Question

我有一个很长的事务，我已经开始使用BEGIN，我在最后一行之前的3行犯了一个错误。有没有办法使该行无效？

以下是一个例子：

BEGIN TRANSACTION;
CREATE TABLE purchase(id integer PRIMARY KEY, purchasePrice integer CHECK(purchasePrice>0), customer text);
INSERT INTO purchase(purchasePrice, customer) VALUES(1200, "Jerome");
INSERT INTO purchase(purchasePrice, customer) VALUES(200, "Jeffery");
INSERT INTO purchase(purchasePrice, customer) VALUES(40, "Craig");
INSERT INTO purchase(purchasePrice, customer) VALUES(1640, "Donovan");
INSERT INTO purchase(purchasePrice, customer) VALUES(100, "Williams");
INSERT INTO purchase(purchasePrice, customer) VALUES(50, "Matsushi");
INSERT INTO purchase(purchasePrice, customer) VALUES(150, "Xhao");
INSERT INTO purchase(purchasePrice, customer) VALUES(250, "Dilberta");
INSERT INTO purchase(purchasePrice, customer) VALUES(840, "Brow"); //Supposed to be 9440,"Brown"
INSERT INTO purchase(purchasePrice, customer) VALUES(440, "DarkBrown");
INSERT INTO purchase(purchasePrice, customer) VALUES(20, "Black");
COMMIT;

我明白我以后可以更新受影响的行。

另一个例子情况：

BEGIN TRANSACTION;
CREATE TABLE Movies(MId integer primary key autoincrement, Title text);
INSERT INTO Movies VALUES(1,'Capote');
INSERT INTO Movies VALUES(2,'Scent of a woman');
INSERT INTO Movies VALUES(3,'Stigmata');
INSERT INTO Movies VALUES(4,'Exorcist');
INSERT INTO Movies VALUES(5,'Hamsun');
//Changed my mind and want to name the table "movie" and  name the columns "m_id" and "title".

所以，我想知道a）如何取消;和b）是否可以上几行，如果是这样，怎么样？

Answer 1

如果您创建了savepoints，则可以回滚部分交易。（但这会更加打字。）

当您进行许多更改时，最好在执行之前将所有SQL命令写入文本文件。

Answer 2

ROLLBACK功能会取消整个交易。我没有找到一种逐行返回的方法，因此UPDATE或ALTER命令可以分别用于表或字段/行。

在提交之前取消交易或部分交易？

2 个答案: