<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/advanced.sgml,v 1.19 2000/12/30 19:11:45 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/advanced.sgml,v 1.20 2001/01/05 06:34:15 tgl Exp $
-->
<chapter id="advanced">
altitude int -- (in ft)
);
-CREATE TABLE capitals UNDER cities (
+CREATE TABLE capitals (
state char(2)
-);
+) INHERITS (cities);
</programlisting>
In this case, an instance of capitals <firstterm>inherits</firstterm> all
<para>
For example, the following query finds the names of all cities,
including state capitals, that are located at an altitude
- over 500ft, the query is:
+ over 500ft:
<programlisting>
-SELECT c.name, c.altitude
- FROM cities c
- WHERE c.altitude > 500;
+SELECT name, altitude
+ FROM cities
+ WHERE altitude > 500;
</programlisting>
which returns:
<para>
On the other hand, the following query finds
- all the cities, but not capital cities
- that are situated at an attitude of 500ft or higher:
+ all the cities that are not state capitals and
+ are situated at an altitude of 500ft or higher:
<programlisting>
SELECT name, altitude
<para>
Here the <quote>ONLY</quote> before cities indicates that the query should
- be run over only cities and not classes below cities in the
+ be run over only the cities table, and not classes below cities in the
inheritance hierarchy. Many of the commands that we
have already discussed -- <command>SELECT</command>,
<command>UPDATE</command> and <command>DELETE</command> --
<para>
In previous versions of <productname>Postgres</productname>, the
default was not to get access to child tables. This was found to
- be error prone and is also in violation of SQL. Under the old
+ be error prone and is also in violation of SQL99. Under the old
syntax, to get the sub-classes you append "*" to the table name.
For example
<programlisting>
SELECT * from cities*;
</programlisting>
- To get the old behavior, the set configuration option
+ You can still explicitly specify scanning child tables by appending
+ "*", as well as explicitly specify not scanning child tables by
+ writing <quote>ONLY</quote>. But beginning in version 7.1, the default
+ behavior for an undecorated table name is to scan its child tables
+ too, whereas before the default was not to do so. To get the old
+ default behavior, set the configuration option
<literal>SQL_Inheritance</literal> to off, e.g.,
<programlisting>
SET SQL_Inheritance TO OFF;
<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/Attic/inherit.sgml,v 1.11 2000/07/02 22:00:23 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/Attic/inherit.sgml,v 1.12 2001/01/05 06:34:15 tgl Exp $
-->
<chapter id="inherit">
altitude int -- (in ft)
);
-CREATE TABLE capitals UNDER cities (
+CREATE TABLE capitals (
state char(2)
-);
+) INHERITS (cities);
</programlisting>
In this case, an instance of capitals <firstterm>inherits</firstterm> all
</para>
<para>
- For example, the following query finds the names of all cities,
- including state capitals, that are located at an altitude
- over 500ft, the query is:
+ For example, the following query finds the names of all cities,
+ including state capitals, that are located at an altitude
+ over 500ft:
- <programlisting>
- SELECT c.name, c.altitude
- FROM cities c
- WHERE c.altitude > 500;
-</programlisting>
+SELECT name, altitude
+ FROM cities
+ WHERE altitude > 500;
+ </programlisting>
which returns:
</para>
<para>
- On the other hand, the following query finds
- all the cities, but not capital cities
- that are situated at an attitude of 500ft or higher:
+ On the other hand, the following query finds
+ all the cities that are not state capitals and
+ are situated at an altitude of 500ft or higher:
<programlisting>
- SELECT name, altitude
+SELECT name, altitude
FROM ONLY cities
WHERE altitude > 500;
<programlisting>
SELECT c.tableoid, c.name, c.altitude
FROM cities c
- WHERE c.altitude > 500;
+ WHERE c.altitude > 500;
</programlisting>
which returns:
<programlisting>
SELECT p.relname, c.name, c.altitude
FROM cities c, pg_class p
- WHERE c.altitude > 500 and c.tableoid = p.oid;
+ WHERE c.altitude > 500 and c.tableoid = p.oid;
</programlisting>
which returns:
<note>
<title>Deprecated</title>
<para>
- In previous versions of <productname>Postgres</productname>, the
- default was not to get access to child tables. This was found to
- be error prone and is also in violation of SQL. Under the old
- syntax, to get the sub-classes you append "*" to the table name.
- For example
+
In previous versions of <productname>Postgres</productname>, the
+ default was not to get access to child tables. This was found to
+ be error prone and is also in violation of SQL99. Under the old
+ syntax, to get the sub-classes you append "*" to the table name.
+ For example
<programlisting>
SELECT * from cities*;
</programlisting>
- To get the old behavior, the set configuration option
- <literal>SQL_Inheritance</literal> to off, e.g.,
+ You can still explicitly specify scanning child tables by appending
+ "*", as well as explicitly specify not scanning child tables by
+ writing <quote>ONLY</quote>. But beginning in version 7.1, the default
+ behavior for an undecorated table name is to scan its child tables
+ too, whereas before the default was not to do so. To get the old
+ default behavior, set the configuration option
+ <literal>SQL_Inheritance</literal> to off, e.g.,
<programlisting>
SET SQL_Inheritance TO OFF;
</programlisting>
- or add a line in your <filename>postgresql.conf</filename> file.
+ or add a line in your <filename>postgresql.conf</filename> file.
</para>
</note>
</chapter>
<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.17 2000/12/25 23:15:26 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.18 2001/01/05 06:34:16 tgl Exp $
Postgres documentation
-->
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
-ALTER TABLE [ ONLY ]<replaceable class="PARAMETER">table</replaceable> [ * ]
+ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ]
ADD [ COLUMN ] <replaceable class="PARAMETER">column</replaceable> <replaceable
class="PARAMETER">type</replaceable>
-ALTER TABLE [ ONLY ]<replaceable class="PARAMETER">table</replaceable> [ * ]
+ALTER TABLE [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ * ]
ALTER [ COLUMN ] <replaceable class="PARAMETER">column</replaceable> { SET DEFAULT <replaceable
class="PARAMETER">value</replaceable> | DROP DEFAULT }
ALTER TABLE <replaceable class="PARAMETER">table</replaceable> [ * ]
<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.38 2000/12/30 19:00:11 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.39 2001/01/05 06:34:16 tgl Exp $
Postgres documentation
-->
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
- <date>2000-03-25</date>
+ <date>2001-01-04</date>
</refsynopsisdivinfo>
<synopsis>
-CREATE [ TEMPORARY | TEMP ] TABLE <replaceable class="PARAMETER">table</replaceable>
- [ UNDER <replaceable>inherited_table</replaceable> [, ...] ]
- (
+CREATE [ TEMPORARY | TEMP ] TABLE <replaceable class="PARAMETER">table</replaceable> (
<replaceable class="PARAMETER">column</replaceable> <replaceable class="PARAMETER">type</replaceable>
[ NULL | NOT NULL ] [ UNIQUE ] [ DEFAULT <replaceable class="PARAMETER">value</replaceable> ]
[<replaceable>column_constraint_clause</replaceable> | PRIMARY KEY } [ ... ] ]
[, PRIMARY KEY ( <replaceable class="PARAMETER">column</replaceable> [, ...] ) ]
[, CHECK ( <replaceable class="PARAMETER">condition</replaceable> ) ]
[, <replaceable>table_constraint_clause</replaceable> ]
- )
+ ) [ INHERITS ( <replaceable>inherited_table</replaceable> [, ...] ) ]
</synopsis>
<refsect2 id="R2-SQL-CREATETABLE-1">
</varlistentry>
<varlistentry>
- <term>UNDER <replaceable class="PARAMETER">inherited_table</replaceable></term>
+ <term>INHERITS <replaceable class="PARAMETER">inherited_table</replaceable></term>
<listitem>
<para>
- The optional UNDER clause specifies a collection of table
+ The optional INHERITS clause specifies a list of table
names from which this table automatically inherits all fields.
If any inherited field name appears more than once,
<productname>Postgres</productname>
</para>
<para>
- The optional UNDER
+ The optional INHERITS
clause specifies a collection of table names from which this table
automatically inherits all fields. If any inherited field name
appears more than once, Postgres reports an error. Postgres automatically
</synopsis>
</para>
</refsect3>
+
+ <refsect3 id="R3-SQL-INHERITANCE-1">
+ <title>
+ Inheritance
+ </title>
+ <para>
+ Multiple inheritance via the INHERITS clause is a
+ <productname>Postgres</productname> language extension.
+ SQL99 (but not SQL92) defines single inheritance using a different
+ syntax and different semantics. SQL99-style inheritance is not yet
+ supported by <productname>Postgres</productname>.
+ </para>
+ </refsect3>
</refsect2>
</refsect1>
</refentry>
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.135 2000/12/14 22:30:42 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.136 2001/01/05 06:34:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
if (from->relname)
newnode->relname = pstrdup(from->relname);
- newnode->inh = from->inh;
+ newnode->inhOpt = from->inhOpt;
Node_Copy(from, newnode, name);
return newnode;
if (from->relname)
newnode->relname = pstrdup(from->relname);
Node_Copy(from, newnode, whereClause);
- newnode->inh = from->inh;
+ newnode->inhOpt = from->inhOpt;
return newnode;
}
Node_Copy(from, newnode, targetList);
Node_Copy(from, newnode, whereClause);
Node_Copy(from, newnode, fromClause);
- newnode->inh = from->inh;
+ newnode->inhOpt = from->inhOpt;
return newnode;
}
newnode->subtype = from->subtype;
if (from->relname)
newnode->relname = pstrdup(from->relname);
- newnode->inh = from->inh;
+ newnode->inhOpt = from->inhOpt;
if (from->name)
newnode->name = pstrdup(from->name);
Node_Copy(from, newnode, def);
RenameStmt *newnode = makeNode(RenameStmt);
newnode->relname = pstrdup(from->relname);
- newnode->inh = from->inh;
+ newnode->inhOpt = from->inhOpt;
if (from->column)
newnode->column = pstrdup(from->column);
if (from->newname)
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.85 2000/12/14 22:30:42 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.86 2001/01/05 06:34:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
return false;
if (!equal(a->whereClause, b->whereClause))
return false;
- if (a->inh != b->inh)
+ if (a->inhOpt != b->inhOpt)
return false;
return true;
return false;
if (!equal(a->fromClause, b->fromClause))
return false;
- if (a->inh != b->inh)
+ if (a->inhOpt != b->inhOpt)
return false;
return true;
return false;
if (!equalstr(a->relname, b->relname))
return false;
- if (a->inh != b->inh)
+ if (a->inhOpt != b->inhOpt)
return false;
if (!equalstr(a->name, b->name))
return false;
{
if (!equalstr(a->relname, b->relname))
return false;
- if (a->inh != b->inh)
+ if (a->inhOpt != b->inhOpt)
return false;
if (!equalstr(a->column, b->column))
return false;
{
if (!equalstr(a->relname, b->relname))
return false;
- if (a->inh != b->inh)
+ if (a->inhOpt != b->inhOpt)
return false;
if (!equal(a->name, b->name))
return false;
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: analyze.c,v 1.173 2000/12/18 01:37:56 tgl Exp $
+ * $Id: analyze.c,v 1.174 2001/01/05 06:34:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/* set up a range table */
lockTargetTable(pstate, stmt->relname);
makeRangeTable(pstate, NIL);
- setTargetTable(pstate, stmt->relname, stmt->inh, true);
+ setTargetTable(pstate, stmt->relname,
+ interpretInhOption(stmt->inhOpt), true);
qry->distinctClause = NIL;
*/
lockTargetTable(pstate, stmt->relname);
makeRangeTable(pstate, stmt->fromClause);
- setTargetTable(pstate, stmt->relname, stmt->inh, true);
+ setTargetTable(pstate, stmt->relname,
+ interpretInhOption(stmt->inhOpt), true);
qry->targetList = transformTargetList(pstate, stmt->targetList);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.212 2000/12/22 07:07:58 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.213 2001/01/05 06:34:18 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
* SQL92-specific syntax is separated from plain SQL/Postgres syntax
* to help isolate the non-extensible portions of the parser.
*
- * if you use list, make sure the datum is a node so that the printing
- * routines work
- *
- * WARNING
- * sometimes we assign constants to makeStrings. Make sure we don't free
+ * In general, nothing in this file should initiate database accesses
+ * nor depend on changeable state (such as SET variables). If you do
+ * database accesses, your code will fail when we have aborted the
+ * current transaction and are just parsing commands to find the next
+ * ROLLBACK or COMMIT. If you make use of SET variables, then you
+ * will do the wrong thing in multi-query strings like this:
+ * SET SQL_inheritance TO off; SELECT * FROM foo;
+ * because the entire string is parsed by gram.y before the SET gets
+ * executed. Anything that depends on the database or changeable state
+ * should be handled inside parse_analyze() so that it happens at the
+ * right time not the wrong time. The handling of SQL_inheritance is
+ * a good example.
+ *
+ * WARNINGS
+ * If you use a list, make sure the datum is a node so that the printing
+ * routines work.
+ *
+ * Sometimes we assign constants to makeStrings. Make sure we don't free
* those.
*
*-------------------------------------------------------------------------
*/
-#include <ctype.h>
-
#include "postgres.h"
+#include <ctype.h>
+
#include "access/htup.h"
-#include "access/xact.h"
#include "catalog/catname.h"
#include "catalog/pg_type.h"
+#include "nodes/params.h"
#include "nodes/parsenodes.h"
-#include "nodes/print.h"
-#include "parser/analyze.h"
#include "parser/gramparse.h"
-#include "parser/parse_type.h"
-#include "storage/bufpage.h"
#include "storage/lmgr.h"
#include "utils/acl.h"
#include "utils/numeric.h"
-#include "utils/guc.h"
#ifdef MULTIBYTE
-#include "miscadmin.h"
#include "mb/pg_wchar.h"
#else
#define GetStandardEncoding() 0 /* SQL_ASCII */
char *str;
bool boolean;
JoinType jtype;
+ InhOption inhOpt;
List *list;
Node *node;
Value *value;
%type <list> stmtblock, stmtmulti,
into_clause, OptTempTableName, relation_name_list,
- OptTableElementList, OptUnder, OptInherit, definition, opt_distinct,
+ OptTableElementList, OptInherit, definition, opt_distinct,
opt_with, func_args, func_args_list, func_as,
oper_argtypes, RuleActionList, RuleActionMulti,
opt_column_list, columnList, opt_va_list, va_list,
%type <list> opt_interval
%type <node> substr_from, substr_for
-%type <boolean> opt_inh_star, opt_binary, opt_using, opt_instead, opt_only
- opt_with_copy, index_opt_unique, opt_verbose, opt_analyze
-%type <boolean> opt_cursor
+%type <boolean> opt_binary, opt_using, opt_instead, opt_cursor
+%type <boolean> opt_with_copy, index_opt_unique, opt_verbose, opt_analyze
+
+%type <inhOpt> opt_inh_star, opt_only
%type <ival> copy_dirn, direction, reindex_type, drop_type,
opt_column, event, comment_type, comment_cl,
PATH_P, PENDANT,
RESTRICT,
TRIGGER,
- UNDER,
WITHOUT
/* Keywords (in SQL92 non-reserved words) */
AlterTableStmt *n = makeNode(AlterTableStmt);
n->subtype = 'A';
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->def = $7;
$$ = (Node *)n;
}
AlterTableStmt *n = makeNode(AlterTableStmt);
n->subtype = 'T';
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->name = $7;
n->def = $8;
$$ = (Node *)n;
AlterTableStmt *n = makeNode(AlterTableStmt);
n->subtype = 'D';
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->name = $7;
n->behavior = $8;
$$ = (Node *)n;
AlterTableStmt *n = makeNode(AlterTableStmt);
n->subtype = 'C';
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->def = $6;
$$ = (Node *)n;
}
AlterTableStmt *n = makeNode(AlterTableStmt);
n->subtype = 'X';
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->name = $7;
n->behavior = $8;
$$ = (Node *)n;
*
*****************************************************************************/
-CreateStmt: CREATE OptTemp TABLE relation_name OptUnder '(' OptTableElementList ')' OptInherit
+CreateStmt: CREATE OptTemp TABLE relation_name '(' OptTableElementList ')' OptInherit
{
CreateStmt *n = makeNode(CreateStmt);
n->istemp = $2;
n->relname = $4;
- n->tableElts = $7;
- n->inhRelnames = nconc($5, $9);
-/* if ($5 != NIL)
- {
- n->inhRelnames = $5;
- }
- else
- { */
- /* INHERITS is deprecated */
- /* n->inhRelnames = $9;
- } */
+ n->tableElts = $6;
+ n->inhRelnames = $8;
n->constraints = NIL;
$$ = (Node *)n;
}
| SET DEFAULT { $$ = FKCONSTR_ON_KEY_SETDEFAULT; }
;
-OptUnder: UNDER relation_name_list { $$ = $2; }
- | /*EMPTY*/ { $$ = NIL; }
+opt_only: ONLY { $$ = INH_NO; }
+ | /*EMPTY*/ { $$ = INH_DEFAULT; }
;
-opt_only: ONLY { $$ = FALSE; }
- | /*EMPTY*/ { $$ = TRUE; }
- ;
-
-/* INHERITS is Deprecated */
-OptInherit: INHERITS '(' relation_name_list ')' { $$ = $3; }
+OptInherit: INHERITS '(' relation_name_list ')' { $$ = $3; }
| /*EMPTY*/ { $$ = NIL; }
;
* SELECT ... INTO.
*/
-CreateAsStmt: CREATE OptTemp TABLE relation_name OptUnder OptCreateAs AS SelectStmt
+CreateAsStmt: CREATE OptTemp TABLE relation_name OptCreateAs AS SelectStmt
{
/*
* When the SelectStmt is a set-operation tree, we must
* to find it. Similarly, the output column names must
* be attached to that Select's target list.
*/
- SelectStmt *n = findLeftmostSelect((SelectStmt *) $8);
+ SelectStmt *n = findLeftmostSelect((SelectStmt *) $7);
if (n->into != NULL)
elog(ERROR,"CREATE TABLE/AS SELECT may not specify INTO");
n->istemp = $2;
n->into = $4;
- if ($5 != NIL)
- elog(ERROR,"CREATE TABLE/AS SELECT does not support UNDER");
- if ($6 != NIL)
- mapTargetColumns($6, n->targetList);
- $$ = $8;
+ if ($5 != NIL)
+ mapTargetColumns($5, n->targetList);
+ $$ = $7;
}
;
*****************************************************************************/
RenameStmt: ALTER TABLE relation_name opt_inh_star
- /* "*" deprecated */
RENAME opt_column opt_name TO name
{
RenameStmt *n = makeNode(RenameStmt);
n->relname = $3;
- n->inh = $4 || SQL_inheritance;
+ n->inhOpt = $4;
n->column = $7;
n->newname = $9;
$$ = (Node *)n;
DeleteStmt: DELETE FROM opt_only relation_name where_clause
{
DeleteStmt *n = makeNode(DeleteStmt);
- n->inh = $3;
+ n->inhOpt = $3;
n->relname = $4;
n->whereClause = $5;
$$ = (Node *)n;
where_clause
{
UpdateStmt *n = makeNode(UpdateStmt);
- n->inh = $2;
+ n->inhOpt = $2;
n->relname = $3;
n->targetList = $5;
n->fromClause = $6;
* ...however, recursive addattr and rename supported. make special
* cases for these.
*/
-opt_inh_star: '*' { $$ = TRUE; }
- | /*EMPTY*/ { $$ = FALSE; }
+opt_inh_star: '*' { $$ = INH_YES; }
+ | /*EMPTY*/ { $$ = INH_DEFAULT; }
;
relation_name_list: name_list;
relation_expr: relation_name
{
- /* default inheritance */
+ /* default inheritance */
$$ = makeNode(RangeVar);
$$->relname = $1;
- $$->inh = SQL_inheritance;
+ $$->inhOpt = INH_DEFAULT;
$$->name = NULL;
}
| relation_name '*' %prec '='
/* inheritance query */
$$ = makeNode(RangeVar);
$$->relname = $1;
- $$->inh = TRUE;
+ $$->inhOpt = INH_YES;
$$->name = NULL;
}
| ONLY relation_name %prec '='
/* no inheritance */
$$ = makeNode(RangeVar);
$$->relname = $2;
- $$->inh = FALSE;
+ $$->inhOpt = INH_NO;
$$->name = NULL;
}
;
| TRIGGER { $$ = "trigger"; }
| TRUNCATE { $$ = "truncate"; }
| TRUSTED { $$ = "trusted"; }
- | UNDER { $$ = "under"; }
| UNLISTEN { $$ = "unlisten"; }
| UNTIL { $$ = "until"; }
| UPDATE { $$ = "update"; }
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.86 2000/12/15 23:36:19 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.87 2001/01/05 06:34:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
{"truncate", TRUNCATE},
{"trusted", TRUSTED},
{"type", TYPE_P},
- {"under", UNDER},
{"union", UNION},
{"unique", UNIQUE},
{"unlisten", UNLISTEN},
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.73 2000/11/16 22:30:27 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.74 2001/01/05 06:34:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "parser/parse_relation.h"
#include "parser/parse_target.h"
#include "parser/parse_type.h"
+#include "utils/guc.h"
+
#define ORDER_CLAUSE 0
#define GROUP_CLAUSE 1
pstate->p_target_rangetblentry = rte;
}
+/*
+ * Simplify InhOption (yes/no/default) into boolean yes/no.
+ *
+ * The reason we do things this way is that we don't want to examine the
+ * SQL_inheritance option flag until parse_analyze is run. Otherwise,
+ * we'd do the wrong thing with query strings that intermix SET commands
+ * with queries.
+ */
+bool
+interpretInhOption(InhOption inhOpt)
+{
+ switch (inhOpt)
+ {
+ case INH_NO:
+ return false;
+ case INH_YES:
+ return true;
+ case INH_DEFAULT:
+ return SQL_inheritance;
+ }
+ elog(ERROR, "Bogus InhOption value");
+ return false; /* keep compiler quiet */
+}
/*
* Extract all not-in-common columns from column lists of a source table
* automatically generate the range variable if not specified. However
* there are times we need to know whether the entries are legitimate.
*/
- rte = addRangeTableEntry(pstate, relname, r->name, r->inh, true);
+ rte = addRangeTableEntry(pstate, relname, r->name,
+ interpretInhOption(r->inhOpt), true);
/*
* We create a RangeTblRef, but we do not add it to the joinlist here.
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.104 2000/12/08 06:17:58 inoue Exp $
+ * $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.105 2001/01/05 06:34:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "commands/view.h"
#include "miscadmin.h"
#include "parser/parse.h"
+#include "parser/parse_clause.h"
#include "parser/parse_expr.h"
#include "rewrite/rewriteDefine.h"
#include "rewrite/rewriteRemove.h"
renameatt(relname, /* relname */
stmt->column, /* old att name */
stmt->newname, /* new att name */
- stmt->inh); /* recursive? */
+ interpretInhOption(stmt->inhOpt)); /* recursive? */
}
}
break;
switch (stmt->subtype)
{
case 'A': /* ADD COLUMN */
- AlterTableAddColumn(stmt->relname, stmt->inh, (ColumnDef *) stmt->def);
+ AlterTableAddColumn(stmt->relname,
+ interpretInhOption(stmt->inhOpt),
+ (ColumnDef *) stmt->def);
break;
case 'T': /* ALTER COLUMN */
- AlterTableAlterColumn(stmt->relname, stmt->inh, stmt->name, stmt->def);
+ AlterTableAlterColumn(stmt->relname,
+ interpretInhOption(stmt->inhOpt),
+ stmt->name,
+ stmt->def);
break;
case 'D': /* ALTER DROP */
- AlterTableDropColumn(stmt->relname, stmt->inh, stmt->name, stmt->behavior);
+ AlterTableDropColumn(stmt->relname,
+ interpretInhOption(stmt->inhOpt),
+ stmt->name,
+ stmt->behavior);
break;
case 'C': /* ADD CONSTRAINT */
- AlterTableAddConstraint(stmt->relname, stmt->inh, stmt->def);
+ AlterTableAddConstraint(stmt->relname,
+ interpretInhOption(stmt->inhOpt),
+ stmt->def);
break;
case 'X': /* DROP CONSTRAINT */
- AlterTableDropConstraint(stmt->relname, stmt->inh, stmt->name, stmt->behavior);
+ AlterTableDropConstraint(stmt->relname,
+ interpretInhOption(stmt->inhOpt),
+ stmt->name,
+ stmt->behavior);
break;
case 'E': /* CREATE TOAST TABLE */
- AlterTableCreateToastTable(stmt->relname, false);
+ AlterTableCreateToastTable(stmt->relname,
+ false);
break;
case 'U': /* ALTER OWNER */
- AlterTableOwner(stmt->relname, stmt->name);
+ AlterTableOwner(stmt->relname,
+ stmt->name);
break;
default: /* oops */
elog(ERROR, "T_AlterTableStmt: unknown subtype");
\[, PRIMARY KEY ( column \[, ...\] ) \]
\[, CHECK ( condition ) \]
\[, table_constraint_clause \]
- ) \[ UNDER inherited_table \[, ...\] \]
+ ) \[ INHERITS ( inherited_table \[, ...\] ) \]
" {code} "
TEMPORARY
The table is created only for this session, and is automatically dropped on session exit. Existing permanent tables with the same name are not visible while the temporary table exists.
CREATE TABLE capitals (
state char2
- ) UNDER cities;
+ ) INHERITS (cities);
" {code} "
In this case, an instance of capitals inherits all attributes (name, population, and altitude) from its parent, cities. The type of the attribute name is text, a native Postgres type for variable length ASCII strings. The type of the attribute population is float, a native Postgres type for double precision floating point numbers. State capitals have an extra attribute, state, that shows their state. In Postgres, a class can inherit from zero or more other classes, and a query can reference either all instances of a class or all instances of a class plus all of its descendants.
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: parsenodes.h,v 1.122 2000/11/24 20:16:40 petere Exp $
+ * $Id: parsenodes.h,v 1.123 2001/01/05 06:34:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
} Query;
+typedef enum InhOption
+{
+ INH_NO, /* Do NOT scan child tables */
+ INH_YES, /* DO scan child tables */
+ INH_DEFAULT /* Use current SQL_inheritance option */
+} InhOption;
+
/*****************************************************************************
* Other Statements (no optimizations required)
*
/* ----------------------
* Alter Table
+ *
+ * The fields are used in different ways by the different variants of
+ * this command.
* ----------------------
*/
-/* The fields are used in different ways by the different variants of this command */
typedef struct AlterTableStmt
{
NodeTag type;
* E = add toast table,
* U = change owner */
char *relname; /* table to work on */
- bool inh; /* recursively on children? */
+ InhOption inhOpt; /* recursively act on children? */
char *name; /* column or constraint name to act on, or new owner */
Node *def; /* definition of new column or constraint */
int behavior; /* CASCADE or RESTRICT drop behavior */
{
NodeTag type;
char *relname; /* relation to be altered */
- bool inh; /* recursively alter children? */
+ InhOption inhOpt; /* recursively act on children? */
char *column; /* if NULL, rename the relation name to
* the new name. Otherwise, rename this
* column name. */
NodeTag type;
char *relname; /* relation to delete from */
Node *whereClause; /* qualifications */
- bool inh; /* delete from subclasses */
+ InhOption inhOpt; /* recursively act on children? */
} DeleteStmt;
/* ----------------------
List *targetList; /* the target list (of ResTarget) */
Node *whereClause; /* qualifications */
List *fromClause; /* the from clause */
- bool inh; /* update subclasses */
+ InhOption inhOpt; /* recursively act on children? */
} UpdateStmt;
/* ----------------------
{
NodeTag type;
char *relname; /* the relation name */
- bool inh; /* expand rel by inheritance? */
+ InhOption inhOpt; /* expand rel by inheritance? */
Attr *name; /* optional table alias & column aliases */
} RangeVar;
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: parse_clause.h,v 1.20 2000/11/08 22:10:02 tgl Exp $
+ * $Id: parse_clause.h,v 1.21 2001/01/05 06:34:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
extern void lockTargetTable(ParseState *pstate, char *relname);
extern void setTargetTable(ParseState *pstate, char *relname,
bool inh, bool inJoinSet);
+extern bool interpretInhOption(InhOption inhOpt);
extern Node *transformWhereClause(ParseState *pstate, Node *where);
extern List *transformGroupClause(ParseState *pstate, List *grouplist,
List *targetlist);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/ecpg/preproc/keywords.c,v 1.34 2000/12/18 11:33:55 meskes Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/ecpg/preproc/keywords.c,v 1.35 2001/01/05 06:34:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
{"truncate", TRUNCATE},
{"trusted", TRUSTED},
{"type", TYPE_P},
- {"under", UNDER},
{"union", UNION},
{"unique", UNIQUE},
{"unlisten", UNLISTEN},
OPERATOR, OWNER, PASSWORD, PROCEDURAL, REINDEX, RENAME, RESET,
RETURNS, ROW, RULE, SEQUENCE, SERIAL, SETOF, SHARE,
SHOW, START, STATEMENT, STDIN, STDOUT, SYSID TEMP,
- TEMPLATE, TOAST, TRUNCATE, TRUSTED, UNDER, UNLISTEN, UNTIL, VACUUM,
+ TEMPLATE, TOAST, TRUNCATE, TRUSTED, UNLISTEN, UNTIL, VACUUM,
VALID, VERBOSE, VERSION
/* The grammar thinks these are keywords, but they are not in the keywords.c
%type <str> Iconst Fconst Sconst TransactionStmt CreateStmt UserId
%type <str> CreateAsElement OptCreateAs CreateAsList CreateAsStmt
-%type <str> OptUnder key_reference comment_text ConstraintDeferrabilitySpec
+%type <str> key_reference comment_text ConstraintDeferrabilitySpec
%type <str> key_match ColLabel SpecialRuleRelation ColId columnDef
%type <str> ColConstraint ColConstraintElem drop_type Bitconst
%type <str> OptTableElementList OptTableElement TableConstraint
*
*****************************************************************************/
-CreateStmt: CREATE OptTemp TABLE relation_name OptUnder '(' OptTableElementList ')'
+CreateStmt: CREATE OptTemp TABLE relation_name '(' OptTableElementList ')'
OptInherit
{
- $$ = cat_str(9, make_str("create"), $2, make_str("table"), $4, $5, make_str("("), $7, make_str(")"), $9);
+ $$ = cat_str(8, make_str("create"), $2, make_str("table"), $4, make_str("("), $6, make_str(")"), $8);
}
;
| SET NULL_P { $$ = make_str("set null"); }
;
-OptUnder: UNDER relation_name_list { $$ = cat2_str(make_str("under"), $2); }
- | /*EMPTY*/ { $$ = EMPTY; }
- ;
-
opt_only: ONLY { $$ = make_str("only"); }
| /*EMPTY*/ { $$ = EMPTY; }
;
-/* INHERITS is Deprecated */
OptInherit: INHERITS '(' relation_name_list ')' { $$ = cat_str(3, make_str("inherits ("), $3, make_str(")")); }
| /*EMPTY*/ { $$ = EMPTY; }
;
* SELECT ... INTO.
*/
-CreateAsStmt: CREATE OptTemp TABLE relation_name OptUnder OptCreateAs AS SelectStmt
+CreateAsStmt: CREATE OptTemp TABLE relation_name OptCreateAs AS SelectStmt
{
if (FoundInto == 1)
mmerror(ET_ERROR, "CREATE TABLE/AS SELECT may not specify INTO");
- if (strlen($5) > 0)
- mmerror(ET_ERROR, "CREATE TABLE/AS SELECT does not support UNDER");
-
- $$ = cat_str(8, make_str("create"), $2, make_str("table"), $4, $5, $6, make_str("as"), $8);
+ $$ = cat_str(7, make_str("create"), $2, make_str("table"), $4, $5, make_str("as"), $7);
}
;
| TRIGGER { $$ = make_str("trigger"); }
| TRUNCATE { $$ = make_str("truncate"); }
| TRUSTED { $$ = make_str("trusted"); }
- | UNDER { $$ = make_str("under"); }
| UNLISTEN { $$ = make_str("unlisten"); }
| UNTIL { $$ = make_str("until"); }
| UPDATE { $$ = make_str("update"); }
-- Test inheritance features
--
CREATE TABLE a (aa TEXT);
-CREATE TABLE b UNDER a (bb TEXT);
-CREATE TABLE c UNDER a (cc TEXT);
-CREATE TABLE d UNDER b,c,a (dd TEXT);
+CREATE TABLE b (bb TEXT) INHERITS (a);
+CREATE TABLE c (cc TEXT) INHERITS (a);
+CREATE TABLE d (dd TEXT) INHERITS (b,c,a);
INSERT INTO a(aa) VALUES('aaa');
INSERT INTO a(aa) VALUES('aaaa');
INSERT INTO a(aa) VALUES('aaaaa');
-- Test inheritance features
--
CREATE TABLE a (aa TEXT);
-CREATE TABLE b UNDER a (bb TEXT);
-CREATE TABLE c UNDER a (cc TEXT);
-CREATE TABLE d UNDER b,c,a (dd TEXT);
+CREATE TABLE b (bb TEXT) INHERITS (a);
+CREATE TABLE c (cc TEXT) INHERITS (a);
+CREATE TABLE d (dd TEXT) INHERITS (b,c,a);
INSERT INTO a(aa) VALUES('aaa');
INSERT INTO a(aa) VALUES('aaaa');
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