internal Message GetLockMessage(int messageId)
{
// TODO: lock the message so that one message can't be processed twice
string query = "SELECT * FROM queuemessage WHERE id = ?id";
MySqlCommand command = new MySqlCommand(query, connection);
command.Parameters.AddWithValue("?id", messageId);
Message result;
using (MySqlDataReader reader = command.ExecuteReader())
{
if (reader.Read())
{
result = new Message();
result.FillFromReader(reader);
}
else
{
// No more messages to process
result = null;
}
}
return result;
}
public static int SaveMessage(Message message)
{
int result;
using (QueueDBWriteInterface db = new QueueDBWriteInterface())
{
result = db.SaveMessage(message);
}
return result;
}
internal Message GetLockTopMessage()
{
MySqlCommand command = new MySqlCommand("queue_getLockMessage", connection);
command.CommandType = System.Data.CommandType.StoredProcedure;
Message result;
using (MySqlDataReader reader = command.ExecuteReader())
{
if (reader.Read())
{
result = new Message();
result.FillFromReader(reader);
}
else
{
// No more messages to process
result = null;
}
}
return result;
}
internal int SaveMessage(Message message)
{
// Verify that the message doesn't already exist
string query;
if (message.ValidDate != null)
{
query = "SELECT id FROM queuemessage WHERE action = ?action AND mainId = ?mainId AND secondaryId = ?secondaryId AND validDate=?validDate";
}
else
{
query = "SELECT id FROM queuemessage WHERE action = ?action AND mainId = ?mainId AND secondaryId = ?secondaryId AND validDate IS NULL";
}
var command = new MySqlCommand(query, connection);
command.Parameters.AddWithValue("?action", message.Action);
command.Parameters.AddWithValue("?mainId", message.MainId);
command.Parameters.AddWithValue("?secondaryId", message.SecondaryId);
command.Parameters.AddWithValue("?validDate", message.ValidDate);
using( MySqlDataReader reader = command.ExecuteReader() )
{
if( reader.HasRows )
{
throw new Exception( String.Format("Message with action '{0}', main id {1} secondary Id {2} already exists", message.Action, message.MainId, message.SecondaryId ) );
}
}
query = "INSERT INTO queuemessage (Action, MainId, SecondaryId, DateAdded, Priority, ValidDate ) VALUES( ?Action, ?MainId, ?SecondaryId, ?DateAdded, ?Priority, ?ValidDate )";
command = new MySqlCommand(query, connection);
message.FillCommandParameters(command);
// command.Parameters.AddWithValue("?tableName", Config.TableName);
command.Parameters.AddWithValue("?dateAdded", DateTime.Now);
command.ExecuteNonQuery();
query = "SELECT LAST_INSERT_ID() FROM queuemessage LIMIT 0, 1";
command = new MySqlCommand(query, connection);
int messageId = Convert.ToInt32(command.ExecuteScalar());
return messageId;
}
