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DBConnect.cs
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DBConnect.cs
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/****************************** Module Header ******************************
* Module Name: CorpMailman Windows Service project.
* Project: CorpMailman: Windows Service to send out emails project.
*
* DBConnect class to interface with MySQL backend and run procedures.
*
* Revisions:
* 1. Sundar Krishnamurthy sundar_k@hotmail.com 8/27/2015 Initial file created.
***************************************************************************/
namespace CorpMailman {
#region Using directives
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.Linq;
using System.Text;
using MySql.Data.MySqlClient;
#endregion
#region DBConnect class
/// <summary>
/// DBConnect class - interface with MySQL backend and run procedures
/// </summary>
internal class DBConnect {
#region Members
/// <summary>MySqlConnection to DB</summary>
private MySqlConnection connection;
#endregion
#region Constructor
/// <summary>
/// Default Constructor
/// </summary>
internal DBConnect() {
this.Initialize();
}
#endregion
#region Methods
#region Public/internal Methods
/// <summary>
/// Get Next Mail to send out
/// </summary>
internal Mail GetNextMailToSend() {
var mail = null as Mail;
if (this.OpenConnection()) {
string query = Constants.Table.Queries.GetEmailToSend;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
// Create a data reader and Execute the command
MySqlDataReader dataReader = cmd.ExecuteReader();
// Read the data and store them in the list
if (dataReader.Read()) {
mail = new Mail();
mail.MailId = dataReader[Constants.Table.Mails.MailId] as uint?;
mail.From = dataReader[Constants.Table.Mails.Sender] as string;
mail.ToAddresses = dataReader[Constants.Table.Mails.Recipients] as string;
mail.CcAddresses = dataReader[Constants.Table.Mails.CcRecipients] as string;
mail.BccAddresses = dataReader[Constants.Table.Mails.BccRecipients] as string;
mail.Subject = dataReader[Constants.Table.Mails.Subject] as string;
mail.SubjectPrefix = dataReader[Constants.Table.Mails.SubjectPrefix] as string;
mail.Body = dataReader[Constants.Table.Mails.Body] as string;
mail.HasAttachments = (dataReader[Constants.Table.Mails.HasAttachments] as byte?).GetValueOrDefault() == 1;
mail.Created = (DateTime)dataReader[Constants.Table.Mails.Created];
mail.Direct = (dataReader[Constants.Table.Mails.Direct] as byte?).GetValueOrDefault() == 1;
mail.Importance = (dataReader[Constants.Table.Mails.Importance] as byte?).GetValueOrDefault() == 1;
}
//close Connection
this.CloseConnection();
}
// Read attachments for this mail, if you have any!
if ((mail != null) && (mail.HasAttachments.GetValueOrDefault())) {
if (this.OpenConnection()) {
string query = Constants.Table.Queries.GetAttachmentsForEmail;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.MailId, mail.MailId);
// Create a data reader and Execute the command
MySqlDataReader dataReader = cmd.ExecuteReader();
// Read the data and store them in the list
while (dataReader.Read()) {
var attachment = new MailAttachment();
attachment.MailId = dataReader[Constants.Table.Mails.MailId] as uint?;
attachment.Filename = dataReader[Constants.Table.Attachments.Filename] as string;
attachment.Filesize = dataReader[Constants.Table.Attachments.Filesize] as uint?;
attachment.Bytes = dataReader[Constants.Table.Attachments.Attachment] as byte[];
mail.AddAttachment(attachment);
}
//close Connection
this.CloseConnection();
}
}
return mail;
}
/// <summary>
/// Save this email to database
/// </summary>
/// <param name="mail">Mail object</param>
internal void SaveEmail(Mail mail) {
if (this.OpenConnection()) {
var query = Constants.Table.Queries.AddEmail;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Sender, mail.Direct ? DBNull.Value : mail.From as object);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Recipients, mail.ToAddresses);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.CcRecipients, string.IsNullOrEmpty(mail.CcAddresses) ? DBNull.Value : mail.CcAddresses as object);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.BccRecipients, string.IsNullOrEmpty(mail.BccAddresses) ? DBNull.Value : mail.BccAddresses as object);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Subject, mail.Subject);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.SubjectPrefix, string.IsNullOrEmpty(mail.SubjectPrefix) ? DBNull.Value : mail.SubjectPrefix as object);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Body, mail.Body);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.MarkMailAsReady, mail.MarkMailAsReady);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.HasAttachments, mail.HasAttachments);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Importance, mail.Importance);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Direct, mail.Direct);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Timestamp, mail.Timestamp.HasValue ? mail.Timestamp.GetValueOrDefault() as object : DBNull.Value);
// Execute Scalar - don't bother reading the mail attachment ID
mail.MailId = (uint)((cmd.ExecuteScalar() as ulong?).GetValueOrDefault());
//close Connection
this.CloseConnection();
}
}
/// <summary>
/// Get Next Mail to send out
/// </summary>
/// <param name="attachment">MailAttachment object</param>
internal void SaveAttachment(MailAttachment attachment) {
if (this.OpenConnection()) {
string query = Constants.Table.Queries.AddMailAttachment;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.MailId, attachment.MailId);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Filename, attachment.Filename);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Filesize, attachment.Filesize);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.Attachment, attachment.Bytes);
// Execute Scalar - don't bother reading the mail attachment ID
cmd.ExecuteScalar();
//close Connection
this.CloseConnection();
}
}
/// <summary>
/// Mark email as ready to be processed in the Database
/// </summary>
/// <param name="mailId">Mail ID</param>
internal void MarkEmailAsReady(uint mailId) {
if (this.OpenConnection()) {
string query = Constants.Table.Queries.MarkEmailAsReady;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.MailId, mailId);
// Execute Non-Query
cmd.ExecuteNonQuery();
//close Connection
this.CloseConnection();
}
}
/// <summary>
/// Delete this email from Database
/// </summary>
/// <param name="mailId">Mail ID</param>
internal void DeleteEmail(uint mailId) {
if (this.OpenConnection()) {
string query = Constants.Table.Queries.DeleteEmail;
// Create Command
MySqlCommand cmd = new MySqlCommand(query, connection);
cmd.Parameters.AddWithValue(Constants.Table.Queries.Parameters.MailId, mailId);
// Execute Non-Query
cmd.ExecuteNonQuery();
//close Connection
this.CloseConnection();
}
}
#endregion
#region Private Methods
/// <summary>
/// Initialize DBConnect instance
/// </summary>
private void Initialize() {
// Construct MySqlConnection instance, specified by connection string
this.connection = new MySqlConnection(ConfigData.Instance.ConnectionString);
}
/// <summary>
/// Open connection
/// </summary>
/// <returns>True if connection succeeded, false otherwise</returns>
private bool OpenConnection() {
bool connected = false;
try {
this.connection.Open();
connected = true;
} catch (MySqlException ex) {
//When handling errors, you can your application's response based
//on the error number.
//The two most common error numbers when connecting are as follows:
//0: Cannot connect to server.
//1045: Invalid user name and/or password.
switch (ex.Number) {
case 0:
// Fail if you cannot connect to the backend database
throw new CorpMailmanException(Constants.Messages.Database.CannotConnect, ex);
case 1045:
// Fail if the username password combination is invalid to the database
throw new CorpMailmanException(Constants.Messages.Database.InvalidCredentials, ex);
}
}
return connected;
}
/// <summary>
/// Close connection
/// </summary>
private void CloseConnection() {
this.connection.Close();
}
#endregion
#endregion
}
#endregion
}