mysql的into outfile/load data infile可以用于数据的导入导出。
跟mysqldump不同的是，into outfile直接将数据输出到问题，数据本身是没有加密的，文件本身没有ddl建表语句，也没有insert语句。相当于将表数据导成csv表格文件
select .. into outfile语法：
SELECT
...
into_option: {
INTO OUTFILE 'file_name'
[CHARACTER SET charset_name]
export_options
| INTO DUMPFILE 'file_name'
| INTO var_name [, var_name] ...
}load data infile ..into table语法
LOAD DATA
[LOW_PRIORITY | CONCURRENT] [LOCAL]
INFILE 'file_name'
[REPLACE | IGNORE]
INTO TABLE tbl_name
[PARTITION (partition_name [, partition_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
[, col_name_or_user_var] ...)]
[SET col_name={expr | DEFAULT}
[, col_name={expr | DEFAULT}] ...]虽然语法选项很多，其中fields terminated by ',' enclosed by '`' lines terminated by '\r\n'是比较关键的
fields terminated by ',' 以 , 分割字段
enclosed by '`' 以 ` 围起字段，如果没有enclose可能导入时会遇到识别字段的问题，比如数据本身有,号，识别就错位了
lines terminated by '\r\n' \r\n为换行符， \r\n是linux的换行符，如果没有换行符导入数据可能只有1行
当然符号是自定义的，尽量使用数据中不太可能出现的字符
导出测试：
mysql> select * from lzldb.test1 into outfile '/tmp/lzldb_test1.txt' fields terminated by ',' enclosed by '`' lines terminated by '\r\n' ;
Query OK, 7 rows affected (0.01 sec)mysql> create table lzldb.test2 like lzldb.test1;
Query OK, 0 rows affected (0.02 sec)
mysql> load data infile '/tmp/lzldb_test1.txt' into table lzldb.test2 fields terminated by ',' enclosed by '`' lines terminated by '\r\n' ;
Query OK, 7 rows affected (0.00 sec)
Records: 7 Deleted: 0 Skipped: 0 Warnings: 0