CODEWITHSUNDEEP
mysqlcsvexport-to-csv
user2700690
user2700690

Reputation: 563

How to handle null field when exporting MYSQL tables to CSV

Right now when I export MYSQL tables to CSV files, I'm getting \N for NULL fields in the database which is expected. If there a way to change the \N output to just an empty string when exporting tables to csv?

Thanks

SELECT 'CU_CustomerID','CU_UserName','CU_Password','CU_Email','CU_Company','CU_Comment','CU_LastBasket','CON_FirstName','CON_MiddleI','CON_LastName','CON_Address1','CON_Address2','CON_City','CON_State','CON_Province','CON_Country','CON_Zip','CON_Phone1','CON_Phone2'
UNION
SELECT T1.CU_CustomerID,T1.CU_UserName,T1.CU_Password,T1.CU_Email,T1.CU_Company,T1.CU_Comment,T1.CU_ShopperPoints,T2.CON_FirstName,T2.CON_MiddleI,T2.CON_LastName,T2.CON_Address1,T2.CON_Address2,T2.CON_City,T2.CON_State,T2.CON_Province,T2.CON_Country,T2.CON_Zip,T2.CON_Phone1,T2.CON_Phone2
FROM CUSTOMERS AS T1
INNER JOIN CONTACT AS T2 ON T1.CU_CustomerID = T2.CON_CustomerID
WHERE T1.CU_CustomerID BETWEEN 0 AND 1000
INTO OUTFILE  'customers.csv'
FIELDS TERMINATED BY  ','
ENCLOSED BY  '"'

Upvotes: 19

Views: 25481

Answers (4)

Jomadee
Jomadee

Reputation: 43

I also had this problem, solved as follows:

select ifnull(`addr`.`reference`, "") AS `reference`, data2 from ...

Upvotes: 3

Dallas Clarke
Dallas Clarke

Reputation: 269

The hardway:-

SELECT 'CU_CustomerID','CU_UserName','CU_Password','CU_Email','CU_Company','CU_Comment','CU_LastBasket','CON_FirstName','CON_MiddleI','CON_LastName','CON_Address1','CON_Address2','CON_City','CON_State','CON_Province','CON_Country','CON_Zip','CON_Phone1','CON_Phone2'
UNION
SELECT COALESCE(T1.CU_CustomerID,''),COALESCE(T1.CU_UserName,''),COALESCE(T1.CU_Password,''),COALESCE(T1.CU_Email,''),COALESCE(T1.CU_Company,''),COALESCE(T1.CU_Comment,''),COALESCE(T1.CU_ShopperPoints,''),COALESCE(T2.CON_FirstName,''),COALESCE(T2.CON_MiddleI,''),COALESCE(T2.CON_LastName,''),COALESCE(T2.CON_Address1,''),COALESCE(T2.CON_Address2,''),COALESCE(T2.CON_City,''),COALESCE(T2.CON_State,''),COALESCE(T2.CON_Province,''),COALESCE(T2.CON_Country,''),COALESCE(T2.CON_Zip,''),COALESCE(T2.CON_Phone1,''),COALESCE(T2.CON_Phone2,'')
FROM CUSTOMERS AS T1
INNER JOIN CONTACT AS T2 ON T1.CU_CustomerID = T2.CON_CustomerID
WHERE T1.CU_CustomerID BETWEEN 0 AND 1000
INTO OUTFILE  'customers.csv'
FIELDS TERMINATED BY  ','
ENCLOSED BY  '"'

This will default all values to an empty string rather than NULL ('\N').

Upvotes: 4

Rustam Guliev
Rustam Guliev

Reputation: 954

Just in case. To avoid typing "ifnull(var,'') as var" for every single variable one can use this:

SELECT GROUP_CONCAT(CONCAT("IFNULL(",COLUMN_NAME,",'') AS ", COLUMN_NAME))
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '<table name>'
AND TABLE_SCHEMA = '<schema name>'
ORDER BY ORDINAL_POSITION

Upvotes: 3

Jens
Jens

Reputation: 69505

From MySQL documentation

If the FIELDS ESCAPED BY character is empty, no characters are escaped and NULL is output as NULL, not \N. It is probably not a good idea to specify an empty escape character, particularly if field values in your data contain any of the characters in the list just given.

Upvotes: 16

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