QSqlRelation ¶

概要 ¶

详细描述 ¶

QSqlRelation is a helper class for QSqlRelationalTableModel 。见 setRelation() and relation() 了解细节。

另请参阅

QSqlRelationalTableModel QSqlRelationalDelegate Relational Table Model Example

class QSqlRelation ¶

QSqlRelation(QSqlRelation)

QSqlRelation(aTableName, indexCol, displayCol)

param QSqlRelation

QSqlRelation

param aTableName

unicode

param indexCol

unicode

param displayCol

unicode

Constructs an invalid QSqlRelation 对象。

For such an object, the tableName() , indexColumn() ，和 displayColumn() functions return an empty string.

另请参阅

isValid()

构造 QSqlRelation object, where tableName is the SQL table name to which a foreign key refers, indexColumn is the foreign key, and displayColumn is the field that should be presented to the user.

另请参阅

tableName() indexColumn() displayColumn()

PySide2.QtSql.QSqlRelation. displayColumn ( ) ¶

返回类型

unicode

Returns the column from table tableName() that should be presented to the user instead of a foreign key.

PySide2.QtSql.QSqlRelation. indexColumn ( ) ¶

返回类型

unicode

Returns the index column from table tableName() to which a foreign key refers.

PySide2.QtSql.QSqlRelation. isValid ( ) ¶

返回类型

bool

返回 true 若 QSqlRelation object is valid; otherwise returns false .

PySide2.QtSql.QSqlRelation. swap ( other ) ¶

参数

other – QSqlRelation

交换 this with other .

PySide2.QtSql.QSqlRelation. tableName ( ) ¶

返回类型

unicode

Returns the name of the table to which a foreign key refers.