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Interaction with the SQL Server Environment
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Another common use for SQL Mail is for processing mail that contains database queries. Remote users can send queries to the SQL Server and have it return resultsets to them. SQL Server can also send messages that include resultsets in the form of a report to one or more users. Although these resultsets are rather crude (just ASCII text), it is possible to envision and create an application that uses this capability to notify management when some change occurs in the database. SQL Server 2000 and 7.0 contain two services that handle mail. The MSSQLServer service contains a component called SQL Mail that processes all extended stored procedures that use mail. SQL Server Agent contains a separate mail capability in a component often called SQLAgentMail. We will not go into detail on the implementation and configuration of these services. Refer to SQL Server Books Online and the Microsoft Support Web site for more details.
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Extended Stored Procedures for Work with E-Mail
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To implement custom behavior and features, developers need to use extended stored procedures and build their own code in the form of stored procedures. These stored procedures can be executed from a client application or in Job Scheduler. See Table 11-1 for a list of extended stored procedures for e-mail.
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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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SQL Server 2000 Stored Procedure Programming
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Extended Stored Procedure
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xp_sendmail xp_readmail xp_findnextmsg sp_processmail*
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Sends mail Returns a message in the form specified by output parameters Finds a pointer to the next mail message Reads incoming mail messages with queries in them. Returns the resultsets 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
xp_deletemail xp_startmail xp_stopamail
*Actually, sp_processmail is a Transact-SQL system stored procedure, not an extended stored procedure.
Table 11-1.
Extended Stored Procedures for Work with E-Mail
NOTE: 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.
The next example sends the resultset 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:
Exec xp_sendmail @recipients = 'SQLAdmin', @query = 'DBCC SQLPERF (LogSpace)'
A query can be returned in the form of an attached file:
11:
Interaction with the SQL Server Environment
Exec xp_sendmail @recipients = 'SQLAdmin; NetAdmin', @query = 'DBCC SQLPERF (LogSpace)', @subject = 'Transaction Log usage', @attach_results = 'TRUE'
Attachment files are also used to overcome the message size limit of 8,000 characters:
create table #Message(msg text) Insert into #Message 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 an elaborate recordset with an elaborate list of messages. The resultset will contain fields to identify:
w s s s
Message ID Subject Body of message Sender
SQL Server 2000 Stored Procedure Programming
s s s s s v
cc list bcc lists Attachments Date received Read status Message type
To read a single message, you have to specify the @messageid parameter. You get it either from the previous list or by using the xp_findnextmsg extended stored procedure.
EXEC @status = 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 read messages only in segments that are not longer than 255 characters. Two parameters control where to start reading and the length of the message. Using them, you can implement a loop that will read the whole message. See SQL Server Books Online for an example of such a procedure.
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