в 13:44, 26 мая 2010

2010-05-26T13:44:56Z

Admin: 1 версия

2010-05-26T09:50:58Z

1 версия

Новая страница

== LAST_INSERT_ID(expr)==



<source lang="sql">
mysql>
mysql> CREATE TABLE sequence (id INT NOT NULL);
Query OK, 0 rows affected (0.05 sec)
mysql>
mysql> INSERT INTO sequence VALUES (0);
Query OK, 1 row affected (0.00 sec)
mysql>
mysql> UPDATE sequence SET id=LAST_INSERT_ID(id+1);
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql>
mysql> SELECT LAST_INSERT_ID();
+------------------+
| LAST_INSERT_ID() |
+------------------+
| 1 |
+------------------+
1 row in set (0.00 sec)
mysql>
mysql> drop table sequence;
Query OK, 0 rows affected (0.00 sec)
mysql></source>

== LAST_INSERT_ID() returns the first automatically generated value set for an AUTO_INCREMENT column==

<p>If you insert multiple rows using a single INSERT statement, LAST_INSERT_ID() returns the value generated for the first inserted row only.</p>



<source lang="sql">
mysql>
mysql> CREATE TABLE t (
-> id INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
-> name VARCHAR(10) NOT NULL
-> );
Query OK, 0 rows affected (0.03 sec)
mysql>
mysql> INSERT INTO t VALUES (NULL, "Bob");
Query OK, 1 row affected (0.00 sec)
mysql>
mysql> SELECT * FROM t;
+----+------+
| id | name |
+----+------+
| 1 | Bob |
+----+------+
1 row in set (0.00 sec)
mysql> SELECT LAST_INSERT_ID();
+------------------+
| LAST_INSERT_ID() |
+------------------+
| 1 |
+------------------+
1 row in set (0.00 sec)
mysql>
mysql> INSERT INTO t VALUES (NULL, "Mary"),
-> (NULL, "Jane"),
-> (NULL, "Lisa");
Query OK, 3 rows affected (0.02 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql>
mysql> SELECT * FROM t;
+----+------+
| id | name |
+----+------+
| 1 | Bob |
| 2 | Mary |
| 3 | Jane |
| 4 | Lisa |
+----+------+
4 rows in set (0.00 sec)
mysql>
mysql> SELECT LAST_INSERT_ID();
+------------------+
| LAST_INSERT_ID() |
+------------------+
| 2 |
+------------------+
1 row in set (0.00 sec)
mysql>
mysql> drop table t;
Query OK, 0 rows affected (0.00 sec)</source>

← Предыдущая	Версия 13:44, 26 мая 2010
(нет различий)

MySQL Tutorial/Information Functions/LAST INSERT ID - История изменений

в 13:44, 26 мая 2010

Admin: 1 версия