On Thu, Sep 29, 2016 at 11:12:11AM +1300, Thomas Munro wrote:
> On Mon, Sep 26, 2016 at 5:11 PM, Thomas Munro
> <thomas.mu...@enterprisedb.com> wrote:
> > On Mon, Sep 26, 2016 at 1:18 PM, Thomas Munro
> > <thomas.mu...@enterprisedb.com> wrote:
> >>
> >> On Mon, Sep 19, 2016 at 4:02 PM, David Fetter <da...@fetter.org> wrote:
> >> >
> >> > [training_wheels_004.patch]
> >>
> >> [review]
>
> Ping.
Please find attached the next revision.
Best,
David.
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Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
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diff --git a/contrib/Makefile b/contrib/Makefile
index 25263c0..4bd456f 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -40,6 +40,7 @@ SUBDIRS = \
pgstattuple \
pg_visibility \
postgres_fdw \
+ require_where \
seg \
spi \
tablefunc \
diff --git a/contrib/require_where/Makefile b/contrib/require_where/Makefile
new file mode 100644
index 0000000..0cf3663
--- /dev/null
+++ b/contrib/require_where/Makefile
@@ -0,0 +1,17 @@
+# contrib/require_where/Makefile
+
+MODULE_big = require_where
+OBJS = require_where.o
+
+PGFILEDESC = 'require_where - require DELETE and/or UPDATE to have a WHERE
clause'
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS = $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/require_where
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_builddir)/contrib/contrib-global.mk
+endif
diff --git a/contrib/require_where/data/test_require_where.data
b/contrib/require_where/data/test_require_where.data
new file mode 100644
index 0000000..d4a29d8
--- /dev/null
+++ b/contrib/require_where/data/test_require_where.data
@@ -0,0 +1,16 @@
+Four
+score
+and
+seven
+years
+ago
+our
+fathers
+brought
+forth
+on
+this
+continent
+a
+new
+nation
diff --git a/contrib/require_where/expected/require_where.out
b/contrib/require_where/expected/require_where.out
new file mode 100644
index 0000000..0876e13
--- /dev/null
+++ b/contrib/require_where/expected/require_where.out
@@ -0,0 +1,12 @@
+LOAD
+CREATE TABLE
+COPY 16
+UPDATE 16
+SET
+psql:sql/require_where.sql:17: ERROR: UPDATE requires a WHERE clause
+HINT: To update all rows, use "WHERE true" or similar.
+SET
+psql:sql/require_where.sql:21: ERROR: DELETE requires a WHERE clause
+HINT: To delete all rows, use "WHERE true" or similar.
+SET
+DELETE 16
diff --git a/contrib/require_where/require_where.c
b/contrib/require_where/require_where.c
new file mode 100644
index 0000000..27cbc25
--- /dev/null
+++ b/contrib/require_where/require_where.c
@@ -0,0 +1,92 @@
+/*
+ * --------------------------------------------------------------------------
+ *
+ * require_where.c
+ *
+ * Copyright (C) 2016, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * contrib/require_where/require_where.c
+ *
+ * --------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "fmgr.h"
+
+#include "parser/analyze.h"
+
+#include "utils/elog.h"
+#include "utils/guc.h"
+
+PG_MODULE_MAGIC;
+
+void _PG_init(void);
+void _PG_fini(void);
+
+static post_parse_analyze_hook_type original_post_parse_analyze_hook =
NULL;
+static bool require_where_delete = false;
+static bool require_where_update = false;
+
+static void
+require_where_check(ParseState *pstate, Query *query)
+{
+
+ if (require_where_delete && query->commandType == CMD_DELETE)
+ {
+ Assert(query->jointree != NULL);
+ if (query->jointree->quals == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("DELETE requires a WHERE clause
when require_where.delete is set to on"),
+ errhint("To delete all rows, use
\"WHERE true\" or similar.")));
+ }
+
+ if (require_where_update && query->commandType == CMD_UPDATE)
+ {
+ Assert(query->jointree != NULL);
+ if (query->jointree->quals == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("UPDATE requires a WHERE clause
when require_where.delete is set to on"),
+ errhint("To update all rows, use
\"WHERE true\" or similar.")));
+ }
+
+ if (original_post_parse_analyze_hook != NULL)
+ (*original_post_parse_analyze_hook) (pstate, query);
+}
+
+void
+_PG_init(void)
+{
+ DefineCustomBoolVariable("require_where.delete",
+ "Require every DELETE
statement to have a WHERE clause.",
+ NULL,
+ &require_where_delete,
+ false,
+ PGC_USERSET,
+ 0,
+ NULL,
+ NULL,
+ NULL);
+
+ DefineCustomBoolVariable("require_where.update",
+ "Require every UPDATE
statement to have a WHERE clause.",
+ NULL,
+ &require_where_update,
+ false,
+ PGC_USERSET,
+ 0,
+ NULL,
+ NULL,
+ NULL);
+
+ original_post_parse_analyze_hook = post_parse_analyze_hook;
+ post_parse_analyze_hook = require_where_check;
+}
+
+void
+_PG_fini(void)
+{
+ post_parse_analyze_hook = original_post_parse_analyze_hook;
+}
diff --git a/contrib/require_where/sql/require_where.sql
b/contrib/require_where/sql/require_where.sql
new file mode 100644
index 0000000..a1cd90d
--- /dev/null
+++ b/contrib/require_where/sql/require_where.sql
@@ -0,0 +1,25 @@
+--
+-- Test require_where
+--
+
+\set echo all
+
+LOAD 'require_where';
+
+CREATE TABLE test_require_where(t TEXT);
+
+\copy test_require_where from 'data/test_require_where.data'
+
+UPDATE test_require_where SET t=t; -- succeeds
+
+SET require_where.update TO ON;
+
+UPDATE test_require_where SET t=t; -- fails
+
+SET require_where.delete TO ON;
+
+DELETE FROM test_require_where; -- fails
+
+SET require_where.delete TO OFF; -- succeeds
+
+DELETE FROM test_require_where; -- fails
diff --git a/doc/src/sgml/contrib.sgml b/doc/src/sgml/contrib.sgml
index c8708ec..7ca62a4 100644
--- a/doc/src/sgml/contrib.sgml
+++ b/doc/src/sgml/contrib.sgml
@@ -135,6 +135,7 @@ CREATE EXTENSION <replaceable>module_name</> FROM
unpackaged;
&pgtrgm;
&pgvisibility;
&postgres-fdw;
+ &require_where;
&seg;
&sepgsql;
&contrib-spi;
diff --git a/doc/src/sgml/filelist.sgml b/doc/src/sgml/filelist.sgml
index 69649a7..8079cbd 100644
--- a/doc/src/sgml/filelist.sgml
+++ b/doc/src/sgml/filelist.sgml
@@ -141,6 +141,7 @@
<!ENTITY pgtrgm SYSTEM "pgtrgm.sgml">
<!ENTITY pgvisibility SYSTEM "pgvisibility.sgml">
<!ENTITY postgres-fdw SYSTEM "postgres-fdw.sgml">
+<!ENTITY require_where SYSTEM "require_where.sgml">
<!ENTITY seg SYSTEM "seg.sgml">
<!ENTITY contrib-spi SYSTEM "contrib-spi.sgml">
<!ENTITY sepgsql SYSTEM "sepgsql.sgml">
diff --git a/doc/src/sgml/require_where.sgml b/doc/src/sgml/require_where.sgml
new file mode 100644
index 0000000..30bc05a
--- /dev/null
+++ b/doc/src/sgml/require_where.sgml
@@ -0,0 +1,96 @@
+<!-- doc/src/sgml/require_where.sgml -->
+
+<sect1 id="require_where" xreflabel="require_where">
+ <title>require_where</title>
+
+ <indexterm zone="require_where">
+ <primary>require_where</primary>
+ </indexterm>
+
+ <para>
+ This module allows a user to require that WHERE clauses on either DELETE or
+ UPDATE not be empty using a custom GUC to control each.
+ </para>
+
+ <para>
+ To use this module, you need to include <literal>require_where</literal> in
+ the either the <xref linkend="guc-shared-preload-libraries"> parameter, or
+ <command>LOAD</command> the library directly.
+ </para>
+
+ <para>
+ Here is an example showing how to set up a database cluster with
+ <literal>require_where</literal>.
+<screen>
+$ psql -U postgres
+# SHOW shared_preload_libraries; /* Make sure not to clobber something by
accident */
+
+If you found something,
+# ALTER SYSTEM SET
shared_preload_libraries='the,stuff,you,found,require_where';
+
+Otherwise,
+# ALTER SYSTEM SET shared_preload_libraries='require_where';
+
+Then restart <productname>PostgreSQL</productname>
+</screen>
+ </para>
+
+ <para>
+ Here is an example using <command>LOAD</command>:
+<screen>
+$ psql -U postgres
+# LOAD '$libdir/require_where';
+</screen>
+ </para>
+
+ <sect2>
+ <title>GUC Parameters</title>
+
+ <variablelist>
+ <varlistentry id="guc-require_where-delete"
xreflabel="require_where.delete">
+ <term>
+ <varname>require_where.delete</varname> (<type>boolean</type>)
+ <indexterm>
+ <primary><varname>require_where.delete</varname> configuration
parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ This parameter defaults to <literal>false</literal>. When set
+ to <literal>true</literal>, every <literal>DELETE</literal> requires
+ some kind of <literal>WHERE</literal> clause in order to
+ execute. When <literal>DELETE</literal> is meant to span the
+ entire relation, one can issue a <literal>WHERE true</literal>
+ or equivalent.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry id="guc-require_where-update"
xreflabel="require_where.update">
+ <term>
+ <varname>require_where.update</varname> (<type>boolean</type>)
+ <indexterm>
+ <primary><varname>require_where.update</varname> configuration
parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ This parameter defaults to <literal>false</literal>. When set
+ to <literal>true</literal>, every <literal>UPDATE</literal> requires
+ some kind of <literal>WHERE</literal> clause in order to
+ execute. When <literal>UPDATE</literal> is meant to span the
+ entire relation, one can issue a <literal>WHERE true</literal>
+ or equivalent.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </sect2>
+
+ <sect2>
+ <title>Authors</title>
+
+ <para>
+ David Fetter <email>da...@fetter.org</email>, Oakland, California, USA
+ </para>
+ </sect2>
+</sect1>
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