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This stored procedure can send a text message and/or query result to the list of recipients. The following statement will notify an administrator that the transaction log is almost full:
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EXEC xp_sendmail @recipients = 'SQLAdmin', @Message = 'The transaction log of Asset database is over 95% full.'
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You cannot use e-mail addresses in the @recipients parameter. The stored procedure expects the name of a contact that is defined in the address book of an e-mail client application.
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The next example sends the result set of the query to the receiver. It could be a job that periodically lists all databases and their log usage and sends this information to the database administrator:
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Exec xp_sendmail @recipients = 'SQLAdmin', @query = 'DBCC SQLPERF (LogSpace)'
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A query can be returned in the form of an attached file:
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Exec xp_sendmail @recipients = 'SQLAdmin; NetAdmin', @query = 'DBCC SQLPERF (LogSpace)', @subject = 'Transaction Log usage', @attach_results = 'TRUE'
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Attachment files are also used to overcome the message size limit of 8000 characters:
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create table #Message(msg text) Insert into #Message
10: Interaction with the SQL Server Environment
values ('You can put more then 8000 chrs in a text field.') Exec xp_sendmail @recipients = 'SQLAdmin; NetAdmin', @query = 'select * from #Message', @attach_results = 'TRUE' drop #Message
xp_readmail
This extended stored procedure can be used to Read a single message Return a list of e-mail messages and their contents When the stored procedure is executed without a specified @messageid parameter, SQL Server will return a recordset that contains a list of all messages in the SQL Server mailbox. The result set will contain fields to identify the following: Message ID Subject Body of message Sender Recipient list
Extended Stored Procedure
xp_sendmail xp_readmail xp_findnextmsg sp_processmail* xp_deletemail xp_startmail xp_stopamail
Sends e-mail Returns a message in the form specified by output parameters Finds a pointer to the next e-mail message Reads incoming e-mail messages with queries in them; returns the result sets to the message senders Deletes a message from the inbox Runs an administrative procedure that starts SQL Mail Runs an administrative procedure that stops SQL Mail
*Actually, sp_processmail is a Transact-SQL system stored procedure, not an extended stored procedure.
Table 10-1
Extended Stored Procedures for Working with E-Mail
SQL Server 2000 Stored Procedure & XML Programming
CC list BCC list Attachments Date received Read status Message type To read a single message, you must specify the @messageid parameter. You can retrieve this ID either from the previous list or by using the xp_findnextmsg extended stored procedure.
EXEC @intStatus = xp_findnextmsg @msg_id = @intMessageId OUTPUT EXEC @intStatus = xp_readmail @msg_id = @intMessageId, @originator = @chvOriginator OUTPUT, @cc_list = @chvCC OUTPUT, @bcc_list = @chvBCC OUTPUT, @subject = @chvSubject OUTPUT, @message = @query OUTPUT
Unfortunately, this extended stored procedure can only read messages in segments that are no longer than 255 characters. Two parameters control where to start reading and the length of the message. Using these parameters, you can implement a loop that will read the whole message. See SQL Server Books Online for an example of such a procedure.
sp_processmail
This system stored procedure reads e-mail messages from the inbox, executes the queries specified in them, and returns a result set to the sender and all recipients specified on the CC list. It is usually used internally within a job that is periodically executed on the SQL Server. The following statement can be placed in the Job Scheduler and executed periodically to process e-mail that contains the string 'Asset' in the subject against the Asset database. A result set is returned in the form of a comma-separated value (CSV) attachment file:
exec sp_processmail @Subject = 'Asset', @filetype = 'CSV', @separator = ',', @dbuse = 'Asset'
10: Interaction with the SQL Server Environment
The sp_processmail stored procedure uses xp_readmail, xp_deletemail, xp_findnextmsgl, and xp_sendmail to process messages.
Open this stored procedure and study its code. It is a good example of Transact-SQL code.
Security
Implementing security on SQL Server is not difficult, but you need to have a good understanding of its security architecture before you can define and implement an effective and manageable security solution.
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