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authorGravatar Adam Chlipala <adamc@hcoop.net>2008-12-07 10:25:55 -0500
committerGravatar Adam Chlipala <adamc@hcoop.net>2008-12-07 10:25:55 -0500
commit41c63800f3c6f330002b29b133836f6e4f7a81d3 (patch)
tree4dc16d450814d8fa679c0997eeb014104f26be1f /doc/manual.tex
parentd86935ec25586bbba5b6aaf60fb93d20e99de964 (diff)
Sequences
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@@ -1187,4 +1187,14 @@ $$\begin{array}{l}
\mt{val} \; \mt{delete} : \mt{fields} ::: \{\mt{Type}\} \to \mt{sql\_table} \; \mt{fields} \to \mt{sql\_exp} \; [\mt{T} = \mt{fields}] \; [] \; [] \; \mt{bool} \to \mt{dml}
\end{array}$$
+\subsubsection{Sequences}
+
+SQL sequences are counters with concurrency control, often used to assign unique IDs. Ur/Web supports them via a simple interface. The only way to create a sequence is with the $\mt{sequence}$ declaration form.
+
+$$\begin{array}{l}
+ \mt{type} \; \mt{sql\_sequence} \\
+ \mt{val} \; \mt{nextval} : \mt{sql\_sequence} \to \mt{transaction} \; \mt{int}
+\end{array}$$
+
+
\end{document} \ No newline at end of file