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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-07-07 19:34:24 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-07-07 19:34:24 -0400 |
| commit | 3e80d0d2e5a0f6a7a971ddcb6e38cc8f0079aed7 (patch) | |
| tree | d2d93839b57ae1b71ca9a1091b8fe4698aa86258 | |
| parent | 4eb4b4013d27eaa8bcbd089ce7a20f4bcb2556f3 (diff) | |
| download | postgresql-3e80d0d2e5a0f6a7a971ddcb6e38cc8f0079aed7.tar.gz postgresql-3e80d0d2e5a0f6a7a971ddcb6e38cc8f0079aed7.zip | |
Update examples for string-related functions.
In the example for decode(), show the bytea result in hex format,
since that's now the default. Use an E'' string in the example for
quote_literal(), so that it works regardless of the
standard_conforming_strings setting. On the functions-for-binary-strings
page, leave the examples as-is for readability, but add a note pointing out
that they are shown in escape format. Per comments from Thom Brown.
Also, improve the description for encode() and decode() a tad.
Backpatch to 9.0, where bytea_output was introduced.
| -rw-r--r-- | doc/src/sgml/func.sgml | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 8f223d68913..0b6a9d9542b 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -1482,15 +1482,15 @@ <primary>decode</primary> </indexterm> <literal><function>decode(<parameter>string</parameter> <type>text</type>, - <parameter>type</parameter> <type>text</type>)</function></literal> + <parameter>format</parameter> <type>text</type>)</function></literal> </entry> <entry><type>bytea</type></entry> <entry> - Decode binary data from <parameter>string</parameter> previously - encoded with <function>encode</>. Parameter type is same as in <function>encode</>. + Decode binary data from textual representation in <parameter>string</>. + Options for <parameter>format</> are same as in <function>encode</>. </entry> <entry><literal>decode('MTIzAAE=', 'base64')</literal></entry> - <entry><literal>123\000\001</literal></entry> + <entry><literal>\x3132330001</literal></entry> </row> <row> @@ -1499,13 +1499,13 @@ <primary>encode</primary> </indexterm> <literal><function>encode(<parameter>data</parameter> <type>bytea</type>, - <parameter>type</parameter> <type>text</type>)</function></literal> + <parameter>format</parameter> <type>text</type>)</function></literal> </entry> <entry><type>text</type></entry> <entry> - Encode binary data to different representation. Supported - types are: <literal>base64</>, <literal>hex</>, <literal>escape</>. - <literal>Escape</> merely outputs null bytes as <literal>\000</> and + Encode binary data into a textual representation. Supported + formats are: <literal>base64</>, <literal>hex</>, <literal>escape</>. + <literal>escape</> merely outputs null bytes as <literal>\000</> and doubles backslashes. </entry> <entry><literal>encode(E'123\\000\\001', 'base64')</literal></entry> @@ -1707,7 +1707,7 @@ <function>quote_nullable</function> is often more suitable. See also <xref linkend="plpgsql-quote-literal-example">. </entry> - <entry><literal>quote_literal('O\'Reilly')</literal></entry> + <entry><literal>quote_literal(E'O\'Reilly')</literal></entry> <entry><literal>'O''Reilly'</literal></entry> </row> @@ -2859,6 +2859,14 @@ (see <xref linkend="functions-binarystring-other">). </para> + <note> + <para> + The sample results shown on this page assume that the server parameter + <link linkend="guc-bytea-output"><varname>bytea_output</></link> is set + to <literal>escape</literal> (the traditional PostgreSQL format). + </para> + </note> + <table id="functions-binarystring-sql"> <title><acronym>SQL</acronym> Binary String Functions and Operators</title> <tgroup cols="5"> |