Question

我有数十万行文字需要插入并且有几百行需要删除。文本文件如下所示：

i 01 ppp
i 02 vvv
i 45 bbb
...
d 05
i 09 mmm
i 21 jjj
....

“i”使INSERT失效，“d”表示删除DELETE，其余的文本是需要处理的数据。

 insert into t1 (id, name)values(?, ?);
 delete from t1 where id = ?;

我曾经为这些“i”头行读了1000行，addBatch（）和executeBatch（），最后处理了那些“d”头行。是否有可能添加混合插入和删除批处理，然后执行它们？

感谢。

Answer 1

您需要2个多行语句。

INSERT INTO t1 (id, name) VALUES (?, ?), (?, ?) ...;
DELETE FROM t1 WHERE id IN (?, ?, ...);

如果你想要原子操作，锁定表（语句取决于你的数据库）

Answer 2

根据相关数据库的不同，您可以尝试使用merge语句

查看Oracle's Merge语句，例如

MERGE INTO bonuses D
  USING (SELECT employee_id, salary, department_id FROM employees
  WHERE department_id = 80) S
  ON (D.employee_id = S.employee_id)
  WHEN MATCHED THEN UPDATE SET D.bonus = D.bonus + S.salary*.01
    DELETE WHERE (S.salary > 8000)
  WHEN NOT MATCHED THEN INSERT (D.employee_id, D.bonus)
    VALUES (S.employee_id, S.salary*0.1)
    WHERE (S.salary <= 8000);

可以在一个executeBatch中添加INSERT和DELETE

2 个答案: