[英]How to insert data from one table to another using transactions in SQL?
This is table where I want to insert data这是我要插入数据的表
group_id | customer_id
-----------------------
3 | 14
3 | 8
4 | 14
To insert one value code would be like this:插入一个值代码将是这样的:
BEGIN TRANSACTION
INSERT INTO results(group_id INT, customer_id INT)
VALUES(4, 12)
COMMIT;
What is the correct way to insert multiple customer_id values that I get from complex select statement?插入从复杂的 select 语句中获得的多个 customer_id 值的正确方法是什么? Can it be done like this?
可以这样做吗? Maybe it is better to insert data in local temporary table and only then insert in results table?
也许最好在本地临时表中插入数据然后再插入结果表中?
DECLARE @group_insert INT;
SET @group_insert = 5;
BEGIN TRANSACTION
INSERT INTO results(group_id INT, customer_id INT)
SELECT @group_insert, customer_id ---actual select would have more joins and where conditions
FROM another_table
WHERE customer_id > 10
COMMIT;
Results table should look like this after insert:插入后结果表应如下所示:
group_id | customer_id
-----------------------
3 | 14
3 | 8
4 | 14
5 | 15
5 | 16
5 | 17
DECLARE @group_insert INT;
SET @group_insert = 5;
BEGIN TRANSACTION
INSERT INTO results(group_id , customer_id )
SELECT @group_insert, customer_id
FROM another_table
WHERE customer_id > 10;
COMMIT;
If you want to select group_insert coilumn from another_table then:如果你想 select group_insert column from another_table 然后:
BEGIN TRANSACTION
INSERT INTO results(group_id , customer_id )
SELECT group_insert, customer_id
FROM another_table
WHERE customer_id > 10;
COMMIT;
I think you may have oversimplified but as a guess here's a code which disallows duplicate cids in another table and a procedure which works out the next id for insert and the min cid for input deduping as it goes.我认为您可能过于简化了,但作为一个猜测,这里有一个不允许在另一个表中重复 cid 的代码,以及一个计算下一个 id 用于插入和最小 cid 用于输入重复数据删除的过程。
DROP TABLE IF EXISTS T,T1;
DROP PROCEDURE IF EXISTS P;
CREATE TABLE T (ID INT,CID INT);
CREATE TABLE T1(CID INT PRIMARY KEY);
DROP PROCEDURE IF EXISTS P;
DELIMITER $$
CREATE PROCEDURE P()
BEGIN
SELECT COALESCE(MAX(ID),0) + 1 INTO @NEXTID FROM T;
SET @MAXCID = NULL;
IF @NEXTID = 1 THEN
SET @MAXCID = 0;
ELSE
SELECT MIN(CID) INTO @MAXCID FROM T1 WHERE NOT EXISTS(SELECT CID FROM T WHERE T.CID = T1.CID);
END IF;
IF @MAXCID IS NOT NULL THEN
INSERT INTO T
SELECT @NEXTID,CID
FROM T1
WHERE CID >= @MAXCID;
END IF;
END $$
DELIMITER ;
TRUNCATE TABLE T;
TRUNCATE TABLE T1;
INSERT IGNORE INTO T1 VALUES (1);
CALL P();
INSERT IGNORE INTO T1 VALUES (2),(3);
CALL P();
INSERT IGNORE INTO T1 VALUES (2),(3),(4),(5);
CALL P();
MariaDB [SANDBOX]> select * from t1;
+-----+
| CID |
+-----+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+-----+
5 rows in set (0.002 sec)
MariaDB [SANDBOX]> select * from t;
+------+------+
| ID | CID |
+------+------+
| 1 | 1 |
| 2 | 2 |
| 2 | 3 |
| 3 | 4 |
| 3 | 5 |
+------+------+
5 rows in set (0.001 sec)
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