Mail-merging documents from a database

You can build your TeX database, based on your needs simply by creating a list to hold the list of persons you sending your mailing. We will create a list with fields as shown in the table below, will also keep it sorted to make life easier.

This is done by creating first an empty list \let\alist\@empty

The format of the input file, is best to be in TeX format, to make the programming easier and to enable the use of a comma in the addresses. I have used the following format for capturing the fields, but please feel free to use your own:

\RB Nisbet|John|Mr.| 235, Highlands, Scotland | United Kingdom;
\RB Guevara|Che|Dr.| 527 Main Street, Havana | Cuba;
\RB Zapata|Emiliano|Mr.| 5237, Mexico City | Mexico;
\RB von Kleist-Schmenzin|Herr| Ewald| Greens, Dubberow| Germany;

Names are delimited by "|" and an ending semicolon. The standard part of the letter is on a separate file called stdletter.dat. I have generated it on the fly using the filecontents package. The MWE example is shown below.

\documentclass{article}
\usepackage{lstdoc,booktabs,filecontents}
\begin{filecontents}{stdletter.dat}
We are happy to enclose our new catalogue.
\vspace{20pt}

Regards,
\vspace{20pt}

Some CEO
\end{filecontents}
\begin{document}
\pagestyle{plain}
\makeatletter
\let\alist\@empty
\let\blist\@empty

\def\addtolist#1#2{%
  \lst@lAddTo#1{#2}
}

\def\addtolist#1#2{%
  \lst@lAddTo#1{#2}
}


\def\RB#1|#2|#3|#4|#5;{%
   \addtolist{\alist}{#1#2,}% 
   % macro for table
   \expandafter\gdef\csname#1#2@table\endcsname{\textit{#1}&#2&#3&#4\cr\relax}
   % macro for salutation
   \expandafter\gdef\csname#1#2@salut\endcsname{Dear #3 #2\relax}
   \lst@BubbleSort{\alist}
}

%% adding the data now
\RB Nisbet|John|Mr.| 235, Highlands, Scotland | United Kingdom;
\RB Guevara|Che|Dr.| 527 Main Street, Havana | Cuba;
\RB Zapata|Emiliano|Mr.| 5237, Mexico City | Mexico;
\RB von Kleist-Schmenzin|Herr| Ewald| Greens, Dubberow| Germany;

%% typesetting the table
\def\addresslist{%
\newsavebox{\tempbox}
\savebox{\tempbox}{
\centering
\begin{tabular}{llll}
  \toprule[1pt]
  First Name & Second Name & Salutation & Address\\
  \midrule
  \@for\i:=\alist \do{\csname\i @table\endcsname}
  \vspace{-14pt}\\\bottomrule
\end{tabular}}

\begin{table}
\usebox{\tempbox}
\caption{Client List}
\end{table}
}


\addresslist

\mbox{}\newpage

\@for\i:=\alist \do{\csname\i\endcsname
\csname\i \endcsname
\expandafter\csname \i @salut\endcsname
\par\medskip
\input{stdletter.dat}

\pagebreak
}

\makeatletter

\end{document}

The "article" part can be created the same way or preferably printed separately and resetting page numbering (much easier).

A simple solution is the textmerg package to obtain a single pdf, but that you can split with some external tool as pdfsam or pdftk. A MWE:

\documentclass{article}
\usepackage[utf8]{inputenc} 
\usepackage{eurosym}
\usepackage{textmerg} 
\begin{document}

\Fields{\Mr\Name\SurName\Address\Donation} 


\Merge{data.dat}{
\hspace{.25\textwidth}
\begin{tabular}{rl}
Address & {\bf \Mr\ \Name\  \SurName }\\
        & {\bf \Address }\\
        & \\
Subject & \Donation{} donation \\
\end{tabular}
\vspace{2 cm} 
Dear \Mr \Name,  bla bla bla .... 

\newpage    
}
\end{document}

Where the merged file data.dat is a plain text where the field separators are the carriage returns as in this example:

Mr.
Peter
Smith
Newtown Road, Los Angeles, USA
209 \$


Ms. 
Maria 
Rossi
Regina Elena, 113, Milano, Italy
145 \euro