diff --git a/include/cpphibernate/driver/mariadb/schema/attributes.h b/include/cpphibernate/driver/mariadb/schema/attributes.h
index 16db25b..a4e072c 100644
--- a/include/cpphibernate/driver/mariadb/schema/attributes.h
+++ b/include/cpphibernate/driver/mariadb/schema/attributes.h
@@ -9,7 +9,7 @@
 
 beg_namespace_cpphibernate_driver_mariadb
 {
-    
+
     /* attributes_t */
 
     struct attributes_t :
diff --git a/include/cpphibernate/driver/mariadb/schema/field.h b/include/cpphibernate/driver/mariadb/schema/field.h
index 3f852d7..0274f1d 100644
--- a/include/cpphibernate/driver/mariadb/schema/field.h
+++ b/include/cpphibernate/driver/mariadb/schema/field.h
@@ -2,6 +2,9 @@
 
 #include <cpphibernate/misc.h>
 #include <cpphibernate/config.h>
+#include <cpphibernate/schema/field.h>
+#include <cpphibernate/schema/table.h>
+#include <cpphibernate/schema/schema.h>
 #include <cpphibernate/driver/mariadb/schema/field.fwd.h>
 #include <cpphibernate/driver/mariadb/schema/table.fwd.h>
 #include <cpphibernate/driver/mariadb/schema/attributes.h>
@@ -40,6 +43,8 @@ beg_namespace_cpphibernate_driver_mariadb
             , referenced_table  (nullptr)
             { }
         virtual ~field_t() = default;
+
+        void print(std::ostream& os) const;
     };
 
     /* simple_field_t */
diff --git a/include/cpphibernate/driver/mariadb/schema/table.h b/include/cpphibernate/driver/mariadb/schema/table.h
index d39953c..c758d9a 100644
--- a/include/cpphibernate/driver/mariadb/schema/table.h
+++ b/include/cpphibernate/driver/mariadb/schema/table.h
@@ -57,6 +57,8 @@ beg_namespace_cpphibernate_driver_mariadb
             , data_fields               ()
             { }
         virtual ~table_t() = default;
+
+        void print(std::ostream& os) const;
     };
 
     /* table_simple_t */
diff --git a/include/cpphibernate/misc.h b/include/cpphibernate/misc.h
index ae02dec..c556322 100644
--- a/include/cpphibernate/misc.h
+++ b/include/cpphibernate/misc.h
@@ -2,4 +2,5 @@
 
 #include <cpphibernate/misc/general.h>
 #include <cpphibernate/misc/meta.h>
+#include <cpphibernate/misc/print.h>
 #include <cpphibernate/misc/wrap.h>
\ No newline at end of file
diff --git a/include/cpphibernate/misc/meta.h b/include/cpphibernate/misc/meta.h
index 9ea58da..2821f37 100644
--- a/include/cpphibernate/misc/meta.h
+++ b/include/cpphibernate/misc/meta.h
@@ -6,6 +6,7 @@
 
 #include <cpphibernate/config.h>
 
+#include <cpputils/misc/exception.h>
 #include <cpputils/container/nullable.h>
 
 beg_namespace_cpphibernate_misc
@@ -118,5 +119,13 @@ beg_namespace_cpphibernate_misc
     template<typename T>
     using real_dataset_t = typename __impl::real_dataset_impl<T>::type;
 
+    /* hibernate_exception */
+
+    struct hibernate_exception
+        : public utl::exception
+    {
+        using utl::exception::exception;
+    };
+
 }
 end_namespace_cpphibernate_misc
\ No newline at end of file
diff --git a/include/cpphibernate/misc/print.h b/include/cpphibernate/misc/print.h
new file mode 100644
index 0000000..dcf7c06
--- /dev/null
+++ b/include/cpphibernate/misc/print.h
@@ -0,0 +1,112 @@
+#pragma once
+
+#include <list>
+#include <vector>
+#include <memory>
+#include <iostream>
+
+#include <cpphibernate/config.h>
+#include <cpputils/misc/indent.h>
+
+namespace std
+{
+
+    template<typename T_char, typename T_traits, typename X>
+    inline auto operator <<(basic_ostream<T_char, T_traits>& os, X&& x)
+        -> ::utl::mp::enable_if<
+                utl::mp::is_valid<decltype(std::forward<X>(x).print(os))>,
+                basic_ostream<T_char, T_traits>&>
+    {
+        std::forward<X>(x).print(os);
+        return os;
+    }
+
+}
+
+beg_namespace_cpphibernate_misc
+{
+
+    template<typename T_container, typename T_func>
+    struct container_printer
+    {
+        T_container container;
+        bool        do_indent;
+        T_func      func;
+
+        inline void print(std::ostream& os) const
+        {
+            using namespace ::utl;
+            auto beg = std::begin(container);
+            auto end = std::end  (container);
+            if (beg != end)
+            {
+                if (do_indent)
+                {
+                    os  << indent << "["
+                        << incindent;
+                }
+                else
+                {
+                    os << "[";
+                }
+
+                size_t index = 0;
+                for (auto it = beg; it != end; ++it)
+                {
+                    if (index++)
+                        os << ",";
+                    if (!do_indent)
+                        os << " ";
+                    func(os, *it);
+                }
+
+                if (do_indent)
+                {
+                    os  << decindent
+                        << indent << "]";
+                }
+                else
+                {
+                    os << " ]";
+                }
+            }
+            else
+            {
+                os << "[ ]";
+            }
+        }
+    };
+
+    struct print_container_builder
+    {
+        template<typename T_container, typename T_func>
+        constexpr decltype(auto) operator()(T_container&& container, bool do_indent, T_func&& func) const
+        {
+            return container_printer<T_container, T_func>
+            {
+                std::forward<T_container>(container),
+                do_indent,
+                std::forward<T_func>(func)
+            };
+        }
+
+        template<typename T_container>
+        constexpr decltype(auto) operator()(T_container&& container, bool do_indent) const
+        {
+            return this->operator()(
+                std::forward<T_container>(container),
+                do_indent,
+                [do_indent](auto& os, auto& value)
+                {
+                    using namespace ::utl;
+                    if (do_indent)
+                        os << indent;
+                    os << utl::to_string(value);
+                });
+        }
+    };
+
+    constexpr decltype(auto) print_container = print_container_builder { };
+
+}
+end_namespace_cpphibernate_misc
\ No newline at end of file
diff --git a/include/cpphibernate/schema.h b/include/cpphibernate/schema.h
index 19d699c..cebb0f4 100644
--- a/include/cpphibernate/schema.h
+++ b/include/cpphibernate/schema.h
@@ -6,7 +6,6 @@
 #include <cpphibernate/schema/fields.h>
 #include <cpphibernate/schema/getter.h>
 #include <cpphibernate/schema/macros.h>
-#include <cpphibernate/schema/print.h>
 #include <cpphibernate/schema/schema.h>
 #include <cpphibernate/schema/setter.h>
 #include <cpphibernate/schema/table.h>
diff --git a/include/cpphibernate/schema/macros.h b/include/cpphibernate/schema/macros.h
index b4e514c..bd778f9 100644
--- a/include/cpphibernate/schema/macros.h
+++ b/include/cpphibernate/schema/macros.h
@@ -38,6 +38,6 @@
 
 #define cpphibernate_make_id(p_member_ptr)                              \
     cpphibernate_make_field_name(                                       \
-        "p_id",                                                         \
+        id,                                                             \
         p_member_ptr,                                                   \
         cpphibernate::schema::attribute::primary_key)
\ No newline at end of file
diff --git a/include/cpphibernate/schema/print.h b/include/cpphibernate/schema/print.h
deleted file mode 100644
index 322ab42..0000000
--- a/include/cpphibernate/schema/print.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#pragma once
-
-#include <iostream>
-#include <cpphibernate/config.h>
-
-namespace std
-{
-
-    template<typename T_char, typename T_traits, typename X>
-    inline auto operator <<(basic_ostream<T_char, T_traits>& os, X&& x)
-        -> ::utl::mp::enable_if<
-                utl::mp::is_valid<decltype(std::forward<X>(x).print(os))>,
-                basic_ostream<T_char, T_traits>&>
-    {
-        std::forward<X>(x).print(os);
-        return os;
-    }
-
-}
\ No newline at end of file
diff --git a/src/driver/mariadb/schema/field.cpp b/src/driver/mariadb/schema/field.cpp
new file mode 100644
index 0000000..3c27579
--- /dev/null
+++ b/src/driver/mariadb/schema/field.cpp
@@ -0,0 +1,31 @@
+#include <string>
+#include <iostream>
+
+#include <cpputils/misc/enum.h>
+#include <cpputils/misc/string.h>
+#include <cpputils/misc/indent.h>
+
+#include <cpphibernate/misc.h>
+#include <cpphibernate/driver/mariadb/schema/field.h>
+#include <cpphibernate/driver/mariadb/schema/table.h>
+
+using namespace ::utl;
+using namespace ::cpphibernate::driver::mariadb_impl;
+
+void field_t::print(std::ostream& os) const
+{
+    os  << indent << '{'
+        << incindent
+            << indent << "\"table_dataset_id\": "   <<  table_dataset_id << ","
+            << indent << "\"value_dataset_id\": "   <<  value_dataset_id << ","
+            << indent << "\"value_is_nullable\": "  <<  (value_is_nullable ? "true" : "false") << ","
+            << indent << "\"value_is_container\": " <<  (value_is_container ? "true" : "false") << ","
+            << indent << "\"schema_name\": \""      <<  schema_name << "\","
+            << indent << "\"table_name\": \""       <<  table_name << "\","
+            << indent << "\"field_name\": \""       <<  field_name << "\","
+            << indent << "\"attributes\": "         <<  misc::print_container(attributes, false) << ","
+            << indent << "\"table\": "              << (table ? std::string("\"") + table->table_name + "\"" : "null") << ","
+            << indent << "\"referenced_table\": "   << (referenced_table ? std::string("\"") + referenced_table->table_name + "\"" : "null")
+        << decindent
+        << indent << '}';
+}
\ No newline at end of file
diff --git a/src/driver/mariadb/schema/schema.cpp b/src/driver/mariadb/schema/schema.cpp
index 372e5d2..f790180 100644
--- a/src/driver/mariadb/schema/schema.cpp
+++ b/src/driver/mariadb/schema/schema.cpp
@@ -1,15 +1,112 @@
 #include <string>
 #include <iostream>
+
+#include <cpputils/misc/enum.h>
+#include <cpputils/misc/string.h>
+#include <cpputils/misc/indent.h>
+
+#include <cpphibernate/misc.h>
 #include <cpphibernate/driver/mariadb/schema/schema.h>
 
+using namespace ::utl;
 using namespace ::cpphibernate::driver::mariadb_impl;
 
 void schema_t::update()
 {
+// clear everything
+    for (auto& kvp : tables)
+    {
+        assert(static_cast<bool>(kvp.second));
+        auto& table = *kvp.second;
+        table.primary_key_field = nullptr;
+        table.derived_tables.clear();
+        table.foreign_key_fields.clear();
+        table.foreign_table_fields.clear();
+        table.foreign_table_one_fields.clear();
+        table.foreign_table_many_fields.clear();
+        table.data_fields.clear();
+    }
+
+    // update references
+    for (auto& kvp : tables)
+    {
+        assert(static_cast<bool>(kvp.second));
+        auto& table = *kvp.second;
+
+        // base table
+        auto it = tables.find(table.base_dataset_id);
+        table.base_table = (it != tables.end()
+            ? it->second.get()
+            : nullptr);
+
+        // derived tables
+        for (auto& id : table.derived_dataset_ids)
+        {
+            it = tables.find(id);
+            if (it == tables.end())
+                throw misc::hibernate_exception(std::string("unable to find derived table for dataset id ") + std::to_string(id));
+            table.derived_tables.emplace_back(it->second.get());
+        }
+
+        // update fields
+        for (auto& ptr : table.fields)
+        {
+            auto& field = *ptr;
+
+            // table
+            if (table.dataset_id != field.table_dataset_id)
+                throw misc::hibernate_exception(std::string("dataset id of field '") + field.table_name + '.' + field.field_name + "' does not match!");
+            field.table = &table;
+
+            // referenced table
+            it = tables.find(field.value_dataset_id);
+            auto referenced_table = (it != tables.end()
+                ? it->second.get()
+                : nullptr);
+            field.referenced_table = referenced_table;
+
+            // is primary key field
+            if (field.attributes.count(attribute_t::primary_key))
+            {
+                if (static_cast<bool>(table.primary_key_field))
+                    throw misc::hibernate_exception(std::string("Table '") + table.table_name + "' can not have more then one primary key!");
+                table.primary_key_field = &field;
+            }
+
+            // is foreign table field
+            else if (static_cast<bool>(referenced_table))
+            {
+                table.foreign_table_fields.emplace_back(&field);
+                if (field.value_is_container)
+                {
+                    table.foreign_table_many_fields.emplace_back(&field);
+                    referenced_table->foreign_key_fields.push_back(&field);
+                }
+                else
+                {
+                    table.foreign_table_one_fields.emplace_back(&field);
+                }
+            }
 
+            // is data field
+            else
+            {
+                table.data_fields.emplace_back(&field);
+            }
+        }
+        if (!static_cast<bool>(table.primary_key_field))
+            throw misc::hibernate_exception(std::string("Table '") + table.table_name + "' does not have a primary key!");
+    }
 }
 
 void schema_t::print(std::ostream& os) const
 {
-    os << "fuu" << std::endl;
+    os  << indent << '{'
+        << incindent
+            << indent << "\"schema_name\": \""  <<  schema_name << "\","
+            << indent << "\"tables\": "         <<  misc::print_container(tables, true, [](auto& os, auto& kvp) {
+                                                        kvp.second->print(os);
+                                                    })
+        << decindent
+        << indent << '}';
 }
\ No newline at end of file
diff --git a/src/driver/mariadb/schema/table.cpp b/src/driver/mariadb/schema/table.cpp
new file mode 100644
index 0000000..30eca9f
--- /dev/null
+++ b/src/driver/mariadb/schema/table.cpp
@@ -0,0 +1,49 @@
+#include <string>
+#include <iostream>
+
+#include <cpputils/misc/enum.h>
+#include <cpputils/misc/string.h>
+#include <cpputils/misc/indent.h>
+
+#include <cpphibernate/misc.h>
+#include <cpphibernate/driver/mariadb/schema/table.h>
+
+using namespace ::utl;
+using namespace ::cpphibernate::driver::mariadb_impl;
+
+void table_t::print(std::ostream& os) const
+{
+    os  << indent << '{'
+        << incindent
+            << indent << "\"dataset_id\": "                 <<  dataset_id << ","
+            << indent << "\"base_dataset_id\": "            <<  base_dataset_id << ","
+            << indent << "\"table_id\": "                   <<  table_id << ","
+            << indent << "\"derived_dataset_ids\": "        <<  misc::print_container(derived_dataset_ids, false) << ","
+            << indent << "\"schema_name\": \""              <<  schema_name << "\","
+            << indent << "\"table_name\": \""               <<  table_name << "\","
+            << indent << "\"fields\":"                      <<  misc::print_container(fields, true, [](auto& os, auto& field) {
+                                                                    field->print(os);
+                                                                }) << ","
+            << indent << "\"base_table\": "                 <<  (base_table ? std::string("\"") + base_table->table_name + "\"" : "null") << ","
+            << indent << "\"derived_tables\":"              <<  misc::print_container(derived_tables, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->table_name << '"';
+                                                                }) << ","
+            << indent << "\"primary_key_field\": "          <<  (primary_key_field ? std::string("\"") + primary_key_field->field_name + "\"" : "null") << ","
+            << indent << "\"foreign_key_fields\": "         <<  misc::print_container(foreign_key_fields, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->table_name << '.' << ptr->field_name << '"';
+                                                                }) << ","
+            << indent << "\"foreign_table_fields\": "       <<  misc::print_container(foreign_table_fields, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->field_name << '"';
+                                                                }) << ","
+            << indent << "\"foreign_table_one_fields\": "   <<  misc::print_container(foreign_table_one_fields, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->field_name << '"';
+                                                                }) << ","
+            << indent << "\"foreign_table_many_fields\": "  <<  misc::print_container(foreign_table_many_fields, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->field_name << '"';
+                                                                }) << ","
+            << indent << "\"data_fields\": "                <<  misc::print_container(data_fields, true, [](auto& os, auto& ptr){
+                                                                    os << indent << '"' << ptr->field_name << '"';
+                                                                })
+        << decindent
+        << indent << '}';
+}
\ No newline at end of file