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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@64852 c90b9560-bf6c-de11-be94-00142212c4b1
320 lines
9.4 KiB
XML
320 lines
9.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.15 $ -->
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<reference id="ref.dbm">
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<title>DBM Functions</title>
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<titleabbrev>DBM</titleabbrev>
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<partintro>
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<simpara>
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These functions allow you to store records stored in a dbm-style
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database. This type of database (supported by the Berkeley DB,
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GDBM, and some system libraries, as well as a built-in flatfile
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library) stores key/value pairs (as opposed to the full-blown
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records supported by relational databases).
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</simpara>
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<para>
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<example>
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<title>DBM example</title>
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<programlisting role="php">
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<![CDATA[
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$dbm = dbmopen ("lastseen", "w");
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if (dbmexists ($dbm, $userid)) {
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$last_seen = dbmfetch ($dbm, $userid);
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} else {
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dbminsert ($dbm, $userid, time());
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}
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do_stuff();
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dbmreplace ($dbm, $userid, time());
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dbmclose ($dbm);
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]]>
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</programlisting>
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</example>
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</para>
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</partintro>
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<refentry id="function.dbmopen">
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<refnamediv>
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<refname>dbmopen</refname>
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<refpurpose>Opens a DBM database</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>dbmopen</function></funcdef>
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<paramdef>string <parameter>filename</parameter></paramdef>
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<paramdef>string <parameter>flags</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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The first argument is the full-path filename of the DBM file to
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be opened and the second is the file open mode which is one of
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"r", "n", "c" or "w" for read-only, new (implies read-write, and
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most likely will truncate an already-existing database of the
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same name), create (implies read-write, and will not truncate an
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already-existing database of the same name) and read-write
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respectively.
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</para>
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<para>
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Returns an identifer to be passed to the other DBM functions on
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success, or &false; on failure.
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</para>
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<para>
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If NDBM support is used, NDBM will actually create filename.dir
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and filename.pag files. GDBM only uses one file, as does the
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internal flat-file support, and Berkeley DB creates a
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<filename>filename.db</filename> file. Note that PHP does its own
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file locking in addition to any file locking that may be done by
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the DBM library itself. PHP does not delete the
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<filename>.lck</filename> files it creates. It uses these files
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simply as fixed inodes on which to do the file locking. For more
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information on DBM files, see your Unix man pages, or obtain
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<ulink url="&url.gdbm;">GNU's GDBM</ulink>.
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</para>
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¬e.sm.uidcheck;
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</refsect1>
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</refentry>
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<refentry id="function.dbmclose">
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<refnamediv>
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<refname>dbmclose</refname>
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<refpurpose>Closes a dbm database</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>bool <function>dbmclose</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Unlocks and closes the specified database.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmexists">
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<refnamediv>
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<refname>dbmexists</refname>
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<refpurpose>
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Tells if a value exists for a key in a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>bool <function>dbmexists</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Returns &true; if there is a value associated with the
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<parameter>key</parameter>.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmfetch">
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<refnamediv>
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<refname>dbmfetch</refname>
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<refpurpose>
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Fetches a value for a key from a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>string <function>dbmfetch</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Returns the value associated with <parameter>key</parameter>.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbminsert">
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<refnamediv>
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<refname>dbminsert</refname>
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<refpurpose>
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Inserts a value for a key in a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>dbminsert</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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<paramdef>string <parameter>value</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Adds the value to the database with the specified key.
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</para>
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<para>
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Returns -1 if the database was opened read-only, 0 if the insert
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was successful, and 1 if the specified key already exists. (To
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replace the value, use <function>dbmreplace</function>.)
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmreplace">
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<refnamediv>
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<refname>dbmreplace</refname>
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<refpurpose>
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Replaces the value for a key in a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>dbmreplace</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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<paramdef>string <parameter>value</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Replaces the value for the specified key in the database.
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</para>
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<para>
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This will also add the key to the database if it didn't already
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exist.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmdelete">
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<refnamediv>
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<refname>dbmdelete</refname>
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<refpurpose>
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Deletes the value for a key from a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>bool <function>dbmdelete</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Deletes the value for <parameter>key</parameter> in the database.
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</para>
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<para>
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Returns &false; if the key didn't exist in the database.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmfirstkey">
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<refnamediv>
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<refname>dbmfirstkey</refname>
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<refpurpose>
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Retrieves the first key from a DBM database
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>string <function>dbmfirstkey</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Returns the first key in the database. Note that no particular order
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is guaranteed since the database may be built using a hash-table,
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which doesn't guarantee any ordering.
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dbmnextkey">
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<refnamediv>
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<refname>dbmnextkey</refname>
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<refpurpose>
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Retrieves the next key from a DBM database</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>string <function>dbmnextkey</function></funcdef>
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<paramdef>int <parameter>dbm_identifier</parameter></paramdef>
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<paramdef>string <parameter>key</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Returns the next key after <parameter>key</parameter>. By calling
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<function>dbmfirstkey</function> followed by successive
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calls to <function>dbmnextkey</function> it is possible to
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visit every key/value pair in the dbm database. For example:
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<example>
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<title>Visiting every key/value pair in a DBM database</title>
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<programlisting role="php">
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<![CDATA[
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$key = dbmfirstkey ($dbm_id);
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while ($key) {
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echo "$key = " . dbmfetch ($dbm_id, $key) . "\n";
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$key = dbmnextkey ($dbm_id, $key);
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}
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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</refentry>
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<refentry id="function.dblist">
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<refnamediv>
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<refname>dblist</refname>
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<refpurpose>
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Describes the DBM-compatible library being used
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>string <function>dblist</function></funcdef>
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<void/>
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</funcprototype>
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</funcsynopsis>
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</refsect1>
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</refentry>
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</reference>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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