Check if the SQL is not a prepared statement

When the adapter is with prepared statement disabled and the binds array
is not empty the connection adapter will try to set the binds values and
will fail. Now we are checking if the adapter has the prepared statement
disabled.

Fixes #12023

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Fix inserts with prepared statements disabled.
+
+    Fixes #12023.
+
+    *Rafael Mendonça França*
+
 *   Setting a has_one association on a new record no longer causes an empty
     transaction.
 

activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb

@@ -377,7 +377,7 @@ module ActiveRecord
         def sql_for_insert(sql, pk, id_value, sequence_name, binds)
           [sql, binds]
         end
-  
+
         def last_inserted_id(result)
           row = result.rows.first
           row && row.first

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -97,6 +97,7 @@ module ActiveRecord
         @pool                = pool
         @schema_cache        = SchemaCache.new self
         @visitor             = nil
+        @prepared_statements = false
       end
 
       def valid_type?(type)
@@ -440,6 +441,10 @@ module ActiveRecord
         # override in derived class
         ActiveRecord::StatementInvalid.new(message, exception)
       end
+
+      def without_prepared_statement?(binds)
+        @prepared_statements || binds.empty?
+      end
     end
   end
 end

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -174,6 +174,7 @@ module ActiveRecord
         @quoted_column_names, @quoted_table_names = {}, {}
 
         if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
+          @prepared_statements = true
           @visitor = Arel::Visitors::MySQL.new self
         else
           @visitor = unprepared_visitor

activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb

@@ -229,7 +229,7 @@ module ActiveRecord
 
       alias exec_without_stmt exec_query
 
-      # Returns an ActiveRecord::Result instance. 
+      # Returns an ActiveRecord::Result instance.
       def select(sql, name = nil, binds = [])
         exec_query(sql, name)
       end

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -283,7 +283,7 @@ module ActiveRecord
         # always be empty, since the bind variables will have been already
         # substituted and removed from binds by BindVisitor, so this will
         # effectively disable prepared statement usage completely.
-        if binds.empty?
+        if without_prepared_statement?(binds)
           result_set, affected_rows = exec_without_stmt(sql, name)
         else
           result_set, affected_rows = exec_stmt(sql, name, binds)

activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb

@@ -135,8 +135,8 @@ module ActiveRecord
 
         def exec_query(sql, name = 'SQL', binds = [])
           log(sql, name, binds) do
-            result = binds.empty? ? exec_no_cache(sql, binds) :
-                                    exec_cache(sql, binds)
+            result = without_prepared_statement?(binds) ? exec_no_cache(sql, binds) :
+                                                          exec_cache(sql, binds)
 
             types = {}
             fields = result.fields

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -531,6 +531,7 @@ module ActiveRecord
         super(connection, logger)
 
         if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
+          @prepared_statements = true
           @visitor = Arel::Visitors::PostgreSQL.new self
         else
           @visitor = unprepared_visitor

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -113,6 +113,7 @@ module ActiveRecord
         @config = config
 
         if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
+          @prepared_statements = true
           @visitor = Arel::Visitors::SQLite.new self
         else
           @visitor = unprepared_visitor
@@ -293,8 +294,8 @@ module ActiveRecord
       def exec_query(sql, name = nil, binds = [])
         log(sql, name, binds) do
 
-          # Don't cache statements without bind values
-          if binds.empty?
+          # Don't cache statements if they are not prepared
+          if without_prepared_statement?(binds)
             stmt    = @connection.prepare(sql)
             cols    = stmt.columns
             records = stmt.to_a

activerecord/test/cases/base_test.rb

@@ -565,6 +565,14 @@ class BasicsTest < ActiveRecord::TestCase
     assert_equal [topic_2, topic_1].sort, [topic_1, topic_2]
   end
 
+  def test_create_without_prepared_statement
+    topic = Topic.connection.unprepared_statement do
+      Topic.create(:title => 'foo')
+    end
+
+    assert_equal topic, Topic.find(topic.id)
+  end
+
   def test_comparison_with_different_objects
     topic = Topic.create
     category = Category.create(:name => "comparison")