[英]Prevent overlapping values on CIDR column in PostgreSQL
Is there a constraint or some other PostgreSQL feature that prevents CIDR columns from having values that overlap? 是否有约束或其他一些PostgreSQL功能阻止CIDR列具有重叠的值?
For example: 例如:
192.168.1.0/24
and 192.168.1.1/32
192.168.1.0/24
和192.168.1.1/32
These could not exist together because 192.168.1.1/32
is contained in the 192.168.1.0/24
subnet. 这些不能一起存在,因为
192.168.1.1/32
包含在192.168.1.0/24
子网中。
Yes, that is easily done with an exclusion constraint. 是的,这可以通过排除约束轻松完成。
CREATE TABLE networks (
id integer GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
net cidr NOT NULL
);
ALTER TABLE networks ADD EXCLUDE USING gist (net inet_ops WITH &&);
INSERT INTO networks (net) VALUES ('192.168.1.0/24');
INSERT 0 1
INSERT INTO networks (net) VALUES ('192.168.1.1/32');
ERROR: conflicting key value violates exclusion constraint "networks_net_excl"
DETAIL: Key (net)=(192.168.1.1) conflicts with existing key (net)=(192.168.1.0/24).
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