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Commit0839f31

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Change the default value of standard_conforming_strings to on.
This change should be publicized to driver maintainers at once andrelease-noted as an incompatibility with previous releases.
1 parent0b4a086 commit0839f31

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5 files changed

+18
-22
lines changed

5 files changed

+18
-22
lines changed

‎doc/src/sgml/config.sgml‎

Lines changed: 3 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.296 2010/07/16 22:25:47 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.297 2010/07/20 00:34:44 rhaas Exp $ -->
22

33
<chapter Id="runtime-config">
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<title>Server Configuration</title>
@@ -5237,11 +5237,8 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
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This controls whether ordinary string literals
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(<literal>'...'</>) treat backslashes literally, as specified in
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the SQL standard.
5240-
The default is currently <literal>off</>, causing
5241-
<productname>PostgreSQL</productname> to have its historical
5242-
behavior of treating backslashes as escape characters.
5243-
The default will change to <literal>on</> in a future release
5244-
to improve compatibility with the SQL standard.
5240+
Beginning in <productname>PostgreSQL</productname> 9.1, the default is
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<literal>on</> (prior releases defaulted to <literal>off</>).
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Applications can check this
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parameter to determine how string literals will be processed.
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The presence of this parameter can also be taken as an indication

‎doc/src/sgml/syntax.sgml‎

Lines changed: 10 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.147 2010/07/03 02:57:46 rhaas Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.148 2010/07/20 00:34:44 rhaas Exp $ -->
22

33
<chapter id="sql-syntax">
44
<title>SQL Syntax</title>
@@ -445,16 +445,15 @@ SELECT 'foo' 'bar';
445445
If the configuration parameter
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<xref linkend="guc-standard-conforming-strings"> is <literal>off</>,
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then <productname>PostgreSQL</productname> recognizes backslash escapes
448-
in both regular and escape string constants. This is for backward
449-
compatibility with the historical behavior, where backslash escapes
450-
were always recognized.
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Although <varname>standard_conforming_strings</> currently defaults to
452-
<literal>off</>, the default will change to <literal>on</> in a future
453-
release for improved standards compliance. Applications are therefore
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encouraged to migrate away from using backslash escapes. If you need
455-
to use a backslash escape to represent a special character, write the
456-
string constant with an <literal>E</> to be sure it will be handled the same
457-
way in future releases.
448+
in both regular and escape string constants. However, as of
449+
<productname>PostgreSQL</> 9.1, the default is <literal>on</>, meaning
450+
that backslash escapes are recognized only in escape string constants.
451+
This behavior is more standards-compliant, but might break applications
452+
which rely on the historical behavior, where backslash escapes
453+
were always recognized. As a workaround, you can set this parameter
454+
to <literal>off</>, but it is better to migrate away from using backslash
455+
escapes. If you need to use a backslash escape to represent a special
456+
character, write the string constant with an <literal>E</>.
458457
</para>
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<para>

‎src/backend/parser/scan.l‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -24,7 +24,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.167 2010/05/30 18:10:41 tgl Exp $
27+
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.168 2010/07/20 00:34:44 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -52,7 +52,7 @@
5252
*/
5353
intbackslash_quote = BACKSLASH_QUOTE_SAFE_ENCODING;
5454
boolescape_string_warning =true;
55-
boolstandard_conforming_strings =false;
55+
boolstandard_conforming_strings =true;
5656

5757
/*
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* Set the type of YYSTYPE.

‎src/backend/utils/misc/guc.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
13-
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.562 2010/07/16 22:25:50 tgl Exp $
13+
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.563 2010/07/20 00:34:44 rhaas Exp $
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*
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*--------------------------------------------------------------------
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*/
@@ -1211,7 +1211,7 @@ static struct config_bool ConfigureNamesBool[] =
12111211
GUC_REPORT
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},
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&standard_conforming_strings,
1214-
false,NULL,NULL
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true,NULL,NULL
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},
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{

‎src/backend/utils/misc/postgresql.conf.sample‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -511,7 +511,7 @@
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#escape_string_warning = on
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#lo_compat_privileges = off
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#sql_inheritance = on
514-
#standard_conforming_strings =off
514+
#standard_conforming_strings =on
515515
#synchronize_seqscans = on
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# - Other Platforms and Clients -

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