diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/datatype.sgml | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml index e4f3f7adabd..10ea9bfccb8 100644 --- a/doc/src/sgml/datatype.sgml +++ b/doc/src/sgml/datatype.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.106.2.3 2003/01/29 01:09:03 tgl Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.106.2.4 2003/11/30 20:52:37 joe Exp $ --> <chapter id="datatype"> @@ -1035,7 +1035,8 @@ SELECT b, char_length(b) FROM test2; strings are distinguished from characters strings by two characteristics: First, binary strings specifically allow storing octets of zero value and other <quote>non-printable</quote> - octets. Second, operations on binary strings process the actual + octets (defined as octets outside the range 32 to 126). + Second, operations on binary strings process the actual bytes, whereas the encoding and processing of character strings depends on locale settings. </para> @@ -1089,12 +1090,23 @@ SELECT b, char_length(b) FROM test2; <entry><literal>\\</literal></entry> </row> + <row> + <entry>0 to 31 and 127 to 255</entry> + <entry><quote>non-printable</quote> octets</entry> + <entry><literal>'\\<replaceable>xxx'</></literal> (octal value)</entry> + <entry><literal>SELECT '\\001'::bytea;</literal></entry> + <entry><literal>\001</literal></entry> + </row> + </tbody> </tgroup> </table> <para> - Note that the result in each of the examples in <xref linkend="datatype-binary-sqlesc"> was exactly one + The requirement to escape <quote>non-printable</quote> octets actually + varies depending on locale settings. In some instances you can get away + with leaving them unescaped. Note that the result in each of the + examples in <xref linkend="datatype-binary-sqlesc"> was exactly one octet in length, even though the output representation of the zero octet and backslash are more than one character. <type>Bytea</type> output octets are also escaped. In general, each @@ -1140,7 +1152,7 @@ SELECT b, char_length(b) FROM test2; <row> <entry>32 to 126</entry> <entry><quote>printable</quote> octets</entry> - <entry>ASCII representation</entry> + <entry>client character set representation</entry> <entry><literal>SELECT '\\176'::bytea;</literal></entry> <entry><literal>~</literal></entry> </row> |