The QSqlIndex class provides functions to manipulate and describe database indexes. 更多...
头: | #include <QSqlIndex> |
qmake: | QT += sql |
继承: | QSqlRecord |
QSqlIndex (const QSqlIndex & other ) | |
QSqlIndex (const QString & cursorname = QString(), const QString & name = QString()) | |
QSqlIndex & | operator= (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 ) |
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.
构造副本为 other .
Constructs an empty index using the cursor name cursorname and index name name .
Sets the index equal to other .
销毁对象并释放任何分配资源。
Appends the field field to the list of indexed fields. The field is appended with an ascending sort order.
这是重载函数。
Appends the field field to the list of indexed fields. The field is appended with an ascending sort order, unless desc 为 true。
Returns the name of the cursor which the index is associated with.
另请参阅 setCursorName ().
返回
true
if field
i
in the index is sorted in descending order; otherwise returns
false
.
Returns the name of the index.
另请参阅 setName ().
Sets the name of the cursor that the index is associated with to cursorName .
另请参阅 cursorName ().
若 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.
另请参阅 isDescending ().
Sets the name of the index to name .
另请参阅 name ().