From 64790d4d2e5608cdaede6eb6851894ebc45bc83f Mon Sep 17 00:00:00 2001
From: Arne Groskurth <arne.groskurth@gears9.de>
Date: Thu, 6 Dec 2018 22:08:03 +0100
Subject: [PATCH] Ensuring correct ALTER TABLE statement for creation of an
 AUTO INCREMENT column as new PRIMARY KEY

---
 lib/Doctrine/DBAL/Platforms/MySqlPlatform.php | 11 +++
 ...imaryKeyWithNewAutoIncrementColumnTest.php | 69 +++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 tests/Doctrine/Tests/DBAL/Functional/Platform/NewPrimaryKeyWithNewAutoIncrementColumnTest.php

diff --git a/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php b/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
index 744aa08a4bd..059535640e1 100644
--- a/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
@@ -599,6 +599,17 @@ public function getAlterTableSQL(TableDiff $diff)
             $keyColumns   = array_unique(array_values($diff->addedIndexes['primary']->getColumns()));
             $queryParts[] = 'ADD PRIMARY KEY (' . implode(', ', $keyColumns) . ')';
             unset($diff->addedIndexes['primary']);
+        } elseif (isset($diff->changedIndexes['primary'])) {
+            // Necessary in case the new primary key includes a new auto_increment column
+            foreach ($diff->changedIndexes['primary']->getColumns() as $columnName) {
+                if (isset($diff->addedColumns[$columnName]) && $diff->addedColumns[$columnName]->getAutoincrement()) {
+                    $keyColumns   = array_unique(array_values($diff->changedIndexes['primary']->getColumns()));
+                    $queryParts[] = 'DROP PRIMARY KEY';
+                    $queryParts[] = 'ADD PRIMARY KEY (' . implode(', ', $keyColumns) . ')';
+                    unset($diff->changedIndexes['primary']);
+                    break;
+                }
+            }
         }
 
         $sql      = [];
diff --git a/tests/Doctrine/Tests/DBAL/Functional/Platform/NewPrimaryKeyWithNewAutoIncrementColumnTest.php b/tests/Doctrine/Tests/DBAL/Functional/Platform/NewPrimaryKeyWithNewAutoIncrementColumnTest.php
new file mode 100644
index 00000000000..ec387638c40
--- /dev/null
+++ b/tests/Doctrine/Tests/DBAL/Functional/Platform/NewPrimaryKeyWithNewAutoIncrementColumnTest.php
@@ -0,0 +1,69 @@
+<?php
+
+namespace Doctrine\Tests\DBAL\Functional\Platform;
+
+use Doctrine\DBAL\Schema\Comparator;
+use Doctrine\Tests\DbalFunctionalTestCase;
+use function in_array;
+
+final class NewPrimaryKeyWithNewAutoIncrementColumnTest extends DbalFunctionalTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        if (in_array($this->getPlatform()->getName(), ['mysql'])) {
+            return;
+        }
+
+        $this->markTestSkipped('Restricted to MySQL.');
+    }
+
+    /**
+     * Ensures that the primary key is created within the same "alter table" statement that an auto-increment column
+     * is added to the table as part of the new primary key.
+     *
+     * Before the fix for this problem this resulted in a database error: (at least on mysql)
+     * SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto
+     * column and it must be defined as a key
+     */
+    public function testAlterPrimaryKeyToAutoIncrementColumn()
+    {
+        $schemaManager = $this->connection->getSchemaManager();
+        $schema        = $schemaManager->createSchema();
+
+        $table = $schema->createTable('dbal2807');
+        $table->addColumn('initial_id', 'integer');
+        $table->setPrimaryKey(['initial_id']);
+
+        $schemaManager->dropAndCreateTable($table);
+
+        $newSchema = clone $schema;
+        $newTable  = $newSchema->getTable($table->getName());
+        $newTable->addColumn('new_id', 'integer', ['autoincrement' => true]);
+        $newTable->dropPrimaryKey();
+        $newTable->setPrimaryKey(['new_id']);
+
+        $diff = (new Comparator())->compare($schema, $newSchema);
+
+        foreach ($diff->toSql($this->getPlatform()) as $sql) {
+            $this->connection->exec($sql);
+        }
+
+        $validationSchema = $schemaManager->createSchema();
+        $validationTable  = $validationSchema->getTable($table->getName());
+
+        $this->assertTrue($validationTable->hasColumn('new_id'));
+        $this->assertTrue($validationTable->getColumn('new_id')->getAutoincrement());
+        $this->assertTrue($validationTable->hasPrimaryKey());
+        $this->assertSame(['new_id'], $validationTable->getPrimaryKeyColumns());
+    }
+
+    private function getPlatform()
+    {
+        return $this->connection->getDatabasePlatform();
+    }
+}