批量插入 Oracle 数据库:哪个更好:FOR Cursor 循环还是简单的 Select? [英] Bulk Insert into Oracle database: Which is better: FOR Cursor loop or a simple Select?

问题描述

哪个是批量插入 Oracle 数据库的更好选择?一个 FOR 光标循环，如

Which would be a better option for bulk insert into an Oracle database ? A FOR Cursor loop like

DECLARE
   CURSOR C1 IS SELECT * FROM FOO;
BEGIN
   FOR C1_REC IN C1 LOOP
   INSERT INTO BAR(A,
                B,
                C)
          VALUES(C1.A,
                 C1.B,
                 C1.C);
   END LOOP;
END

或简单的选择，例如:

INSERT INTO BAR(A,
                B,
                C)
        (SELECT A,
                B,
                C
        FROM FOO);

有什么具体原因，哪一个会更好?

Any specific reason either one would be better ?

推荐答案

我推荐选择选项，因为光标需要更长的时间.
对于必须修改查询的任何人来说，使用 Select 也更容易理解

I would recommend the Select option because cursors take longer.
Also using the Select is much easier to understand for anyone who has to modify your query

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