mirror of
https://github.com/sigmasternchen/php-doc-en
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cffb5f5289
Provided by petk. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@347649 c90b9560-bf6c-de11-be94-00142212c4b1
142 lines
3.2 KiB
XML
142 lines
3.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter xml:id="pgsql.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="pgsql.examples-basic">
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<title>Basic usage</title>
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<para>
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This simple example shows how to connect, execute a query, print
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resulting rows and disconnect from a PostgreSQL database.
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<example>
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<title>PostgreSQL extension overview example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Connecting, selecting database
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$dbconn = pg_connect("host=localhost dbname=publishing user=www password=foo")
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or die('Could not connect: ' . pg_last_error());
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// Performing SQL query
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$query = 'SELECT * FROM authors';
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$result = pg_query($query) or die('Query failed: ' . pg_last_error());
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// Printing results in HTML
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echo "<table>\n";
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while ($line = pg_fetch_array($result, null, PGSQL_ASSOC)) {
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echo "\t<tr>\n";
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foreach ($line as $col_value) {
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echo "\t\t<td>$col_value</td>\n";
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}
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echo "\t</tr>\n";
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}
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echo "</table>\n";
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// Free resultset
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pg_free_result($result);
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// Closing connection
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pg_close($dbconn);
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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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</section>
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<section xml:id="pgsql.examples-queries">
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<title>Basic usage</title>
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<para>
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These examples contain user defined functions similar to legacy MySQL
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functions.
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<example>
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<title>PostgreSQL user defined functions example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// This function should be needed, since PostgreSQL connection binds database.
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function pg_list_dbs($db)
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{
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assert(is_resource($db));
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$query = '
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SELECT
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d.datname as "Name",
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u.usename as "Owner",
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pg_encoding_to_char(d.encoding) as "Encoding"
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FROM
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pg_database d LEFT JOIN pg_user u ON d.datdba = u.usesysid
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ORDER BY 1;
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';
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return pg_query($db, $query);
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}
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// List tables.
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function pg_list_tables($db)
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{
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assert(is_resource($db));
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$query = "
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SELECT
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c.relname as \"Name\",
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CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' THEN 'special' END as \"Type\",
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u.usename as \"Owner\"
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FROM
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pg_class c LEFT JOIN pg_user u ON c.relowner = u.usesysid
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WHERE
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c.relkind IN ('r','v','S','')
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AND c.relname !~ '^pg_'
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ORDER BY 1;
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";
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return pg_query($db, $query);
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}
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// See also pg_meta_data(). It returns field definition as array.
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function pg_list_fields($db, $table)
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{
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assert(is_resource($db));
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$query = "
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SELECT
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a.attname,
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format_type(a.atttypid, a.atttypmod),
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a.attnotnull,
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a.atthasdef,
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a.attnum
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FROM
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pg_class c,
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pg_attribute a
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WHERE
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c.relname = '".$table."'
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AND a.attnum > 0 AND a.attrelid = c.oid
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ORDER BY a.attnum;
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";
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return pg_query($db, $query);
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}
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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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</section>
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</chapter>
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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:"~/.phpdoc/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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