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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2002-08-24 15:00:47 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2002-08-24 15:00:47 +0000 |
| commit | 976246cc7e4d8b673fc62fe6daa61c76d94af1af (patch) | |
| tree | b61ea3f5bbd8fa025587754bc90c3fd43889337c /doc/src | |
| parent | cf4d885c67744637d82f6fec657e8205578c5905 (diff) | |
| download | postgresql-976246cc7e4d8b673fc62fe6daa61c76d94af1af.tar.gz postgresql-976246cc7e4d8b673fc62fe6daa61c76d94af1af.zip | |
The cstring datatype can now be copied, passed around, etc. The typlen
value '-2' is used to indicate a variable-width type whose width is
computed as strlen(datum)+1. Everything that looks at typlen is updated
except for array support, which Joe Conway is working on; at the moment
it wouldn't work to try to create an array of cstring.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/catalogs.sgml | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml index e62493b5257..58027891c82 100644 --- a/doc/src/sgml/catalogs.sgml +++ b/doc/src/sgml/catalogs.sgml @@ -1,6 +1,6 @@ <!-- Documentation of the system catalogs, directed toward PostgreSQL developers - $Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.53 2002/08/13 17:22:08 petere Exp $ + $Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.54 2002/08/24 15:00:45 tgl Exp $ --> <chapter id="catalogs"> @@ -3173,7 +3173,13 @@ <entry>typlen</entry> <entry><type>int2</type></entry> <entry></entry> - <entry>Length of the storage representation of the type, -1 if variable length</entry> + <entry> + For a fixed-size type, <structfield>typlen</structfield> is the number + of bytes in the internal representation of the type. But for a + variable-length type, <structfield>typlen</structfield> is negative. + -1 indicates a <quote>varlena</> type (one that has a length word), + -2 indicates a null-terminated C string. + </entry> </row> <row> @@ -3325,7 +3331,7 @@ <entry><type>char</type></entry> <entry></entry> <entry><para> - <structfield>typstorage</structfield> tells for variable-length + <structfield>typstorage</structfield> tells for varlena types (those with <structfield>typlen</structfield> = -1) if the type is prepared for toasting and what the default strategy for attributes of this type should be. |