first thoughts about database

database/mysql/CMakeLists.txt

@@ -0,0 +1,13 @@
+set(HEADERS
+    mysql.h
+)
+
+set(SOURCES
+    mysql.cpp
+)
+
+find_package(MariaDB REQUIRED)
+
+target_sources(pica PRIVATE ${SOURCES})
+
+target_link_libraries(pica PRIVATE MariaDB::client)

database/mysql/mysql.cpp

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+#include "mysql.h"
+
+MySQL::MySQL():
+    DBInterface(Type::mysql),
+    connection(),
+    login(),
+    password(),
+    database()
+{
+    mysql_init(&connection);
+}
+
+MySQL::~MySQL() {
+    mysql_close(&connection);
+}
+
+
+void MySQL::connect(const std::string& path) {
+    if (state != State::disconnected)
+        return;
+
+    MYSQL* con = &connection;
+    MYSQL* res = mysql_real_connect(
+        con,
+        NULL,
+        login.c_str(),
+        password.c_str(),
+        database.empty() ? NULL : database.c_str(),
+        0,
+        path.c_str(),
+        0
+    );
+
+    if (res != con)
+        throw std::runtime_error(std::string("Error changing connecting: ") + mysql_error(con));
+
+    state = State::connected;
+}
+
+void MySQL::setCredentials(const std::string& login, const std::string& password) {
+    if (MySQL::login == login && MySQL::password == password)
+        return;
+
+    MySQL::login = login;
+    MySQL::password = password;
+
+    if (state == State::disconnected)
+        return;
+
+    MYSQL* con = &connection;
+    int result = mysql_change_user(
+        con,
+        login.c_str(),
+        password.c_str(),
+        database.empty() ? NULL : database.c_str()
+    );
+
+    if (result != 0)
+        throw std::runtime_error(std::string("Error changing credetials: ") + mysql_error(con));
+}
+
+void MySQL::setDatabase(const std::string& database) {
+    if (MySQL::database == database)
+        return;
+
+    MySQL::database = database;
+
+    if (state == State::disconnected)
+        return;
+
+    MYSQL* con = &connection;
+    int result = mysql_select_db(con, database.c_str());
+
+    if (result != 0)
+        throw std::runtime_error(std::string("Error changing db: ") + mysql_error(con));
+}
+
+void MySQL::disconnect() {
+    if (state == State::disconnected)
+        return;
+
+    MYSQL* con = &connection;
+    mysql_close(con);
+    mysql_init(con);            //this is ridiculous!
+}

database/mysql/mysql.h

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+#pragma once
+
+#include <stdexcept>
+
+#include <mysql.h>
+
+#include "database/dbinterface.h"
+
+class MySQL : public DBInterface {
+public:
+    MySQL();
+    ~MySQL() override;
+
+    void connect(const std::string& path) override;
+    void disconnect() override;
+    void setCredentials(const std::string& login, const std::string& password) override;
+    void setDatabase(const std::string& database) override;
+
+protected:
+    MYSQL connection;
+    std::string login;
+    std::string password;
+    std::string database;
+};