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mysqlshow 客户端对象查找工具，用来很快地查找存在哪些数据库、数据库中的表、表中的列或索引。和 mysql 客户端工具很类似，不过有些特性是 mysql 客户端工具所不具备的。
mysqlshow 的使用方法如下：
shell> mysqlshow[option] [db_name [tbl_name [col_name]]]
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如果不加任何选项，默认情况下，会显示所有数据库。下例中显示了当前 MySQL 中的所有数据库：
[zzx@localhost ~]$ mysqlshow -uroot +--------------------+ | Databases | +--------------------+ | information_schema | | backup | | data | | index | | mysql | | test | | test1 | +--------------------+
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下面是 mysqlshow 的一些常用选项。
如果不指定数据库，则显示每个数据库的名称、表数量、记录数量；如果指定数据库，则显示指定数据库的每个表名、字段数量，记录数量；如果指定具体数据库中的具体表，则显示表的字段信息，如下例所示。
（1）不指定数据库：
[zzx@localhost mysql]$ mysqlshow -uroot --count+--------------------+--------+--------------+ | Databases | Tables | Total Rows | +--------------------+--------+--------------+ | information_schema | 17 | 887 | | bak | 0 | 0 | | mysql | 18 | 1685 | | test | 6 | 522 | | test1 | 3 | 4 | +--------------------+--------+--------------+ 5 rows in set.
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（2）指定数据库：
[zzx@localhost mysql]$ mysqlshow -uroot test --count Database: test +--------+----------+------------+ | Tables | Columns | Total Rows | +--------+----------+------------+ | books2 | 3 | 1 | | dept | 2 | 512 | | emp | 3 | 5 | | emp1 | 3 | 3 | | t2 | 1 | 1 | | users2 | 2 | 0 | +--------+----------+------------+ 6 rows in set.
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（3）指定数据库和表：
[zzx@localhost mysql]$ mysqlshow -uroot test emp --count Database: test Table: emp Rows: 5 +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+ | Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment | +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+ | id | int(11) | | NO | PRI | 0 | | select,insert,update,references | | | name | varchar(200) | latin1_swedish_ci | YES | | | | select,insert,update,references | | | content | text | latin1_swedish_ci | YES | | | | select,insert,update,references | | +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+
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此选项显示了两部分内容，一部分是指定表的表结构，另外一部分是指定表的当前索引信息。下例中显示了 test 库中表 emp 的表结构和当前索引信息：
[zzx@localhost mysql]$ mysqlshow -uroot test emp -k Database: test Table: emp +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+ | Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment | +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+ | id | int(11) | | NO | PRI | 0 | | select,insert,update,references | | | name | varchar(200) | latin1_swedish_ci | YES | | | | select,insert,update,references | | | content | text | latin1_swedish_ci | YES | | | | select,insert,update,references | | +---------+--------------+-------------------+------+-----+---------+-------+---------------------------------+---------+ +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+ | emp | 0 | PRIMARY | 1 | id | A | 5 | | | | BTREE | | +-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
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细心的读者可能发现，显示的内容实际上和在 mysql 客户端执行“show full columns from emp” 和“show index from emp”的结果完全一致。
[zzx@localhost ~]$ mysql -uroot test -e 'show full columns from emp;show index from emp'
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下例中显示了 test 数据库中 emp 表的一些状态信息：
[zzx@localhost mysql]$ mysqlshow -uroot test emp -i Database: test Wildcard: emp +------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-------------------+----------+----------------+-----------------------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-------------------+----------+----------------+-----------------------+ | emp | InnoDB | 10 | Compact | 5 | 3276 | 16384 | 0 | 0 | 0 | | 2007-08-30 06:47:22 | | |latin1_swedish_ci | | | InnoDB free: 97280 kB | +------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-------------------+----------+----------------+-----------------------+
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此命令和 mysql 客户端执行“show table status from test like 'emp'”的结果完全一致。
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