From f75cf3a13d4c39d2e99051c0d26c4bda34070c19 Mon Sep 17 00:00:00 2001
From: toyomoyo <toyomoyo>
Date: Thu, 8 Nov 2007 01:59:49 +0000
Subject: [PATCH] MDL-11909, putting a unique constrait userid-itemid on
 grade_grades table

---
 lib/db/install.xml |  5 +++--
 lib/db/upgrade.php | 13 +++++++++++++
 version.php        |  2 +-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/lib/db/install.xml b/lib/db/install.xml
index ddb0d817db4..f2553a63a7c 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="lib/db" VERSION="20071010" COMMENT="XMLDB file for core Moodle tables"
+<XMLDB PATH="lib/db" VERSION="20071108" COMMENT="XMLDB file for core Moodle tables"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../lib/xmldb/xmldb.xsd"
 >
@@ -1301,7 +1301,8 @@
         <KEY NAME="itemid" TYPE="foreign" FIELDS="itemid" REFTABLE="grade_items" REFFIELDS="id" PREVIOUS="primary" NEXT="userid"/>
         <KEY NAME="userid" TYPE="foreign" FIELDS="userid" REFTABLE="user" REFFIELDS="id" PREVIOUS="itemid" NEXT="rawscaleid"/>
         <KEY NAME="rawscaleid" TYPE="foreign" FIELDS="rawscaleid" REFTABLE="scale" REFFIELDS="id" PREVIOUS="userid" NEXT="usermodified"/>
-        <KEY NAME="usermodified" TYPE="foreign" FIELDS="usermodified" REFTABLE="user" REFFIELDS="id" PREVIOUS="rawscaleid"/>
+        <KEY NAME="usermodified" TYPE="foreign" FIELDS="usermodified" REFTABLE="user" REFFIELDS="id" PREVIOUS="rawscaleid" NEXT="userid-itemid"/>
+        <KEY NAME="userid-itemid" TYPE="unique" FIELDS="userid, itemid" COMMENT="one entry per user per item" PREVIOUS="usermodified"/>
       </KEYS>
       <INDEXES>
         <INDEX NAME="locked-locktime" UNIQUE="false" FIELDS="locked, locktime" COMMENT="used in grading cron"/>
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index 2be32cdea51..a4ef23dd4d6 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -2585,6 +2585,19 @@ function xmldb_main_upgrade($oldversion=0) {
         }
     }    
 
+    if ($result && $oldversion < 2007101502) {
+
+    /// Define key userid-itemid (unique) to be added to grade_grades
+        $table = new XMLDBTable('grade_grades');
+        $key = new XMLDBKey('userid-itemid');
+        $key->setAttributes(XMLDB_KEY_UNIQUE, array('userid', 'itemid'));
+
+    /// Launch add key userid-itemid
+        $result = $result && add_key($table, $key);
+
+    /// Main savepoint reached
+        upgrade_main_savepoint($result, 2007101502);
+    }
 
     return $result;
 }
diff --git a/version.php b/version.php
index 9ca2a9c3fb3..786eb0d1043 100644
--- a/version.php
+++ b/version.php
@@ -6,7 +6,7 @@
 // This is compared against the values stored in the database to determine
 // whether upgrades should be performed (see lib/db/*.php)
 
-    $version = 2007101501;  // YYYYMMDD   = date of the 1.9 branch (don't change)
+    $version = 2007101502;  // YYYYMMDD   = date of the 1.9 branch (don't change)
                             //         X  = release number 1.9.[0,1,2,3...]
                             //          Y = micro-increments between releases