3.2.2　查看如何操作表（table_help命令）

table_help命令用于查看如何操作表。

语法：

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    table_help

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范例：查看有关操作表的命令和说明

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    hbase(main):002:0> table_help
Help for table-reference commands.
You can either create a table via 'create' and then manipulate the table via commands like 'put', 'get', etc.
See the standard help information for how to use each of these commands.
However, as of 0.96, you can also get a reference to a table, on which you can invoke commands.
For instance, you can get create a table and keep around a reference to it via:
hbase> t = create 't', 'cf'
Or, if you have already created the table, you can get a reference to it:
hbase> t = get_table 't'
You can do things like call 'put' on the table:
hbase> t.put 'r', 'cf:q', 'v'
which puts a row 'r' with column family 'cf', qualifier 'q' and value 'v' into table t.
To read the data out, you can scan the table:
hbase> t.scan
which will read all the rows in table 't'.
Essentially, any command that takes a table name can also be done via table reference.
Other commands include things like: get, delete, deleteall,
get_all_columns, get_counter, count, incr. These functions, along with
the standard JRuby object methods are also available via tab completion.
For more information on how to use each of these commands, you can also just type:
hbase> t.help 'scan
which will output more information on how to use that command.
You can also do general admin actions directly on a table; things like enable, disable,
flush and drop just by typing:
hbase> t.enable
hbase> t.flush
hbase> t.disable
hbase> t.drop
Note that after dropping a table, your reference to it becomes useless and further usage
is undefined (and not recommended).

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从上述信息可知，执行命令后返回了操作表的相关信息。