added mysql backend

backends/mysql/include/mysql_connection.hpp

@@ -0,0 +1,61 @@
+#ifndef QUERY_POSTGRES_CONNECTION_HPP
+#define QUERY_POSTGRES_CONNECTION_HPP
+
+#ifdef _MSC_VER
+#ifdef matador_mysql_EXPORTS
+#define MATADOR_MYSQL_API __declspec(dllexport)
+#else
+#define MATADOR_MYSQL_API __declspec(dllimport)
+#endif
+#pragma warning(disable: 4355)
+#else
+#define MATADOR_MYSQL_API
+#endif
+
+#include "matador/sql/connection_impl.hpp"
+
+#include <unordered_map>
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+namespace matador::backends::mysql {
+
+class mysql_connection : public matador::sql::connection_impl
+{
+public:
+  explicit mysql_connection(const sql::connection_info &info);
+  void open() override;
+  void close() override;
+  bool is_open() override;
+
+  std::unique_ptr<sql::query_result_impl> fetch(const std::string &stmt) override;
+  std::unique_ptr<sql::statement_impl> prepare(sql::query_context context) override;
+
+  size_t execute(const std::string &stmt) override;
+
+  sql::record describe(const std::string& table) override;
+
+  bool exists(const std::string &schema_name, const std::string &table_name) override;
+
+private:
+  mutable std::unique_ptr<MYSQL> mysql_;
+
+  using string_to_int_map = std::unordered_map<std::string, unsigned long>;
+
+  static string_to_int_map statement_name_map_;
+};
+
+}
+
+extern "C"
+{
+MATADOR_MYSQL_API matador::sql::connection_impl* create_database(const matador::sql::connection_info &info);
+
+MATADOR_MYSQL_API void destroy_database(matador::sql::connection_impl *db);
+}
+
+#endif //QUERY_POSTGRES_CONNECTION_HPP

backends/mysql/include/mysql_dialect.hpp

@@ -0,0 +1,19 @@
+#ifndef QUERY_POSTGRES_DIALECT_HPP
+#define QUERY_POSTGRES_DIALECT_HPP
+
+#ifdef _MSC_VER
+#ifdef matador_mysql_EXPORTS
+#define MATADOR_MYSQL_API __declspec(dllexport)
+#else
+#define MATADOR_MYSQL_API __declspec(dllimport)
+#endif
+#pragma warning(disable: 4355)
+#else
+#define MATADOR_MYSQL_API
+#endif
+
+#include "matador/sql/dialect.hpp"
+
+extern "C" [[maybe_unused]] MATADOR_MYSQL_API const matador::sql::dialect* get_dialect();
+
+#endif //QUERY_POSTGRES_DIALECT_HPP

backends/mysql/include/mysql_error.hpp

@@ -0,0 +1,20 @@
+#ifndef QUERY_POSTGRES_ERROR_HPP
+#define QUERY_POSTGRES_ERROR_HPP
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+#include <string>
+
+namespace matador::backends::mysql {
+
+void throw_mysql_error(const char *what, const std::string &source);
+void throw_mysql_error(MYSQL *db, const std::string &source);
+void throw_mysql_error(MYSQL_STMT *stmt, const std::string &source, const std::string &sql);
+
+}
+
+#endif //QUERY_POSTGRES_ERROR_HPP

backends/mysql/include/mysql_parameter_binder.hpp

@@ -0,0 +1,72 @@
+#ifndef QUERY_POSTGRES_PARAMETER_BINDER_H
+#define QUERY_POSTGRES_PARAMETER_BINDER_H
+
+#include "matador/sql/parameter_binder.hpp"
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+#include <vector>
+
+namespace matador::backends::mysql {
+
+struct mysql_result_info
+{
+  unsigned long length = 0;
+  my_bool is_null = false;
+  my_bool error = false;
+//  std::unique_ptr<char[]> buffer;
+  char *buffer = nullptr;
+  unsigned long buffer_length = 0;
+  bool is_allocated = false;
+
+  ~mysql_result_info()
+  {
+    if (is_allocated) {
+      delete [] buffer;
+    }
+  }
+};
+
+class mysql_parameter_binder final : public sql::parameter_binder
+{
+public:
+  explicit mysql_parameter_binder(size_t size);
+
+  void bind(size_t pos, char i) override;
+  void bind(size_t pos, short i) override;
+  void bind(size_t pos, int i) override;
+  void bind(size_t pos, long i) override;
+  void bind(size_t pos, long long int i) override;
+  void bind(size_t pos, unsigned char i) override;
+  void bind(size_t pos, unsigned short i) override;
+  void bind(size_t pos, unsigned int i) override;
+  void bind(size_t pos, unsigned long i) override;
+  void bind(size_t pos, unsigned long long int i) override;
+  void bind(size_t pos, bool b) override;
+  void bind(size_t pos, float d) override;
+  void bind(size_t pos, double d) override;
+  void bind(size_t pos, const char *string) override;
+  void bind(size_t pos, const char *string, size_t size) override;
+  void bind(size_t pos, const std::string &string) override;
+  void bind(size_t pos, const std::string &x, size_t size) override;
+
+  [[nodiscard]] std::vector<MYSQL_BIND>& bind_params();
+
+private:
+  struct is_null_t
+  {
+    my_bool is_null = false;
+  };
+
+  std::vector<MYSQL_BIND> bind_params_;
+  std::vector<is_null_t> is_null_vector;
+  std::vector<mysql_result_info> info_;
+};
+
+}
+
+#endif //QUERY_POSTGRES_PARAMETER_BINDER_H

backends/mysql/include/mysql_prepared_result_reader.hpp

@@ -0,0 +1,36 @@
+#ifndef QUERY_MYSQL_PREPARED_RESULT_READER_HPP
+#define QUERY_MYSQL_PREPARED_RESULT_READER_HPP
+
+#include "matador/sql/query_result_reader.hpp"
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+namespace matador::backends::mysql {
+
+class mysql_prepared_result_reader : public sql::query_result_reader
+{
+public:
+  explicit mysql_prepared_result_reader(MYSQL_STMT *stmt);
+  ~mysql_prepared_result_reader() override;
+
+  [[nodiscard]] size_t column_count() const override;
+  [[nodiscard]] const char *column(size_t index) const override;
+  bool fetch() override;
+
+private:
+  MYSQL_STMT *stmt_{};
+
+  MYSQL_ROW current_row_{};
+
+  size_t row_count_{};
+  size_t column_count_{};
+  int row_index_{-1};
+};
+
+}
+
+#endif //QUERY_MYSQL_PREPARED_RESULT_READER_HPP

backends/mysql/include/mysql_result_reader.hpp

@@ -0,0 +1,36 @@
+#ifndef QUERY_POSTGRES_RESULT_READER_HPP
+#define QUERY_POSTGRES_RESULT_READER_HPP
+
+#include "matador/sql/query_result_reader.hpp"
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+namespace matador::backends::mysql {
+
+class mysql_result_reader : public sql::query_result_reader
+{
+public:
+  explicit mysql_result_reader(MYSQL_RES *result, unsigned int column_count);
+  ~mysql_result_reader() override;
+
+  [[nodiscard]] size_t column_count() const override;
+  [[nodiscard]] const char *column(size_t index) const override;
+  bool fetch() override;
+
+private:
+  MYSQL_RES *result_{};
+
+  MYSQL_ROW current_row_{};
+
+  size_t row_count_{};
+  size_t column_count_{};
+  int row_index_{-1};
+};
+
+}
+
+#endif //QUERY_POSTGRES_RESULT_READER_HPP

backends/mysql/include/mysql_statement.hpp

@@ -0,0 +1,37 @@
+#ifndef QUERY_POSTGRES_STATEMENT_HPP
+#define QUERY_POSTGRES_STATEMENT_HPP
+
+#include "matador/sql/statement_impl.hpp"
+
+#include "mysql_parameter_binder.hpp"
+
+#ifdef _MSC_VER
+#include <mysql.h>
+#else
+#include <mysql/mysql.h>
+#endif
+
+namespace matador::backends::mysql {
+
+class mysql_statement final : public sql::statement_impl
+{
+public:
+  mysql_statement(MYSQL_STMT *stmt, const sql::query_context &query);
+
+  size_t execute() override;
+  std::unique_ptr<sql::query_result_impl> fetch() override;
+  void reset() override;
+protected:
+  sql::parameter_binder& binder() override;
+
+private:
+  MYSQL_STMT *stmt_{nullptr};
+
+  std::string name_;
+
+  mysql_parameter_binder binder_;
+};
+
+}
+
+#endif //QUERY_POSTGRES_STATEMENT_HPP