QSqlIndex Class

The QSqlIndex class provides functions to manipulate and describe database indexes. 更多...

頭：	`#include <QSqlIndex>`
CMake:	`find_package(Qt6 REQUIRED COMPONENTS Sql)` `target_link_libraries(mytarget PRIVATE Qt6::Sql)`
qmake:	`QT += sql`
繼承：	QSqlRecord

所有成員列錶，包括繼承成員
QSqlIndex is part of 數據庫類 .

特性

(從 6.8 起) cursorName : QString
(從 6.8 起) name : QString

公共函數

	QSqlIndex (const QString & cursorname = QString(), const QString & name = QString())
	QSqlIndex (const QSqlIndex & other )
`(從 6.6 起)`	QSqlIndex (QSqlIndex && other )
	~QSqlIndex ()
void	append (const QSqlField & field )
void	append (const QSqlField & field , bool desc )
QString	cursorName () const
bool	isDescending (int i ) const
QString	name () const
void	setCursorName (const QString & cursorName )
void	setDescending (int i , bool desc )
void	setName (const QString & name )
`(從 6.6 起)` QSqlIndex &	operator= (QSqlIndex && other )
QSqlIndex &	operator= (const QSqlIndex & other )

詳細描述

An index refers to a single table or view in a database. Information about the fields that comprise the index can be used to generate SQL statements.

特性文檔編製

`[since 6.8]` cursorName : QString

This property holds the name of the cursor which the index is associated with.

該特性在 Qt 6.8 引入。

訪問函數：

QString	cursorName () const
void	setCursorName (const QString & cursorName )

`[since 6.8]` name : QString

This property holds the name of the index.

該特性在 Qt 6.8 引入。

訪問函數：

QString	name () const
void	setName (const QString & name )

成員函數文檔編製

`[explicit]` QSqlIndex:: QSqlIndex (const QString & cursorname = QString(), const QString & name = QString())

Constructs an empty index using the cursor name cursorname and index name name .

QSqlIndex:: QSqlIndex (const QSqlIndex & other )

構造副本為 other .

`[noexcept, since 6.6]` QSqlIndex:: QSqlIndex ( QSqlIndex && other )

Move-constructs a new QSqlIndex from other .

注意： The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new value.

該函數在 Qt 6.6 引入。

`[noexcept]` QSqlIndex:: ~QSqlIndex ()

銷毀對象並釋放任何分配資源。

void QSqlIndex:: append (const QSqlField & field )

Appends the field field to the list of indexed fields. The field is appended with an ascending sort order.

void QSqlIndex:: append (const QSqlField & field , bool desc )

這是重載函數。

Appends the field field to the list of indexed fields. The field is appended with an ascending sort order, unless desc 為 true。

QString QSqlIndex:: cursorName () const

Returns the cursorName.

注意： Getter function for property cursorName.

另請參閱 setCursorName ().

bool QSqlIndex:: isDescending ( int i ) const

返迴 true if field i in the index is sorted in descending order; otherwise returns false .

QString QSqlIndex:: name () const

Returns the name.

注意： Getter function for property name.

另請參閱 setName ().

void QSqlIndex:: setCursorName (const QString & cursorName )

設置 cursorName to cursorName .

注意： setter 函數對於特性 cursorName .

另請參閱 cursorName ().

void QSqlIndex:: setDescending ( int i , bool desc )

若 desc is true, field i is sorted in descending order. Otherwise, field i is sorted in ascending order (the default). If the field does not exist, nothing happens.

另請參閱 isDescending ().

void QSqlIndex:: setName (const QString & name )

設置 name to name .

注意： setter 函數對於特性 name .

另請參閱 name ().

`[noexcept, since 6.6]` QSqlIndex &QSqlIndex:: operator= ( QSqlIndex && other )

移動賦值 other 到此 QSqlIndex 實例。