QSqlIndex Class
The QSqlIndex class provides functions to manipulate and describe database indexes. 更多...
| 头文件: | #include <QSqlIndex> |
| qmake: | QT += sql |
| 基类: | QSqlRecord |
公有函数
| QSqlIndex(const QString &cursorname = QString(), const QString &name = QString()) | |
| QSqlIndex(const 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) |
- 29 个公有函数继承自 QSqlRecord
详细描述
The QSqlIndex class provides functions to manipulate and describe database indexes.
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.
成员函数
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.
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.
参见 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.
参见 setName().
void QSqlIndex::setCursorName(const QString &cursorName)
Sets the name of the cursor that the index is associated with to cursorName.
参见 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.
参见 isDescending().
void QSqlIndex::setName(const QString &name)
Sets the name of the index to name.
参见 name().
QSqlIndex &QSqlIndex::operator=(const QSqlIndex &other)
Sets the index equal to other.