From 5564584799e1ae835a3affbc32287fa27d0daadf Mon Sep 17 00:00:00 2001
From: Roland Bock <rbock@eudoxos.de>
Date: Tue, 13 Aug 2024 07:04:36 +0200
Subject: [PATCH] Provide code sample for #587

---
 tests/mysql/usage/CMakeLists.txt           |  1 +
 tests/mysql/usage/OnDuplicateKeyUpdate.cpp | 90 ++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 tests/mysql/usage/OnDuplicateKeyUpdate.cpp

diff --git a/tests/mysql/usage/CMakeLists.txt b/tests/mysql/usage/CMakeLists.txt
index a154f43d..f1bbf74e 100644
--- a/tests/mysql/usage/CMakeLists.txt
+++ b/tests/mysql/usage/CMakeLists.txt
@@ -42,6 +42,7 @@ set(test_files
     Remove.cpp
     Connection.cpp
     ConnectionPool.cpp
+    OnDuplicateKeyUpdate.cpp
 )
 
 create_test_sourcelist(test_sources test_main.cpp ${test_files})
diff --git a/tests/mysql/usage/OnDuplicateKeyUpdate.cpp b/tests/mysql/usage/OnDuplicateKeyUpdate.cpp
new file mode 100644
index 00000000..2ba59819
--- /dev/null
+++ b/tests/mysql/usage/OnDuplicateKeyUpdate.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2013 - 2016, 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 "make_test_connection.h"
+#include "TabSample.h"
+#include <sqlpp11/mysql/mysql.h>
+#include <sqlpp11/sqlpp11.h>
+
+#include <cassert>
+#include <iostream>
+#include <vector>
+
+namespace
+{
+  struct on_duplicate_key_update
+  {
+    std::string _serialized;
+
+    template <typename Db, typename Assignment>
+    on_duplicate_key_update(Db& db, Assignment assignment)
+    {
+      typename Db::_serializer_context_t context(db);
+      _serialized = " ON DUPLICATE KEY UPDATE " + serialize(assignment, context).str();
+    }
+
+    template <typename Db, typename Assignment>
+    auto operator()(Db& db, Assignment assignment) -> on_duplicate_key_update&
+    {
+      typename Db::_serializer_context_t context(db);
+      _serialized += ", " + serialize(assignment, context).str();
+      return *this;
+    }
+
+    auto get() const -> sqlpp::verbatim_t<::sqlpp::no_value_t>
+    {
+      return ::sqlpp::verbatim(_serialized);
+    }
+  };
+}  // namespace
+
+namespace sql = sqlpp::mysql;
+int OnDuplicateKeyUpdate(int, char*[])
+{
+  sql::global_library_init();
+  try
+  {
+    auto db = sql::make_test_connection();
+    db.execute(R"(DROP TABLE IF EXISTS tab_sample)");
+    db.execute(R"(CREATE TABLE tab_sample (
+			alpha bigint(20) AUTO_INCREMENT,
+			beta varchar(255) DEFAULT NULL,
+			gamma bool DEFAULT NULL,
+			PRIMARY KEY (alpha)
+			))");
+
+    const auto tab = TabSample{};
+
+    // Create a MYSQL style custom "insert on duplicate update"
+    db(custom_query(sqlpp::insert_into(tab).set(tab.beta = "sample", tab.gamma = true),
+                    on_duplicate_key_update(db, tab.beta = "sample")(db, tab.gamma = false).get()));
+  }
+  catch (const std::exception& e)
+  {
+    std::cerr << "Exception: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}