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MySQL Study之--MySQL工具mysqlshow mmysqlshow客户可用来很快地查找存在哪些数据库，数据库中的表，表中的列或索 mysqlshow为一些SQL显示语句提供了一个命令行界面。相同的信息可以通过直接使用那些语句获得。例如，你可以从mysql客户程序发出它们。 象这样调用mysqlshow：shell> mysqlshow[选项] [db_name [tbl_name [col_name]]
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案例：
[root@mysrv mysql]# mysqlshow --help
mysqlshow Ver 9.10 Distrib 5.1.66, for redhat-linux-gnu (x86_64)
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Shows the structure of a MySQL database (databases, tables, and columns).
Usage: mysqlshow [OPTIONS] [database [table [column]]]
If last argument contains a shell or SQL wildcard (*,?,% or _) then only
what's matched by the wildcard is shown.
If no database is given then all matching databases are shown.
If no table is given, then all matching tables in database are shown.
If no column is given, then all matching columns and column types in table
are shown.
Default options are read from the following files in the given order:
/etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf
The following groups are read: mysqlshow client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit.
--no-defaults Don't read default options from any option file.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
-c, --character-sets-dir=name
Directory for character set files.
--default-character-set=name
Set the default character set.
--count Show number of rows per table (may be slow for non-MyISAM
tables).
-C, --compress Use compression in server/client protocol.
-#, --debug[=name] Output debug log. Often this is 'd:t:o,filename'.
--debug-check Check memory and open file usage at exit.
--debug-info Print some debug info at exit.
-?, --help Display this help and exit.
-h, --host=name Connect to host.
-i, --status Shows a lot of extra information about each table.
-k, --keys Show keys for table.
-p, --password[=name]
Password to use when connecting to server. If password is
not given, it's solicited on the tty.
-P, --port=# Port number to use for connection or 0 for default to, in
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/services, built-in default (3306).
--protocol=name The protocol to use for connection (tcp, socket, pipe,
memory).
-t, --show-table-type
Show table type column.
-S, --socket=name The socket file to use for connection.
--ssl Enable SSL for connection (automatically enabled with
other flags).Disable with --skip-ssl.
--ssl-ca=name CA file in PEM format (check OpenSSL docs, implies
--ssl).
--ssl-capath=name CA directory (check OpenSSL docs, implies --ssl).
--ssl-cert=name X509 cert in PEM format (implies --ssl).
--ssl-cipher=name SSL cipher to use (implies --ssl).
--ssl-key=name X509 key in PEM format (implies --ssl).
--ssl-verify-server-cert
Verify server's "Common Name" in its cert against
hostname used when connecting. This option is disabled by
default.
-u, --user=name User for login if not current user.
-v, --verbose More verbose output; you can use this multiple times to
get even more verbose output.
-V, --version Output version information and exit.
Variables (--variable-name=value)
and boolean options {FALSE|TRUE} Value (after reading options)
--------------------------------- -----------------------------
character-sets-dir (No default value)
default-character-set latin1
count FALSE
compress FALSE
debug-check FALSE
debug-info FALSE
host (No default value)
status FALSE
keys FALSE
port 3306
show-table-type FALSE
socket /tmp/mysql.sock
ssl FALSE
ssl-ca (No default value)
ssl-capath (No default value)
ssl-cert (No default value)
ssl-cipher (No default value)
ssl-key (No default value)
ssl-verify-server-cert FALSE
user (No default value)
1、不指定查看的database
[root@mysrv mysql]# mysqlshow -uroot -poracle
+--------------------+
| Databases |
+--------------------+
| information_schema |
| mysql |
| mysqlslap |
| performance_schema |
| prod |
| sakila |
| test |
+--------------------+
2、指定查看的database
[root@mysrv mysql]# mysqlshow -uroot -poracle mysql
Database: mysql
+---------------------------+
| Tables |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| general_log |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| host |
| innodb_index_stats |
| innodb_table_stats |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| servers |
| slave_master_info |
| slave_relay_log_info |
| slave_worker_info |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
[root@mysrv mysql]# mysqlshow -uroot -poracle prod
Database: prod
+--------+
| Tables |
+--------+
| t1 |
| t2 |
| t3 |
| t4 |
+--------+
3、查看指定
[root@mysrv mysql]# mysqlshow -uroot -poracle prod t1Database: prod Table: t1
+-------+-------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------+-------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
| id | int(11) | | NO | PRI | 0 | | select,insert,update,references | |
| name | varchar(10) | latin1_swedish_ci | YES | | | | select,insert,update,references | |
+-------+-------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
