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Code review for SELECT INTO STRICT patch: use saner choices of error
SQLSTATEs, fix some documentation problems.
This commit is contained in:
Tom Lane
parent
3ba3e6c8ce
commit
c892643a3c
@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.19 2006/06/16 22:41:45 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/errcodes.sgml,v 1.20 2006/06/16 23:29:26 tgl Exp $ -->
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<appendix id="errcodes-appendix">
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<title><productname>PostgreSQL</productname> Error Codes</title>
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@ -1344,6 +1344,18 @@
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<entry>raise_exception</entry>
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</row>
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<row>
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<entry><literal>P0002</literal></entry>
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<entry>NO DATA FOUND</entry>
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<entry>no_data_found</entry>
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</row>
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<row>
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<entry><literal>P0003</literal></entry>
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<entry>TOO MANY ROWS</entry>
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<entry>too_many_rows</entry>
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</row>
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<row>
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<entry spanname="span13"><emphasis role="bold">Class XX — Internal Error</></entry>
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.96 2006/06/15 18:02:22 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.97 2006/06/16 23:29:26 tgl Exp $ -->
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<chapter id="plpgsql">
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<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
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@ -1076,8 +1076,8 @@ tax := subtotal * 0.06;
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</indexterm>
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<para>
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The result of a <command>SELECT</command> command yielding multiple columns (but
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only one row) can be assigned to a record variable, row-type
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The result of a <command>SELECT</command> command yielding multiple
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columns (but only one row) can be assigned to a record variable, row-type
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variable, or list of scalar variables. This is done by:
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<synopsis>
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@ -1126,23 +1126,24 @@ SELECT INTO <optional>STRICT</optional> <replaceable>target</replaceable> <repla
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<replaceable>target</replaceable> will be set to the first row
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returned by the query, or if the query returned no rows,
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null values are assigned. (Note that <quote>the first row</> is not
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well-defined unless you've used <literal>ORDER BY</>.)
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You can check the special <literal>FOUND</literal> variable to
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determine if any rows were found:
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well-defined unless you've used <literal>ORDER BY</>.) Any result rows
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after the first row are discarded.
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You can check the special <literal>FOUND</literal> variable (see
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<xref linkend="plpgsql-statements-diagnostics">) to
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determine whether a row was returned:
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<programlisting>
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SELECT INTO STRICT myrec * FROM emp WHERE empname = myname;
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SELECT INTO myrec * FROM emp WHERE empname = myname;
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IF NOT FOUND THEN
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RAISE EXCEPTION 'employee % not found', myname;
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END IF;
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</programlisting>
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<para>
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If the <literal>STRICT</literal> option is specified, a query must
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If the <literal>STRICT</literal> option is specified, the query must
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return exactly one row or a run-time error will be thrown, either
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<literal>NO_DATA_FOUND</> (no rows) or <literal>TOO_MANY_ROWS</>
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(more than one row). You can must use exception blocks to determine
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the number of rows generated by the query:
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(more than one row). You can use an exception block if you wish
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to catch the error, for example:
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<programlisting>
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BEGIN;
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@ -1154,11 +1155,17 @@ BEGIN;
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RAISE EXCEPTION 'employee % not unique', myname;
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END;
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</programlisting>
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Only <command>SELECT INTO STRICT</command> allows you to check if more
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than one row was retrieved. <command>SELECT INTO STRICT</command>
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matches Oracle's PL/SQL <command>SELECT INTO</command> behavior.
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Successful execution of <command>SELECT INTO STRICT</command>
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always sets <literal>FOUND</literal> to true.
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</para>
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<note>
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<para>
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<command>SELECT INTO STRICT</command> matches the behavior of
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Oracle PL/SQL's <command>SELECT INTO</command> statement.
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</para>
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</note>
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</sect2>
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<sect2 id="plpgsql-statements-perform">
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@ -1987,7 +1994,7 @@ END LOOP <optional> <replaceable>label</replaceable> </optional>;
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the loop. If the <literal>BY</> clause isn't specified the iteration
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step is 1 otherwise it's the value specified in the <literal>BY</>
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clause. If <literal>REVERSE</> is specified then the step value is
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considered negative.
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considered negative.
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</para>
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<para>
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@ -2764,7 +2771,7 @@ RAISE EXCEPTION 'Nonexistent ID --> %', user_id;
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<para>
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Data type <type>name</type>; the name of the table that caused the trigger
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invocation. This is now deprecated, and could disappear in a future
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release. Use <literal>TG_TABLE_NAME</> instead.
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release. Use <literal>TG_TABLE_NAME</> instead.
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</para>
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</listitem>
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</varlistentry>
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@ -2774,7 +2781,7 @@ RAISE EXCEPTION 'Nonexistent ID --> %', user_id;
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<listitem>
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<para>
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Data type <type>name</type>; the name of the table that
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caused the trigger invocation.
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caused the trigger invocation.
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</para>
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</listitem>
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</varlistentry>
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@ -2784,7 +2791,7 @@ RAISE EXCEPTION 'Nonexistent ID --> %', user_id;
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<listitem>
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<para>
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Data type <type>name</type>; the name of the schema of the
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table that caused the trigger invocation.
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table that caused the trigger invocation.
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</para>
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</listitem>
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</varlistentry>
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@ -11,7 +11,7 @@
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*
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* Copyright (c) 2003-2006, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.19 2006/03/05 15:59:07 momjian Exp $
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* $PostgreSQL: pgsql/src/include/utils/errcodes.h,v 1.20 2006/06/16 23:29:26 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -331,6 +331,8 @@
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/* Class P0 - PL/pgSQL Error (PostgreSQL-specific error class) */
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#define ERRCODE_PLPGSQL_ERROR MAKE_SQLSTATE('P','0', '0','0','0')
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#define ERRCODE_RAISE_EXCEPTION MAKE_SQLSTATE('P','0', '0','0','1')
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#define ERRCODE_NO_DATA_FOUND MAKE_SQLSTATE('P','0', '0','0','2')
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#define ERRCODE_TOO_MANY_ROWS MAKE_SQLSTATE('P','0', '0','0','3')
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/* Class XX - Internal Error (PostgreSQL-specific error class) */
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/* (this is for "can't-happen" conditions and software bugs) */
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@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.92 2006/06/15 18:02:22 momjian Exp $
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.93 2006/06/16 23:29:26 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -157,7 +157,6 @@ static void check_labels(const char *start_label,
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%token K_ELSE
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%token K_ELSIF
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%token K_END
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%token K_STRICT
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%token K_EXCEPTION
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%token K_EXECUTE
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%token K_EXIT
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@ -187,6 +186,7 @@ static void check_labels(const char *start_label,
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%token K_RETURN_NEXT
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%token K_REVERSE
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%token K_SELECT
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%token K_STRICT
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%token K_THEN
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%token K_TO
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%token K_TYPE
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.172 2006/06/16 18:42:23 tgl Exp $
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.173 2006/06/16 23:29:27 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -1721,7 +1721,7 @@ exec_stmt_select(PLpgSQL_execstate *estate, PLpgSQL_stmt_select *stmt)
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{
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if (stmt->strict)
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ereport(ERROR,
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(errcode(ERRCODE_NO_DATA),
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(errcode(ERRCODE_NO_DATA_FOUND),
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errmsg("query returned no rows")));
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/* set the target to NULL(s) */
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@ -1732,7 +1732,7 @@ exec_stmt_select(PLpgSQL_execstate *estate, PLpgSQL_stmt_select *stmt)
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if (n > 1 && stmt->strict)
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ereport(ERROR,
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(errcode(ERRCODE_CARDINALITY_VIOLATION),
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(errcode(ERRCODE_TOO_MANY_ROWS),
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errmsg("query returned more than one row")));
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/*
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@ -9,7 +9,7 @@
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*
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* Copyright (c) 2003-2006, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/plerrcodes.h,v 1.8 2006/06/15 18:02:22 momjian Exp $
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/plerrcodes.h,v 1.9 2006/06/16 23:29:27 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -711,6 +711,14 @@
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"raise_exception", ERRCODE_RAISE_EXCEPTION
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},
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{
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"no_data_found", ERRCODE_NO_DATA_FOUND
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},
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{
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"too_many_rows", ERRCODE_TOO_MANY_ROWS
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},
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{
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"internal_error", ERRCODE_INTERNAL_ERROR
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},
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@ -722,13 +730,3 @@
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{
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"index_corrupted", ERRCODE_INDEX_CORRUPTED
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},
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{
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"no_data_found", ERRCODE_NO_DATA
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},
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{
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"too_many_rows", ERRCODE_CARDINALITY_VIOLATION
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},
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@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/scan.l,v 1.51 2006/06/15 18:02:22 momjian Exp $
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* $PostgreSQL: pgsql/src/pl/plpgsql/src/scan.l,v 1.52 2006/06/16 23:29:27 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -129,7 +129,6 @@ else { return K_ELSE; }
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elseif { return K_ELSIF; }
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elsif { return K_ELSIF; }
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end { return K_END; }
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strict { return K_STRICT; }
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exception { return K_EXCEPTION; }
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execute { return K_EXECUTE; }
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exit { return K_EXIT; }
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@ -158,6 +157,7 @@ return { return K_RETURN; }
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reverse { return K_REVERSE; }
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row_count { return K_ROW_COUNT; }
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select { return K_SELECT; }
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strict { return K_STRICT; }
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then { return K_THEN; }
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to { return K_TO; }
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type { return K_TYPE; }
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