Question

如下面的代码所示，我想将表导出到“ secure_file_priv”中的位置，因为它只是我手动复制并粘贴它，但我希望能够使用它的值。

USE Library;


show VARIABLES LIKE 'secure_file_priv';

set mylocation := (VARIABLES LIKE 'secure_file_priv');

SELECT 'Id', 'Name', 'Birthplace', 'Birthday', 'Gender'
UNION ALL
SELECT Id, Name, Birthplace, Birthday, Gender
    FROM Author
    INTO OUTFILE '/var/lib/mysql-files/author.csv'
    FIELDS TERMINATED BY ',' 
    OPTIONALLY ENCLOSED BY ''
    LINES TERMINATED BY '\n';

我希望能够使用'secure_file_priv'变量的值，而不是手动编写'/var/lib/mysql-files/author.csv'。

Answer 1

SET @mylocation = (SELECT @@secure_file_priv);

SELECT 'Id', 'Name', 'Birthplace', 'Birthday', 'Gender'
UNION ALL
SELECT Id, Name, Birthplace, Birthday, Gender
    FROM Author
    INTO OUTFILE @mylocation
    FIELDS TERMINATED BY ',' 
    OPTIONALLY ENCLOSED BY ''
    LINES TERMINATED BY '\n';

如何在查询中使用变量值

1 个答案: