Mysql, fix active? method, it was forcing to reconnect when it should…

… not

lib/arjdbc/abstract/database_statements.rb

@@ -104,7 +104,7 @@ def convert_legacy_binds_to_attributes(binds)
         end
       end
 
-      def raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: false)
+      def raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: true)
         log(sql, name, async: async) do
           with_raw_connection(allow_retry: allow_retry, materialize_transactions: materialize_transactions) do |conn|
             conn.execute(sql)

lib/arjdbc/mysql/adapter.rb

@@ -199,7 +199,7 @@ def _quote(value)
       #++
 
       def active?
-        !(@raw_connection.nil? || @raw_connection.closed?)  && @lock.synchronize { @raw_connection&.execute_query("/* ping */ SELECT 1") } || false
+        !(@raw_connection.nil? || @raw_connection.closed?) && @lock.synchronize { @raw_connection&.ping } || false
       end
 
       alias :reset! :reconnect!

src/java/arjdbc/mysql/MySQLRubyJdbcConnection.java

@@ -119,6 +119,17 @@ protected DriverWrapper newDriverWrapper(final ThreadContext context, final Stri
         return driverWrapper;
     }
 
+    @JRubyMethod(name = "ping")
+    public RubyBoolean db_ping(final ThreadContext context) {
+        final Connection connection = getConnection(true);
+        if (connection == null) return context.fals;
+
+        // NOTE: It seems only `connection.isValid(aliveTimeout)` is needed
+        // for JDBC 4.0 and up. https://jira.mariadb.org/browse/CONJ-51
+
+        return context.runtime.newBoolean(isConnectionValid(context, connection));
+    }
+
     private static transient Class MYSQL_CONNECTION;
     private static transient Boolean MYSQL_CONNECTION_FOUND;