initial commit

2025-09-01 20:47:58 +08:00
commit 12c51b5ddb
843 changed files with 475321 additions and 0 deletions
@@ -0,0 +1,113 @@
+//
+// Limit.h
+//
+// Library: Data
+// Package: DataCore
+// Module:  Limit
+//
+// Definition of the Limit class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Data_Limit_INCLUDED
+#define Data_Limit_INCLUDED
+
+
+#include "Poco/Data/Data.h"
+
+
+namespace Poco {
+namespace Data {
+
+
+class Data_API Limit
+	/// Limit stores information how many rows a query should return.
+{
+public:
+	typedef Poco::UInt32 SizeT;
+
+	enum Type
+	{
+		LIMIT_UNLIMITED = ~((SizeT) 0)
+	};
+	
+	Limit(SizeT value, bool hardLimit = false, bool isLowerLimit = false);
+		/// Creates the Limit. 
+		///
+		/// Value contains the upper row hint, if hardLimit is set to true, the limit acts as a hard
+		/// border, ie. every query must return exactly value rows, returning more than value objects will throw an exception!
+		/// LowerLimits always act as hard-limits!
+		///
+		/// A value of LIMIT_UNLIMITED disables the limit.
+
+	~Limit();
+		/// Destroys the Limit.
+
+	SizeT value() const;
+		/// Returns the value of the limit
+
+	bool isHardLimit() const;
+		/// Returns true if the limit is a hard limit.
+
+	bool isLowerLimit() const;
+		/// Returns true if the limit is a lower limit, otherwise it is an upperLimit
+
+	bool operator == (const Limit& other) const;
+		/// Equality operator.
+
+	bool operator != (const Limit& other) const;
+		/// Inequality operator.
+
+private:
+	SizeT _value;
+	bool  _hardLimit;
+	bool  _isLowerLimit;
+};
+
+
+//
+// inlines
+//
+inline Poco::UInt32 Limit::value() const
+{
+	return _value;
+}
+
+
+inline bool Limit::isHardLimit() const
+{
+	return _hardLimit;
+}
+
+
+inline bool Limit::isLowerLimit() const
+{
+	return _isLowerLimit;
+}
+
+
+inline bool Limit::operator == (const Limit& other) const
+{
+	return other._value == _value &&
+		other._hardLimit == _hardLimit &&
+		other._isLowerLimit == _isLowerLimit;
+}
+
+
+inline bool Limit::operator != (const Limit& other) const
+{
+	return other._value != _value ||
+		other._hardLimit != _hardLimit ||
+		other._isLowerLimit != _isLowerLimit;
+}
+
+
+} } // namespace Poco::Data
+
+
+#endif // Data_Limit_INCLUDED