Différences

Ci-dessous, les différences entre deux révisions de la page.

--- webdev:wordpress:plugin_dev:database [02/10/2017 17:32] – dolo
+++ webdev:wordpress:plugin_dev:database [13/10/2017 16:17] (Version actuelle) – dolo
@@ Ligne 1: / Ligne 1: @@
+====== Handling database access in a Wordpress plugin ======
+[[https://codex.wordpress.org/Class_Reference/wpdb|Wpdb class]] [[https://developer.wordpress.org/reference/classes/wpdb/|BIS]] [[https://codex.wordpress.org/Data_Validation#Database|Data validation for SQL]]
+=== Get many data ===
+<code linenums>
+	global $wpdb;
+	$sql = "SELECT * FROM " . $wpdb->prefix . "table_name";
+	$result = $wpdb->get_results( $sql );
+</code>
+[[https://developer.wordpress.org/reference/classes/wpdb/get_results/|get_results($query, $output)]]
+=== Get one row of data ===
+<code linenums>
+	global $wpdb;
+	$sql = "SELECT id_truc FROM " . $wpdb->prefix . "table_name WHERE id_truc=" . $_GET['id'];
+	$result = $wpdb->get_row($sql, 'ARRAY_A');
+</code>
+[[https://developer.wordpress.org/reference/classes/wpdb/get_row/|get_row($query, $output, $y)]]
+=== Get the DB prefix ===
+<code linenums>
+global $wpdb;
+// Current site prefix
+echo $wpdb->prefix;
+</code>
+==== Create table at plugin activation if it don't exist  ====
+<code linenums>
+// If in first plugin file
+register_activation_hook( __FILE__ , array($this, 'initDatabase') );
+// If not in first plugin file
+register_activation_hook( ABSPATH . '/wp-content/plugins/atn/atn.php', array($this, 'initDatabase') );
+// ...
+	public function initDatabase()
+	{
+		global $wpdb;
+		// First check if the table already exist
+		$sql = "SHOW TABLES LIKE '" . $wpdb->prefix . "table_name'";
+		$result = $wpdb->query( $sql );
+		// echo $sql . ' = ' . $result . '<br>';
+		if($result == 0)
+		{
+			// echo 'No table found, creating it...<br>';
+			$sql = "CREATE TABLE `" . $wpdb->prefix . "table_name` (
+			  `id_table_name` int(11) NOT NULL,
+			  `filename` varchar(255) CHARACTER SET utf8 NOT NULL,
+			  `category` int(11) NOT NULL,
+			  `serial_numbers` text CHARACTER SET utf8 NOT NULL
+			) ENGINE=InnoDB DEFAULT CHARSET=utf8;";
+			$result = $wpdb->query( $sql );
+			// echo $sql . ' = ' . $result . '<br>';
+			$sql = "ALTER TABLE `" . $wpdb->prefix . "table_name`
+			ADD PRIMARY KEY (`id_table_name`);";
+			$result = $wpdb->query( $sql );
+			// echo $sql . ' = ' . $result . '<br>';
+			$sql = "ALTER TABLE `" . $wpdb->prefix . "table_name`
+			MODIFY `id_service_technique` int(11) NOT NULL AUTO_INCREMENT;";
+			$result = $wpdb->query( $sql );
+			// echo $sql . ' = ' . $result . '<br>';
+		}
+	}
+</code>

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