RWDBRow

Module:  DB Interface Module   Group:  Utility and Diagnostics Classes

RWDBRow  RWCollectable

• Local Index
• Synopsis
• Description
• Public Constructors
• Public Destructor
• Public Member Operators
• Public Member Functions

Members

append() clearAndDestroy()

entries() operator=()

operator[]() RWDBRow()

~RWDBRow()

#include <rw/db/row.h>

RWDBRow& r = myMemTable[i];

RWDBRow is an ordered collection of RWDBValues. RWDBRow is a relatively low level construct used by the DB Interface Module to store a row of data on its way to or from the database. It is visible to applications for two reasons:

• An RWDBRow is a single row of an RWDBMemTable.

• Some applications may want to manage raw data without knowing anything about its structure. RWDBRow can be used as a container in these cases.

The only semantics that RWDBRow adds to RWCollectable are:

• The index operators [] return RWDBValue&, rather than RWCollectable*&.

• The destructor deallocates the contents of the RWDBRow by calling clearAndDestroy().

RWDBRow is designed around the Interface/Implementation paradigm. An RWDBRow instance is an interface to a reference-counted implementation; copy constructors and assignment operators produce additional references to a shared implementation.

RWDBRow();

The default constructor produces an empty RWDBRow.

RWDBRow(const RWDBRow& rvalue);

Copy constructor. The created RWDBRow shares an implementation with rvalue.

virtual ~RWDBRow();

The default destructor.

RWDBRow& 
operator=(const RWDBRow& rvalue);

Assignment operator.

RWDBValue&
operator[](size_t index) const;

Returns a reference to the RWDBValue at position index in the collection. An exception of type RWBoundsErr is thrown if index is out of range.

virtual void
append(const RWDBValue& value);

Appends value to self.

virtual size_t
entries();

Returns the total number of values in the collection.

virtual void
clearAndDestroy();

Removes all values from the collection and deletes them.

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