1 files changed, 9 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 53510c62c2..1df9ac32c9 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -8,6 +8,8 @@ require "mysql2"
 
 module ActiveRecord
   module ConnectionHandling # :nodoc:
+    ER_BAD_DB_ERROR = 1049
+
     # Establishes a connection to the database that's used by all Active Record objects.
     def mysql2_connection(config)
       config = config.symbolize_keys
@@ -22,7 +24,7 @@ module ActiveRecord
       client = Mysql2::Client.new(config)
       ConnectionAdapters::Mysql2Adapter.new(client, logger, nil, config)
     rescue Mysql2::Error => error
-      if error.message.include?("Unknown database")
+      if error.error_number == ER_BAD_DB_ERROR
         raise ActiveRecord::NoDatabaseError
       else
         raise
@@ -42,6 +44,12 @@ module ActiveRecord
         configure_connection
       end
 
+      def self.database_exists?(config)
+        !!ActiveRecord::Base.mysql2_connection(config)
+      rescue ActiveRecord::NoDatabaseError
+        false
+      end
+
       def supports_json?
         !mariadb? && database_version >= "5.7.8"
       end