Question

我必须从表的日期列中选择值2019-03-25，但格式如下：

2019-03-25T00:00:00.000+02:00

我能得到吗？

Oracle 10g

谢谢！

Answer 1

date数据类型不存储毫秒和时区信息，因此我理解了您的问题，即如何将date格式化为具有固定值的毫秒和时区的目标格式。

如果是这样，您可以像这样使用to_char()：

to_char(mycol, 'yyyy-mm-dd"T"hh24:mi:ss".000+2:00"')

Answer 2

您可以将class MyThread(QtCore.QThread): def __init__(self, scene): super().__init__() self.scene = scene def run(self): for item in self.scene.items(): # Render the ROI item to create a rasterized mask. qimage = self.qimage_from_shape_item(item) # do some stuff @staticmethod def qimage_from_shape_item(item: QtWidgets.QAbstractGraphicsShapeItem) -> QtGui.QImage: # Get items pen and brush to set back later. pen = item.pen() brush = item.brush() # Remove pen, set brush to white. item.setPen(QtGui.QPen(QtCore.Qt.NoPen)) item.setBrush(QtCore.Qt.white) # Determine the bounding box in pixel coordinates. top = int(item.scenePos().y() + item.boundingRect().top()) left = int(item.scenePos().x() + item.boundingRect().left()) bottom = int(item.scenePos().y() + item.boundingRect().bottom()) + 1 right = int(item.scenePos().x() + item.boundingRect().right()) + 1 size = QtCore.QSize(right - left, bottom - top) # Initialize qimage, use 8-bit grayscale. qimage = QtGui.QImage(size, QtGui.QImage.Format_Grayscale8) qimage.fill(QtCore.Qt.transparent) painter = QtGui.QPainter(qimage) painter.setRenderHint(QtGui.QPainter.Antialiasing) # Offset the painter to paint item in its correct pixel location. painter.translate(item.scenePos().x() - left, item.scenePos().y() - top) # Paint the item. item.paint(painter, QtWidgets.QStyleOptionGraphicsItem()) # Set the pen and brush back. item.setPen(pen) item.setBrush(brush) # Set the pixel coordinate offset of the item to the QImage. qimage.setOffset(QtCore.QPoint(left, top)) return qimage if __name__ == '__main__': app = QtWidgets.QApplication(sys.argv) widget = QtWidgets.QWidget() layout = QtWidgets.QVBoxLayout(widget) view = QtWidgets.QGraphicsView() layout.addWidget(view) scene = QtWidgets.QGraphicsScene() view.setScene(scene) thread = MyThread(scene) view.setFixedSize(400, 300) scene.setSceneRect(0, 0, 400, 300) rect_item = QtWidgets.QGraphicsRectItem() p = QtCore.QPointF(123.4, 56.78) rect_item.setPos(p) r = QtCore.QRectF(0., 0., 161.8, 100.) rect_item.setRect(r) scene.addItem(rect_item) button = QtWidgets.QPushButton("Get masks") layout.addWidget(button) button.clicked.connect(thread.start) widget.show() sys.exit(app.exec_()) CAST改成DATE，然后使用TIMESTAMP设置时区，然后使用FROM_TZ将其格式化为您的要求：

TO_CHAR

其中，为您的示例数据：

SELECT TO_CHAR(
         FROM_TZ( CAST( your_date AS TIMESTAMP ), '+02:00' ),
        'YYYY-MM-DD"T"HH24:MI:SS.FF3TZH:TZM'
       ) AS formatted_date
FROM   your_table;

输出：

| FORMATTED_DATE                |
| :---------------------------- |
| 2019-03-25T00:00:00.000+02:00 |

db <>提琴here

Answer 3

我们无法在db中存储时区信息，这就是为什么我们可以简单地使用以下格式的原因，

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UTC日期格式

3 个答案: