Question

我得到0 rows affected的输出有人可以告诉我为什么这个更新声明不起作用？

UPDATE 
  LEAGUE
SET
    [ALL_STAR] = '1'
  , [PLAYER] = 'ACTIVE'
  , [DATE] = GETDATE()
FROM 
    ASSOCIATION an 
    LEFT JOIN LEAGUE lg ON lg.[PLAYER_ID] = an.[PLAYER_ID] 
WHERE 
    lg.[ALL_STAR] IS NULL
    AND lg.[PLAYER] IS NULL
    AND lg.[DATE] IS NULL

Answer 1

尝试执行select语句以查看将受影响的记录。

我认为你所追求的是“NOT IN”声明。在测试时，您应该使用事务，这样您就可以在不更改任何记录的情况下进行回滚。

class ProductModel(QAbstractListModel):
    ManufacturerRole, ModelNumberRole, DescriptionRole = range(Qt.UserRole, Qt.UserRole + 3)

    def __init__(self, parent=None):
        QAbstractListModel.__init__(self, parent)
        self._products = []

    def addProduct(self, product):
        self.beginInsertRows(QModelIndex(), self.rowCount(), self.rowCount())
        self._products.append(product)
        self.endInsertRows()

    def removeProduct(self, model_number, manufacturer):
        selecteds = filter(lambda product: product['manufacturer'] == manufacturer and product["modelNumber"] == model_number, 
            self._products)
        for selected in selecteds:
            row = self._products.index(selected)
            self.beginRemoveRows(QModelIndex(), row, row)
            self._products.pop(row)
            self.endRemoveRows()

    def rowCount(self, parent=QModelIndex()):
        return len(self._products)

    def data(self, index, role=Qt.DisplayRole):
        if 0 <= index.row() < self.rowCount():
            product = self._products[index.row()]
            if role == ProductModel.ManufacturerRole:
                return product["manufacturer"]
            elif role == ProductModel.ModelNumberRole:
                return product["modelNumber"]
            elif role == ProductModel.DescriptionRole:
                return product["description"]
            elif role == Qt.DisplayRole:
                return "{} {} {}".format(*product.values())

class ProductCompler(QCompleter):
    def pathFromIndex(self, index):
        return index.data()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    le = QLineEdit()
    completer = ProductCompler(le)
    le.setCompleter(completer)
    model = ProductModel()
    completer.setModel(model)
    completer.setCompletionRole(ProductModel.ModelNumberRole)

    model.addProduct({"manufacturer": "StarTech", "modelNumber": "STANDOFF122", "description": "description"})
    model.addProduct({"manufacturer": "StarTrek", "modelNumber": "STANDOFF111", "description": "description"})
    model.addProduct({"manufacturer": "StackOverFlow", "modelNumber": "STANDOFF100", "description": "description"})
    model.addProduct({"manufacturer": "StarTech", "modelNumber": "ABCSTANDOFF122", "description": "description"})
    model.addProduct({"manufacturer": "StarTrek", "modelNumber": "ABCSTANDOFF111", "description": "description"})
    model.addProduct({"manufacturer": "StackOverFlow", "modelNumber": "DFSTANDOFF100", "description": "description"})

    model.removeProduct("STANDOFF111", "StarTrek")

    le.show()
    sys.exit(app.exec_())

UPDATE SET WITH JOIN错误

1 个答案: