Fix missing inline attributes for mysql connector

Changed mysql usage tests to be linked into one executable.
This provokes multiple definition errors for non-inlined free
functions.

tests/mysql/usage/Json.cpp

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2019 - 2019, 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 <mysql.h>
+#include <iostream>
+
+// JSON support only in MYSQL 5.7.8 and later
+#if !USE_MARIADB && (LIBMYSQL_VERSION_ID < 50708)
+int Json(int, char*[])
+{
+  std::cerr << "Warning: not testing Json, because the MySQL version id is less than 50708" << std::endl;
+  return 0;
+}
+#else
+// JSON support only in MariaDB 10.2.7 and later
+#if USE_MARIADB && (MARIADB_VERSION_ID < 100207)
+int Json(int, char*[])
+{
+  std::cerr << "Warning: not testing Json, because the MariaDB version id is less than 100207" << std::endl;
+  return 0;
+}
+#else
+
+#include "TabJson.h"
+#include <sqlpp11/mysql/mysql.h>
+#include <sqlpp11/sqlpp11.h>
+
+namespace test
+{
+  SQLPP_ALIAS_PROVIDER(value)
+}
+
+namespace mysql = sqlpp::mysql;
+int Json(int, char*[])
+{
+  mysql::global_library_init();
+
+  auto config = std::make_shared<mysql::connection_config>();
+  config->user = "root";
+  config->database = "sqlpp_mysql";
+  config->debug = true;
+  try
+  {
+    mysql::connection db(config);
+  }
+  catch (const sqlpp::exception& e)
+  {
+    std::cerr << "For testing, you'll need to create a database sqlpp_mysql for user root (no password)" << std::endl;
+    std::cerr << e.what() << std::endl;
+    return 1;
+  }
+  try
+  {
+    mysql::connection db(config);
+    db.execute(R"(DROP TABLE IF EXISTS tab_json)");
+    db.execute(R"(CREATE TABLE tab_json (
+			  data JSON NOT NULL
+		  ))");
+
+    const auto tab = test::TabJson{};
+    db(insert_into(tab).set(tab.data = R"--({"key" : "value"})--"));
+
+    const auto query =
+        select(sqlpp::verbatim<sqlpp::text>(R"--(JSON_UNQUOTE(JSON_EXTRACT(data, "$.key")))--").as(test::value))
+            .from(tab)
+            .unconditionally();
+
+    auto result = db(query);
+    if (result.empty())
+      throw std::runtime_error{"selection result is empty"};
+
+    const std::string value = result.front().value;
+
+    if (value != "value")
+      throw std::runtime_error{std::string{"unexpected value: "} + value};
+  }
+  catch (const std::exception& e)
+  {
+    std::cerr << "Exception: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+#endif
+#endif