make Connection#prepared_statements? readonly

spec/database_spec.cr

@@ -111,21 +111,17 @@ describe DB::Database do
       end
     end
 
-    it "is copied to connections and can be changed (false)" do
+    it "is copied to connections (false)" do
       with_dummy "dummy://localhost:1027?prepared_statements=false&initial_pool_size=1" do |db|
         connection = DummyDriver::DummyConnection.connections.first
         connection.prepared_statements?.should be_false
-        connection.prepared_statements = true
-        connection.prepared_statements?.should be_true
       end
     end
 
-    it "is copied to connections and can be changed (true)" do
+    it "is copied to connections (true)" do
       with_dummy "dummy://localhost:1027?prepared_statements=true&initial_pool_size=1" do |db|
         connection = DummyDriver::DummyConnection.connections.first
         connection.prepared_statements?.should be_true
-        connection.prepared_statements = false
-        connection.prepared_statements?.should be_false
       end
     end
 

spec/dummy_driver.cr

@@ -212,8 +212,8 @@ def with_dummy(uri : String = "dummy://host?checkout_timeout=0.5")
   end
 end
 
-def with_dummy_connection
+def with_dummy_connection(options = "")
-  with_dummy do |db|
+  with_dummy("dummy://host?checkout_timeout=0.5&#{options}") do |db|
     db.using_connection do |cnn|
       yield cnn.as(DummyDriver::DummyConnection)
     end

spec/statement_spec.cr

@@ -10,7 +10,7 @@ describe DB::Statement do
   end
 
   it "should build unprepared statements" do
-    with_dummy_connection do |cnn|
+    with_dummy_connection("prepared_statements=false") do |cnn|
       prepared = cnn.unprepared("the query")
       prepared.should be_a(DB::Statement)
       prepared.as(DummyDriver::DummyStatement).prepared?.should be_false
@@ -19,16 +19,14 @@ describe DB::Statement do
 
   describe "prepared_statements flag" do
     it "should build prepared statements if true" do
-      with_dummy_connection do |cnn|
+      with_dummy_connection("prepared_statements=true") do |cnn|
-        cnn.prepared_statements = true
         stmt = cnn.query("the query").statement
         stmt.as(DummyDriver::DummyStatement).prepared?.should be_true
       end
     end
 
     it "should build unprepared statements if false" do
-      with_dummy_connection do |cnn|
+      with_dummy_connection("prepared_statements=false") do |cnn|
-        cnn.prepared_statements = false
         stmt = cnn.query("the query").statement
         stmt.as(DummyDriver::DummyStatement).prepared?.should be_false
       end

src/db/connection.cr

@@ -25,7 +25,7 @@ module DB
     # :nodoc:
     getter database
     @statements_cache = StringKeyCache(Statement).new
-    property? prepared_statements : Bool
+    getter? prepared_statements : Bool
 
     def initialize(@database : Database)
       @prepared_statements = @database.prepared_statements?