47 lines
2 KiB
Plaintext
47 lines
2 KiB
Plaintext
|
Sample: MQTRANS
|
||
|
|
|
||
|
|
Purpose:
|
||
|
|
C++ console app that demonstrates how to send/receive coordinated transactions that include MSMQ messages and SQL
|
||
|
|
database updates. In this case, sums of money are transferred between the sender and the receiver via messages and
|
||
|
|
each transaction sum is recorded in a database.
|
||
|
|
|
||
|
|
Requirements:
|
||
|
|
MSMQ1.0 or later
|
||
|
|
SQL 6.5
|
||
|
|
ODBC
|
||
|
|
DS enabled computer (application fails and exits if local computer is DS disabled)
|
||
|
|
|
||
|
|
Before running the sample, you must add MSMQDemo as DSN:
|
||
|
|
Control Panel - Administrative tools - Data Sources (ODBC) - User DSN -
|
||
|
|
- add - SqlServer - DataSourceNAme=MSMQDemo, Server=Local
|
||
|
|
|
||
|
|
Overview:
|
||
|
|
The mqtrans application takes a single param: either "-s" or "-r". Where "-s" specifies a sending instance of the application
|
||
|
|
and "-r" specifies a receiving instance.
|
||
|
|
|
||
|
|
A sending instance of the applications performs the following steps:
|
||
|
|
1. Creates a new database table "SenderAccount".
|
||
|
|
2. Locates a MSMQ queue of type MQTransTest and opens it. For simplicity, this sample assumes there's only
|
||
|
|
one queue of this type. Note that the sample will fail if this assumption is wrong.
|
||
|
|
3. In a loop:
|
||
|
|
Prompts the user to enter TransferSum.
|
||
|
|
Creates a transaction using MS DTC.
|
||
|
|
Within the transaction:
|
||
|
|
Updates "SenderAccount" database (subtracts TransferSum).
|
||
|
|
Sends a message to Receiver side.
|
||
|
|
Commits the transaction.
|
||
|
|
The loop is terminated if the user enters a zero TransferSum.
|
||
|
|
4. Cleanup.
|
||
|
|
|
||
|
|
A receiving instance of the application does the following:
|
||
|
|
1. Creates database "ReceiverAccount".
|
||
|
|
2. Creates a MSMQ a local public queue (with the Transactional property) of type MQTransTest and opens it.
|
||
|
|
3. In a loop:
|
||
|
|
Creates a transaction using MS DTC.
|
||
|
|
Within the transaction:
|
||
|
|
Receives a message from the queue (with the TransferSum).
|
||
|
|
Updates "ReceiverAccount" database (adds TransferSum).
|
||
|
|
Commits the transaction.
|
||
|
|
4. Cleanup.
|
||
|
|
|