178*_*024 5 mysql postgresql command-line-interface psql echo
我对以下事情感到沮丧:
0:33:1407402356:root@ahost:~# echo 'use wordpress_3_6_1; select * from wp_posts;'
| mysql -u mysqluser -pmysqlpasswdord | wc -l -L
42 40585
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SQL 查询结果被破坏得很丑陋。
PostgreSQLpsql提供了 helper 特性扩展模式。看看它在行动:
postgres@ahost:~$ echo '\c openerp7-0 \\ select * from pg_shadow' | psql
You are now connected to database "openerp7-0" as user "postgres".
usename | usesysid | usecreatedb | usesuper | usecatupd | userepl |
passwd | valuntil | useconfig
----------+----------+-------------+----------+-----------+---------+----------
-------------------------+----------+-----------
openerp | 16384 | t | t | t | t |
ahash | |
postgres | 10 | t | t | t | t |
anotherhash | |
(2 rows)
postgres@ahost:~$ echo '\c openerp7-0 \\ \x \\ select * from pg_shadow' |
psql
You are now connected to database "openerp7-0" as user "postgres".
Expanded display is on.
-[ RECORD 1 ]------------------------------------
usename | openerp
usesysid | 16384
usecreatedb | t
usesuper | t
usecatupd | t
userepl | t
passwd | ahash
valuntil |
useconfig |
-[ RECORD 2 ]------------------------------------
usename | postgres
usesysid | 10
usecreatedb | t
usesuper | t
usecatupd | t
userepl | t
passwd | anotherhash
valuntil |
useconfig |
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对于包含多列的表,这种扩展模式很可爱:
postgres@ahost:~$ echo '\c openerp7-0 \\ \x \\ select * from res_partner' |
psql | wc -l -L
223 44423
postgres@ahost:~$ echo '\c openerp7-0 \\ select * from res_partner' | psql |
wc -l -L
9 94030
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当然,那只是当人们不介意把排数弄乱的时候wc -l。
人们如何完成mysql类似于 中的扩展模式的功能psql?
小智 8
如果我正确理解您想要实现的目标,您可以尝试使用 \G 分隔符(而不是分号),如下所示:
echo 'SELECT * FROM mytable\G' | mysql -u myuser -p mypassword mydb
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示例输出:
*************************** 1. row ***************************
id: 1
locale: de
name: Afghanistan
*************************** 2. row ***************************
id: 2
locale: de
name: Ägypten
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