重构了连接数据库、设置设备名的代码，封装为类

databaseAPI.h

@@ -0,0 +1,83 @@
+#ifndef DATABASEAPI_H
+#define DATABASEAPI_H
+
+
+#include <QSqlDatabase>
+#include <QString>
+
+
+class Database
+{
+private:
+    QSqlDatabase db;
+    bool connected = false;
+    QString databaseName = QString("cardManageSystem");
+    QString userName = QString("cardManageSystem");
+
+public:
+    Database(QSqlDatabase database)
+    {
+        db = database;
+        db.setDatabaseName(databaseName);
+        db.setUserName(userName);
+    }
+
+    Database(QSqlDatabase database, QString hostName, int port, QString password)
+    {
+        db = database;
+        db.setDatabaseName(databaseName);
+        db.setUserName(userName);
+        db.setHostName(hostName);
+        db.setPort(port);
+        db.setPassword(password);
+    }
+
+    QSqlDatabase getDatabase()
+    {
+        return db;
+    }
+
+    void setHostName(QString hostName)
+    {
+        db.setHostName(hostName);
+    }
+
+    QString getHostName()
+    {
+        return db.hostName();
+    }
+
+    void setPort(int port)
+    {
+        db.setPort(port);
+    }
+
+    int getPort()
+    {
+        return db.port();
+    }
+
+    void setPassword(QString password)
+    {
+        db.setPassword(password);
+    }
+
+    bool is_connected()
+    {
+        return connected;
+    }
+
+    bool open()
+    {
+        connected = db.open();
+        return connected;
+    }
+
+    ~Database()
+    {
+        db.close();
+    }
+};
+
+
+#endif // DATABASEAPI_H