QSqlIndex Class▲
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Header: QSqlIndex
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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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Inherits: QSqlRecord
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Group: QSqlIndex is part of Database Classes
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.
[since 6.6] QSqlIndex::QSqlIndex(QSqlIndex &&other)▲
Move-constructs a new QSqlIndex from other.
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.
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▲
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▲
void QSqlIndex::setCursorName(const QString &cursorName)▲
Sets the name of the cursor that the index is associated with to cursorName.
See Also▲
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▲
See also isDescending()
void QSqlIndex::setName(const QString &name)▲
QSqlIndex &QSqlIndex::operator=(const QSqlIndex &other)▲
Sets the index equal to other.
[since 6.6] QSqlIndex &QSqlIndex::operator=(QSqlIndex &&other)▲
Move-assigns other to this QSqlIndex instance.
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.