# QSqlQueryModel Class Reference
## [[QtSql](index.htm) module]
该QSqlQueryModel类为SQL结果集的只读数据模型。[More...](#details)
继承[QAbstractTableModel](qabstracttablemodel.html)。
通过继承[QSqlTableModel](qsqltablemodel.html)。
### Methods
* `__init__ (self, QObject parent = None)`
* `bool canFetchMore (self, QModelIndex parent = QModelIndex())`
* `clear (self)`
* `int columnCount (self, QModelIndex parent = QModelIndex())`
* `QVariant data (self, QModelIndex item, int role = Qt.DisplayRole)`
* `fetchMore (self, QModelIndex parent = QModelIndex())`
* `QVariant headerData (self, int section, Qt.Orientation orientation, int role = Qt.DisplayRole)`
* `QModelIndex indexInQuery (self, QModelIndex item)`
* `bool insertColumns (self, int column, int count, QModelIndex parent = QModelIndex())`
* `QSqlError lastError (self)`
* `QSqlQuery query (self)`
* `queryChange (self)`
* `QSqlRecord record (self, int row)`
* `QSqlRecord record (self)`
* `bool removeColumns (self, int column, int count, QModelIndex parent = QModelIndex())`
* `int rowCount (self, QModelIndex parent = QModelIndex())`
* `bool setHeaderData (self, int section, Qt.Orientation orientation, QVariant value, int role = Qt.EditRole)`
* `setLastError (self, QSqlError error)`
* `setQuery (self, QSqlQuery query)`
* `setQuery (self, QString query, QSqlDatabase db = QSqlDatabase())`
* * *
## Detailed Description
该QSqlQueryModel类为SQL结果集的只读数据模型。
QSqlQueryModel是用于执行SQL语句并遍历结果集一个高层次的接口。它是建立在较低级别的顶[QSqlQuery](qsqlquery.html)并且可以用来提供数据可以看到类如[QTableView](qtableview.html)。例如：
```
QSqlQueryModel *model = new QSqlQueryModel;
model->setQuery("SELECT name, salary FROM employee");
model->setHeaderData(0, [Qt](qt.html).Horizontal, tr("Name"));
model->setHeaderData(1, [Qt](qt.html).Horizontal, tr("Salary"));
[QTableView](qtableview.html) *view = new [QTableView](qtableview.html);
view->setModel(model);
view->show();
```
我们建立模型的查询，然后我们设置视图中的标题显示的标籤。
QSqlQueryModel也可以用来访问数据库编程，不绑定到一个视图：
```
QSqlQueryModel model;
model.setQuery("SELECT * FROM employee");
int salary = model.record(4).value("salary").toInt();
```
上面的代码片段中提取`salary`从查询的结果集记录4场`SELECT * from employee`。假设`salary`是第2列，我们可以重写最后一行，如下所示：
```
int salary = model.data(model.index(4, 2)).toInt();
```
该模型是只读的默认。为了使读写，你必须继承它，并重新实现[setData](qabstractitemmodel.html#setData)（）和[flags](qabstractitemmodel.html#flags)（ ） 。另一个选项是使用[QSqlTableModel](qsqltablemodel.html)，它提供了基于单个数据库表中的读 - 写的模式。
该[sql/querymodel](index.htm)示例说明了如何使用QSqlQueryModel以显示查询的结果。它也显示了如何继承QSqlQueryModel显示给用户之前自定义数据的内容，以及如何创建基于QSqlQueryModel一个读写模式。
如果数据库没有返回在查询中选择的行数，该模型将逐步获取行。看[fetchMore](qsqlquerymodel.html#fetchMore)（ ）获取更多信息。
* * *
## Method Documentation
```
QSqlQueryModel.__init__ (self, QObject parent = None)
```
该_parent_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。
创建一个空的[QSqlQueryModel](qsqlquerymodel.html)用给定的_parent_。
```
bool QSqlQueryModel.canFetchMore (self, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.canFetchMore](qabstractitemmodel.html#canFetchMore)（ ） 。
返回True如果有可能从数据库中读取更多的行。这只会影响数据库不报到查询的尺寸（见[QSqlDriver.hasFeature](qsqldriver.html#hasFeature)（））。
_parent_应始终为无效[QModelIndex](qmodelindex.html)。
这个函数是Qt 4.1中引入。
**See also** [fetchMore](qsqlquerymodel.html#fetchMore)（ ） 。
```
QSqlQueryModel.clear (self)
```
清除模型，并释放任何收购资源。
```
int QSqlQueryModel.columnCount (self, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.columnCount](qabstractitemmodel.html#columnCount)（ ） 。
```
QVariant QSqlQueryModel.data (self, QModelIndex item, int role = Qt.DisplayRole)
```
从重新实现[QAbstractItemModel.data](qabstractitemmodel.html#data)（ ） 。
返回值指定_item_和_role_。
If _item_超出范围，或者如果发生错误，无效的[QVariant](qvariant.html)返回。
**See also** [lastError](qsqlquerymodel.html#lastError)（ ） 。
```
QSqlQueryModel.fetchMore (self, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.fetchMore](qabstractitemmodel.html#fetchMore)（ ） 。
获取从数据库中多个行。这只会影响数据库不报到查询的尺寸（见[QSqlDriver.hasFeature](qsqldriver.html#hasFeature)（））。
要强制整个结果集的抓取，你可以使用以下命令：
```
while (myModel->canFetchMore())
myModel->fetchMore();
```
_parent_应始终为无效[QModelIndex](qmodelindex.html)。
这个函数是Qt 4.1中引入。
**See also** [canFetchMore](qsqlquerymodel.html#canFetchMore)（ ） 。
```
QVariant QSqlQueryModel.headerData (self, int section, Qt.Orientation orientation, int role = Qt.DisplayRole)
```
从重新实现[QAbstractItemModel.headerData](qabstractitemmodel.html#headerData)（ ） 。
返回头数据为给定的_role_在_section_用指定的标头_orientation_。
**See also** [setHeaderData](qsqlquerymodel.html#setHeaderData)（ ） 。
```
QModelIndex QSqlQueryModel.indexInQuery (self, QModelIndex item)
```
[
返回在给定的数据库中的结果集的值的索引_item_在模型中。
返回值是相同的_item_如果已经插入任何行或列，删除或移动了。
返回一个无效的模型索引，如果_item_超出范围或_item_不指向结果集中的值。
](qmodelindex.html)
[**See also**](qmodelindex.html) [QSqlTableModel.indexInQuery](qsqltablemodel.html#indexInQuery)（ ）[insertColumns](qsqlquerymodel.html#insertColumns)（）和[removeColumns](qsqlquerymodel.html#removeColumns)（ ） 。
```
bool QSqlQueryModel.insertColumns (self, int column, int count, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.insertColumns](qabstractitemmodel.html#insertColumns)（ ） 。
Inserts _count_列到模型的位置_column_。该_parent_参数必须始终是一个无效的[QModelIndex](qmodelindex.html)，因为该模型不支持父子关系。
返回True如果_column_是在一定范围内，否则返回False 。
默认情况下，插入的列是空的。为了填补他们的数据，重新实现[data](qsqlquerymodel.html#data)（ ）并单独处理任何插入的列：
```
[QVariant](qvariant.html) MyModel.data(const [QModelIndex](qmodelindex.html) &item, int role) const
{
if (item.column() == m_specialColumnNo) {
// handle column separately
}
return [QSqlQueryModel](qsqlquerymodel.html).data(item, role);
}
```
**See also** [removeColumns](qsqlquerymodel.html#removeColumns)（ ） 。
```
QSqlError QSqlQueryModel.lastError (self)
```
[
返回有关数据库上发生的最后一个错误信息。
](qsqlerror.html)
[**See also**](qsqlerror.html) [setLastError](qsqlquerymodel.html#setLastError)（）和[query](qsqlquerymodel.html#query)（ ） 。
```
QSqlQuery QSqlQueryModel.query (self)
```
[](qsqlquery.html)
[返回](qsqlquery.html)[QSqlQuery](qsqlquery.html)与此模型相关。
**See also** [setQuery](qsqlquerymodel.html#setQuery)（ ） 。
```
QSqlQueryModel.queryChange (self)
```
这个虚函数被调用时查询改变。默认实现不执行任何操作。
[query](qsqlquerymodel.html#query)（ ）返回新的查询。
**See also** [query](qsqlquerymodel.html#query)（）和[setQuery](qsqlquerymodel.html#setQuery)（ ） 。
```
QSqlRecord QSqlQueryModel.record (self, int row)
```
[
返回有关当前查询的字段包含记录信息。如果_row_是一个有效的行的索引，该记录将被填入该行的值。
如果模型没有被初始化，一个空的记录将被退回。
](qsqlrecord.html)
[**See also**](qsqlrecord.html) [QSqlRecord.isEmpty](qsqlrecord.html#isEmpty)（ ） 。
```
QSqlRecord QSqlQueryModel.record (self)
```
[
这是一个重载函数。
返回有关当前查询的字段为空的记录包含的信息。
如果模型没有被初始化，一个空的记录将被退回。
](qsqlrecord.html)
[**See also**](qsqlrecord.html) [QSqlRecord.isEmpty](qsqlrecord.html#isEmpty)（ ） 。
```
bool QSqlQueryModel.removeColumns (self, int column, int count, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.removeColumns](qabstractitemmodel.html#removeColumns)（ ） 。
移除_count_从模型中的列从位置开始_column_。该_parent_参数必须始终是一个无效的[QModelIndex](qmodelindex.html)，因为该模型不支持父子关系。
删除列有效地隐藏它们。它不影响相关[QSqlQuery](qsqlquery.html)。
返回True如果被删除的列，否则返回False 。
```
int QSqlQueryModel.rowCount (self, QModelIndex parent = QModelIndex())
```
从重新实现[QAbstractItemModel.rowCount](qabstractitemmodel.html#rowCount)（ ） 。
如果数据库支持返回查询的尺寸（见[QSqlDriver.hasFeature](qsqldriver.html#hasFeature)（））时，返回的行的当前查询的数量。否则，将返回客户端上当前缓存的行数。
_parent_应始终为无效[QModelIndex](qmodelindex.html)。
这个函数是Qt 4.1中引入。
**See also** [canFetchMore](qsqlquerymodel.html#canFetchMore)（）和[QSqlDriver.hasFeature](qsqldriver.html#hasFeature)（ ） 。
```
bool QSqlQueryModel.setHeaderData (self, int section, Qt.Orientation orientation, QVariant value, int role = Qt.EditRole)
```
从重新实现[QAbstractItemModel.setHeaderData](qabstractitemmodel.html#setHeaderData)（ ） 。
设置的标题指定一个水平标题_role_至_value_。如果模型被用来在一个视图中显示的数据（例如这是有用的，[QTableView](qtableview.html)） 。
返回True如果_orientation_ is [Qt.Horizontal](qt.html#Orientation-enum)和_section_指的是一个有效的部分，否则返回False 。
注意，该功能不能用于在数据库中的修改值，因为该模型是只读的。
**See also** [headerData](qsqlquerymodel.html#headerData)（）和[data](qsqlquerymodel.html#data)（ ） 。
```
QSqlQueryModel.setLastError (self, QSqlError error)
```
保护功能，允许派生类对设置在数据库上发生的最后一个错误的值_error_。
**See also** [lastError](qsqlquerymodel.html#lastError)（ ） 。
```
QSqlQueryModel.setQuery (self, QSqlQuery query)
```
重置模型，并将数据提供给被给定的_query_。请注意，查询必须处于活动状态，且不能是isForwardOnly （ ） 。
[lastError](qsqlquerymodel.html#lastError)（ ）可以用来获取详细信息，如果有错误设置查询。
**Note:**调用setQuery （ ）将删除任何插入的列。
**See also** [query](qsqlquerymodel.html#query)（ ）[QSqlQuery.isActive](qsqlquery.html#isActive)（ ）[QSqlQuery.setForwardOnly](qsqlquery.html#setForwardOnly)（）和[lastError](qsqlquerymodel.html#lastError)（ ） 。
```
QSqlQueryModel.setQuery (self, QString query, QSqlDatabase db = QSqlDatabase())
```
这是一个重载函数。
执行查询_query_对于给定的数据库连接_db_。如果没有指定的数据库（或无效的数据库） ，则使用默认连接。
[lastError](qsqlquerymodel.html#lastError)（ ）可以用来获取详细信息，如果有错误设置查询。
例如：
```
[QSqlQueryModel](qsqlquerymodel.html) model;
model.setQuery("select * from MyTable");
if (model.lastError().isValid())
qDebug() << model.lastError();
```
**See also** [query](qsqlquerymodel.html#query)（ ）[queryChange](qsqlquerymodel.html#queryChange)（）和[lastError](qsqlquerymodel.html#lastError)（ ） 。
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- QPyDesignerCustomWidgetPlugin Class Reference
- QPyDesignerMemberSheetExtension Class Reference
- QPyDesignerPropertySheetExtension Class Reference
- QPyDesignerTaskMenuExtension Class Reference
- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译：Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference