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><DIV
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><H1
CLASS="title"
>CXLVIII. PostgreSQL Session Save Handler</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN207423"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.intro"
>简介</A
></H1
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>本扩展模块在 Windows 平台下不可用。</P
></BLOCKQUOTE
></DIV
><P
> This module provides an additional session save handler for the
<A
HREF="ref.session.html"
>session</A
>
module using <A
HREF="http://www.postgresql.org/"
TARGET="_top"
>PostgreSQL</A
> as a
storage system. A <TT
CLASS="literal"
>user-level</TT
> session storage function may
also be used - <A
HREF="function.session-set-save-handler.html"
><B
CLASS="function"
>session_set_save_handler()</B
></A
>, but this module is
written in C and therefore could be twice as fast, compared to
a session save handler written in PHP.
</P
><P
> Session PgSQL is designed to scale any size of web sites and offers some
advanced features:
<P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
>session tables are created automatically</TD
></TR
><TR
><TD
>automatic session table vacuum</TD
></TR
><TR
><TD
>better garbage collection</TD
></TR
><TR
><TD
>multiple PostgreSQL servers support</TD
></TR
><TR
><TD
>automatic database server failover (switching)</TD
></TR
><TR
><TD
> automatic database server load balancing if there are multiple
PostgreSQL servers.
</TD
></TR
><TR
><TD
>short circuit UPDATE</TD
></TR
></TBODY
></TABLE
><P
></P
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.requirements"
>需求</A
></H1
><P
> You need at least PHP >= 4.3.0, and PostgreSQL >=7.2.0 as database
server. <TT
CLASS="literal"
>libpq</TT
> that comes with PostgreSQL 7.2.0 or
later (and header files to build) and <A
HREF="http://www.ossp.org/pkg/lib/mm/"
TARGET="_top"
>libmm</A
>
(and header files).
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.installation"
>安装</A
></H1
><P
> Short installation note:
<P
></P
><UL
><LI
><P
> Untar the <TT
CLASS="literal"
>tar.gz</TT
> archive into
<TT
CLASS="filename"
>php4/ext</TT
> (Latest official releases
can be found at SourceForge
<A
HREF="http://sourceforge.net/projects/phpform-ext/"
TARGET="_top"
>PHP Form Extension Project</A
>)
</P
></LI
><LI
><P
> If the new directory is now called something like
<TT
CLASS="literal"
>session_pgsql</TT
>. You should name it to
<TT
CLASS="literal"
>session_pgsql</TT
> (except you only want to build it as
self-contained php-module).
</P
></LI
><LI
><P
>Run <KBD
CLASS="userinput"
>./buildconf</KBD
> in php4</P
></LI
><LI
><P
> Run <KBD
CLASS="userinput"
>configure</KBD
>
<CODE
CLASS="option"
>--with-session-pgsql</CODE
> (and your other
options)
</P
></LI
><LI
><P
><KBD
CLASS="userinput"
>make; make install</KBD
></P
></LI
></UL
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.configuration"
>运行时配置</A
></H1
><P
>这些函数的行为受 <TT
CLASS="filename"
>php.ini</TT
> 的影响。</P
><P
> PostgreSQL session save handler is still under development. Refer to the
<TT
CLASS="filename"
>README</TT
> file in the source distribution for
configuration details.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.tables"
>Table definitions</A
></H1
><P
>Session table definition
<TABLE
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><TD
><PRE
CLASS="sql"
>CREATE TABLE php_session (
sess_id text,
sess_name text,
sess_data text,
sess_created integer,
sess_modified integer,
sess_expire integer,
sess_addr_created text,
sess_addr_modified text,
sess_counter integer,
sess_error integer,
sess_warning integer,
sess_notice integer,
sess_err_message text,
sess_custom text
);
CREATE INDEX php_session_idx ON php_session USING BTREE (sess_id);</PRE
></TD
></TR
></TABLE
>
</P
><DIV
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><P
></P
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><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
> If you use <TT
CLASS="literal"
>HASH</TT
> for <TT
CLASS="literal"
>INDEX</TT
>, you'll
have a deadlock problem when the server load is
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>very</I
></SPAN
> high. Even if it's unlikely to have a deadlock
under normal operation, it can occur. <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Do not use
<TT
CLASS="literal"
>HASH</TT
> for <TT
CLASS="literal"
>INDEX</TT
></I
></SPAN
>.
</P
></TD
></TR
></TABLE
></DIV
><P
> You may change the session table as long as all fields are defined.
</P
><P
> Application variables table definition
<TABLE
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BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="sql"
>CREATE TABLE php_app_vars (
app_modified integer,
app_name text,
app_vars text
);</PRE
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="session-pgsql.contact"
>Contact Information</A
></H1
><P
> I have at the moment not very much time to further develop this
extension. I will implement more and more features in the near future.
</P
><P
> If you have comments, bug fixes, enhancements or want to help developing
this, you can drop me a mail at
<A
HREF="mailto:yohgaki@php.net"
TARGET="_top"
>yohgaki@php.net</A
>. Any help is
very welcome.
</P
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.session-pgsql-add-error.html"
>session_pgsql_add_error</A
> -- Increments error counts and sets last error message</DT
><DT
><A
HREF="function.session-pgsql-get-error.html"
>session_pgsql_get_error</A
> -- Returns number of errors and last error message</DT
><DT
><A
HREF="function.session-pgsql-get-field.html"
>session_pgsql_get_field</A
> -- Get custom field value</DT
><DT
><A
HREF="function.session-pgsql-reset.html"
>session_pgsql_reset</A
> -- Reset connection to session database servers</DT
><DT
><A
HREF="function.session-pgsql-set-field.html"
>session_pgsql_set_field</A
> -- Set custom field value</DT
><DT
><A
HREF="function.session-pgsql-status.html"
>session_pgsql_status</A
> -- Get current save handler status</DT
></DL
></DIV
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