QSql Namespace
The QSql namespace contains miscellaneous identifiers used throughout the Qt SQL module. More...
| Header: | #include <QSql> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS Sql)target_link_libraries(mytarget PRIVATE Qt6::Sql) |
| qmake: | QT += sql |
- QSql is part of Database Classes.
Types
| enum | Location { BeforeFirstRow, AfterLastRow } |
| enum | NumericalPrecisionPolicy { LowPrecisionInt32, LowPrecisionInt64, LowPrecisionDouble, HighPrecision } |
| flags | ParamType |
| enum | ParamTypeFlag { In, Out, InOut, Binary } |
| enum | TableType { Tables, SystemTables, Views, AllTables } |
See also Qt SQL.
Type Documentation
enum QSql::Location
This enum type describes special SQL navigation locations:
| Constant | Value | Description |
|---|---|---|
QSql::BeforeFirstRow | -1 | Before the first record. |
QSql::AfterLastRow | -2 | After the last record. |
See also QSqlQuery::at().
enum QSql::NumericalPrecisionPolicy
Numerical values in a database can have precisions greater than their corresponding C++ types. This enum lists the policies for representing such values in the application.
| Constant | Value | Description |
|---|---|---|
QSql::LowPrecisionInt32 | 0x01 | Force 32bit integer values. In case of floating point numbers, the fractional part is silently discarded. |
QSql::LowPrecisionInt64 | 0x02 | Force 64bit integer values. In case of floating point numbers, the fractional part is silently discarded. |
QSql::LowPrecisionDouble | 0x04 | Force double values. This is the default policy. |
QSql::HighPrecision | 0 | Strings will be used to preserve precision. |
Note: The actual behaviour if an overflow occurs is driver specific. The Oracle database just returns an error in this case.
enum QSql::ParamTypeFlag
flags QSql::ParamType
This enum is used to specify the type of a bind parameter.
| Constant | Value | Description |
|---|---|---|
QSql::In | 0x00000001 | The bind parameter is used to put data into the database. |
QSql::Out | 0x00000002 | The bind parameter is used to receive data from the database. |
QSql::InOut | In | Out | The bind parameter is used to put data into the database; it will be overwritten with output data on executing a query. |
QSql::Binary | 0x00000004 | This must be OR'd with one of the other flags if you want to indicate that the data being transferred is raw binary data. |
The ParamType type is a typedef for QFlags<ParamTypeFlag>. It stores an OR combination of ParamTypeFlag values.
enum QSql::TableType
This enum type describes types of SQL tables.
| Constant | Value | Description |
|---|---|---|
QSql::Tables | 0x01 | All the tables visible to the user. |
QSql::SystemTables | 0x02 | Internal tables used by the database. |
QSql::Views | 0x04 | All the views visible to the user. |
QSql::AllTables | 0xff | All of the above. |
© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.
