Add migrate script for the coordinates.

composer.json

@@ -58,7 +58,10 @@
                 "prefix": "core-",
                 "languages_cto": "module/languages",
                 "languages_tx": ".tx"
-            }
+            },
+            "runonce": [
+                "runonce/migrate.php"
+            ]
         }
     }
 }

runonce/migrate.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Netzmacht\Contao\Leaflet\runonce;
+
+/**
+ * Migrate controller.
+ *
+ * @package Netzmacht\Contao\Leaflet\runonce
+ */
+class migrate
+{
+    /**
+     * Execute the migration.
+     *
+     * @return void
+     */
+    public function execute()
+    {
+        $database = \Database::getInstance();
+
+        if ($database->fieldExists('coordinates', 'tl_leaflet_marker')) {
+            $this->createFields($database);
+            $this->convertCoordinates($database);
+        }
+    }
+
+    /**
+     * @param $database
+     *
+     * @param \Database $database The database connection.
+     *
+     * @return array
+     */
+    protected function createFields(\Database $database)
+    {
+        foreach (array('latitude', 'longitude', 'altitude') as $field) {
+            if (!$database->fieldExists('latitude', 'tl_leaflet_marker')) {
+                $database->execute(sprintf('ALTER TABLE tl_leaflet_marker ADD %s float NULL;', $field));
+            }
+        }
+
+    }
+
+    /**
+     * Convert coordinates to new splitted fields.
+     *
+     * @param \Database $database The database connection.
+     *
+     * @return void
+     */
+    private function convertCoordinates(\Database $database)
+    {
+        $query = <<<SQL
+SELECT id,coordinates
+FROM   tl_leaflet_marker
+WHERE  coordinates <> '' AND latitude IS NULL aND longitude IS NULL AND altitude IS NULL
+SQL;
+
+        $result = $database->query($query);
+
+        while ($result->next()) {
+            list($latitude, $longitude, $altitude) = trimsplit(',', $result->coordinates);
+
+            $database
+                ->prepare('UPDATE tl_leaflet_marker %s WHERE id=?')
+                ->set(
+                    array(
+                        'latitude'  => $latitude,
+                        'longitude' => $longitude,
+                        'altitude'  => $altitude
+                    )
+                )
+                ->execute($result->id);
+        }
+    }
+}
+
+$controller = new migrate();
+$controller->execute();