feat: SELECT FOR UPDATE support (#268)

Author: taka-oyama

compose.yaml

@@ -8,4 +8,4 @@ services:
     depends_on:
       - emulator
   emulator:
-    image: "gcr.io/cloud-spanner-emulator/emulator:1.5.28"
+    image: "gcr.io/cloud-spanner-emulator/emulator:1.5.30"

src/Query/Grammar.php

@@ -64,7 +64,7 @@ public function compileInsertGetId(Builder $query, $values, $sequence)
      */
     protected function compileLock(Builder $query, $value)
     {
-        return '';
+        return $value === true ? 'for update' : '';
     }
 
     /**

tests/Query/BuilderTest.php

@@ -994,15 +994,15 @@ public function test_lock(): void
         $conn = $this->getDefaultConnection();
         $qb = $conn->table(self::TABLE_NAME_USER);
         $sql = $qb->lock()->toRawSql();
-        $this->assertSame('select * from `User`', $sql);
+        $this->assertSame('select * from `User` for update', $sql);
     }
 
     public function test_lockForUpdate(): void
     {
         $conn = $this->getDefaultConnection();
         $qb = $conn->table(self::TABLE_NAME_USER);
         $sql = $qb->lockForUpdate()->toRawSql();
-        $this->assertSame('select * from `User`', $sql);
+        $this->assertSame('select * from `User` for update', $sql);
     }
 
     public function test_sharedLock(): void