QSqlIndex Class
The QSqlIndex class provides functions to manipulate and describe database indexes. More...
| Header: | #include <QSqlIndex> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS Sql) target_link_libraries(mytarget PRIVATE Qt6::Sql) |
| qmake: | QT += sql |
| Inherits: | QSqlRecord |
- List of all members, including inherited members
- QSqlIndex is part of Database Classes.
Public Functions
| QSqlIndex(const QString &cursorname = QString(), const QString &name = QString()) | |
| QSqlIndex(const QSqlIndex &other) | |
(since 6.6) | QSqlIndex(QSqlIndex &&other) |
| ~QSqlIndex() | |
| void | append(const QSqlField &field) |
| void | append(const QSqlField &field, bool desc) |
| QString | cursorName() const |
| bool | isDescending(int i) const |
| QString | name() const |
| void | setCursorName(const QString &cursorName) |
| void | setDescending(int i, bool desc) |
| void | setName(const QString &name) |
| QSqlIndex & | operator=(const QSqlIndex &other) |
(since 6.6) QSqlIndex & | operator=(QSqlIndex &&other) |
Detailed Description
An index refers to a single table or view in a database. Information about the fields that comprise the index can be used to generate SQL statements.
Member Function Documentation
[explicit] QSqlIndex::QSqlIndex(const QString &cursorname = QString(), const QString &name = QString())
Constructs an empty index using the cursor name cursorname and index name name.
QSqlIndex::QSqlIndex(const QSqlIndex &other)
Constructs a copy of other.
[noexcept, since 6.6] QSqlIndex::QSqlIndex(QSqlIndex &&other)
Move-constructs a new QSqlIndex from other.
Note: The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new value.
This function was introduced in Qt 6.6.
[noexcept] QSqlIndex::~QSqlIndex()
Destroys the object and frees any allocated resources.
void QSqlIndex::append(const QSqlField &field)
Appends the field field to the list of indexed fields. The field is appended with an ascending sort order.
void QSqlIndex::append(const QSqlField &field, bool desc)
This is an overloaded function.
Appends the field field to the list of indexed fields. The field is appended with an ascending sort order, unless desc is true.
QString QSqlIndex::cursorName() const
Returns the name of the cursor which the index is associated with.
See also setCursorName().
bool QSqlIndex::isDescending(int i) const
Returns true if field i in the index is sorted in descending order; otherwise returns false.
QString QSqlIndex::name() const
Returns the name of the index.
See also setName().
void QSqlIndex::setCursorName(const QString &cursorName)
Sets the name of the cursor that the index is associated with to cursorName.
See also cursorName().
void QSqlIndex::setDescending(int i, bool desc)
If desc is true, field i is sorted in descending order. Otherwise, field i is sorted in ascending order (the default). If the field does not exist, nothing happens.
See also isDescending().
void QSqlIndex::setName(const QString &name)
Sets the name of the index to name.
See also name().
QSqlIndex &QSqlIndex::operator=(const QSqlIndex &other)
Sets the index equal to other.
[noexcept, since 6.6] QSqlIndex &QSqlIndex::operator=(QSqlIndex &&other)
Move-assigns other to this QSqlIndex instance.
Note: The moved-from object other is placed in a partially-formed state, in which the only valid operations are destruction and assignment of a new value.
This function was introduced in Qt 6.6.