QSql Namespace▲
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Header: QSql
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Sql)
target_link_libraries(mytarget PRIVATE Qt6::Sql)
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qmake: QT += sql
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Group: QSql is part of Database Classes
Detailed Description▲
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▲
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. |
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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. |
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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.