Query Builder for layers. More...

#include <qgsquerybuilder.h>

Collaboration diagram for QgsQueryBuilder:

Public Slots
void	accept ()
void	reject ()
void	clear ()
void	on_btnEqual_clicked ()
void	on_btnLessThan_clicked ()
void	on_btnGreaterThan_clicked ()
void	on_btnPct_clicked ()
void	on_btnIn_clicked ()
void	on_btnNotIn_clicked ()
void	on_btnLike_clicked ()
void	on_btnILike_clicked ()
QString	sql ()
void	setSql (QString sqlStatement)
void	on_lstFields_clicked (const QModelIndex &index)
void	on_lstFields_doubleClicked (const QModelIndex &index)
void	on_lstValues_doubleClicked (const QModelIndex &index)
void	on_btnLessEqual_clicked ()
void	on_btnGreaterEqual_clicked ()
void	on_btnNotEqual_clicked ()
void	on_btnAnd_clicked ()
void	on_btnNot_clicked ()
void	on_btnOr_clicked ()
void	on_buttonBox_helpRequested ()
void	test ()
void	on_btnGetAllValues_clicked ()
void	on_btnSampleValues_clicked ()
void	setDatasourceDescription (QString uri)

Public Member Functions
	QgsQueryBuilder (QgsVectorLayer layer, QWidget parent=0, Qt::WFlags fl=QgisGui::ModalDialogFlags)
	~QgsQueryBuilder ()

Private Member Functions
void	populateFields ()
void	setupGuiViews ()
void	setupLstFieldsModel ()
void	fillValues (int idx, int limit)

Private Attributes
QStandardItemModel *	mModelFields
	Model for fields ListView.
QStandardItemModel *	mModelValues
	Model for values ListView.
int	mPreviousFieldRow
	Previous field row to delete model.
QgsVectorLayer *	mLayer
	vector layer
QString	mOrigSubsetString
	original subset string

Detailed Description

Query Builder for layers.

The query builder allows interactive creation of a SQL for limiting the features displayed in a database layer. The fields in the table are displayed and sample values (or all values) can be viewed to aid in constructing the query. A test function returns the number of features that will be returned.

Definition at line 40 of file qgsquerybuilder.h.

Constructor & Destructor Documentation

QgsQueryBuilder::QgsQueryBuilder	(	QgsVectorLayer *	layer,
		QWidget *	parent = `0`,
		Qt::WFlags	fl = `QgisGui::ModalDialogFlags`
	)

This constructor is used when the query builder is called from the vector layer properties dialog

Parameters

layer	existing vector layer
parent	Parent widget
fl	dialog flags

Definition at line 27 of file qgsquerybuilder.cpp.

References clear(), mLayer, mOrigSubsetString, QgsMapLayer::name(), populateFields(), setupGuiViews(), QgsVectorLayer::subsetString(), test(), and tr.

QgsQueryBuilder::~QgsQueryBuilder ( )

Definition at line 58 of file qgsquerybuilder.cpp.

Member Function Documentation

void QgsQueryBuilder::accept ( )

slot

Definition at line 218 of file qgsquerybuilder.cpp.

References QgsVectorDataProvider::clearErrors(), QgsVectorLayer::dataProvider(), QgsVectorDataProvider::errors(), QgsVectorDataProvider::hasErrors(), mLayer, QgsVectorLayer::setSubsetString(), and tr.

void QgsQueryBuilder::clear ( )

slot

Definition at line 372 of file qgsquerybuilder.cpp.

References mLayer, and QgsVectorLayer::setSubsetString().

Referenced by QgsQueryBuilder().

void QgsQueryBuilder::fillValues	(	int	idx,
		int	limit
	)

private

Definition at line 102 of file qgsquerybuilder.cpp.

References isNull(), mLayer, mModelValues, QgsVectorLayer::providerType(), QgsDebugMsg, QgsVectorLayer::storageType(), and QgsVectorLayer::uniqueValues().

Referenced by on_btnGetAllValues_clicked(), and on_btnSampleValues_clicked().

void QgsQueryBuilder::on_btnAnd_clicked ( )

slot

Definition at line 354 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnEqual_clicked ( )

slot

Definition at line 250 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnGetAllValues_clicked ( )

slot

Get all distinct values for the field. Values are inserted into the value list box

Definition at line 161 of file qgsquerybuilder.cpp.

References fillValues(), mLayer, mModelFields, mModelValues, QgsVectorLayer::setSubsetString(), and QgsVectorLayer::subsetString().

void QgsQueryBuilder::on_btnGreaterEqual_clicked ( )

slot

Definition at line 342 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnGreaterThan_clicked ( )

slot

Definition at line 262 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnILike_clicked ( )

slot

Definition at line 379 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnIn_clicked ( )

slot

Definition at line 274 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnLessEqual_clicked ( )

slot

Definition at line 336 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnLessThan_clicked ( )

slot

Definition at line 256 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnLike_clicked ( )

slot

Definition at line 286 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnNot_clicked ( )

slot

Definition at line 360 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnNotEqual_clicked ( )

slot

Definition at line 348 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnNotIn_clicked ( )

slot

Definition at line 280 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnOr_clicked ( )

slot

Definition at line 366 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnPct_clicked ( )

slot

Definition at line 268 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::on_btnSampleValues_clicked ( )

slot

Get sample distinct values for the selected field. The sample size is limited to an arbitrary value (currently set to 25). The values are inserted into the values list box.

Definition at line 134 of file qgsquerybuilder.cpp.

References fillValues(), mLayer, mModelFields, mModelValues, QgsVectorLayer::setSubsetString(), and QgsVectorLayer::subsetString().

void QgsQueryBuilder::on_buttonBox_helpRequested ( )

inlineslot

Definition at line 79 of file qgsquerybuilder.h.

References QgsContextHelp::run().

void QgsQueryBuilder::on_lstFields_clicked ( const QModelIndex & index )

slot

Definition at line 302 of file qgsquerybuilder.cpp.

References mModelValues, and mPreviousFieldRow.

void QgsQueryBuilder::on_lstFields_doubleClicked ( const QModelIndex & index )

slot

Definition at line 315 of file qgsquerybuilder.cpp.

References mLayer, mModelFields, and QgsVectorLayer::pendingFields().

void QgsQueryBuilder::on_lstValues_doubleClicked ( const QModelIndex & index )

slot

Definition at line 321 of file qgsquerybuilder.cpp.

References mLayer, mModelValues, QgsVectorLayer::providerType(), and QgsVectorLayer::storageType().

void QgsQueryBuilder::populateFields ( )

private

Populate the field list for the selected table

Definition at line 64 of file qgsquerybuilder.cpp.

References QgsFields::count(), mLayer, mModelFields, QgsVectorLayer::pendingFields(), and setupLstFieldsModel().

Referenced by QgsQueryBuilder().

void QgsQueryBuilder::reject ( )

slot

Definition at line 242 of file qgsquerybuilder.cpp.

References mLayer, mOrigSubsetString, QgsVectorLayer::setSubsetString(), and QgsVectorLayer::subsetString().

void QgsQueryBuilder::setDatasourceDescription ( QString uri )

slot

Definition at line 385 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::setSql ( QString sqlStatement )

slot

Definition at line 297 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::setupGuiViews ( )

private

Setup models for listviews

Definition at line 84 of file qgsquerybuilder.cpp.

References mModelFields, and mModelValues.

Referenced by QgsQueryBuilder().

void QgsQueryBuilder::setupLstFieldsModel ( )

private

Definition at line 79 of file qgsquerybuilder.cpp.

References mModelFields.

Referenced by populateFields().

QString QgsQueryBuilder::sql ( )

slot

Definition at line 292 of file qgsquerybuilder.cpp.

void QgsQueryBuilder::test ( )

slot

Test the constructed sql statement to see if the database likes it. The number of rows that would be returned is displayed in a message box. The test uses a "select count(*) from ..." query to test the SQL statement.

Definition at line 188 of file qgsquerybuilder.cpp.

References QgsVectorDataProvider::clearErrors(), QgsVectorLayer::dataProvider(), QgsVectorDataProvider::errors(), QgsVectorLayer::featureCount(), QgsVectorDataProvider::hasErrors(), mLayer, QgsVectorLayer::setSubsetString(), QgsVectorLayer::subsetString(), and tr.

Referenced by QgsQueryBuilder().