使用兩個sql插入事務

Question

我有兩個sql插入操作（比如表A和B中的示例），它們在事務中，因爲我希望數據庫保持一致，即A中的元組必須具有引用在B.

在第二次插入我需要來自第一個ID，但我沒有得到這個ID，直到我對事務提交。
所以我卡住了。我不想將第一個插入從事務中移出，可能會發生第一個插入正常但第二個插入不正常，導致數據庫中的狀態不一致。

這種情況下的最佳做法是什麼？

編輯：這裏是代碼：

TransactionStatus txStatus = transactionManager.getTransaction(txDefinition); 
try{ 
    Integer aId = insertIntoA(); 
    insertIntoB(aId); 
}catch(){ 
    transactionManager.rollback(txStatus); 
    throw new CustomException(); 
} 
transactionManager.commit(txStatus); 

我想指出的是，我沒有得到援助直到我提交事務，因此將空到B.

Answer 1

什麼你在看什麼？您應該能夠通過序列（常見場景）（無論是）獲得（說）主鍵ID。你可以張貼一些代碼來澄清？

Answer 2

您第一次插入後，你可以做

SELECT @@IDENTITY 

爲了讓您剛插入的行的標識？

Answer 3

在MySQL中，insertIntoA你應該能夠做到：

SELECT LAST_INSERT_ID() 

...你用於插入，假設它是你正在尋找一個identity列值相同的連接。

編輯：如果你這樣做，它不工作（根據你的評論），我會看看中間層，看看發生了什麼。 MySQL與它很好：

mysql> create table A (id int(11) not null auto_increment, descr varchar(64), primary key (id)); 
Query OK, 0 rows affected (0.13 sec) 

mysql> create table B (fk int(11) not null, descr varchar(64)); 
Query OK, 0 rows affected (0.06 sec) 

mysql> start transaction; 
Query OK, 0 rows affected (0.00 sec) 

mysql> insert into A (descr) values ('Testing 1 2 3'); 
Query OK, 1 row affected (0.00 sec) 

mysql> select last_insert_id(); 
+------------------+ 
| last_insert_id() | 
+------------------+ 
|    1 | 
+------------------+ 
1 row in set (0.03 sec) 

mysql> insert into B (fk, descr) values (1, 'Test complete'); 
Query OK, 1 row affected (0.00 sec) 

mysql> commit; 
Query OK, 0 rows affected (0.03 sec) 

mysql> select * from A; 
+----+---------------+ 
| id | descr   | 
+----+---------------+ 
| 1 | Testing 1 2 3 | 
+----+---------------+ 
1 row in set (0.02 sec) 

mysql> select * from B; 
+----+---------------+ 
| fk | descr   | 
+----+---------------+ 
| 1 | Test complete | 
+----+---------------+ 
1 row in set (0.00 sec) 

mysql> start transaction; 
Query OK, 0 rows affected (0.00 sec) 

mysql> insert into A (descr) values ('Second test'); 
Query OK, 1 row affected (0.01 sec) 

mysql> select last_insert_id(); 
+------------------+ 
| last_insert_id() | 
+------------------+ 
|    2 | 
+------------------+ 
1 row in set (0.00 sec) 

mysql> insert into B (fk, descr) values (2, 'Second test complete'); 
Query OK, 1 row affected (0.00 sec) 

mysql> commit; 
Query OK, 0 rows affected (0.08 sec) 

mysql> select * from A; 
+----+---------------+ 
| id | descr   | 
+----+---------------+ 
| 1 | Testing 1 2 3 | 
| 2 | Second test | 
+----+---------------+ 
2 rows in set (0.02 sec) 

mysql> select * from B; 
+----+----------------------+ 
| fk | descr    | 
+----+----------------------+ 
| 1 | Test complete  | 
| 2 | Second test complete | 
+----+----------------------+ 
2 rows in set (0.00 sec) 

mysql> start transaction; 
Query OK, 0 rows affected (0.00 sec) 

mysql> insert into A (descr) values ('We''ll roll this one back.'); 
Query OK, 1 row affected (0.00 sec) 

mysql> select last_insert_id(); 
+------------------+ 
| last_insert_id() | 
+------------------+ 
|    3 | 
+------------------+ 
1 row in set (0.00 sec) 

mysql> insert into B (fk, descr) values (3, 'Won''t see this one.'); 
Query OK, 1 row affected (0.00 sec) 

mysql> select * from B; 
+----+----------------------+ 
| fk | descr    | 
+----+----------------------+ 
| 1 | Test complete  | 
| 2 | Second test complete | 
| 3 | Won't see this one. | 
+----+----------------------+ 
3 rows in set (0.00 sec) 

mysql> rollback; 
Query OK, 0 rows affected (0.03 sec) 

mysql> select * from A; 
+----+---------------+ 
| id | descr   | 
+----+---------------+ 
| 1 | Testing 1 2 3 | 
| 2 | Second test | 
+----+---------------+ 
2 rows in set (0.00 sec) 

mysql> select * from B; 
+----+----------------------+ 
| fk | descr    | 
+----+----------------------+ 
| 1 | Test complete  | 
| 2 | Second test complete | 
+----+----------------------+ 
2 rows in set (0.00 sec)