diff options
Diffstat (limited to 'doc/src/sgml/catalogs.sgml')
| -rw-r--r-- | doc/src/sgml/catalogs.sgml | 37 |
1 files changed, 24 insertions, 13 deletions
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml index e70cee4506..0cc355330d 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 2.69 2003/04/15 13:23:35 petere Exp $ + $Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.70 2003/05/08 22:19:55 tgl Exp $ --> <chapter id="catalogs"> @@ -3315,9 +3315,9 @@ <para> The catalog <structname>pg_type</structname> stores information about data types. Base types (scalar types) are created with <command>CREATE TYPE</command>. - A complex type is automatically created for each table in the database, to + A composite type is automatically created for each table in the database, to represent the row structure of the table. It is also possible to create - complex types with <command>CREATE TYPE AS</command> and + composite types with <command>CREATE TYPE AS</command> and derived types with <command>CREATE DOMAIN</command>. </para> @@ -3378,12 +3378,9 @@ <entry> <structfield>typbyval</structfield> determines whether internal routines pass a value of this type by value or by reference. - Only <type>char</type>, <type>short</type>, and - <type>int</type> equivalent items can be passed by value, so if - the type is not 1, 2, or 4 bytes long, - <productname>PostgreSQL</> does not have - the option of passing by value and so - <structfield>typbyval</structfield> had better be false. + <structfield>typbyval</structfield> had better be false if + <structfield>typlen</structfield> is not 1, 2, or 4 (or 8 on machines + where Datum is 8 bytes). Variable-length types are always passed by reference. Note that <structfield>typbyval</structfield> can be false even if the length would allow pass-by-value; this is currently true for @@ -3397,7 +3394,7 @@ <entry></entry> <entry> <structfield>typtype</structfield> is <literal>b</literal> for - a base type, <literal>c</literal> for a complex type (i.e., + a base type, <literal>c</literal> for a composite type (i.e., a table's row type), <literal>d</literal> for a derived type (i.e., a domain), or <literal>p</literal> for a pseudo-type. See also <structfield>typrelid</structfield> @@ -3431,7 +3428,7 @@ <entry><type>oid</type></entry> <entry><literal>pg_class.oid</literal></entry> <entry> - If this is a complex type (see + If this is a composite type (see <structfield>typtype</structfield>), then this column points to the <structname>pg_class</structname> entry that defines the corresponding table. (For a free-standing composite type, the @@ -3468,14 +3465,28 @@ <entry><structfield>typinput</structfield></entry> <entry><type>regproc</type></entry> <entry><literal>pg_proc.oid</literal></entry> - <entry>Input conversion function</entry> + <entry>Input conversion function (text format)</entry> </row> <row> <entry><structfield>typoutput</structfield></entry> <entry><type>regproc</type></entry> <entry><literal>pg_proc.oid</literal></entry> - <entry>Output conversion function</entry> + <entry>Output conversion function (text format)</entry> + </row> + + <row> + <entry><structfield>typreceive</structfield></entry> + <entry><type>regproc</type></entry> + <entry><literal>pg_proc.oid</literal></entry> + <entry>Input conversion function (binary format), or 0 if none</entry> + </row> + + <row> + <entry><structfield>typsend</structfield></entry> + <entry><type>regproc</type></entry> + <entry><literal>pg_proc.oid</literal></entry> + <entry>Output conversion function (binary format), or 0 if none</entry> </row> <row> |