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