New tuple_to_sql_string

2024-11-16 04:47:18 +08:00 · 2024-08-17 21:11:52 +02:00 · 2024-08-17 21:11:52 +02:00 · 55324d1f71
commit 55324d1f71
parent cc49ba1524
22 changed files with 99 additions and 86 deletions
--- a/include/sqlpp11/core/clause/cte.h
+++ b/include/sqlpp11/core/clause/cte.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/result_row.h>
 #include <sqlpp11/core/clause/select_flags.h>
--- a/include/sqlpp11/core/clause/from.h
+++ b/include/sqlpp11/core/clause/from.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/no_data.h>
 #include <sqlpp11/core/query/policy_update.h>
--- a/include/sqlpp11/core/clause/group_by.h
+++ b/include/sqlpp11/core/clause/group_by.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/type_traits.h>
@ -153,7 +153,7 @@ namespace sqlpp
  template <typename Context, typename... Columns>
  auto to_sql_string(Context& context, const group_by_data_t<Columns...>& t) -> std::string
  {
-    return " GROUP BY " + interpret_tuple(t._columns, ',', context);
+    return " GROUP BY " + tuple_to_sql_string(context, t._columns, tuple_operand{", "});
  }

  template <typename... T>
--- a/include/sqlpp11/core/clause/having.h
+++ b/include/sqlpp11/core/clause/having.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/type_traits.h>
--- a/include/sqlpp11/core/clause/insert_value_list.h
+++ b/include/sqlpp11/core/clause/insert_value_list.h
@ -29,7 +29,7 @@
 #include <sqlpp11/core/operator/assign_expression.h>
 #include <sqlpp11/core/basic/column_fwd.h>
 #include <sqlpp11/core/clause/insert_value.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/no_data.h>
 #include <sqlpp11/core/query/policy_update.h>
@ -405,7 +405,7 @@ namespace sqlpp
  auto to_sql_string(Context& context, const column_list_data_t<Columns...>& t) -> std::string
  {
    auto result = std::string{" ("};
-    result += interpret_tuple(t._columns, ",", context);
+    result += tuple_to_sql_string(context, t._columns, ",");
    result += ")";
    bool first = true;
    for (const auto& row : t._insert_values)
@ -420,7 +420,7 @@ namespace sqlpp
        result += ',';
      }
      result += '(';
-      result += interpret_tuple(row, ",", context);
+      result += tuple_to_sql_string(context, row, ",");
      result += ')';
    }

@ -431,9 +431,9 @@ namespace sqlpp
  auto to_sql_string(Context& context, const insert_list_data_t<Assignments...>& t) -> std::string
  {
    auto result = std::string{" ("};
-    result += interpret_tuple(t._columns, ",", context);
+    result += tuple_to_sql_string(context, t._columns, tuple_operand{", "});
    result += ") VALUES(";
-    result += interpret_tuple(t._values, ",", context);
+    result += tuple_to_sql_string(context, t._values, tuple_operand{", "});
    result += ")";
    return result;
  }
--- a/include/sqlpp11/core/clause/order_by.h
+++ b/include/sqlpp11/core/clause/order_by.h
@ -27,7 +27,7 @@
 */

 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/type_traits.h>
@ -148,7 +148,7 @@ namespace sqlpp
  template <typename Context, typename... Expressions>
  auto to_sql_string(Context& context, const order_by_data_t<Expressions...>& t) -> std::string
  {
-    return " ORDER BY " + interpret_tuple(t._expressions, ',', context);
+    return " ORDER BY " + tuple_to_sql_string(context, t._expressions, tuple_operand{", "});
  }

  template <typename... T>
--- a/include/sqlpp11/core/clause/select_column_list.h
+++ b/include/sqlpp11/core/clause/select_column_list.h
@ -30,7 +30,7 @@
 #include <sqlpp11/core/operator/as_expression.h>
 #include <sqlpp11/core/query/dynamic.h>
 #include <sqlpp11/core/field_spec.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/query/result_row.h>
 #include <sqlpp11/core/clause/select_as.h>
@ -330,7 +330,7 @@ namespace sqlpp
  template <typename Context, typename... Columns>
  auto to_sql_string(Context& context, const std::tuple<Columns...>& t) -> std::string
  {
-    return interpret_tuple(t, ",", context);
+    return tuple_to_sql_string(context, t, tuple_operand{", "});
  }

  template <typename... T>
--- a/include/sqlpp11/core/clause/select_flag_list.h
+++ b/include/sqlpp11/core/clause/select_flag_list.h
@ -27,7 +27,7 @@
 */

 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/no_data.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/clause/select_flags.h>
@ -137,7 +137,7 @@ namespace sqlpp
  template <typename Context, typename... Flags>
  auto to_sql_string(Context& context, const select_flag_list_data_t<Flags...>& t) -> std::string
  {
-    return interpret_tuple(t._flags, "", context);
+    return tuple_to_sql_string(context, t._flags, tuple_operand{" "});
  }

  template <typename T>
--- a/include/sqlpp11/core/clause/select_flags.h
+++ b/include/sqlpp11/core/clause/select_flags.h
@ -28,7 +28,7 @@

 #include <sqlpp11/core/type_traits.h>
 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <tuple>

 namespace sqlpp
--- a/include/sqlpp11/core/clause/union.h
+++ b/include/sqlpp11/core/clause/union.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/result_row.h>
 #include <sqlpp11/core/query/statement_fwd.h>
--- a/include/sqlpp11/core/clause/union_flags.h
+++ b/include/sqlpp11/core/clause/union_flags.h
@ -28,7 +28,7 @@

 #include <sqlpp11/core/type_traits.h>
 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <tuple>

 namespace sqlpp
--- a/include/sqlpp11/core/clause/update_list.h
+++ b/include/sqlpp11/core/clause/update_list.h
@ -27,7 +27,7 @@
 */

 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/type_traits.h>

 namespace sqlpp
@ -167,6 +167,6 @@ namespace sqlpp
  template <typename Context, typename... Assignments>
  auto to_sql_string(Context& context, const update_list_data_t<Assignments...>& t) -> std::string
  {
-    return " SET " + interpret_tuple(t._assignments, ",", context);
+    return " SET " + tuple_to_sql_string(context, t._assignments, tuple_operand{", "});
  }
 }  // namespace sqlpp
--- a/include/sqlpp11/core/clause/using.h
+++ b/include/sqlpp11/core/clause/using.h
@ -27,7 +27,7 @@
 */

 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/type_traits.h>

@ -138,8 +138,6 @@ namespace sqlpp
  template <typename Context, typename... Tables>
  auto to_sql_string(Context& context, const using_data_t<Tables...>& t) -> std::string
  {
-    context << " USING ";
-    interpret_tuple(t._tables, ',', context);
-    return context;
+    return " USING " + tuple_to_sql_string(context, t._tables, tuple_operand{", "});
  }
 }  // namespace sqlpp
--- a/include/sqlpp11/core/clause/where.h
+++ b/include/sqlpp11/core/clause/where.h
@ -26,7 +26,7 @@
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/query/statement_fwd.h>
 #include <sqlpp11/core/type_traits.h>
--- a/include/sqlpp11/core/clause/with.h
+++ b/include/sqlpp11/core/clause/with.h
@ -28,7 +28,7 @@

 #include <sqlpp11/core/operator/assign_expression.h>
 #include <sqlpp11/core/basic/column_fwd.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/logic.h>
 #include <sqlpp11/core/no_data.h>
 #include <sqlpp11/core/query/policy_update.h>
@ -132,7 +132,7 @@ namespace sqlpp
    {
      context << "RECURSIVE ";
    }
-    interpret_tuple(t._expressions, ',', context);
+    tuple_to_sql_string(context, t._expressions, tuple_operand{", "});
    context << ' ';
    return context;
  }
--- a/include/sqlpp11/core/database/parameter_list.h
+++ b/include/sqlpp11/core/database/parameter_list.h
@ -59,7 +59,7 @@ namespace sqlpp
    template <typename Target, size_t... Is>
    void _bind_impl(Target& target, const ::sqlpp::index_sequence<Is...>& /*unused*/) const
    {
-      using swallow = int[];  // see core/interpret_tuple.h
+      using swallow = int[];  // see coretuple_to_sql_string.h
      (void)swallow{0, (std::tuple_element<Is, _member_tuple_t>::type::operator()()._bind(target, Is), 0)...};
    }
  };
--- a/include/sqlpp11/core/operator/in_expression.h
+++ b/include/sqlpp11/core/operator/in_expression.h
@ -32,7 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <sqlpp11/core/operator/enable_as.h>
 #include <sqlpp11/core/type_traits.h>
 #include <sqlpp11/core/logic.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>

 namespace sqlpp
 {
@ -127,8 +127,7 @@ namespace sqlpp
    }
    else
    {
-#warning: interpret_tuple arguments should take Context first, too
-      result += interpret_tuple(t._r, ", ", context);
+      result += tuple_to_sql_string(context, t._r, tuple_operand{", "});
    }
    result += ")";
    return result;
--- a/include/sqlpp11/core/query/custom_query.h
+++ b/include/sqlpp11/core/query/custom_query.h
@ -29,7 +29,7 @@
 #include <sqlpp11/core/database/connection.h>
 #include <sqlpp11/core/detail/get_first.h>
 #include <sqlpp11/core/hidden.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/query/statement.h>

 namespace sqlpp
@ -125,7 +125,7 @@ namespace sqlpp
  template <typename Context, typename... Parts>
  auto to_sql_string(Context& context, const custom_query_t<Parts...>& t) -> std::string
  {
-    return interpret_tuple_without_braces(t._parts, " ", context);
+    return tuple_to_sql_string(context, t._parts, tuple_clause{" "});
  }

  template <typename... Parts>
--- a/include/sqlpp11/core/tuple_to_sql_string.h
+++ b/include/sqlpp11/core/tuple_to_sql_string.h
@ -1,7 +1,7 @@
 #pragma once

 /*
- * Copyright (c) 2013-2015, Roland Bock
+ * Copyright (c) 2024, Roland Bock
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
@ -33,53 +33,80 @@

 namespace sqlpp
 {
-  template <typename Element, typename Separator, typename Context, typename UseBraces>
-  static auto interpret_tuple_element(
-      const Element& element, const Separator& separator, Context& context, const UseBraces& /*unused*/, size_t index) -> std::string
+  struct tuple_operand
  {
-    const auto prefix = index ? std::string{separator} : std::string{};
-    if (UseBraces::value)
+    template <typename Context, typename T>
+    auto operator()(Context& context, const T& t, size_t index) const -> std::string
    {
-      return prefix + operand_to_sql_string(context, element);
+      const auto prefix = index ? std::string{separator} : std::string{};
+      return prefix + operand_to_sql_string(context, t);
    }
-    else
-    {
-      return prefix + to_sql_string(context, element);
-    }
-  }

-  template <typename Tuple, typename Separator, typename Context, typename UseBraces, size_t... Is>
-  auto interpret_tuple_impl(const Tuple& t,
-                            const Separator& separator,
-                            Context& context,
-                            const UseBraces& useBraces,
-                            const ::sqlpp::index_sequence<Is...> &
-                            /*unused*/) -> std::string
+    sqlpp::string_view separator;
+  };
+
+#warning: to be used by group_by and update
+  struct tuple_operand_no_dynamic
+  {
+    template <typename Context, typename T>
+    auto operator()(Context& context, const T& t, size_t ) const -> std::string
+    {
+      const auto prefix = need_prefix ? std::string{separator} : std::string{};
+      need_prefix = true;
+      return prefix + operand_to_sql_string(context, t);
+    }
+
+    template <typename Context, typename T>
+    auto operator()(Context& context, const sqlpp::dynamic_t<T>& t, size_t index) const -> std::string
+    {
+      if (t._condition)
+      {
+        return operator()(context, t._expr, index);
+      }
+      return "";
+    }
+
+    sqlpp::string_view separator;
+    bool need_prefix = false;
+  };
+
+  struct tuple_clause
+  {
+    template <typename Context, typename T>
+    auto operator()(Context& context, const T& t, size_t index) const -> std::string
+    {
+      const auto prefix = index ? std::string{separator} : std::string{};
+      return prefix + to_sql_string(context, t);
+    }
+
+    sqlpp::string_view separator;
+  };
+
+  template <typename Context, typename Tuple, typename Strategy, size_t... Is>
+  auto tuple_to_sql_string_impl(Context& context,
+                                const Tuple& t,
+                                const Strategy& strategy,
+                                const ::sqlpp::index_sequence<Is...>&
+                                /*unused*/) -> std::string
  {
    // Note: A braced-init-list does guarantee the order of evaluation according to 12.6.1 [class.explicit.init]
    // paragraph 2 and 8.5.4 [dcl.init.list] paragraph 4.
    // See for example: "http://en.cppreference.com/w/cpp/utility/integer_sequence"
    // See also: "http://stackoverflow.com/questions/6245735/pretty-print-stdtuple/6245777#6245777"
    // Beware of gcc-bug: "http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51253", otherwise an empty swallow struct could
-    // be used
+    // be used.
    auto result = std::string{};
    using swallow = int[];
    (void)swallow{0,  // workaround against -Wpedantic GCC warning "zero-size array 'int [0]'"
-                  (result += interpret_tuple_element(std::get<Is>(t), separator, context, useBraces, Is), 0)...};
+                  (result += strategy(context, std::get<Is>(t), Is), 0)...};
    return result;
  }

-  template <typename Tuple, typename Separator, typename Context>
-  auto interpret_tuple(const Tuple& t, const Separator& separator, Context& context) -> std::string
+  template <typename Context, typename Tuple, typename Strategy>
+  auto tuple_to_sql_string(Context& context, const Tuple& t, const Strategy& strategy) -> std::string
  {
-    return interpret_tuple_impl(t, separator, context, std::true_type{},
+    return tuple_to_sql_string_impl(context, t, strategy,
                                ::sqlpp::make_index_sequence<std::tuple_size<Tuple>::value>{});
  }

-  template <typename Tuple, typename Separator, typename Context>
-  auto interpret_tuple_without_braces(const Tuple& t, const Separator& separator, Context& context) -> std::string
-  {
-    return interpret_tuple_impl(t, separator, context, std::false_type{},
-                                ::sqlpp::make_index_sequence<std::tuple_size<Tuple>::value>{});
-  }
 }  // namespace sqlpp
--- a/include/sqlpp11/mysql/serializer.h
+++ b/include/sqlpp11/mysql/serializer.h
@ -32,17 +32,13 @@
 namespace sqlpp
 {
  template <typename First, typename... Args>
-  mysql::context_t& to_sql_string(const concat_t<First, Args...>& t, mysql::context_t& ctx)
+  auto to_sql_string(mysql::context_t& ctx, const concat_t<First, Args...>& t, mysql::context_t& ctx) -> std::string
  {
-    ctx << "CONCAT(";
-    interpret_tuple(t._args, ',', ctx);
-    ctx << ')';
-    return ctx;
+    return "CONCAT(" + tuple_to_sql_string(context, t._args, tuple_operand(", ")) + ")";
  }

-  inline mysql::context_t& to_sql_string(const insert_default_values_data_t&, mysql::context_t& ctx)
+  inline auto to_sql_string(mysql::context_t&, const insert_default_values_data_t&) -> std::string
  {
-    ctx << " () VALUES()";
-    return ctx;
+    return " () VALUES()";
  }
 }
--- a/include/sqlpp11/postgresql/on_conflict_do_update.h
+++ b/include/sqlpp11/postgresql/on_conflict_do_update.h
@ -28,7 +28,7 @@
 */

 #include <sqlpp11/core/detail/type_set.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/type_traits.h>
 #include <sqlpp11/core/clause/where.h>

@ -139,14 +139,10 @@ namespace sqlpp
    };

    template <typename ConflictTarget, typename... Assignments>
-    postgresql::context_t& to_sql_string(
-        const postgresql::on_conflict_do_update_data_t<ConflictTarget, Assignments...>& o,
-        postgresql::context_t& context)
+    auto to_sql_string(postgresql::context_t& context,
+        const postgresql::on_conflict_do_update_data_t<ConflictTarget, Assignments...>& o) -> std::string
    {
-      to_sql_string(context, o._conflict_target);
-      context << "DO UPDATE SET ";
-      interpret_tuple(o._assignments, ",", context);
-      return context;
+      return to_sql_string(context, o._conflict_target) + "DO UPDATE SET " + tuple_to_sql_string(context, o._assignments, tuple_operand{", "});
    }

    template <typename ConflictTarget, typename Expression, typename... Assignments>
--- a/include/sqlpp11/postgresql/returning_column_list.h
+++ b/include/sqlpp11/postgresql/returning_column_list.h
@ -32,7 +32,7 @@
 #include <sqlpp11/core/detail/type_set.h>
 #include <sqlpp11/expression_fwd.h>
 #include <sqlpp11/core/field_spec.h>
-#include <sqlpp11/core/interpret_tuple.h>
+#include <sqlpp11/core/tuple_to_sql_string.h>
 #include <sqlpp11/core/query/policy_update.h>
 #include <sqlpp11/core/query/result_row.h>
 #include <sqlpp11/select_pseudo_table.h>
@ -293,12 +293,9 @@ namespace sqlpp

    // Serialization
    template <typename... Columns>
-    postgresql::context_t& to_sql_string(const postgresql::returning_column_list_data_t<Columns...>& t,
-                                     postgresql::context_t& context)
+    auto to_sql_string(postgresql::context_t& context, const postgresql::returning_column_list_data_t<Columns...>& t) -> std::string
    {
-      context << " RETURNING ";
-      interpret_tuple(t._columns, ',', context);
-      return context;
+      return " RETURNING " +  tuple_to_sql_string(context, t._columns, tuple_operand{", "});
    }
  }
 }  // namespace sqlpp