Add tests for schema-qualified tables

include/sqlpp11/core/basic/enable_join.h

@@ -77,4 +77,10 @@ namespace sqlpp
       return ::sqlpp::cross_join(this->derived(), std::move(t));
     }
   };
+
+  template <typename T>
+  struct has_enabled_join : public std::is_base_of<enable_join<T>, T>
+  {
+  };
+
 }  // namespace sqlpp

include/sqlpp11/core/basic/schema.h

@@ -38,7 +38,12 @@ namespace sqlpp
   template <typename Context>
   auto to_sql_string(Context& context, const schema_t& t) -> std::string
   {
-    context << t._name;
-    return context;
+    return name_to_sql_string(context, t._name);
   }
+
+  auto schema(std::string name) -> schema_t
+  {
+    return schema_t{std::move(name)};
+  };
+
 }  // namespace sqlpp

include/sqlpp11/core/basic/schema_qualified_table.h

@@ -37,52 +37,57 @@
 
 namespace sqlpp
 {
-  template <typename Table>
+  template <typename TableSpec, typename NameTag>
+  struct schema_qualified_table_as_t
+   : public TableSpec::_table_columns<schema_qualified_table_as_t<TableSpec, NameTag>>, public enable_join<schema_qualified_table_as_t<TableSpec, NameTag>>
+  {
+    schema_qualified_table_as_t(schema_t schema) : _schema(std::move(schema))
+    {
+    }
+
+    schema_t _schema;
+  };
+
+  template<typename TableSpec, typename NameTag>
+    struct is_table<schema_qualified_table_as_t<TableSpec, NameTag>> : public std::true_type {};
+
+  template <typename TableSpec, typename NameTag>
+  struct name_tag_of<schema_qualified_table_as_t<TableSpec, NameTag>> {
+    using type = NameTag;
+  };
+
+  template<typename TableSpec, typename NameTag>
+    struct provided_tables_of<schema_qualified_table_as_t<TableSpec, NameTag>> 
+    {
+      using type = detail::type_vector<schema_qualified_table_as_t<TableSpec, NameTag>>;
+    };
+
+  template <typename Context, typename TableSpec, typename NameTag>
+  auto to_sql_string(Context& context, const schema_qualified_table_as_t<TableSpec, NameTag>& t) -> std::string
+  {
+    return to_sql_string(context, t._schema) + "." + name_to_sql_string(context, name_tag_of_t<TableSpec>::name) +
+           " AS " + name_to_sql_string(context, NameTag::name);
+  }
+
+  template <typename TableSpec>
   struct schema_qualified_table_t
   {
-    using _traits = make_traits<value_type_of_t<Table>>;
-
-    using _nodes = detail::type_vector<>;
-    using _required_ctes = detail::type_set<>;
-    using _provided_tables = detail::type_set<>;
-
-    schema_qualified_table_t(schema_t schema, Table table) : _schema(std::move(schema)), _table(table)
+    schema_qualified_table_t(schema_t schema) : _schema(std::move(schema))
     {
     }
 
     template <typename NameTagProvider>
-    typename Table::template _foreign_table_as_t<NameTagProvider, schema_qualified_table_t> as(
-        const NameTagProvider& /*unused*/) const
+    auto as(const NameTagProvider& /*unused*/) const->schema_qualified_table_as_t<TableSpec, name_tag_of_t<NameTagProvider>>
     {
-      return {*this};
+      return {_schema};
     }
 
     schema_t _schema;
-    Table _table;
   };
 
-  template<typename Table>
-    struct is_table<schema_qualified_table_t<Table>> : public std::true_type {};
-
-  template <typename Context, typename Table>
-  auto to_sql_string(Context& context, const schema_qualified_table_t<Table>& t) -> std::string
+  template <typename TableSpec>
+  auto schema_qualified_table(schema_t schema, table_t<TableSpec>) -> schema_qualified_table_t<TableSpec>
   {
-    to_sql_string(context, t._schema);
-    context << '.';
-    to_sql_string(context, t._table);
-    return context;
-  }
-
-  template <typename Table>
-  auto schema_qualified_table(schema_t schema, Table table) -> schema_qualified_table_t<Table>
-  {
-    static_assert(required_tables_of_t<Table>::size::value == 0,
-                  "schema qualified tables must not depend on other tables");
-    static_assert(required_ctes_of<Table>::size::value == 0,
-                  "schema qualified tables must not depend on common table expressions");
-    static_assert(is_raw_table<Table>::value,
-                  "table must be a raw table, i.e. not an alias or common table expression");
-
-    return {schema, table};
+    return {schema};
   }
 }  // namespace sqlpp

include/sqlpp11/core/basic/table.h

@@ -39,13 +39,7 @@ namespace sqlpp
   template <typename TableSpec>
   struct table_t : public TableSpec::_table_columns<table_t<TableSpec>>, public enable_join<table_t<TableSpec>>
   {
-    using _traits = make_traits<no_value_t>;
-
     using _required_insert_columns = typename TableSpec::_required_insert_columns;
-#warning: Need to inherit?
-    //using _column_tuple_t = std::tuple<column_t<Table, ColumnSpec>...>;
-    template <typename NameTagProvider, typename T>
-    using _foreign_table_as_t = table_as_t<NameTagProvider, T>;
 
     template <typename NameTagProvider>
     constexpr auto as(const NameTagProvider& /*unused*/) const -> table_as_t<TableSpec, name_tag_of_t<NameTagProvider>>

include/sqlpp11/core/basic/table_as.h

@@ -42,9 +42,6 @@ namespace sqlpp
     using _nodes = detail::type_vector<>;
 
     static_assert(required_tables_of_t<TableSpec>::empty(), "table aliases must not depend on external tables");
-
-#warning: need to inherit?
-    //using _column_tuple_t = std::tuple<column_t<NameTagProvider, ColumnSpec>...>;
   };
 
   template<typename TableSpec, typename NameTag>

include/sqlpp11/core/to_sql_string.h

@@ -266,7 +266,7 @@ namespace sqlpp
   }
 
   template <typename Context>
-  auto name_to_sql_string(Context& , const char* t) -> std::string
+  auto name_to_sql_string(Context& , const ::sqlpp::string_view& t) -> std::string
   {
 #warning: We used to have a version of SQLPP_ALIAS_PROVIDER that marked names as keywords
 #warning: IIUC, the standard SQL way of handling keywords as names is to put them in square brackets, MySQL uses backticks, though

tests/core/serialize/basic/CMakeLists.txt

@@ -30,4 +30,5 @@ function(create_test name)
 endfunction()
 
 create_test(join)
+create_test(schema_qualified_table)
 

tests/core/serialize/basic/schema_qualified_table.cpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2024, Roland Bock
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Sample.h"
+#include "../compare.h"
+#include <sqlpp11/sqlpp11.h>
+
+int main(int, char* [])
+{
+  // A schema-qualified table cannot be used without AS.
+  auto major = schema_qualified_table(sqlpp::schema("major"), test::TabFoo{});
+  using M = decltype(major);
+
+  static_assert(not sqlpp::is_table<M>::value, "");
+
+  // A schema-qualified table can be used as table with AS:
+  auto major_foo = major.as(sqlpp::alias::a);
+
+  SQLPP_COMPARE(major_foo, "major.tab_foo AS a");
+  SQLPP_COMPARE(major_foo.id, "a.id");
+
+  return 0;
+}

tests/core/types/basic/CMakeLists.txt

@@ -30,6 +30,7 @@ endfunction()
 
 test_compile(column)
 test_compile(join)
+test_compile(schema_qualified_table)
 test_compile(table)
 test_compile(table_as)
 

tests/core/types/basic/schema_qualified_table.cpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2024, Roland Bock
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Sample.h"
+#include "../compare.h"
+#include <sqlpp11/sqlpp11.h>
+
+int main(int, char* [])
+{
+  // A schema-qualified table cannot be used without AS.
+  auto major = schema_qualified_table(sqlpp::schema("major"), test::TabFoo{});
+  using M = decltype(major);
+
+  static_assert(not sqlpp::is_table<M>::value, "");
+
+  // A schema-qualified table can be used as table with AS:
+  auto major_foo = major.as(test::TabFoo{});
+  using MF = decltype(major_foo);
+
+  static_assert(sqlpp::is_table<MF>::value, "");
+  static_assert(sqlpp::has_enabled_join<MF>::value, "");
+  static_assert(std::is_same<sqlpp::provided_tables_of_t<MF>, sqlpp::detail::type_vector<MF>>::value, "");
+  static_assert(std::is_same<sqlpp::required_tables_of_t<MF>, sqlpp::detail::type_vector<>>::value, "");
+
+  // Columns of a schema-qualified table work just like columns of unqualified tables.
+  using MFI = decltype(major_foo.id);
+  static_assert(sqlpp::is_integral<MFI>::value, "");
+  static_assert(sqlpp::has_name_tag<MFI>::value, "");
+
+  static_assert(std::is_same<sqlpp::provided_tables_of_t<MFI>, sqlpp::detail::type_vector<>>::value, "");
+  static_assert(std::is_same<sqlpp::required_tables_of_t<MFI>, sqlpp::detail::type_vector<MF>>::value, "");
+
+  return 0;
+}