<分区>
Simple views are automatically updatable: the system will allow INSERT, UPDATE and DELETE statements to be used on the view in the same way as on a regular table.
然后它列出了一些要求。我相信我的 View 满足所有这些要求，但如果我尝试插入该 View ，我会收到错误消息:
psql:C355A12.txt:1702: ERROR: cannot insert into a view
HINT: You need an unconditional ON INSERT DO INSTEAD rule.
我要插入的 View 定义为:
CREATE VIEW locationsView
AS SELECT lc_name, lc_min, lc_max, lc_sizeX, lc_sizeY
FROM locations;
这是表定义:
CREATE TABLE locations(
lc_name LocationName NOT NULL,
lc_min LocationMin NOT NULL
DEFAULT 0,
lc_max LocationMax NOT NULL
DEFAULT 0,
lc_sizeX LocationSizeX NOT NULL,
lc_sizeY LocationSizeY NOT NULL,
PRIMARY KEY (lc_name)
);
使用的域是:
CREATE DOMAIN LocationName AS TEXT;
CREATE DOMAIN LocationMin AS INT;
CREATE DOMAIN LocationMax AS INT;
CREATE DOMAIN LocationSizeX As INT;
CREATE DOMAIN LocationSizeY As INT;
我如何获得文档描述的这种“自动更新”特性？
我使用的是 Postgres 版本 9.3.4。