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(SQL Server) Using Replace Patterns in Email

See more Email Object Examples

Demonstrates how to use the replace patterns (mail-merge) feature in Chilkat MailMan.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

// Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
//
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @sTmp1 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @success int

    -- ---------------------------------------------------------------------
    -- Create an email template for sending.
    DECLARE @emailTemplate int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Email', @emailTemplate OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- We're going to replace "FIRST_NAME" with an actual name.
    -- We arbitrarily chose "FIRST_NAME".  We can choose anything, such as "CUSTOMER_NAME" or "THE_RECIPIENT_NAME"...
    EXEC sp_OASetProperty @emailTemplate, 'Subject', 'Hello FIRST_NAME,'

    EXEC sp_OASetProperty @emailTemplate, 'From', 'john@example.com'
    EXEC sp_OAMethod @emailTemplate, 'AddTo', @success OUT, 'FIRST_NAME', 'RECIPIENT_EMAIL'

    EXEC sp_OAMethod @emailTemplate, 'SetHtmlBody', NULL, '<html><body><h2>Hello FIRST_NAME,</h2><p>Your order for PRODUCT_NAME has been shipped.</p></body></html>'

    -- If the email is saved to a file, we can see what it contains:
    EXEC sp_OAMethod @emailTemplate, 'SaveEml', @success OUT, 'qa_output/emailTemplate.eml'

    -- For example:

    -- MIME-Version: 1.0
    -- Date: Tue, 26 Apr 2022 07:10:52 -0500
    -- Message-ID: <715CF231A9F07B0B9FDB073518CD94138D791866@XYZ>
    -- Content-Type: text/html; charset=us-ascii
    -- Content-Transfer-Encoding: 7bit
    -- X-Priority: 3 (Normal)
    -- Subject: Hello FIRST_NAME,
    -- From: john@example.com
    -- CKX-Bounce-Address: john@example.com
    -- To: FIRST_NAME <RECIPIENT_EMAIL>
    -- 
    -- <html><body><h2>Hello FIRST_NAME,</h2><p>Your order for PRODUCT_NAME has been shipped.</p></body></html>

    -- Note: Ignore the CKX-Bounce-Address header.  It is automatically removed by Chilkat prior to sending.
    -- All "CKX-" headers are automatically removed prior to sending.

    -- ---------------------------------------------------------------------
    -- Demonstrate replace patterns by setting and then rendering to MIME.

    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.MailMan', @mailman OUT

    EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'FIRST_NAME', 'Elon'
    EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'RECIPIENT_EMAIL', 'elon.musk@example.com'
    EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'PRODUCT_NAME', 'Twitter Corporation'

    -- Render to MIME to see what we get.
    -- Note: When the MailMan sends an email, it renders the email to MIME and then sends.
    -- The rendering process is to do replacements, or possibly sign, encrypt, etc.
    -- When MailMan.SendEmail is called, internally the email is rendered, and the rendered email is sent.
    -- The equivalent to MailMan.Send email is to call email.RenderToMime followed by MailMan.SendMime.
    DECLARE @mime nvarchar(4000)
    EXEC sp_OAMethod @mailman, 'RenderToMime', @mime OUT, @emailTemplate

    PRINT @mime

    -- This is the rendered MIME:

    -- MIME-Version: 1.0
    -- Date: Tue, 26 Apr 2022 07:25:49 -0500
    -- Message-ID: <750582BCDC891C67B48CEE2293C08B902C3891E9@XYZ>
    -- Content-Type: text/html; charset=us-ascii
    -- Content-Transfer-Encoding: 7bit
    -- X-Priority: 3 (Normal)
    -- Subject: Hello Elon,
    -- From: john@example.com
    -- To: Elon <elon.musk@example.com>
    -- 
    -- <html><body><h2>Hello Elon,</h2><p>Your order for Twitter Corporation has been shipped.</p></body></html>

    -- Note: When rendering, the Date and Message-ID headers are automatically regenerated.

    -- ---------------------------------------------------------------------
    -- An application can see what replacement patterns it previously set by calling SetReplacePattern multiple times.
    DECLARE @count int
    EXEC sp_OAGetProperty @emailTemplate, 'NumReplacePatterns', @count OUT

    PRINT 'Number of replace patterns: ' + @count

    DECLARE @i int
    SELECT @i = 0
    WHILE @i < @count
      BEGIN
        -- Note: The GetReplaceString method was found to not be working correctly.  It was returning the same value as GetReplacePattern.
        -- It is fixed in Chilkat v9.5.0.91
        EXEC sp_OAMethod @emailTemplate, 'GetReplacePattern', @sTmp0 OUT, @i

        EXEC sp_OAMethod @emailTemplate, 'GetReplaceString', @sTmp1 OUT, @i
        PRINT @sTmp0 + ': ' + @sTmp1
        SELECT @i = @i + 1
      END

    -- Or lookup a replacement pattern by name:
    DECLARE @name nvarchar(4000)
    SELECT @name = 'FIRST_NAME'

    EXEC sp_OAMethod @emailTemplate, 'GetReplaceString2', @sTmp0 OUT, @name
    PRINT @name + ' = ' + @sTmp0

    -- Sample output:

    -- Number of replace patterns: 3
    -- FIRST_NAME: Elon
    -- RECIPIENT_EMAIL: elon.musk@example.com
    -- PRODUCT_NAME: Twitter Corporation
    -- FIRST_NAME = Elon

    -- ---------------------------------------------------------------------
    -- Finally... demonstrate sending emails using the replacement patterns.
    -- 

    -- Set our mail server settings..
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.mail.us-west-2.awsapps.com'
    EXEC sp_OASetProperty @mailman, 'SmtpSsl', 1
    EXEC sp_OASetProperty @mailman, 'SmtpPort', 465

    EXEC sp_OASetProperty @mailman, 'SmtpUsername', 'john@example.com'
    EXEC sp_OASetProperty @mailman, 'SmtpPassword', 'the_password'

    -- Imagine we have data in JSON format, and we wish to send the templated email to each recipient...
    -- 

    -- {
    -- 	"mail_merge" : [
    -- 		{
    -- 			"to": "mary@example.com",
    -- 			"name": "Mary",
    -- 			"product": "Widget 1" 
    -- 		},
    -- 		{
    -- 			"to": "robert@example.com",
    -- 			"name": "Robert",
    -- 			"product": "Widget 2"
    -- 		}	
    -- 		...
    -- 	]
    -- }

    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.JsonObject', @json OUT

    EXEC sp_OAMethod @json, 'LoadFile', @success OUT, 'qa_data/json/mail_merge.json'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @json, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @emailTemplate
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    DECLARE @emailAddr nvarchar(4000)

    DECLARE @firstName nvarchar(4000)

    DECLARE @product nvarchar(4000)

    SELECT @i = 0
    EXEC sp_OAMethod @json, 'SizeOfArray', @count OUT, 'mail_merge'
    WHILE @i < @count
      BEGIN
        EXEC sp_OASetProperty @json, 'I', @i
        EXEC sp_OAMethod @json, 'StringOf', @emailAddr OUT, 'mail_merge[i].to'
        EXEC sp_OAMethod @json, 'StringOf', @firstName OUT, 'mail_merge[i].name'
        EXEC sp_OAMethod @json, 'StringOf', @product OUT, 'mail_merge[i].product'

        EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'FIRST_NAME', @firstName
        EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'RECIPIENT_EMAIL', @emailAddr
        EXEC sp_OAMethod @emailTemplate, 'SetReplacePattern', @success OUT, 'PRODUCT_NAME', @product

        EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @emailTemplate
        IF @success = 0
          BEGIN
            EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @emailTemplate
            EXEC @hr = sp_OADestroy @mailman
            EXEC @hr = sp_OADestroy @json
            RETURN
          END


        PRINT 'Send email to ' + @emailAddr

        SELECT @i = @i + 1
      END


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @emailTemplate
    EXEC @hr = sp_OADestroy @mailman
    EXEC @hr = sp_OADestroy @json


END
GO

 

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