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7.8

prevent concurrent read in sms gateway application

Asked by wuyinzhi in Visual Basic Programming

Tags: sms, visual basic

dear experts,

i have a sms gateway application (using GSM modem) with vb, i prepare a table in MS SQL called outbox with these fields:

id -> increment id = 1,1
phone -> recipient no
message -> message to send
datetime

after send a record, the application will move the record into SentItem table.

I run the application in 2 different PC with each GSM modem, let's say app A and app B, but the problem is sometimes the application read the same record in the same time, caused the recipient receive double SMS. So my question is how to lock the record FOR READ, for example i have 3 records:

message 1 -> app A read this, lock it, so app B can't read
message 2 -> app B read this because it can't read message 1
message 3 -> and so on...

my code as follows:

View the Solution FREE for 30 Days

         
             sql = "SELECT DISTINCT TOP 1  ID,phone,message FROM outbox ORDER BY Datetime"
rs.Open sql, mdlInit.conn, adOpenForwardOnly, adLockReadOnly
 
'--- process sending SMS
 
rs.close

20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625

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prevent concurrent read in sms gateway application

Asked by wuyinzhi in Visual Basic Programming

Tags: sms, visual basic

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