Python - mysql 에서 CSV 데이터 가 져 오기 [학습 노트]

  
mysql> INSERT INTO test_main
    -> SELECT 1, 'A' UNION ALL
    -> SELECT 2, 'B' UNION ALL
    -> SELECT 3, 'C';
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0
 
mysql>
mysql> select id, value
    -> INTO OUTFILE 'f:/test_main.txt'
    -> FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY ''''
    -> LINES TERMINATED BY '
'
    -> FROM test_main;
Query OK, 3 rows affected (0.01 sec)
 
 
 
               
 
mysql> LOAD DATA INFILE 'f:/test_main.txt'
    -> INTO TABLE test_main6
    -> FIELDS TERMINATED BY ','
    -> OPTIONALLY ENCLOSED BY ''''
    -> (@dummy, value);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Deleted: 0  Skipped: 0  Warnings: 0
 
mysql> select * from test_main6;
+-------+
| value |
+-------+
| A     |
| B     |
| C     |
+-------+
3 rows in set (0.00 sec)
 
 
      ，        @dummy。
    ，       10 ，     2 ， 7   ，    
 
@dummy, 2,@dummy,@dummy,@dummy,@dummy, 7,@dummy,@dummy,@dummy

첫 번 째 부분 은 어떻게 처리 하 는 지, 데이터 파일 의 열 수, 표 의 수량 보다 많은 상황.

        ：
 
Book1.csv
 
 
  ,  ,  
1,    1,"  CSV   ,   "
2,    2,"  CSV    ""   """
3,    3,"  CSV   ,    ""   """
4,    4,    
 
 
mysql> CREATE TABLE Test_Book1 (
    ->   id    int,
    ->   name  VARCHAR(10),
    ->   data  VARCHAR(100)
    -> );
Query OK, 0 rows affected (0.05 sec)
 
 
    lines terminated by '\r
'         ,  windows   
    ignore 1 lines           。
mysql> LOAD DATA INFILE 'f:/Book1.csv'
    -> INTO TABLE Test_Book1
    -> FIELDS TERMINATED BY ','
    -> OPTIONALLY ENCLOSED BY '"'
    -> lines terminated by '\r
'
    -> ignore 1 lines
    -> (id, name, data);
Query OK, 4 rows affected (0.00 sec)
Records: 4  Deleted: 0  Skipped: 0  Warnings: 0
 
mysql> select * from test_book1;
+------+-----------+--------------------------------+
| id   | name      | data                           |
+------+-----------+--------------------------------+
|    1 |     1 |   CSV   ,              |
|    2 |     2 |   CSV    "   "        |
|    3 |     3 |   CSV   ,    "   " |
|    4 |     4 |                            |
+------+-----------+--------------------------------+
4 rows in set (0.00 sec)
 
 
 
    ，      
ignore 1 lines          。

두 번 째 부분 은 제목 열 을 어떻게 제거 하 는 지 설명 하 는 것 이다.