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Commitb62f246

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Support SQL/PSM-compatible CASE statement in plpgsql.
Pavel Stehule
1 parent0fdb350 commitb62f246

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11 files changed

+704
-65
lines changed

11 files changed

+704
-65
lines changed

‎doc/src/sgml/errcodes.sgml‎

Lines changed: 15 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.23 2008/01/1501:36:53 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.24 2008/05/1522:39:48 tgl Exp $ -->
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33
<appendix id="errcodes-appendix">
44
<title><productname>PostgreSQL</productname> Error Codes</title>
@@ -62,14 +62,14 @@
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6363
<tgroup cols="3">
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<colspec colnum="1" colname="errorcode">
65-
<colspec colnum="3" colname="constant">
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<spanspec namest="errorcode" nameend="constant" spanname="span13">
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<colspec colnum="3" colname="condname">
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<spanspec namest="errorcode" nameend="condname" spanname="span13">
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<thead>
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<row>
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<entry>Error Code</entry>
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<entry>Meaning</entry>
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<entry>Constant</entry>
72+
<entry>Condition Name</entry>
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</row>
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</thead>
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@@ -292,6 +292,17 @@
292292
</row>
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<row>
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<entry spanname="span13"><emphasis role="bold">Class 20 &mdash; Case Not Found</></entry>
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</row>
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<row>
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<entry><literal>20000</literal></entry>
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<entry>CASE NOT FOUND</entry>
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<entry>case_not_found</entry>
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</row>
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<row>
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<entry spanname="span13"><emphasis role="bold">Class 21 &mdash; Cardinality Violation</></entry>
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</row>

‎doc/src/sgml/plpgsql.sgml‎

Lines changed: 107 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.129 2008/05/13 22:10:29 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.130 2008/05/15 22:39:49 tgl Exp $ -->
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33
<chapter id="plpgsql">
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<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@@ -1581,9 +1581,9 @@ SELECT * FROM getallfoo();
15811581
<title>Conditionals</title>
15821582

15831583
<para>
1584-
<literal>IF</> statements let you execute commands based on
1585-
certain conditions. <application>PL/pgSQL</> has five forms of
1586-
<literal>IF</>:
1584+
<command>IF</>and <command>CASE</>statements let you execute
1585+
alternative commands based on certain conditions.
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<application>PL/pgSQL</> has five forms of <command>IF</>:
15871587
<itemizedlist>
15881588
<listitem>
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<para><literal>IF ... THEN</></>
@@ -1601,6 +1601,22 @@ SELECT * FROM getallfoo();
16011601
<para><literal>IF ... THEN ... ELSEIF ... THEN ... ELSE</></>
16021602
</listitem>
16031603
</itemizedlist>
1604+
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and four forms of <command>CASE</>:
1606+
<itemizedlist>
1607+
<listitem>
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<para><literal>CASE ... WHEN ... THEN ... END CASE</></>
1609+
</listitem>
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<listitem>
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<para><literal>CASE ... WHEN ... THEN ... ELSE ... END CASE</></>
1612+
</listitem>
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<listitem>
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<para><literal>CASE WHEN ... THEN ... END CASE</></>
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</listitem>
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<listitem>
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<para><literal>CASE WHEN ... THEN ... ELSE ... END CASE</></>
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</listitem>
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</itemizedlist>
16041620
</para>
16051621

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<sect3>
@@ -1751,6 +1767,93 @@ END IF;
17511767
<literal>ELSEIF</> is an alias for <literal>ELSIF</>.
17521768
</para>
17531769
</sect3>
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<sect3>
1772+
<title>Simple <literal>CASE</></title>
1773+
1774+
<synopsis>
1775+
CASE <replaceable>search-expression</replaceable>
1776+
WHEN <replaceable>expression</replaceable> <optional>, <replaceable>expression</replaceable> <optional> ... </optional></optional> THEN
1777+
<replaceable>statements</replaceable>
1778+
<optional> WHEN <replaceable>expression</replaceable> <optional>, <replaceable>expression</replaceable> <optional> ... </optional></optional> THEN
1779+
<replaceable>statements</replaceable>
1780+
... </optional>
1781+
<optional> ELSE
1782+
<replaceable>statements</replaceable> </optional>
1783+
END CASE;
1784+
</synopsis>
1785+
1786+
<para>
1787+
The simple form of <command>CASE</> provides conditional execution
1788+
based on equality of operands. The <replaceable>search-expression</>
1789+
is evaluated (once) and successively compared to each
1790+
<replaceable>expression</> in the <literal>WHEN</> clauses.
1791+
If a match is found, then the corresponding
1792+
<replaceable>statements</replaceable> are executed, and then control
1793+
passes to the next statement after <literal>END CASE</>. (Subsequent
1794+
<literal>WHEN</> expressions are not evaluated.) If no match is
1795+
found, the <literal>ELSE</> <replaceable>statements</replaceable> are
1796+
executed; but if <literal>ELSE</> is not present, then a
1797+
<literal>CASE_NOT_FOUND</literal> exception is raised.
1798+
</para>
1799+
1800+
<para>
1801+
Here is a simple example:
1802+
1803+
<programlisting>
1804+
CASE x
1805+
WHEN 1, 2 THEN
1806+
msg := 'one or two';
1807+
ELSE
1808+
msg := 'other value than one or two';
1809+
END CASE;
1810+
</programlisting>
1811+
</para>
1812+
</sect3>
1813+
1814+
<sect3>
1815+
<title>Searched <literal>CASE</></title>
1816+
1817+
<synopsis>
1818+
CASE
1819+
WHEN <replaceable>boolean-expression</replaceable> THEN
1820+
<replaceable>statements</replaceable>
1821+
<optional> WHEN <replaceable>boolean-expression</replaceable> THEN
1822+
<replaceable>statements</replaceable>
1823+
... </optional>
1824+
<optional> ELSE
1825+
<replaceable>statements</replaceable> </optional>
1826+
END CASE;
1827+
</synopsis>
1828+
1829+
<para>
1830+
The searched form of <command>CASE</> provides conditional execution
1831+
based on truth of boolean expressions. Each <literal>WHEN</> clause's
1832+
<replaceable>boolean-expression</replaceable> is evaluated in turn,
1833+
until one is found that yields <literal>true</>. Then the
1834+
corresponding <replaceable>statements</replaceable> are executed, and
1835+
then control passes to the next statement after <literal>END CASE</>.
1836+
(Subsequent <literal>WHEN</> expressions are not evaluated.)
1837+
If no true result is found, the <literal>ELSE</>
1838+
<replaceable>statements</replaceable> are executed;
1839+
but if <literal>ELSE</> is not present, then a
1840+
<literal>CASE_NOT_FOUND</literal> exception is raised.
1841+
</para>
1842+
1843+
<para>
1844+
Here is an example:
1845+
1846+
<programlisting>
1847+
CASE
1848+
WHEN x BETWEEN 0 AND 10 THEN
1849+
msg := 'value is between zero and ten';
1850+
WHEN x BETWEEN 11 AND 20 THEN
1851+
msg := 'value is between eleven and twenty';
1852+
END CASE;
1853+
</programlisting>
1854+
</para>
1855+
1856+
</sect3>
17541857
</sect2>
17551858

17561859
<sect2 id="plpgsql-control-structures-loops">

‎src/include/utils/errcodes.h‎

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
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*
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* Copyright (c) 2003-2008, PostgreSQL Global Development Group
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*
14-
* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.24 2008/01/01 19:45:59 momjian Exp $
14+
* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.25 2008/05/15 22:39:49 tgl Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -101,6 +101,9 @@
101101
/* Class 0P - Invalid Role Specification */
102102
#defineERRCODE_INVALID_ROLE_SPECIFICATIONMAKE_SQLSTATE('0','P', '0','0','0')
103103

104+
/* Class 20 - Case Not Found */
105+
#defineERRCODE_CASE_NOT_FOUNDMAKE_SQLSTATE('2','0', '0','0','0')
106+
104107
/* Class 21 - Cardinality Violation */
105108
/* (this means something returned the wrong number of rows) */
106109
#defineERRCODE_CARDINALITY_VIOLATIONMAKE_SQLSTATE('2','1', '0','0','0')

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