Options :
[FIELDS [TERMINATED BY ‘string’] [ENCLOSED BY ‘string’] [LENGTH] [ESCAPED BY ] [DOUBLE_ENCLOSED BY] ] [LINES [TERMINATED BY ‘string’] [ STARTING BY ] ] [CHARACTER SET charset_name] [NULL_VALUE 'string'] [OUTFILEMODE BY] [WRITEMODE BY] [FILECOUNT ] [FILESIZE] [WITH HEAD]
l [FIELDS [TERMINATED BY ‘string’] [ [OPTIONALLY] ENCLOSED BY‘单字符’] [DOUBLE_ENCLOSED BY] [LENGTH] [ESCAPED BY ] ]
• TERMINATED BY：字段分隔符，支持多个字符，如果不指定分隔符则默认值“\t”，即TAB键。
• ENCLOSED BY：字段包围符，可以自行指定单个字符为字段包围符，指定多个字符时报错。支持 OPTIONALLY选项，加OPTIONALLY选项时仅对字符串类型起作用，否则对所有字段都起作用。默认为无 字段包围符。
• DOUBLE_ENCLOSED BY：字段包围符自转义，该参数包含上面参数（字段包围符）的所有功能；但额外 的作用是，当转义符为空时，如果某字段满足使用字段包围符的条件，且该字段中还有与字段包围符相同 的字符，则将该字符通过双写的方式自转义。
• LENGTH：在使用定长模式导出时，用于设定字段长度的参数。定长格式数据导出时，设置每个字段的长 度，多个字段之间用逗号分隔，该参数不能和列分隔符以及包围符混用。
• ESCAPED BY ：转义标识符，可以自行指定单个字符为转义标识符，指定多个字符时报错，默认为”\”,默 认值在语句中写为：FIELDS ESCAPED BY '\\'。
示例1： select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' optionally ENCLOSED BY '\'' WRITEMODE BY overwrites;
导出数据：
库内数据：
示例2： select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' ENCLOSED BY '\'' WRITEMODE BY overwrites;
示例3 ： select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' optionally
DOUBLE_ENCLOSED BY '\'' WRITEMODE BY overwrites FIELDS ESCAPED BY'';
导出数据：
库内数据： 
示例4：ENCLOSED BY
select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' optionally ENCLOSED
BY '\'' WRITEMODE BY overwrites FIELDS ESCAPED BY'';
示例5： select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' optionally ENCLOSED BY '''' WRITEMODE BY overwrites FIELDS ESCAPED BY '';
导出数据：
库内数据：
示例6： select * from test into outfile '/home/gbase/xyz' FIELDS TERMINATED BY '|' optionally ENCLOSED BY '''' WRITEMODE BY overwrites FIELDS ESCAPED BY'\'';
导出数据：
示例7： select * from test into outfile '/home/gbase/fixlen' FIELDS TERMINATED BY '' ENCLOSED BY '' WRITEMODE BY overwrites;
导出数据：
库内数据：
示例8： select * from test into outfile '/home/gbase/fixlen' WRITEMODE BY overwrites;
导出数据：
示例9： gbase> select * from test into outfile '/home/gbase/fixlen' fields length '5,50' WRITEMODE BY overwrites; 错误信息： ERROR 1149 (42000): Invalid length field, need length 11 for field 'a'.
示例10： select * from test into outfile '/home/gbase/fixlen' fields length '11,2' WRITEMODE BY overwrites;
导出数据： 
库内数据：
