MySQL 中存储过程的 SELECT ... INTO OUTFILE 语句

Question

I need export one MySQL table in .csv format.

To do this I have tried this Stored Procedure using the SELECT ... INTO OUTFILE statement is intended to enable dumping a table to a csv file on the server host.

But I receive thsi error :

Procedure execution failed 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'C:\\inetpub\\ftproot\\tm_20200322.csv' at line 1

Can you help me ?

My code below.

BEGIN

  SET @tbl = DATE_FORMAT(DATE_SUB(CURDATE(),INTERVAL 1 DAY), '%Y%m%d');
  SET @s = CONCAT('C:\\inetpub\\ftproot\\\tm_', @tbl, '.csv');
  PREPARE stmt FROM @s;
  EXECUTE stmt;

  SET @s = CONCAT('SELECT * FROM `dotable` INTO OUTFILE @s FIELDS TERMINATED BY ";" LINES TERMINATED BY "\n"');
  PREPARE stmt FROM @s;
  EXECUTE stmt;

END

Answer 1

The file name must be enclosed with single quotes. Also, it is unclear why you would need to execute twice. You also need to carefuly use the escaping \\ (there are places where you have one to many, others where one is mising).

This should do what you want:

SET @tbl = DATE_FORMAT(DATE_SUB(CURDATE(),INTERVAL 1 DAY), '%Y%m%d');
SET @s = CONCAT('C:\\inetpub\\ftproot\\tm_', @tbl, '.csv');
SET @s = CONCAT('SELECT * FROM `dotable` INTO OUTFILE ''', @s, ''' FIELDS TERMINATED BY ";" LINES TERMINATED BY "\\n"');
PREPARE stmt FROM @s;
EXECUTE stmt;

This code generates the following query :

SELECT * FROM `dotable` INTO OUTFILE 'C:\inetpub\ftproot\tm_20200322.csv' FIELDS TERMINATED BY ";" LINES TERMINATED BY "\n"