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MySQL LAST_INSERT_ID() 函数有什么用?

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2023-09-20 13:41:02842浏览

MySQL LAST_INSERT_ID() 函数有什么用?

MySQL LAST_INSERT_ID() 函数用于通过 AUTO_INCRMENT 获取最近生成的序列号。

示例

在这个示例中,我们是创建一个名为“Student”的表,该表具有 AUTO_INCRMENT 列。我们在“Name”列中插入两个值,当我们使用 INSERT_LAST_ID() 函数时,它会返回最近生成的序列号,即 2。

mysql> Create table Student(Id INT PRIMARY KEY NOT NULL AUTO_INCREMENT, Name Varchar(5));
Query OK, 0 rows affected (0.13 sec)

mysql> Insert into student(Name) Values('Raman');
Query OK, 1 row affected (0.06 sec)

mysql> Insert into student(Name) Values('Rahul');
Query OK, 1 row affected (0.07 sec)

mysql> Select* from student;
+----+-------+
| Id | Name |
+----+-------+
| 1 | Raman |
| 2 | Rahul |
+---+-------+
2 rows in set (0.00 sec)

mysql> Select Last_insert_id();
+------------------+
| Last_insert_id() |
+------------------+
|                2 |
+------------------+
1 row in set (0.00 sec)

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