Bezig met crudmodel/tab

pglab/CrudModel.h

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+#ifndef CRUDMODEL_H
+#define CRUDMODEL_H
+
+#include "BaseTableModel.h"
+#include "ASyncDBConnection.h"
+#include "PgClass.h"
+#include "Pgsql_Connection.h"
+#include <memory>
+#include <vector>
+#include <boost/optional.hpp>
+
+class PgConstraint;
+class OpenDatase;
+
+/**
+ * @brief The CrudModel class
+ *
+ * Features
+ * - order by one or more user selectable columns
+ * - user filter condition
+ * - user limit and offset
+ * - hide columns (will not be retrieved can greatly speed up things when you disable wide columns)
+ * - can use foreign keys to display dropdown
+ *
+ * How to load data?
+ * - 2D array of QVariants won't be efficient
+ * - 2D array of strings
+ * - We do know the type of a single column is fixed
+ * - Keep data in Result and only load data in replacement rows
+ * std::string has short string optimization so this probably means
+ *  that a two dimensional array of std::string objects could actually be quite efficient!
+ */
+class CrudModel: public BaseTableModel {
+	Q_OBJECT
+public:
+	CrudModel();
+	~CrudModel();
+
+	QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+	void setData(std::shared_ptr<OpenDatabase> db, const PgClass &table);
+
+
+	// Basic functionality:
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+
+protected:
+	virtual Oid getType(int column) const override;
+	virtual QVariant getData(const QModelIndex &index) const override;
+
+private:
+	std::shared_ptr<OpenDatabase> m_database;
+	PgClass m_table;
+	boost::optional<PgConstraint> m_primaryKey;
+	ASyncDBConnection m_dbConn;
+
+
+	using RowData = std::vector<std::string>;
+	using RowDataPtr = std::unique_ptr<RowData>;
+	/** Choosen for a vector of pointers while vector is relatively slow with insertion and removal in the middle
+	 * I hope the small size of the elements will make this not much of an issue while the simple linear and sequential
+	 * nature of a vector will keep memory allocation fairly efficient.
+	using RowList = std::vector<RowDataPtr>;
+
+};
+
+#endif // CRUDMODEL_H