<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Store 'postgresql'</title> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2"> <link rel="start" href="index.html" title="Redland RDF Library Manual"> <link rel="up" href="redland-storage-modules.html" title="Storage Modules"> <link rel="prev" href="redland-storage-module-mysql.html" title="Store 'mysql'"> <link rel="next" href="redland-storage-module-sqlite.html" title="Store 'sqlite'"> <meta name="generator" content="GTK-Doc V1.10 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> <link rel="chapter" href="redland.html" title="Redland Overview"> <link rel="chapter" href="introduction.html" title="Introduction"> <link rel="part" href="tutorial.html" title="Part I. Tutorial"> <link rel="part" href="reference-manual.html" title="Part II. 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This store provides storage using the <a class="ulink" href="http://www.postgresql.org/" target="_top">PostgreSQL</a> open source database including contexts. This store was added in Redland 1.0.3.</p> <p>There are several options required with the postgresql storage in order to connect to the database. These are:</p> <div class="itemizedlist"><ul type="disc"> <li><p><code class="literal">host</code> for the database server hostname</p></li> <li><p><code class="literal">port</code> for the database server port (defaults to the Postgresql port 3306 if not given)</p></li> <li><p><code class="literal">database</code> for the Postgresql database name (not the storage name)</p></li> <li><p><code class="literal">user</code> for the database server user name</p></li> <li><p><code class="literal">password</code> for the database server password</p></li> <li><p><code class="literal">database</code> for the Postgresql database name (not the storage name)</p></li> </ul></div> <p>NOTE: Before Redland 1.0.5, the parameter <code class="literal">dbname</code> had to be used instead of <code class="literal">database</code> for the Postgresql database name.</p> <p>NOTE: Take care exposing the password as for example, program arguments or environment variables. The rdfproc utility can with help this by reading the password from standard input. Inside programs, one way to prevent storing the password in a string is to construct a Redland hash of the storage options such as via <code class="literal">librdf_hash_from_string</code> and use <code class="literal">librdf_new_storage_with_options</code> to create a storage. The rdfproc utility source code demonstrates this. </p> <p>The storage name parameter given to the storage constructor <code class="literal">librdf_new_storage</code> is used inside the postgresql store to allow multiple stores inside one PostgreSQL database instance as parameterised with the above optiosn.</p> <p>If boolean option <code class="literal">new</code> is given, any existing PostgreSQL database named by the storage option <code class="literal">database</code>, say <span class="emphasis"><em>db</em></span> will be dropped and the appropriate new tables created. The PostgreSQL database <span class="emphasis"><em>db</em></span> must already exist, such as made with the PostgreSQL <code class="literal">create database </code><span class="emphasis"><em>db</em></span> command and the appropriate priviledges set so that the user and password work.</p> <p>This store always provides contexts; the boolean storage option <code class="literal">contexts</code> is not checked.</p> <p>Examples:</p> <pre class="programlisting"> /* A new PostgreSQL store */ storage=librdf_new_storage(world, "postgresql", "db1", "new='yes',host='localhost',database='red',user='foo','password='bar'"); /* A different, existing PostgreSQL store db2 in the same database as above */ storage=librdf_new_storage(world, "postgresql", "db2", "host='localhost',database='red',user='foo','password='bar'"); /* An existing PostgreSQL store on a different database server */ storage=librdf_new_storage(world, "postgresql", "db3", "host='db.example.org',database='abc',user='baz','password='blah'"); /* Opening with an options hash */ options=librdf_new_hash(world, NULL); librdf_hash_from_string(options, "host='db.example.org',database='abc',user='baz'"); librdf_hash_put_strings(options, "password", user_password); storage=librdf_new_storage_with_options(world, "postgresql", "db4", options); </pre> <p>In PHP:</p> <pre class="programlisting"> # An existing store $storage=librdf_new_storage($world, 'postgresql', 'db4', "host='127.0.0.1',database='xyz',user='foo',password='blah'"); </pre> <p>Summary:</p> <div class="itemizedlist"><ul type="disc"> <li><p>Persistent</p></li> <li><p>Suitable for very large models</p></li> <li><p>Indexed but not optimised</p></li> <li><p>Smaller disk usage than BDB</p></li> <li><p>Contexts always provided</p></li> </ul></div> </div> <div class="footer"> <hr> Generated by GTK-Doc V1.10</div> </body> </html>