Question

我的第一个问题是VIEW模式实际上用于什么？目的是什么？如果在链接到VIEW的表中添加，删除或更改了某些内容，结果是否会自动更新？

这是我关于一些代码的问题：

我在这里使用此代码创建了一个VIEW TABLE：

json

Id喜欢在其中插入名为{this.state.safetyData.map((item, key) => { if (item.no_images) { // HERE: add this check return( <View> {item.no_images.map((image,key) => { return( <View> <Text>{JSON.stringify(image.id)}</Text> </View> )} )} </View> ) } )}的新列，并为每个可用行粘贴一个数字CREATE VIEW innerb_comma AS SELECT CONCAT(Pcode, ',') AS Pcode, CONCAT(Brand, ',') AS Brand, CONCAT(descr, ',') AS descr, CONCAT(Size, ',') AS Size, Barcode AS Barcode FROM innerb WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode) AND Pcode like '%102';。

Answer 1

您可以在下面尝试-只需在选择列表中添加1作为数量

CREATE VIEW innerb_comma AS
SELECT CONCAT(Pcode, ',') AS Pcode,
       CONCAT(Brand, ',') AS Brand,
       CONCAT(descr, ',') AS descr,
       CONCAT(Size, ',') AS Size,
       Barcode AS Barcode, 1 as quantity
FROM innerb
WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode) 
  AND Pcode like '%102'

为VIEW表创建一个列，并为所有行粘贴值“ 1”

1 个答案: