数据库的表备份与恢复

把数据导入到指定的文件：
table expression
into outfile \'filename\' <选项名称> |
into dumpfile \'filename\' |
into <user variable> <,....>
<选项名称>： fields [terminated by [literal] ] ....
	     lines terminated by <literal>	
as:
select *
from test
into outfile \'test.txt\'
把test 数据导入到 test.txt文件，在linux 下，test.txt和test表的存放位置相同
默认值中：
fields terminated by \'\t\'  
lines terminated by \'\n\'
enclosed by \'\'
escapsed by \'\\\'  
as:
select *
from test
into outfile \'test.txt\'
fields terminated by \',\'
lines terminated by \'?\'
表示导出的数据中，字段之间用 \',\'分隔，行之间用 \'?\'分隔

as:
select * 
from test
into outfile \'test.txt\'
fields terminated by \',\'
optionally enclosed by \'"\'
lines terminated by \'?\'
表示字符是用 \'"\'包围的，如果全部用\'"\'包围，则不用加上 optionally

也可用dumpfile,但是所有行彼此挨着，值与行之间没有任何标志
as:
select *
from test
into dumpfile \'test.dump\'

载入数据数据表中
load data [low_priority][concurrent][local]
infile \'filename\'
[replace]
into table tablename
[fields terminated by literal]
[lines terminated by literal]
as:
load data infile \'test.txt\'
replace
into table test;

as:
load data infile \'test.txt\'
replace
into table test
fields terminated by \',\'
line terminated by \'?\'