MySQL->AUTO_INCREMENT[20180516]

MySQL表格中自增长主键AUTO_INCREMENT使用，实现序列的最简单的方式

创建一个AUTO_INCREMENT自增的表

mysql> create table seq_test(
    -> id int  not null auto_increment,
    -> primary key(id),
    -> name varchar(30) not null,
    -> date date not null,
    -> origin varchar(30) not null
    -> )
    -> ;
Query OK, 0 rows affected (0.02 sec)
 
mysql> insert into seq_test(id,name,date,origin)
    -> values(null,'Alex','2018-01-01','test'),
    -> (null,'Frank','2018-05-01','test'),
    -> (null,'Fred','2018-05-01','test'),
    -> (null,'Gxxx','2018-05-01','PCQ')
    -> ;
Query OK, 4 rows affected (0.00 sec)
Records: 4  Duplicates: 0  Warnings: 0
 
mysql>
mysql> select * from seq_test;
+----+-------+------------+--------+
| id | name  | date       | origin |
+----+-------+------------+--------+
|  1 | Alex  | 2018-01-01 | test   |
|  2 | Frank | 2018-05-01 | test   |
|  3 | Fred  | 2018-05-01 | test   |
|  4 | Gxxx  | 2018-05-01 | PCQ    |
+----+-------+------------+--------+
4 rows in set (0.00 sec)

PHP中使用mysqli_insert_id()函数来获取当前插入的序列值

[root@t-xi-oracle01 html]# cat mysqli_select_seq.php
<?php
$dbhost='localhost';
$dbuser='root';
$dbpass='mysql';
$conn=mysqli_connect($dbhost,$dbuser,$dbpass);
if(! $conn)
{
die('Database Connect Failure.' .mysqli_error($conn));
 
}
echo 'Database Connect Successful.<br />';
 
mysqli_query($conn,"set names utf8");
 
$sql_insert='insert into seq_test(name,date,origin) values("Xi","2018-05-16","PCQ")';
 
mysqli_select_db($conn,'runoob');
 
mysqli_query($conn,$sql_insert);
 
$seq = mysqli_insert_id($conn);
 
$sql = "select * from seq_test where id= $seq ";
$retval= mysqli_query($conn,$sql);
 
if (! $retval)
{
die('Select Data Failure.' .mysqli_error($conn));
}
 
echo '<h3>Show Data List</h3>';
echo '<table border="1"> <tr><td>ID</td><td>Name</td><td>Date</td><td>Origin</td><tr>';
 
while($row=mysqli_fetch_array($retval,MYSQLI_NUM))
{
echo "<tr><td>{$row[0]}</td>".
        "<td>{$row[1]}</td>".
        "<td>{$row[2]}</td>".
        "<td>{$row[3]}</td>".
        "</tr>";
 
}
echo '</table>';
mysqli_free_result($retval);
mysqli_close($conn);
 
 
?>

对现有AUTO_INCREMENT列进行重置

alter table seq_test drop id;
 
alter table seq_test add id int not null auto_increment first,add primary key (id);

为AUTO_INCREMENT给予起始值

从序列100数值开始

create table seq_test02
(
id int not null auto_increment,
primary key(id),
name varchar(30) not null,
date date not null,
origin varchar(30) not null
)engine=InnoDB auto_increment=100 charset=utf8;
 
 
insert into seq_test02(name,date,origin) select name,date,origin from seq_test;
truncate table seq_test02;

从序列500数值开始

alter table seq_test02 auto_increment= 500;
  
insert into seq_test02(name,date,origin) select name,date,origin from seq_test limit 10;
 
mysql> select * from seq_test02;
+-----+-------+------------+--------+
| id  | name  | date       | origin |
+-----+-------+------------+--------+
| 500 | Alex  | 2018-01-01 | test|
| 501 | Frank | 2018-05-01 | test |
| 502 | Fred  | 2018-05-01 | test |
| 503 | Gxxx  | 2018-05-01 | PCQ    |
| 504 | Xi    | 2018-05-16 | PCQ    |
| 505 | Xi    | 2018-05-16 | PCQ    |
| 506 | Xi    | 2018-05-16 | PCQ    |
| 507 | Xi    | 2018-05-16 | PCQ    |
| 508 | Xi    | 2018-05-16 | PCQ    |
| 509 | Xi    | 2018-05-16 | PCQ    |
+-----+-------+------------+--------+
10 rows in set (0.00 sec)

MySQL->AUTO_INCREMENT[20180516]

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