[Tex/LaTex] Tikz right-angle edges between nodes

nodestikz-pgf

In the example below I'd like to have angled edges which just go vertically and horizontally.
My aim is to get the edges like in this image (the rounded edges are not a must) BPMN image:

Here is my minimal working example:

\documentclass{article}

\usepackage{tikz}

\usetikzlibrary{arrows,positioning, shapes.symbols,shapes.callouts,patterns}


\begin{document}
\begin{tikzpicture}[
    pre/.style={<-,shorten <=1pt,>=stealth',semithick},
    post/.style={->,shorten >=1pt,>=stealth',semithick}
    ]

\node[draw](start){start};

\node[draw, right=of start] (split) {+}
            edge[pre](start);

\node[draw, right=of split](pricedb){PriceDB}
    edge[pre](split);

\node[draw, below=of pricedb](stockdb){StockDB}
    edge[pre](split);

\node[draw, above=of pricedb](orderpage){OrderPage}
    edge[pre](split);   

\node[draw,right=of pricedb](join){+}
    edge[pre](pricedb)
    edge[pre](stockdb)
    edge[pre](orderpage);

\node[draw, right=of join](invoice){invoiceservice}
    edge[pre](join);

\node(silent)[right=of invoice]{}
    edge[<-,shorten <=1pt,>=stealth',semithick, dashed](invoice);
\end{tikzpicture}
\end{document}

Best Answer

with draw it's simple

\documentclass{article}

\usepackage{tikz}

\usetikzlibrary{arrows,positioning, shapes.symbols,shapes.callouts,patterns}


\begin{document}
\begin{tikzpicture}[
    pre/.style={=stealth',semithick},
    post/.style={->,shorten >=1pt,>=stealth',semithick}
    ]

\node[draw](start){start};

\node[draw, right=of start] (split) {+}
            edge[pre](start);

\node[draw, right=of split](pricedb){PriceDB}
    edge[pre](split);

\node[draw, below=of pricedb](stockdb){StockDB};
\node[draw, above=of pricedb](orderpage){OrderPage};   
\node[draw,right=of pricedb](join){+}
    edge[pre](pricedb);
\node[draw, right=of join](invoice){invoiceservice}
    edge[pre](join);

 \draw[post,rounded corners=5pt] (orderpage)-|(join)  ;   
 \draw[post,rounded corners=5pt] (stockdb)-|(join)  ;   
 \draw[post,rounded corners=5pt] (split) |- (orderpage);
  \draw[post,rounded corners=5pt] (split) |- (stockdb);

\node(silent)[right=of invoice]{}
    edge[=stealth',semithick, dashed](invoice);
\end{tikzpicture}
\end{document}

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