dos命令行连接PostgreSQL:
1. 接入PostgreSQL数据库: psql -h IP地址 -p 端口 -U 用户名 -d 数据库名 2. 输入数据库密码
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C:\Users\admin\Desktop λ psql -U postgres -d yiibai_db 用户 postgres 的口令: psql (11.1) 输入 "help" 来获取帮助信息. yiibai_db=# \dt 关联列表 架构模式 | 名称 | 类型 | 拥有者 ----------+----------+--------+---------- public | student | 数据表 | postgres public | student2 | 数据表 | postgres (2 行记录)
查看数据库:
1. SELECT datname FROM pg_database; 或者 2. psql命令行中执行:\l (反斜杠l)
例如:
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yiibai_db=# SElECT datname FROM pg_database; datname ----------- postgres template1 template0 yiibai_db (4 行记录) yiibai_db=# \l 数据库列表 名称 | 拥有者 | 字元编码 | 校对规则 | Ct ype | 存取权限 -----------+----------+----------+-----------------------------------------------------+-----------------------------------------------------+----------------------- postgres | postgres | UTF8 | Chinese (Simplified)_People's Republic of China.936 | Chinese (Simplified)_People's Republic of China.936 | template0 | postgres | UTF8 | Chinese (Simplified)_People's Republic of China.936 | Chinese (Simplified)_People's Republic of China.936 | =c/postgres + | | | | | postgres=CTc/postgres template1 | postgres | UTF8 | Chinese (Simplified)_People's Republic of China.936 | Chinese (Simplified)_People's Republic of China.936 | =c/postgres + | | | | | postgres=CTc/postgres yiibai_db | postgres | UTF8 | Chinese (Simplified)_People's Republic of China.936 | Chinese (Simplified)_People's Republic of China.936 | =Tc/postgres + | | | | | postgres=CTc/postgres (4 行记录) yiibai_db=#
切换数据库:
切换数据库:\c databasename
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yiibai_db=# SElECT datname FROM pg_database; datname ----------- postgres template1 template0 yiibai_db (4 行记录) yiibai_db=# \c postgres; 您现在已经连接到数据库 "postgres",用户 "postgres". postgres=#
查看当前数据库中的表:
1. SELECT tablename FROM pg_tables WHERE schemaname='public'; # 列出数据库中用户自定义的表名 或者 2. psql>\dt
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yiibai_db=# \dt 关联列表 架构模式 | 名称 | 类型 | 拥有者 ----------+----------+--------+---------- public | student | 数据表 | postgres public | student2 | 数据表 | postgres (2 行记录) yiibai_db=# SELECT tablename FROM yiibai_db; ERROR: relation "yiibai_db" does not exist 第1行SELECT tablename FROM yiibai_db; ^ yiibai_db=# SELECT tablename FROM pg_tables WHERE schemaname='public'; tablename ----------- student student2 (2 行记录)
查看库中某个表的结构:
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使用SQL去查询: SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar, a.attnotnull AS notnull, b.description AS comment FROM pg_class c, pg_attribute a LEFT OUTER JOIN pg_description b ON a.attrelid=b.objoid AND a.attnum = b.objsubid, pg_type t WHERE c.relname = 'student' and a.attnum > 0 and a.attrelid = c.oid and a.atttypid = t.oid ORDER BY a.attnum
使用命令查询 psql>\d tablename
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yiibai_db-# \d student 数据表 "public.student" 栏位 | 类型 | Collation | Nullable | Default ----------+----------------+-----------+----------+--------- name | character(100) | | | id | integer | | | subjects | character(1) | | |
显示数据的字符:\encoding
yiibai_db-# \encoding
GBK
yiibai_db-#