Ibase Driver
2021年3月2日Download here: http://gg.gg/oieoo
The QSqlDatabase class handles a connection to a database. More...
*IBASE Transportation Solutions
*7th/6th Gen. Intel® Xeon® E3 / Core™ I7/i5/i3 ... - IBASE
*Ibase Drivers
*Qt Ibase DriverPublic Functions
IBM Security i2 iBase is an intuitive intelligence data management application that enables collaborative teams of analysts to capture, control and analyze multi-source data in security-rich workgroup environments. Below you can download the latest IBASE - Technoland bios upgrade for your motherboard after signup with the eSupport BIOSAgentPlus service.; You can identify your motherboard using the BIOS ID which is displayed on most computers at bootup.QSqlDatabase(const QSqlDatabase &other)QSqlDatabase() QSqlDatabase &operator=(const QSqlDatabase &other)~QSqlDatabase() void close() bool commit() QString connectOptions() const QString connectionName() const QString databaseName() const QSqlDriver *driver() const QString driverName() const QSqlQuery exec(const QString &query = QString()) const QString hostName() const bool isOpen() const bool isOpenError() const bool isValid() const QSqlError lastError() const QSql::NumericalPrecisionPolicy numericalPrecisionPolicy() const bool open() bool open(const QString &user, const QString &password) QString password() const int port() const QSqlIndex primaryIndex(const QString &tablename) const QSqlRecord record(const QString &tablename) const bool rollback() void setConnectOptions(const QString &options = QString()) void setDatabaseName(const QString &name) void setHostName(const QString &host) void setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy precisionPolicy) void setPassword(const QString &password) void setPort(int port) void setUserName(const QString &name) QStringList tables(QSql::TableType type = QSql::Tables) const bool transaction() QString userName() const
Supported drivers: db2 ibase mysql oci odbc psql sqlite all auto-sqlite. Select used sqlite3 system / qt. The configure script cannot detect the necessary libraries and include files if they are not in the standard paths, so it may be necessary to specify these paths using the.INCDIR=,.LIBDIR=, or.PREFIX= command-line. Depending on their requirements, customers can choose the models based on performance, number of displays (up to twelve/12 for video wall player), resolution and ventilation designs. IBASE digital signage players feature advanced remote management that easily refreshes content and increases uptime while lowering costs. SP-63E SW-101-N. Automated and task driven analysis Uncover hidden connections faster and help analysts deliver timely and actionable results. Search 360 Comprehensively searches intelligence stored in records, charts and documents through a straightforward internet style search bar.Static Public Members QSqlDatabase addDatabase(const QString &type, const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase addDatabase(QSqlDriver *driver, const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase cloneDatabase(const QSqlDatabase &other, const QString &connectionName) QSqlDatabase cloneDatabase(const QString &other, const QString &connectionName) QStringList connectionNames() bool contains(const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase database(const QString &connectionName = QLatin1String(defaultConnection), bool open = true) QStringList drivers() bool isDriverAvailable(const QString &name) void registerSqlDriver(const QString &name, QSqlDriverCreatorBase *creator) void removeDatabase(const QString &connectionName)Protected FunctionsQSqlDatabase(QSqlDriver *driver)QSqlDatabase(const QString &type)Detailed Description
The QSqlDatabase class provides an interface for accessing a database through a connection. An instance of QSqlDatabase represents the connection. The connection provides access to the database via one of the supported database drivers, which are derived from QSqlDriver. Alternatively, you can subclass your own database driver from QSqlDriver. See How to Write Your Own Database Driver for more information.
Create a connection (i.e., an instance of QSqlDatabase) by calling one of the static addDatabase() functions, where you specify the driver or type of driver to use (depending on the type of database) 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. 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 addDatabase(). Subsequently, the default connection will be assumed if you call any static member function without specifying the connection name. The following snippet shows how to create and open a default connection to a PostgreSQL database:
Once the QSqlDatabase object has been created, set the connection parameters with setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions(). Then call 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 addDatabase(). Subsequently, you can get the default connection by calling database() without the connection name argument:
QSqlDatabase is a value class. Changes made to a database connection via one instance of QSqlDatabase will affect other instances of QSqlDatabase that represent the same connection. Use cloneDatabase() to create an independent database connection based on an existing one.
Warning: It is highly recommended that you do not keep a copy of the QSqlDatabase around as a member of a class, as this will prevent the instance from being correctly cleaned up on shutdown. If you need to access an existing QSqlDatabase, it should be accessed with database(). If you chose to have a QSqlDatabase member variable, this needs to be deleted before the QCoreApplication instance is deleted, otherwise it may lead to undefined behavior.
If you create multiple database connections, specify a unique connection name for each one, when you call addDatabase(). Use database() with a connection name to get that connection. Use removeDatabase() with a connection name to remove a connection. QSqlDatabase outputs a warning if you try to remove a connection referenced by other QSqlDatabase objects. Use contains() to see if a given connection name is in the list of connections.Some utility methods:tables()returns the list of tablesprimaryIndex()returns a table’s primary indexrecord()returns meta-information about a table’s fieldstransaction()starts a transactioncommit()saves and completes a transactionrollback()cancels a transactionhasFeature()checks if a driver supports transactionslastError()returns information about the last errordrivers()returns the names of the available SQL driversisDriverAvailable()checks if a particular driver is availableregisterSqlDriver()registers a custom-made driver
Note: QSqlDatabase::exec() is deprecated. Use QSqlQuery::exec() instead.
Note: When using transactions, you must start the transaction before you create your query.
See also QSqlDriver, QSqlQuery, Qt SQL, and Threads and the SQL Module.Member Function Documentation[protected] QSqlDatabase::QSqlDatabase(QSqlDriver *driver)
This is an overloaded function.
Creates a database connection using the given driver.[protected] QSqlDatabase::QSqlDatabase(const QString &type)
This is an overloaded function.
Creates a 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 TypeDescriptionQDB2IBM DB2QIBASEBorland InterBase DriverQMYSQLMySQL DriverQOCIOracle Call Interface DriverQODBCODBC Driver (includes Microsoft SQL Server)QPSQLPostgreSQL DriverQSQLITESQLite version 3 or aboveQSQLITE2SQLite version 2QTDSSybase Adaptive Server
Additional third party drivers, including your own custom drivers, can be loaded dynamically.
See also SQL Database Drivers, registerSqlDriver(), and drivers().QSqlDatabase::QSqlDatabase(const QSqlDatabase &other)
Creates a copy of other.QSqlDatabase::QSqlDatabase()
Creates an empty, invalid QSqlDatabase object. Use addDatabase(), removeDatabase(), and database() to get valid QSqlDatabase objects.QSqlDatabase &QSqlDatabase::operator=(const QSqlDatabase &other)
Assigns other to this object.QSqlDatabase::~QSqlDatabase()
Destroys the object and frees any allocated resources.
Note: When the last connection is destroyed, the destructor implicitly calls close() to release the database connection.
See also close().[static] QSqlDatabase QSqlDatabase::addDatabase(const QString &type, const QString &connectionName = QLatin1String(defaultConnection))
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, isValid() returns false.
If connectionName is not specified, the new connection becomes the default connection for the application, and subsequent calls to 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 setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions(), and, finally, open().
Note: This function is thread-safe.
See also database(), removeDatabase(), and Threads and the SQL Module.[static] QSqlDatabase QSqlDatabase::addDatabase(QSqlDriver *driver, const QString &connectionName = QLatin1String(defaultConnection))
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:
The above code sets up a PostgreSQL connection and instantiates a QPSQLDriver object. Next, 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:
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:DriverClass nameConstructor argumentsFile to includeQPSQLQPSQLDriverPGconn *connectionqsql_psql.cppQMYSQLQMYSQLDriverMYSQL *connectionqsql_mysql.cppQOCIQOCIDriverOCIEnv *environment, OCISvcCtx *serviceContextqsql_oci.cppQODBCQODBCDriverSQLHANDLE environment, SQLHANDLE connectionqsql_odbc.cppQDB2QDB2SQLHANDLE environment, SQLHANDLE connectionqsql_db2.cppQTDSQTDSDriverLOGINREC *loginRecord, DBPROCESS *dbProcess, const QString &hostNameqsql_tds.cppQSQLITEQSQLiteDriversqlite *connectionqsql_sqlite.cppQIBASEQIBaseDriverisc_db_handle connectionqsql_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 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 removeDatabase().
See also drivers().[static] QSqlDatabase QSqlDatabase::cloneDatabase(const QSqlDatabase &other, const QString &connectionName)
Clones the database connection other and stores it as connectionName. All the settings from the original database, e.g. databaseName(), 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 open().[static] QSqlDatabase QSqlDatabase::cloneDatabase(const QString &other, const QString &connectionName)
This is an overloaded function.
Clones the database connection other and stores it as connectionName. All the settings from the original database, e.g. databaseName(), 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 open().
This overload is useful when cloning the database in another thread to the one that is used by the database represented by other.
This function was introduced in Qt 5.13.void QSqlDatabase::close()
Closes the database connection, freeing any resources acquired, and invalidating any existing QSqlQuery objects that are used with the database.
This will also affect copies of this QSqlDatabase object.
See also removeDatabase().bool QSqlDatabase::commit()
Commits a transaction to the database if the driver supports transactions and a 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 lastError() to get information about errors.
See also QSqlQuery::isActive(), QSqlDriver::hasFeature(), and rollback().QString QSqlDatabase::connectOptions() const
Returns the connection options string used for this connection. The string may be empty.
See also setConnectOptions().QString QSqlDatabase::connectionName() const
Returns the connection name, which may be empty.
Note: The connection name is not the database name.
This function was introduced in Qt 4.4.
See also addDatabase().[static] QStringList QSqlDatabase::connectionNames()
Returns a list containing the names of all connections.
Note: This function is thread-safe.
See also contains(), database(), and Threads and the SQL Module.[static] bool QSqlDatabase::contains(const QString &connectionName = QLatin1String(defaultConnection))
Returns true if the list of database connections contains connectionName; otherwise returns false.
Note: This function is thread-safe.
See also connectionNames(), database(), and Threads and the SQL Module.[static] QSqlDatabase QSqlDatabase::database(const QString &connectionName = QLatin1String(defaultConnection), boolopen = true)
Returns the database connection called connectionName. The database connection must have been previously added with 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.
Note: This function is thread-safe.
See also isOpen() and Threads and the SQL Module.QString QSqlDatabase::databaseName() const
Returns the connection’s database name, which may be empty.
Note: The database name is not the connection name.
See also setDatabaseName().QSqlDriver *QSqlDatabase::driver() const
Returns the database driver used to access the database connection.
See also addDatabase() and drivers().QString QSqlDatabase::driverName() const
Returns the connection’s driver name.
See also addDatabase() and driver().[static] QStringList QSqlDatabase::drivers()
Returns a list of all the available database drivers.
See also registerSqlDriver().QSqlQuery QSqlDatabase::exec(const QString &query = QString()) const
Executes a SQL statement on the database and returns a QSqlQuery object. Use lastError() to retrieve error information. If query is empty, an empty, invalid query is returned and lastError() is not affected.
See also QSqlQuery and lastError().QString QSqlDatabase::hostName() const
Returns the connection’s host name; it may be empty.
See also setHostName().[static] bool QSqlDatabase::isDriverAvailable(const QString &name)
Returns true if a driver called name is available; otherwise returns false.
See also drivers().bool QSqlDatabase::isOpen() const
Returns true if the database connection is currently open; otherwise returns false.bool QSqlDatabase::isOpenError() const
Returns true if there was an error opening the database connection; otherwise returns false. Error information can be retrieved using the lastError() function.bool QSqlDatabase::isValid() const
Returns true if the QSqlDatabase has a valid driver.
Example:QSqlError QSqlDatabase::lastError() const
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().
See also QSqlError and QSqlQuery::lastError().QSql::NumericalPrecisionPolicy QSqlDatabase::numericalPrecisionPolicy() const
Returns the current default precision policy for the database connection.
This function was introduced in Qt 4.6.
See also QSql::NumericalPrecisionPolicy, setNumericalPrecisionPolicy(), QSqlQuery::numericalPrecisionPolicy(), and QSqlQuery::setNumericalPrecisionPolicy().bool QSqlDatabase::open()
Opens the database connection using the current connection values. Returns true on success; otherwise returns false. Error information can be retrieved using lastError().
See also lastError(), setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions().bool QSqlDatabase::open(const QString &user, const QString
https://diarynote.indered.space
The QSqlDatabase class handles a connection to a database. More...
*IBASE Transportation Solutions
*7th/6th Gen. Intel® Xeon® E3 / Core™ I7/i5/i3 ... - IBASE
*Ibase Drivers
*Qt Ibase DriverPublic Functions
IBM Security i2 iBase is an intuitive intelligence data management application that enables collaborative teams of analysts to capture, control and analyze multi-source data in security-rich workgroup environments. Below you can download the latest IBASE - Technoland bios upgrade for your motherboard after signup with the eSupport BIOSAgentPlus service.; You can identify your motherboard using the BIOS ID which is displayed on most computers at bootup.QSqlDatabase(const QSqlDatabase &other)QSqlDatabase() QSqlDatabase &operator=(const QSqlDatabase &other)~QSqlDatabase() void close() bool commit() QString connectOptions() const QString connectionName() const QString databaseName() const QSqlDriver *driver() const QString driverName() const QSqlQuery exec(const QString &query = QString()) const QString hostName() const bool isOpen() const bool isOpenError() const bool isValid() const QSqlError lastError() const QSql::NumericalPrecisionPolicy numericalPrecisionPolicy() const bool open() bool open(const QString &user, const QString &password) QString password() const int port() const QSqlIndex primaryIndex(const QString &tablename) const QSqlRecord record(const QString &tablename) const bool rollback() void setConnectOptions(const QString &options = QString()) void setDatabaseName(const QString &name) void setHostName(const QString &host) void setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy precisionPolicy) void setPassword(const QString &password) void setPort(int port) void setUserName(const QString &name) QStringList tables(QSql::TableType type = QSql::Tables) const bool transaction() QString userName() const
Supported drivers: db2 ibase mysql oci odbc psql sqlite all auto-sqlite. Select used sqlite3 system / qt. The configure script cannot detect the necessary libraries and include files if they are not in the standard paths, so it may be necessary to specify these paths using the.INCDIR=,.LIBDIR=, or.PREFIX= command-line. Depending on their requirements, customers can choose the models based on performance, number of displays (up to twelve/12 for video wall player), resolution and ventilation designs. IBASE digital signage players feature advanced remote management that easily refreshes content and increases uptime while lowering costs. SP-63E SW-101-N. Automated and task driven analysis Uncover hidden connections faster and help analysts deliver timely and actionable results. Search 360 Comprehensively searches intelligence stored in records, charts and documents through a straightforward internet style search bar.Static Public Members QSqlDatabase addDatabase(const QString &type, const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase addDatabase(QSqlDriver *driver, const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase cloneDatabase(const QSqlDatabase &other, const QString &connectionName) QSqlDatabase cloneDatabase(const QString &other, const QString &connectionName) QStringList connectionNames() bool contains(const QString &connectionName = QLatin1String(defaultConnection)) QSqlDatabase database(const QString &connectionName = QLatin1String(defaultConnection), bool open = true) QStringList drivers() bool isDriverAvailable(const QString &name) void registerSqlDriver(const QString &name, QSqlDriverCreatorBase *creator) void removeDatabase(const QString &connectionName)Protected FunctionsQSqlDatabase(QSqlDriver *driver)QSqlDatabase(const QString &type)Detailed Description
The QSqlDatabase class provides an interface for accessing a database through a connection. An instance of QSqlDatabase represents the connection. The connection provides access to the database via one of the supported database drivers, which are derived from QSqlDriver. Alternatively, you can subclass your own database driver from QSqlDriver. See How to Write Your Own Database Driver for more information.
Create a connection (i.e., an instance of QSqlDatabase) by calling one of the static addDatabase() functions, where you specify the driver or type of driver to use (depending on the type of database) 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. 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 addDatabase(). Subsequently, the default connection will be assumed if you call any static member function without specifying the connection name. The following snippet shows how to create and open a default connection to a PostgreSQL database:
Once the QSqlDatabase object has been created, set the connection parameters with setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions(). Then call 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 addDatabase(). Subsequently, you can get the default connection by calling database() without the connection name argument:
QSqlDatabase is a value class. Changes made to a database connection via one instance of QSqlDatabase will affect other instances of QSqlDatabase that represent the same connection. Use cloneDatabase() to create an independent database connection based on an existing one.
Warning: It is highly recommended that you do not keep a copy of the QSqlDatabase around as a member of a class, as this will prevent the instance from being correctly cleaned up on shutdown. If you need to access an existing QSqlDatabase, it should be accessed with database(). If you chose to have a QSqlDatabase member variable, this needs to be deleted before the QCoreApplication instance is deleted, otherwise it may lead to undefined behavior.
If you create multiple database connections, specify a unique connection name for each one, when you call addDatabase(). Use database() with a connection name to get that connection. Use removeDatabase() with a connection name to remove a connection. QSqlDatabase outputs a warning if you try to remove a connection referenced by other QSqlDatabase objects. Use contains() to see if a given connection name is in the list of connections.Some utility methods:tables()returns the list of tablesprimaryIndex()returns a table’s primary indexrecord()returns meta-information about a table’s fieldstransaction()starts a transactioncommit()saves and completes a transactionrollback()cancels a transactionhasFeature()checks if a driver supports transactionslastError()returns information about the last errordrivers()returns the names of the available SQL driversisDriverAvailable()checks if a particular driver is availableregisterSqlDriver()registers a custom-made driver
Note: QSqlDatabase::exec() is deprecated. Use QSqlQuery::exec() instead.
Note: When using transactions, you must start the transaction before you create your query.
See also QSqlDriver, QSqlQuery, Qt SQL, and Threads and the SQL Module.Member Function Documentation[protected] QSqlDatabase::QSqlDatabase(QSqlDriver *driver)
This is an overloaded function.
Creates a database connection using the given driver.[protected] QSqlDatabase::QSqlDatabase(const QString &type)
This is an overloaded function.
Creates a 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 TypeDescriptionQDB2IBM DB2QIBASEBorland InterBase DriverQMYSQLMySQL DriverQOCIOracle Call Interface DriverQODBCODBC Driver (includes Microsoft SQL Server)QPSQLPostgreSQL DriverQSQLITESQLite version 3 or aboveQSQLITE2SQLite version 2QTDSSybase Adaptive Server
Additional third party drivers, including your own custom drivers, can be loaded dynamically.
See also SQL Database Drivers, registerSqlDriver(), and drivers().QSqlDatabase::QSqlDatabase(const QSqlDatabase &other)
Creates a copy of other.QSqlDatabase::QSqlDatabase()
Creates an empty, invalid QSqlDatabase object. Use addDatabase(), removeDatabase(), and database() to get valid QSqlDatabase objects.QSqlDatabase &QSqlDatabase::operator=(const QSqlDatabase &other)
Assigns other to this object.QSqlDatabase::~QSqlDatabase()
Destroys the object and frees any allocated resources.
Note: When the last connection is destroyed, the destructor implicitly calls close() to release the database connection.
See also close().[static] QSqlDatabase QSqlDatabase::addDatabase(const QString &type, const QString &connectionName = QLatin1String(defaultConnection))
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, isValid() returns false.
If connectionName is not specified, the new connection becomes the default connection for the application, and subsequent calls to 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 setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions(), and, finally, open().
Note: This function is thread-safe.
See also database(), removeDatabase(), and Threads and the SQL Module.[static] QSqlDatabase QSqlDatabase::addDatabase(QSqlDriver *driver, const QString &connectionName = QLatin1String(defaultConnection))
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:
The above code sets up a PostgreSQL connection and instantiates a QPSQLDriver object. Next, 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:
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:DriverClass nameConstructor argumentsFile to includeQPSQLQPSQLDriverPGconn *connectionqsql_psql.cppQMYSQLQMYSQLDriverMYSQL *connectionqsql_mysql.cppQOCIQOCIDriverOCIEnv *environment, OCISvcCtx *serviceContextqsql_oci.cppQODBCQODBCDriverSQLHANDLE environment, SQLHANDLE connectionqsql_odbc.cppQDB2QDB2SQLHANDLE environment, SQLHANDLE connectionqsql_db2.cppQTDSQTDSDriverLOGINREC *loginRecord, DBPROCESS *dbProcess, const QString &hostNameqsql_tds.cppQSQLITEQSQLiteDriversqlite *connectionqsql_sqlite.cppQIBASEQIBaseDriverisc_db_handle connectionqsql_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 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 removeDatabase().
See also drivers().[static] QSqlDatabase QSqlDatabase::cloneDatabase(const QSqlDatabase &other, const QString &connectionName)
Clones the database connection other and stores it as connectionName. All the settings from the original database, e.g. databaseName(), 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 open().[static] QSqlDatabase QSqlDatabase::cloneDatabase(const QString &other, const QString &connectionName)
This is an overloaded function.
Clones the database connection other and stores it as connectionName. All the settings from the original database, e.g. databaseName(), 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 open().
This overload is useful when cloning the database in another thread to the one that is used by the database represented by other.
This function was introduced in Qt 5.13.void QSqlDatabase::close()
Closes the database connection, freeing any resources acquired, and invalidating any existing QSqlQuery objects that are used with the database.
This will also affect copies of this QSqlDatabase object.
See also removeDatabase().bool QSqlDatabase::commit()
Commits a transaction to the database if the driver supports transactions and a 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 lastError() to get information about errors.
See also QSqlQuery::isActive(), QSqlDriver::hasFeature(), and rollback().QString QSqlDatabase::connectOptions() const
Returns the connection options string used for this connection. The string may be empty.
See also setConnectOptions().QString QSqlDatabase::connectionName() const
Returns the connection name, which may be empty.
Note: The connection name is not the database name.
This function was introduced in Qt 4.4.
See also addDatabase().[static] QStringList QSqlDatabase::connectionNames()
Returns a list containing the names of all connections.
Note: This function is thread-safe.
See also contains(), database(), and Threads and the SQL Module.[static] bool QSqlDatabase::contains(const QString &connectionName = QLatin1String(defaultConnection))
Returns true if the list of database connections contains connectionName; otherwise returns false.
Note: This function is thread-safe.
See also connectionNames(), database(), and Threads and the SQL Module.[static] QSqlDatabase QSqlDatabase::database(const QString &connectionName = QLatin1String(defaultConnection), boolopen = true)
Returns the database connection called connectionName. The database connection must have been previously added with 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.
Note: This function is thread-safe.
See also isOpen() and Threads and the SQL Module.QString QSqlDatabase::databaseName() const
Returns the connection’s database name, which may be empty.
Note: The database name is not the connection name.
See also setDatabaseName().QSqlDriver *QSqlDatabase::driver() const
Returns the database driver used to access the database connection.
See also addDatabase() and drivers().QString QSqlDatabase::driverName() const
Returns the connection’s driver name.
See also addDatabase() and driver().[static] QStringList QSqlDatabase::drivers()
Returns a list of all the available database drivers.
See also registerSqlDriver().QSqlQuery QSqlDatabase::exec(const QString &query = QString()) const
Executes a SQL statement on the database and returns a QSqlQuery object. Use lastError() to retrieve error information. If query is empty, an empty, invalid query is returned and lastError() is not affected.
See also QSqlQuery and lastError().QString QSqlDatabase::hostName() const
Returns the connection’s host name; it may be empty.
See also setHostName().[static] bool QSqlDatabase::isDriverAvailable(const QString &name)
Returns true if a driver called name is available; otherwise returns false.
See also drivers().bool QSqlDatabase::isOpen() const
Returns true if the database connection is currently open; otherwise returns false.bool QSqlDatabase::isOpenError() const
Returns true if there was an error opening the database connection; otherwise returns false. Error information can be retrieved using the lastError() function.bool QSqlDatabase::isValid() const
Returns true if the QSqlDatabase has a valid driver.
Example:QSqlError QSqlDatabase::lastError() const
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().
See also QSqlError and QSqlQuery::lastError().QSql::NumericalPrecisionPolicy QSqlDatabase::numericalPrecisionPolicy() const
Returns the current default precision policy for the database connection.
This function was introduced in Qt 4.6.
See also QSql::NumericalPrecisionPolicy, setNumericalPrecisionPolicy(), QSqlQuery::numericalPrecisionPolicy(), and QSqlQuery::setNumericalPrecisionPolicy().bool QSqlDatabase::open()
Opens the database connection using the current connection values. Returns true on success; otherwise returns false. Error information can be retrieved using lastError().
See also lastError(), setDatabaseName(), setUserName(), setPassword(), setHostName(), setPort(), and setConnectOptions().bool QSqlDatabase::open(const QString &user, const QString
https://diarynote.indered.space
コメント