数据导入

语法说明：

LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE 'file_name'
    [REPLACE | IGNORE]
    INTO TABLE tbl_name
    [CHARACTER SET charset_name]
    [{FIELDS | COLUMNS}
        [TERMINATED BY 'string']
        [[OPTIONALLY] ENCLOSED BY 'char']
        [ESCAPED BY 'char']
    ]
    [LINES
        [STARTING BY 'string']
        [TERMINATED BY 'string']
    ]
    [IGNORE number {LINES | ROWS}]
    [(col_name_or_user_var,...)]
    [SET col_name = expr,...]

mysql默认是以一个tab键做为分隔符，而一般情况下我们习惯用|，所以可以这么来导入数据：

mysql> load data infile '~/test.txt' into table subscriber;
ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

咦，执行报错了，百度搜索错误信息，得知：导入导出数据必须在系统变量secure-file-priv指定的目录操作，如果变量为空，则不允许导入导出。把导入文件复制到要求的目录，重新导入成功：

mysql> show variables like 'secure%'
    -> ;
+------------------+-----------------------+
| Variable_name    | Value                 |
+------------------+-----------------------+
| secure_auth      | OFF                   |
| secure_file_priv | /var/lib/mysql-files/ |
+------------------+-----------------------+
2 rows in set (0.00 sec)

mysql> load data infile '/var/lib/mysql-files/test.txt' into table subscriber fields terminated by '|';
Query OK, 4 rows affected (0.06 sec)
Records: 4  Deleted: 0  Skipped: 0  Warnings: 0

数据导出

select * into outfile filename fields terminate by '|' from user;

mysql> select * into outfile '/var/lib/mysql-files/user.txt' fields terminated by '|' from user;
Query OK, 7 rows affected (0.00 sec)