MySQL通過自增一列在Select ... into outfile...裡面實現CSV匯出帶欄位的效果，outfile..csv

MySQL通過自增一列在Select ... into outfile...裡面實現CSV匯出帶欄位的效果，outfile..csv
CSV的範例中Select ... into outfile...是不帶欄位名的，只匯出資料，所以需要自己想另外的辦法實現，這裡有一個笨招，自己構造一個欄位列，樣本如下：

1，建立測試表資料
CREATE TABLE test.c SELECT 1 AS pid,1 AS item,15.0 AS wgt UNION ALL
SELECT 1 AS pid,2 AS item,20.0 AS wgt UNION ALL
SELECT 1 AS pid,3 AS item,30.0 AS wgt UNION ALL
SELECT 1 AS pid,4 AS item,29.0 AS wgt;
SELECT * FROM test.c;


mysql> SELECT * FROM test.c;
+-----+------+------+
| pid | item | wgt  |
+-----+------+------+
|   1 |    1 | 15.0 | 
|   1 |    2 | 20.0 | 
|   1 |    3 | 30.0 | 
|   1 |    4 | 29.0 | 
+-----+------+------+
4 ROWS IN SET (0.00 sec)


2，通過union all實現欄位列，並且排在第一行

SELECT * FROM (
SELECT 'pid' AS pid,'item' AS item,'wgt' AS wgt
UNION ALL
SELECT * FROM test.c
)a INTO OUTFILE '/tmp/c.csv' 
 FIELDS TERMINATED BY ',' 
 OPTIONALLY ENCLOSED BY '"'
  LINES TERMINATED BY '\n';

執行如下：
mysql> SELECT * FROM (
    -> SELECT 'pid' AS pid,'item' AS item,'wgt' AS wgt
    -> UNION ALL
    -> SELECT * FROM test.c
    -> )a INTO OUTFILE '/tmp/c.csv' 
    ->  FIELDS TERMINATED BY ',' 
    ->  OPTIONALLY ENCLOSED BY '"'
    ->   LINES TERMINATED BY '\n';
Query OK, 5 rows affected (0.00 sec)

3，去開啟c.csv檔案查看效果

mysql匯出csv

這樣就可以了：
select * from mysql表 into outfile 'csv表'