１ 簡介
工作中產品經常會臨時找我導出一些數據，導出mysql查詢結果數據有幾種方法，下面介紹３種．
① mysql -u -p -e "sql" db > filepath
② echo "sql" | login > filepath
③ mysql login; use db; select * into outfile "filepath" from tb condition;
２ 實例講解
① mysql -uroot -p123456 -e "select * from tb_user where id = 1" testdb > ~/wbwcachedata/tb_user.txt
mysql -uroot -p123456 -e "select * from tb_user where id = 1" testdb > ~/wbwcachedata/tb_user.csv
mysql -uroot -p123456 -e "select * from tb_user where id = 1" testdb > ~/wbwcachedata/tb_user.xls
個人比較喜歡導出爲csv，因爲xls經常會出現幾個字段合到了一列的情況．導出csv之後，以製表符tab爲分隔點即可轉成excel．
另外如果出現中文亂碼，可直接用命令轉碼 iconv -futf8 -tgb2312 -otb_user.xls tb_user1.xls．或者直接用文件軟件轉碼即可（excel轉ANSI碼）．
② echo "select * from tb_user where id = 1" | mysql -uroot -p123456 > ~/wbwcachedata/mysqlexport0327-01.csv
錯誤提示： ERROR 1046 (3D000) at line 1: No database selected
沒關係，我們在sql中加上use db即可:
echo "use testdb; select * from tb_user where id = 1;" | mysql -uroot -p123456 > ~/wbwcachedata/mysqlexport0327-01.csv
③ 登錄mysql
mysql -uroot -p
執行sql
select * into outfile '~/wbwcachedata/mysqlexport0327-02.csv' from tb_user where id = 1;
錯誤提示： ERROR 1046 (3D000): No database selected
記得選擇數據庫
use testdb;
select * into outfile '~/wbwcachedata/mysqlexport0327-02.csv' from tb_user where id = 1;
錯誤提示： ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
此時有兩種解決辦法，第一種是改mysql的my.ini的secure-file-priv路徑重啓mysql．
第二種是
執行 show variables like '%secure%';
返回
+--------------------------+-----------------------+
| Variable_name | Value |
+--------------------------+-----------------------+
| require_secure_transport | OFF |
| secure_auth | ON |
| secure_file_priv | /var/lib/mysql-files/ |
+--------------------------+-----------------------+
發現mysql允許導出路徑爲/var/lib/mysql-files/
我們執行sql
select * into outfile '/var/lib/mysql-files/mysqlexport0327-02.csv' from tb_user where id = 1;
然後用cp/mv命令把該文件轉移到我們想要的路徑．
一般我是選第二種，在沒必要的情況下，不應主動修改my.ini．