容。

我不知道您是否想要电子邮件正文中的每个值，还是只想要最后一个...假设您想要每个值，类似的东西应该可以工作：

using (OleDbConnection connection = new OleDbConnection(cs))
{
    connection.Open();

    using (OleDbCommand cmd = new OleDbCommand(queryString, connection))
    {
        using (OleDbDataReader reader = cmd.ExecuteReader())
        {
            StringBuilder body = new StringBuilder();

            while (reader.Read())
            {
                string to = reader.GetString(0);
                message.To.Add(to);
                body.AppendFormat("The Employee id is 5 {0}<br>", to);
            }

            message.Body = body.ToString();
            reader.Close();
        }
    }
}
smtp.Send(message);

如果您真的只想要最后一个（正如您的原始代码所暗示的那样），我只需将其保存在循环中的本地字符串中，然后在阅读器循环之后将其添加。

在一个不相关的问题上，您将实例化OLE Command对象两次。我在上面的代码片段中删除了重复项。

如何在邮件正文中插入数据库值或字符串

2 个答案: