QSqlDatabase¶

Inheritance diagram of QSqlDatabase

Synopsis¶

Functions¶

def close ()
def commit ()
def connectOptions ()
def connectionName ()
def databaseName ()
def driver ()
def driverName ()
def exec_ ([query=”“])
def hostName ()
def isOpen ()
def isOpenError ()
def isValid ()
def lastError ()
def numericalPrecisionPolicy ()
def open ()
def open (user, password)
def password ()
def port ()
def primaryIndex (tablename)
def record (tablename)
def rollback ()
def setConnectOptions ([options=”“])
def setDatabaseName (name)
def setHostName (host)
def setNumericalPrecisionPolicy (precisionPolicy)
def setPassword (password)
def setPort (p)
def setUserName (name)
def tables ([type=QSql.Tables])
def transaction ()
def userName ()

Static functions¶

def addDatabase (driver[, connectionName=QLatin1String(defaultConnection)])
def addDatabase (type[, connectionName=QLatin1String(defaultConnection)])
def cloneDatabase (other, connectionName)
def connectionNames ()
def contains ([connectionName=QLatin1String(defaultConnection)])
def database ([connectionName=QLatin1String(defaultConnection)[, open=true]])
def drivers ()
def isDriverAvailable (name)
def registerSqlDriver (name, creator)
def removeDatabase (connectionName)

Detailed Description¶

The PySide.QtSql.QSqlDatabase class represents a connection to a database.

The PySide.QtSql.QSqlDatabase class provides an interface for accessing a database through a connection. An instance of PySide.QtSql.QSqlDatabase represents the connection. The connection provides access to the database via one of the supported database drivers , which are derived from PySide.QtSql.QSqlDriver . Alternatively, you can subclass your own database driver from PySide.QtSql.QSqlDriver . See How to Write Your Own Database Driver for more information.

Create a connection (i.e., an instance of PySide.QtSql.QSqlDatabase ) by calling one of the static PySide.QtSql.QSqlDatabase.addDatabase() functions, where you specify the driver or type of driver to use (i.e., what kind of database will you access?) and a connection name. A connection is known by its own name, not by the name of the database it connects to. You can have multiple connections to one database. PySide.QtSql.QSqlDatabase also supports the concept of a default connection, which is the unnamed connection. To create the default connection, don’t pass the connection name argument when you call PySide.QtSql.QSqlDatabase.addDatabase() . Subsequently, when you call any static member function that takes the connection name argument, if you don’t pass the connection name argument, the default connection is assumed. The following snippet shows how to create and open a default connection to a PostgreSQL database:
db = QSqlDatabase.addDatabase("QPSQL")
db.setHostName("acidalia")
db.setDatabaseName("customdb")
db.setUserName("mojito")
db.setPassword("J0a1m8")
ok = db.open()
Once the PySide.QtSql.QSqlDatabase object has been created, set the connection parameters with PySide.QtSql.QSqlDatabase.setDatabaseName() , PySide.QtSql.QSqlDatabase.setUserName() , PySide.QtSql.QSqlDatabase.setPassword() , PySide.QtSql.QSqlDatabase.setHostName() , PySide.QtSql.QSqlDatabase.setPort() , and PySide.QtSql.QSqlDatabase.setConnectOptions() . Then call PySide.QtSql.QSqlDatabase.open() to activate the physical connection to the database. The connection is not usable until you open it.

The connection defined above will be the default connection, because we didn’t give a connection name to PySide.QtSql.QSqlDatabase.addDatabase() . Subsequently, you can get the default connection by calling PySide.QtSql.QSqlDatabase.database() without the connection name argument:
db = QSqlDatabase.database()
PySide.QtSql.QSqlDatabase is a value class. Changes made to a database connection via one instance of PySide.QtSql.QSqlDatabase will affect other instances of PySide.QtSql.QSqlDatabase that represent the same connection. Use PySide.QtSql.QSqlDatabase.cloneDatabase() to create an independent database connection based on an existing one.

If you create multiple database connections, specify a unique connection name for each one, when you call PySide.QtSql.QSqlDatabase.addDatabase() . Use PySide.QtSql.QSqlDatabase.database() with a connection name to get that connection. Use PySide.QtSql.QSqlDatabase.removeDatabase() with a connection name to remove a connection. PySide.QtSql.QSqlDatabase outputs a warning if you try to remove a connection referenced by other PySide.QtSql.QSqlDatabase objects. Use PySide.QtSql.QSqlDatabase.contains() to see if a given connection name is in the list of connections.

Once a connection is established, you can call PySide.QtSql.QSqlDatabase.tables() to get the list of tables in the database, call PySide.QtSql.QSqlDatabase.primaryIndex() to get a table’s primary index, and call PySide.QtSql.QSqlDatabase.record() to get meta-information about a table’s fields (e.g., field names).

Note

QSqlDatabase.exec() is deprecated. Use QSqlQuery.exec() instead.

If the driver supports transactions, use PySide.QtSql.QSqlDatabase.transaction() to start a transaction, and PySide.QtSql.QSqlDatabase.commit() or PySide.QtSql.QSqlDatabase.rollback() to complete it. Use PySide.QtSql.QSqlDriver.hasFeature() to ask if the driver supports transactions. Note: When using transactions, you must start the transaction before you create your query.

If an error occurrs, PySide.QtSql.QSqlDatabase.lastError() will return information about it.

Get the names of the available SQL drivers with PySide.QtSql.QSqlDatabase.drivers() . Check for the presence of a particular driver with PySide.QtSql.QSqlDatabase.isDriverAvailable() . If you have created your own custom driver, you must register it with PySide.QtSql.QSqlDatabase.registerSqlDriver() .

See also

PySide.QtSql.QSqlDriver PySide.QtSql.QSqlQuery QtSql Module Threads and the SQL Module

class PySide.QtSql.QSqlDatabase¶

class PySide.QtSql.QSqlDatabase(driver)

class PySide.QtSql.QSqlDatabase(other)

class PySide.QtSql.QSqlDatabase(type)

Parameters:	driver – `PySide.QtSql.QSqlDriver` other – `PySide.QtSql.QSqlDatabase` type – unicode

Creates an empty, invalid PySide.QtSql.QSqlDatabase object. Use PySide.QtSql.QSqlDatabase.addDatabase() , PySide.QtSql.QSqlDatabase.removeDatabase() , and PySide.QtSql.QSqlDatabase.database() to get valid PySide.QtSql.QSqlDatabase objects.

This is an overloaded function.

Creates a database connection using the given driver .

Creates a copy of other .

This is an overloaded function.

Creates a PySide.QtSql.QSqlDatabase connection that uses the driver referred to by type . If the type is not recognized, the database connection will have no functionality.

The currently available driver types are:

Driver Type	Description
QDB2	IBM DB2
QIBASE	Borland InterBase Driver
QMYSQL	MySQL Driver
QOCI	Oracle Call Interface Driver
QODBC	ODBC Driver (includes Microsoft SQL Server)
QPSQL	PostgreSQL Driver
QSQLITE	SQLite version 3 or above
QSQLITE2	SQLite version 2
QTDS	Sybase Adaptive Server

Additional third party drivers, including your own custom drivers, can be loaded dynamically.

PySide.QtSql.QSqlDatabase.defaultConnection¶

static PySide.QtSql.QSqlDatabase.addDatabase(type[, connectionName=QLatin1String(defaultConnection)])¶

Parameters:	type – unicode connectionName – unicode
Return type:	`PySide.QtSql.QSqlDatabase`

Adds a database to the list of database connections using the driver type and the connection name connectionName . If there already exists a database connection called connectionName , that connection is removed.

The database connection is referred to by connectionName . The newly added database connection is returned.

If type is not available or could not be loaded, PySide.QtSql.QSqlDatabase.isValid() returns false.

If connectionName is not specified, the new connection becomes the default connection for the application, and subsequent calls to PySide.QtSql.QSqlDatabase.database() without the connection name argument will return the default connection. If a connectionName is provided here, use database(connectionName ) to retrieve the connection.

Warning

If you add a connection with the same name as an existing connection, the new connection replaces the old one. If you call this function more than once without specifying connectionName , the default connection will be the one replaced.

Before using the connection, it must be initialized. e.g., call some or all of PySide.QtSql.QSqlDatabase.setDatabaseName() , PySide.QtSql.QSqlDatabase.setUserName() , PySide.QtSql.QSqlDatabase.setPassword() , PySide.QtSql.QSqlDatabase.setHostName() , PySide.QtSql.QSqlDatabase.setPort() , and PySide.QtSql.QSqlDatabase.setConnectOptions() , and, finally, PySide.QtSql.QSqlDatabase.open() .

static PySide.QtSql.QSqlDatabase.addDatabase(driver[, connectionName=QLatin1String(defaultConnection)])

Parameters:	driver – `PySide.QtSql.QSqlDriver` connectionName – unicode
Return type:	`PySide.QtSql.QSqlDatabase`

This overload is useful when you want to create a database connection with a driver you instantiated yourself. It might be your own database driver, or you might just need to instantiate one of the Qt drivers yourself. If you do this, it is recommended that you include the driver code in your application. For example, you can create a PostgreSQL connection with your own QPSQL driver like this:

#include "qtdir/src/sql/drivers/psql/qsql_psql.cpp"

con = PQconnectdb("host=server user=bart password=simpson dbname=springfield")
drv = QPSQLDriver(con)
db = QSqlDatabase.addDatabase(drv) # becomes the new default connection
query = QSqlQuery()
query.exec_("SELECT NAME, ID FROM STAFF")
...

The above code sets up a PostgreSQL connection and instantiates a QPSQLDriver object. Next, PySide.QtSql.QSqlDatabase.addDatabase() is called to add the connection to the known connections so that it can be used by the Qt SQL classes. When a driver is instantiated with a connection handle (or set of handles), Qt assumes that you have already opened the database connection.

Note

We assume that qtdir is the directory where Qt is installed. This will pull in the code that is needed to use the PostgreSQL client library and to instantiate a QPSQLDriver object, assuming that you have the PostgreSQL headers somewhere in your include search path.

Remember that you must link your application against the database client library. Make sure the client library is in your linker’s search path, and add lines like these to your .pro file:

unix:LIBS += -lpq
win32:LIBS += libpqdll.lib

The method described works for all the supplied drivers. The only difference will be in the driver constructor arguments. Here is a table of the drivers included with Qt, their source code files, and their constructor arguments:

Driver	Class name	Constructor arguments	File to include
QPSQL	`QPSQLDriver`	PGconn *connection	`qsql_psql.cpp`
QMYSQL	`QMYSQLDriver`	MYSQL *connection	`qsql_mysql.cpp`
QOCI	`QOCIDriver`	OCIEnv environment, OCISvcCtx serviceContext	`qsql_oci.cpp`
QODBC	`QODBCDriver`	SQLHANDLE environment, SQLHANDLE connection	`qsql_odbc.cpp`
QDB2	QDB2	SQLHANDLE environment, SQLHANDLE connection	`qsql_db2.cpp`
QTDS	`QTDSDriver`	LOGINREC loginRecord, DBPROCESS dbProcess, const `PySide.QtCore.QString` &hostName	`qsql_tds.cpp`
QSQLITE	`QSQLiteDriver`	sqlite *connection	`qsql_sqlite.cpp`
QIBASE	`QIBaseDriver`	isc_db_handle connection	`qsql_ibase.cpp`

The host name (or service name) is needed when constructing the QTDSDriver for creating new connections for internal queries. This is to prevent blocking when several PySide.QtSql.QSqlQuery objects are used simultaneously.

Warning

Adding a database connection with the same connection name as an existing connection, causes the existing connection to be replaced by the new one.

Warning

The SQL framework takes ownership of the driver . It must not be deleted. To remove the connection, use PySide.QtSql.QSqlDatabase.removeDatabase() .

See also

PySide.QtSql.QSqlDatabase.drivers()

static PySide.QtSql.QSqlDatabase.cloneDatabase(other, connectionName)¶

Parameters:	other – `PySide.QtSql.QSqlDatabase` connectionName – unicode
Return type:	`PySide.QtSql.QSqlDatabase`

Clones the database connection other and and stores it as connectionName . All the settings from the original database, e.g. PySide.QtSql.QSqlDatabase.databaseName() , PySide.QtSql.QSqlDatabase.hostName() , etc., are copied across. Does nothing if other is an invalid database. Returns the newly created database connection.

Note

The new connection has not been opened. Before using the new connection, you must call PySide.QtSql.QSqlDatabase.open() .

PySide.QtSql.QSqlDatabase.close()¶

Closes the database connection, freeing any resources acquired, and invalidating any existing PySide.QtSql.QSqlQuery objects that are used with the database.

This will also affect copies of this PySide.QtSql.QSqlDatabase object.

PySide.QtSql.QSqlDatabase.commit()¶

Return type:	`PySide.QtCore.bool`

Commits a transaction to the database if the driver supports transactions and a PySide.QtSql.QSqlDatabase.transaction() has been started. Returns true if the operation succeeded. Otherwise it returns false .

Note

For some databases, the commit will fail and return false if there is an active query using the database for a SELECT . Make the query inactive before doing the commit.

Call PySide.QtSql.QSqlDatabase.lastError() to get information about errors.

PySide.QtSql.QSqlDatabase.connectOptions()¶

Return type:	unicode

Returns the connection options string used for this connection. The string may be empty.

PySide.QtSql.QSqlDatabase.connectionName()¶

Return type:	unicode

Returns the connection name, which may be empty. Note: The connection name is not the database name .

static PySide.QtSql.QSqlDatabase.connectionNames()¶

Return type:	list of strings

Returns a list containing the names of all connections.

static PySide.QtSql.QSqlDatabase.contains([connectionName=QLatin1String(defaultConnection)])¶

Parameters:	connectionName – unicode
Return type:	`PySide.QtCore.bool`

Returns true if the list of database connections contains connectionName ; otherwise returns false.

static PySide.QtSql.QSqlDatabase.database([connectionName=QLatin1String(defaultConnection)[, open=true]])¶

Parameters:	connectionName – unicode open – `PySide.QtCore.bool`
Return type:	`PySide.QtSql.QSqlDatabase`

Returns the database connection called connectionName . The database connection must have been previously added with PySide.QtSql.QSqlDatabase.addDatabase() . If open is true (the default) and the database connection is not already open it is opened now. If no connectionName is specified the default connection is used. If connectionName does not exist in the list of databases, an invalid connection is returned.

See also

PySide.QtSql.QSqlDatabase.isOpen() Threads and the SQL Module

PySide.QtSql.QSqlDatabase.databaseName()¶

Return type:	unicode

Returns the connection’s database name, which may be empty. Note: The database name is not the connection name.

PySide.QtSql.QSqlDatabase.driver()¶

Return type:	`PySide.QtSql.QSqlDriver`

Returns the database driver used to access the database connection.

PySide.QtSql.QSqlDatabase.driverName()¶

Return type:	unicode

Returns the connection’s driver name.

static PySide.QtSql.QSqlDatabase.drivers()¶

Return type:	list of strings

Returns a list of all the available database drivers.

PySide.QtSql.QSqlDatabase.exec_([query=""])¶

Parameters:	query – unicode
Return type:	`PySide.QtSql.QSqlQuery`

Executes a SQL statement on the database and returns a PySide.QtSql.QSqlQuery object. Use PySide.QtSql.QSqlDatabase.lastError() to retrieve error information. If query is empty, an empty, invalid query is returned and PySide.QtSql.QSqlDatabase.lastError() is not affected.

PySide.QtSql.QSqlDatabase.hostName()¶

Return type:	unicode

Returns the connection’s host name; it may be empty.

static PySide.QtSql.QSqlDatabase.isDriverAvailable(name)¶

Parameters:	name – unicode
Return type:	`PySide.QtCore.bool`

Returns true if a driver called name is available; otherwise returns false.

See also

PySide.QtSql.QSqlDatabase.drivers()

PySide.QtSql.QSqlDatabase.isOpen()¶

Return type:	`PySide.QtCore.bool`

Returns true if the database connection is currently open; otherwise returns false.

PySide.QtSql.QSqlDatabase.isOpenError()¶

Return type:	`PySide.QtCore.bool`

Returns true if there was an error opening the database connection; otherwise returns false. Error information can be retrieved using the PySide.QtSql.QSqlDatabase.lastError() function.

PySide.QtSql.QSqlDatabase.isValid()¶

Return type:	`PySide.QtCore.bool`

Returns true if the PySide.QtSql.QSqlDatabase has a valid driver.

Example:

db = QSqlDatabase()
print(db.isValid())         # Returns False

db = QSqlDatabase.database("sales")
print(db.isValid())         # Returns True if "sales" connection exists

QSqlDatabase.removeDatabase("sales")
print(db.isValid())         # Returns False

PySide.QtSql.QSqlDatabase.lastError()¶

Return type:	`PySide.QtSql.QSqlError`

Returns information about the last error that occurred on the database.

Failures that occur in conjunction with an individual query are reported by QSqlQuery.lastError() .

PySide.QtSql.QSqlDatabase.numericalPrecisionPolicy()¶

Return type:	`PySide.QtSql.QSql.NumericalPrecisionPolicy`

Returns the current default precision policy for the database connection.

PySide.QtSql.QSqlDatabase.open(user, password)¶

Parameters:	user – unicode password – unicode
Return type:	`PySide.QtCore.bool`

This is an overloaded function.

Opens the database connection using the given user name and password . Returns true on success; otherwise returns false. Error information can be retrieved using the PySide.QtSql.QSqlDatabase.lastError() function.

This function does not store the password it is given. Instead, the password is passed directly to the driver for opening the connection and it is then discarded.

See also

PySide.QtSql.QSqlDatabase.lastError()

PySide.QtSql.QSqlDatabase.open()

Return type:	`PySide.QtCore.bool`

Opens the database connection using the current connection values. Returns true on success; otherwise returns false. Error information can be retrieved using PySide.QtSql.QSqlDatabase.lastError() .

PySide.QtSql.QSqlDatabase.password()¶

Return type:	unicode

Returns the connection’s password. If the password was not set with PySide.QtSql.QSqlDatabase.setPassword() , and if the password was given in the PySide.QtSql.QSqlDatabase.open() call, or if no password was used, an empty string is returned.

PySide.QtSql.QSqlDatabase.port()¶

Return type:	`PySide.QtCore.int`

Returns the connection’s port number. The value is undefined if the port number has not been set.

See also

PySide.QtSql.QSqlDatabase.setPort()

PySide.QtSql.QSqlDatabase.primaryIndex(tablename)¶

Parameters:	tablename – unicode
Return type:	`PySide.QtSql.QSqlIndex`

Returns the primary index for table tablename . If no primary index exists an empty PySide.QtSql.QSqlIndex is returned.

PySide.QtSql.QSqlDatabase.record(tablename)¶

Parameters:	tablename – unicode
Return type:	`PySide.QtSql.QSqlRecord`

Returns a PySide.QtSql.QSqlRecord populated with the names of all the fields in the table (or view) called tablename . The order in which the fields appear in the record is undefined. If no such table (or view) exists, an empty record is returned.

static PySide.QtSql.QSqlDatabase.registerSqlDriver(name, creator)¶

Parameters:	name – unicode creator – `PySide.QtSql.QSqlDriverCreatorBase`

This function registers a new SQL driver called name , within the SQL framework. This is useful if you have a custom SQL driver and don’t want to compile it as a plugin.

Example:

class MyDatabaseDriverCreatorBase(QtSql.QSqlDriverCreatorBase):
    ...
    def createObject(self):
        return MyDatabaseDriver()

mydriver = MyDatabaseDriverCreatorBase()
QtSql.QSqlDatabase.registerSqlDriver("MYDRIVER", mydriver)
db = QtSql.QSqlDatabase.addDatabase("MYDRIVER")

PySide.QtSql.QSqlDatabase takes ownership of the creator pointer, so you mustn’t delete it yourself.

See also

PySide.QtSql.QSqlDatabase.drivers()

static PySide.QtSql.QSqlDatabase.removeDatabase(connectionName)¶

Parameters:	connectionName – unicode

Removes the database connection connectionName from the list of database connections.

Warning

There should be no open queries on the database connection when this function is called, otherwise a resource leak will occur.

Example:

# WRONG
db = QSqlDatabase.database("sales")
query = QSqlQuery("SELECT NAME, DOB FROM EMPLOYEES", db)
QSqlDatabase.removeDatabase("sales") # will output a warning

# "db" is now a dangling invalid database connection,
# "query" contains an invalid result set

The correct way to do it:

db = QSqlDatabase.database("sales")
query = QSqlQuery("SELECT NAME, DOB FROM EMPLOYEES", db)
# Both "db" and "query" are destroyed because they are out of scope
QSqlDatabase.removeDatabase("sales") # correct

To remove the default connection, which may have been created with a call to PySide.QtSql.QSqlDatabase.addDatabase() not specifying a connection name, you can retrieve the default connection name by calling PySide.QtSql.QSqlDatabase.connectionName() on the database returned by PySide.QtSql.QSqlDatabase.database() . Note that if a default database hasn’t been created an invalid database will be returned.

PySide.QtSql.QSqlDatabase.rollback()¶

Return type:	`PySide.QtCore.bool`

Rolls back a transaction on the database, if the driver supports transactions and a PySide.QtSql.QSqlDatabase.transaction() has been started. Returns true if the operation succeeded. Otherwise it returns false .

Note

For some databases, the rollback will fail and return false if there is an active query using the database for a SELECT . Make the query inactive before doing the rollback.

Call PySide.QtSql.QSqlDatabase.lastError() to get information about errors.

PySide.QtSql.QSqlDatabase.setConnectOptions([options=""])¶

Parameters:	options – unicode

Sets database-specific options . This must be done before the connection is opened or it has no effect (or you can PySide.QtSql.QSqlDatabase.close() the connection, call this function and PySide.QtSql.QSqlDatabase.open() the connection again).

The format of the options string is a semicolon separated list of option names or option=value pairs. The options depend on the database client used:

Examples:

...
# MySQL connection
db.setConnectOptions("CLIENT_SSL=1;CLIENT_IGNORE_SPACE=1") # use an SSL connection to the server
if not db.open():
    db.setConnectOptions() # clears the connect option string
    ...
...
# PostgreSQL connection
db.setConnectOptions("requiressl=1")    # enable PostgreSQL SSL connections
if not db.open():
    db.setConnectOptions() # clear options
    ...
...
# ODBC connection
# set ODBC options
db.setConnectOptions("SQL_ATTR_ACCESS_MODE=SQL_MODE_READ_ONLY;SQL_ATTR_TRACE=SQL_OPT_TRACE_ON")
if not db.open():
    db.setConnectOptions()              # don't try to set this option
    ...

Refer to the client library documentation for more information about the different options.

PySide.QtSql.QSqlDatabase.setDatabaseName(name)¶

Parameters:	name – unicode

Sets the connection’s database name to name . To have effect, the database name must be set before the connection is opened . Alternatively, you can PySide.QtSql.QSqlDatabase.close() the connection, set the database name, and call PySide.QtSql.QSqlDatabase.open() again. Note: The database name is not the connection name . The connection name must be passed to PySide.QtSql.QSqlDatabase.addDatabase() at connection object create time.

For the QOCI (Oracle) driver, the database name is the TNS Service Name.

For the QODBC driver, the name can either be a DSN, a DSN filename (in which case the file must have a .dsn extension), or a connection string.

For example, Microsoft Access users can use the following connection string to open an .mdb file directly, instead of having to create a DSN entry in the ODBC manager:

...
db = QSqlDatabase.addDatabase("QODBC")
db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=myaccessfile.mdb")
if db.open():
    # success!
    pass
...

There is no default value.

PySide.QtSql.QSqlDatabase.setHostName(host)¶

Parameters:	host – unicode

Sets the connection’s host name to host . To have effect, the host name must be set before the connection is opened . Alternatively, you can PySide.QtSql.QSqlDatabase.close() the connection, set the host name, and call PySide.QtSql.QSqlDatabase.open() again.

There is no default value.

PySide.QtSql.QSqlDatabase.setNumericalPrecisionPolicy(precisionPolicy)¶

Parameters:	precisionPolicy – `PySide.QtSql.QSql.NumericalPrecisionPolicy`

PySide.QtSql.QSqlDatabase.setPassword(password)¶

Parameters:	password – unicode

Sets the connection’s password to password . To have effect, the password must be set before the connection is opened . Alternatively, you can PySide.QtSql.QSqlDatabase.close() the connection, set the password, and call PySide.QtSql.QSqlDatabase.open() again.

There is no default value.

Warning

This function stores the password in plain text within Qt. Use the PySide.QtSql.QSqlDatabase.open() call that takes a password as parameter to avoid this behavior.

PySide.QtSql.QSqlDatabase.setPort(p)¶

Parameters:	p – `PySide.QtCore.int`

Sets the connection’s port number to port . To have effect, the port number must be set before the connection is opened . Alternatively, you can PySide.QtSql.QSqlDatabase.close() the connection, set the port number, and call PySide.QtSql.QSqlDatabase.open() again..

There is no default value.

PySide.QtSql.QSqlDatabase.setUserName(name)¶

Parameters:	name – unicode

Sets the connection’s user name to name . To have effect, the user name must be set before the connection is opened . Alternatively, you can PySide.QtSql.QSqlDatabase.close() the connection, set the user name, and call PySide.QtSql.QSqlDatabase.open() again.

There is no default value.

PySide.QtSql.QSqlDatabase.tables([type=QSql.Tables])¶

Parameters:	type – `PySide.QtSql.QSql.TableType`
Return type:	list of strings

PySide.QtSql.QSqlDatabase.transaction()¶

Return type:	`PySide.QtCore.bool`

Begins a transaction on the database if the driver supports transactions. Returns true if the operation succeeded. Otherwise it returns false .

PySide.QtSql.QSqlDatabase.userName()¶

Return type:	unicode

Returns the connection’s user name; it may be empty.

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