Question

我有以下存储过程

DELIMITER ##
CREATE PROCEDURE exportFile()
BEGIN

Select * from Sample
INTO OUTFILE '~/Sample.csv'
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n';

END ##
DELIMITER ;

首次调用存储过程后，您将获得ERROR 1086 (HY000): File '~/Sample.csv' already exists - 理所当然。
我需要不断创建新文件。（即Sample1.csv，Sample2.csv，Sample3.csv ......等）每次通话。

问题：我该怎么做？

Answer 1

为什么不在文件中附加时间戳？

这是一个向文件追加时间戳的示例：

DELIMITER ##
CREATE PROCEDURE exportFile()
BEGIN

Select * from Sample
INTO OUTFILE CONCAT('~/Sample', CONCAT(DATE_FORMAT( your_date_field, '%d%m%Y') ,'.csv'))
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n';

END ##
DELIMITER ;

Answer 2

我达到了调试递归存储过程的类似要求。

这对我有用：

SET @s = CONCAT('SELECT * INTO OUTFILE ',"'", CONCAT('Result',FLOOR(1000+RAND()*9999)),'.txt',"'",' FROM TempTable112');
PREPARE stmt2 FROM @s;
EXECUTE stmt2;
DEALLOCATE PREPARE stmt2;

我使用xampp并在C：\ xampp \ mysql \ data \ myfolder获得输出。

MySQL如何不断创建输出的唯一文件？

2 个答案: