class QSqlTableModel

The QSqlTableModel class provides an editable data model for a single database table. More…

Inherited by: QSqlRelationalTableModel

Synopsis

Methods

• def __init__()

• def database()

• def editStrategy()

• def fieldIndex()

• def filter()

• def insertRecord()

• def isDirty()

• def primaryKey()

• def primaryValues()

• def setPrimaryKey()

• def setRecord()

• def tableName()

Virtual methods

• def deleteRowFromTable()

• def insertRowIntoTable()

• def orderByClause()

• def revertRow()

• def select()

• def selectRow()

• def selectStatement()

• def setEditStrategy()

• def setFilter()

• def setSort()

• def setTable()

• def updateRowInTable()

Slots

• def revertAll()

• def submitAll()

Signals

• def beforeDelete()

• def beforeInsert()

• def beforeUpdate()

• def primeInsert()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

QSqlTableModel is a high-level interface for reading and writing database records from a single table. It is built on top of the lower-level QSqlQuery and can be used to provide data to view classes such as QTableView. For example:

model = QSqlTableModel()
model.setTable("employee")
model.setEditStrategy(QSqlTableModel.OnManualSubmit)
model.select()
model.setHeaderData(0, Qt.Horizontal, tr("Name"))
model.setHeaderData(1, Qt.Horizontal, tr("Salary"))
view = QTableView()
view.setModel(model)
view.hideColumn(0) # don't show the ID
view.show()

We set the SQL table’s name and the edit strategy, then we set up the labels displayed in the view header. The edit strategy dictates when the changes done by the user in the view are actually applied to the database. The possible values are OnFieldChange , OnRowChange , and OnManualSubmit .

QSqlTableModel can also be used to access a database programmatically, without binding it to a view:

model = QSqlTableModel()
model.setTable("employee")
model.select()
salary = model.record(4).value("salary").toInt()

The code snippet above extracts the salary field from record 4 in the result set of the query SELECT * from employee.

It is possible to set filters using setFilter() , or modify the sort order using setSort() . At the end, you must call select() to populate the model with data.

The tablemodel example illustrates how to use QSqlTableModel as the data source for a QTableView.

QSqlTableModel provides no direct support for foreign keys. Use the QSqlRelationalTableModel and QSqlRelationalDelegate if you want to resolve foreign keys.

See also

QSqlRelationalTableModel QSqlQuery Table Model Example Cached SQL Table

class EditStrategy

This enum type describes which strategy to choose when editing values in the database.

Constant	Description
QSqlTableModel.OnFieldChange	All changes to the model will be applied immediately to the database.
QSqlTableModel.OnRowChange	Changes to a row will be applied when the user selects a different row.
QSqlTableModel.OnManualSubmit	All changes will be cached in the model until either submitAll() or revertAll() is called.

Note: To prevent inserting only partly initialized rows into the database, OnFieldChange will behave like OnRowChange for newly inserted rows.

See also

setEditStrategy()

__init__([parent=None[, db=QSqlDatabase()]])

Parameters:

• parent – QObject

• db – QSqlDatabase

Creates an empty QSqlTableModel and sets the parent to parent and the database connection to db. If db is not valid, the default database connection will be used.

The default edit strategy is OnRowChange .

beforeDelete(row)

Parameters:

row – int

This signal is emitted by deleteRowFromTable() before the row is deleted from the currently active database table.

beforeInsert(record)

Parameters:

record – QSqlRecord

This signal is emitted by insertRowIntoTable() before a new row is inserted into the currently active database table. The values that are about to be inserted are stored in record and can be modified before they will be inserted.

beforeUpdate(row, record)

Parameters:

• row – int

• record – QSqlRecord

This signal is emitted by updateRowInTable() before the row is updated in the currently active database table with the values from record.

Note that only values that are marked as generated will be updated. The generated flag can be set with setGenerated() and checked with isGenerated() .

See also

isGenerated()

database()

Return type:

QSqlDatabase

Returns the model’s database connection.

deleteRowFromTable(row)

Parameters:

row – int

Return type:

bool

Deletes the given row from the currently active database table.

This is a low-level method that operates directly on the database and should not be called directly. Use removeRow() or removeRows() to delete values. The model will decide depending on its edit strategy when to modify the database.

Returns true if the row was deleted; otherwise returns false.

See also

removeRows()

editStrategy()

Return type:

EditStrategy

Returns the current edit strategy.

See also

setEditStrategy()

fieldIndex(fieldName)

Parameters:

fieldName – str

Return type:

int

Returns the index of the field fieldName, or -1 if no corresponding field exists in the model.

filter()

Return type:

str

Returns the currently set filter.

See also

setFilter() select()

insertRecord(row, record)

Parameters:

• row – int

• record – QSqlRecord

Return type:

bool

Inserts the record at position row. If row is negative, the record will be appended to the end. Calls insertRows() and setRecord() internally.

Returns true if the record could be inserted, otherwise false.

Changes are submitted immediately for OnFieldChange and OnRowChange . Failure does not leave a new row in the model.

See also

insertRows() removeRows() setRecord()

insertRowIntoTable(values)

Parameters:

values – QSqlRecord

Return type:

bool

Inserts the values values into the currently active database table.

This is a low-level method that operates directly on the database and should not be called directly. Use insertRow() and setData() to insert values. The model will decide depending on its edit strategy when to modify the database.

Returns true if the values could be inserted, otherwise false. Error information can be retrieved with lastError() .

See also

lastError() insertRows()

isDirty()

Return type:

bool

This is an overloaded function.

Returns true if the model contains modified values that have not been committed to the database, otherwise false.

isDirty(index)

Parameters:

index – QModelIndex

Return type:

bool

Returns true if the value at the index index is dirty, otherwise false. Dirty values are values that were modified in the model but not yet written into the database.

If index is invalid or points to a non-existing row, false is returned.

orderByClause()

Return type:

str

Returns an SQL ORDER BY clause based on the currently set sort order.

See also

setSort() selectStatement()

primaryKey()

Return type:

QSqlIndex

Returns the primary key for the current table, or an empty QSqlIndex if the table is not set or has no primary key.

See also

setTable() setPrimaryKey() primaryIndex()

primaryValues(row)

Parameters:

row – int

Return type:

QSqlRecord

Returns a record containing the fields represented in the primary key set to the values at row. If no primary key is defined, the returned record will contain all fields.

See also

primaryKey()

primeInsert(row, record)

Parameters:

• row – int

• record – QSqlRecord

This signal is emitted by insertRows() , when an insertion is initiated in the given row of the currently active database table. The record parameter can be written to (since it is a reference), for example to populate some fields with default values and set the generated flags of the fields. Do not try to edit the record via other means such as setData() or setRecord() while handling this signal.

revertAll()

Reverts all pending changes.

See also

revert() revertRow() submitAll()

revertRow(row)

Parameters:

row – int

Reverts all changes for the specified row.

See also

revert() revertAll() submit() submitAll()

select()

Return type:

bool

Populates the model with data from the table that was set via setTable() , using the specified filter and sort condition, and returns true if successful; otherwise returns false.

Note

Calling select() will revert any unsubmitted changes and remove any inserted columns.

See also

setTable() setFilter() selectStatement()

selectRow(row)

Parameters:

row – int

Return type:

bool

Refreshes row in the model with values from the database table row matching on primary key values. Without a primary key, all column values must match. If no matching row is found, the model will show an empty row.

Returns true if successful; otherwise returns false.

See also

select()

selectStatement()

Return type:

str

Returns the SQL SELECT statement used internally to populate the model. The statement includes the filter and the ORDER BY clause.

See also

filter() orderByClause()

setEditStrategy(strategy)

Parameters:

strategy – EditStrategy

Sets the strategy for editing values in the database to strategy.

This will revert any pending changes.

See also

editStrategy() revertAll()

setFilter(filter)

Parameters:

filter – str

Sets the current filter to filter.

The filter is a SQL WHERE clause without the keyword WHERE (for example, name='Josephine').

If the model is already populated with data from a database, the model re-selects it with the new filter. Otherwise, the filter will be applied the next time select() is called.

See also

filter() select() selectStatement() orderByClause()

setPrimaryKey(key)

Parameters:

key – QSqlIndex

Protected method that allows subclasses to set the primary key to key.

Normally, the primary index is set automatically whenever you call setTable() .

See also

primaryKey() primaryIndex()

setRecord(row, record)

Parameters:

• row – int

• record – QSqlRecord

Return type:

bool

Applies values to the row in the model. The source and target fields are mapped by field name, not by position in the record.

Note that the generated flags in values are preserved to determine whether the corresponding fields are used when changes are submitted to the database. By default, it is set to true for all fields in a QSqlRecord . You must set the flag to false using setGenerated (false) for any value in values, to save changes back to the database.

For edit strategies OnFieldChange and OnRowChange , a row may receive a change only if no other row has a cached change. Changes are submitted immediately. Submitted changes are not reverted upon failure.

Returns true if all the values could be set; otherwise returns false.

See also

record() editStrategy()

setSort(column, order)

Parameters:

• column – int

• order – SortOrder

Sets the sort order for column to order. This does not affect the current data, to refresh the data using the new sort order, call select() .

See also

sort() select() orderByClause()

setTable(tableName)

Parameters:

tableName – str

Sets the database table on which the model operates to tableName. Does not select data from the table, but fetches its field information.

To populate the model with the table’s data, call select() .

Error information can be retrieved with lastError() .

See also

select() setFilter() lastError()

submitAll()

Return type:

bool

Submits all pending changes and returns true on success. Returns false on error, detailed error information can be obtained with lastError() .

In OnManualSubmit , on success the model will be repopulated. Any views presenting it will lose their selections.

Note: In OnManualSubmit mode, already submitted changes won’t be cleared from the cache when submitAll() fails. This allows transactions to be rolled back and resubmitted without losing data.

See also

revertAll() lastError()

tableName()

Return type:

str

Returns the name of the currently selected table.

updateRowInTable(row, values)

Parameters:

• row – int

• values – QSqlRecord

Return type:

bool

Updates the given row in the currently active database table with the specified values. Returns true if successful; otherwise returns false.

This is a low-level method that operates directly on the database and should not be called directly. Use setData() to update values. The model will decide depending on its edit strategy when to modify the database.

Note that only values that have the generated-flag set are updated. The generated-flag can be set with setGenerated() and tested with isGenerated() .

See also

isGenerated() setData()