From cc2e2507194298b89ad7ca7a6304423d86e3a87b Mon Sep 17 00:00:00 2001
From: Hamish Friedlander <hamish@silverstripe.com>
Date: Wed, 29 Aug 2012 15:08:26 +1200
Subject: [PATCH] NEW Allow querying if a field exists on a table

---
 model/Database.php | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/model/Database.php b/model/Database.php
index d76f73853..7e32cd114 100644
--- a/model/Database.php
+++ b/model/Database.php
@@ -143,7 +143,7 @@ abstract class SS_Database {
 	 * Returns true if the given table exists in the database
 	 */
 	abstract function hasTable($tableName);
-	
+
 	/**
 	 * Returns the enum values available on the given field
 	 */
@@ -439,6 +439,18 @@ abstract class SS_Database {
 		}
 	}
 
+	/**
+	 * Return true if the table exists and already has a the field specified
+	 * @param string $tableName - The table to check
+	 * @param string $fieldName - The field to check
+	 * @return bool - True if the table exists and the field exists on the table
+	 */
+	function hasField($tableName, $fieldName) {
+		if (!$this->hasTable($tableName)) return false;
+		$fields = $this->fieldList($tableName);
+		return array_key_exists($fieldName, $fields);
+	}
+
 	/**
 	 * Generate the given field on the table, modifying whatever already exists as necessary.
 	 * @param string $table The table name.