sp_send_dbmail :如果选择了特定变量，则发送电子邮件

sp_send_dbmail
    [ [ @profile_name = ] 'profile_name' ]
    [ , [ @recipients = ] 'recipients [ ; ...n ]' ]
    [ , [ @copy_recipients = ] 'copy_recipients [ ; ...n ]' ]
    [ , [ @blind_copy_recipients = ] 'blind_copy_recipients [ ; ...n ]' ]
    [ , [ @subject = ] 'subject' ]
    [ , [ @body = ] 'body' ]
    [ , [ @body_format = ] 'body_format' ]
    [ , [ @importance = ] 'importance' ]
    [ , [ @sensitivity = ] 'sensitivity' ]
    [ , [ @file_attachments = ] 'attachment [ ; ...n ]' ]
    [ , [ @query = ] 'query' ]
    [ , [ @execute_query_database = ] 'execute_query_database' ]
    [ , [ @attach_query_result_as_file = ] attach_query_result_as_file ]
    [ , [ @query_attachment_filename = ] query_attachment_filename ]
    [ , [ @query_result_header = ] query_result_header ]
    [ , [ @query_result_width = ] query_result_width ]
    [ , [ @query_result_separator = ] 'query_result_separator' ]
    [ , [ @exclude_query_output = ] exclude_query_output ]
    [ , [ @append_query_error = ] append_query_error ]
    [ , [ @query_no_truncate = ] query_no_truncate ]
    [ , [ @mailitem_id = ] mailitem_id ]
    [ , [ @from_address = ] 'from_address' ]
    [ , [ @reply_to = ] 'reply_to' ]
    [ , [ @importance = ] 'importance' ]
    [ , [ @sensitivity = ] 'sensitivity' ]
    [ , [ @body_format = ] 'body_format' ]
    [ , [ @body = ] 'body' ]
    [ , [ @file_attachments = ] 'attachment [ ; ...n ]' ]
    [ , [ @query = ] 'query' ]
    [ , [ @execute_query_database = ] 'execute_query_database' ]
    [ , [ @attach_query_result_as_file = ] attach_query_result_as_file ]
    [ , [ @query_attachment_filename = ] query_attachment_filename ]
    [ , [ @query_result_header = ] query_result_header ]
    [ , [ @query_result_width = ] query_result_width ]
    [ , [ @query_result_separator = ] 'query_result_separator' ]
    [ , [ @exclude_query_output = ] exclude_query_output ]
    [ , [ @append_query_error = ] append_query_error ]
    [ , [ @query_no_truncate = ] query_no_truncate ]
    [ , [ @mailitem_id = ] mailitem_id ]