postgresql中网络地址类型和布尔类型
创建测试用户，表空间，以及数据库，赋予权限
postgres=# create role pguser with encrypted password 'pguser'; CREATE ROLE postgres=# create tablespace tbs_mydb owner pguser location '/data/10/tbs_mydb'; CREATE TABLESPACE ^ postgres=# create database mydb with owner=pguser template=template0 encoding='UTF8' tablespace=tbs_mydb; CREATE DATABASE postgres=# grant all on database mydb to pguser with grant option; GRANT postgres=# grant all on tablespace tbs_mydb to pguser; GRANT postgres=# alter role pguser login; ALTER ROLE 1.布尔类型
字符类型名称 存储长度 描述
boolean 1byte 值为TRUE或者FALSE，0,1,yes,no,t,f,y,n
mydb=> create table test_bool(a boolean,b boolean); CREATE TABLE mydb=> insert into test_bool values('true','false'); INSERT 0 1 mydb=> select * from test_bool; a | b ---+--- t | f (1 row) mydb=> insert into test_bool values('y','n'); INSERT 0 1 mydb=> select * from test_bool; a | b ---+--- t | f t | f (2 rows) mydb=> insert into test_bool values('t','f'); INSERT 0 1 mydb=> select * from test_bool; a | b ---+--- t | f t | f t | f (3 rows) mydb=> insert into test_bool values('1','0'); INSERT 0 1 mydb=> select * from test_bool; a | b ---+--- t | f t | f t | f t | f (4 rows) HINT: You will need to rewrite or cast the expression. mydb=> insert into test_bool values(null,null); INSERT 0 1 HINT: You will need to rewrite or cast the expression. mydb=> select * from test_bool;注意插入null之后，是由数据，只不过数据值为空 a | b ---+--- t | f t | f t | f t | f | (5 rows) 2.网络地址类型
字符类型名称 存储长度 描述
cidr 7/19字节 IPV4/IPV6网络
inet 7/19字节 IPV4/IPV6网络
macaddr 7/19字节 MAC地址
macaddr8 7/19字节 MAC地址(EUI-64格式)
inet和cidr类型存储格式为IP地址/掩码，如果掩码省略，则IPV4掩码为32，IPV6掩码为128
mydb=> create table test_ipaddres(a cidr,b inet); CREATE TABLE mydb=> mydb=> \d+ test_ipaddres Table public.test_ipaddres Column | Type | Collation | Nullable | Default | Storage | Stats target | Description --------+------+-----------+----------+---------+---------+--------------+------------- a | cidr | | | | main | | b | inet | | | | main | | mydb=> insert into test_ipaddres values ('192.168.1.10/32','192.168.1.10/16'); INSERT 0 1 mydb=> mydb=> select * from test_ipaddres mydb-> ; a | b -----------------+----------------- 192.168.1.10/32 | 192.168.1.10/16 **inet和cidr类型的数据都会对数据进行是否合法的检查** mydb=> select '192.168.1.300'::cidr; ERROR: invalid input syntax for type cidr: 192.168.1.300 LINE 1: select '192.168.1.300'::cidr; ^ mydb=> select '192.168.1.300'::inet; ERROR: invalid input syntax for type inet: 192.168.1.300 LINE 1: select '192.168.1.300'::inet; ^ mydb=> **cidr会默认输出掩码信息，inet不会输出掩码信息** mydb=> select '192.168.1.100'::inet; inet --------------- 192.168.1.100 (1 row) mydb=> select '192.168.1.100'::cidr; cidr ------------------ 192.168.1.100/32 (1 row) mydb=> **cidr会对IP和掩码进行合法性检查，inet不会** mydb=> select '192.168.1.100/24'::inet; inet ------------------ 192.168.1.100/24 (1 row) mydb=> mydb=> mydb=> select '192.168.1.100/24'::cidr; ERROR: invalid cidr value: 192.168.1.100/24 LINE 1: select '192.168.1.100/24'::cidr; ^ DETAIL: Value has bits set to right of mask. mydb=> 取IP值 mydb=> select host(cidr '192.168.1.232/32'); host --------------- 192.168.1.232 (1 row) 取IP和掩码 mydb=> select text(cidr '192.168.1.232/32'); text ------------------ 192.168.1.232/32 (1 row) 取子网掩码 mydb=> select netmask(cidr '192.168.1.232/32'); netmask ----------------- 255.255.255.255 (1 row)