获取任意表的当前AUTO_INCREMENT值

你可以使用这个查询来获取所有的表数据:

SHOW TABLE STATUS FROM `DatabaseName` WHERE `name` LIKE 'TableName' ;

你可以通过使用这个查询来获得确切的信息:

SELECT `AUTO_INCREMENT`
FROM  INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'DatabaseName'
AND   TABLE_NAME   = 'TableName';

我相信你正在寻找MySQL的LAST_INSERT_ID ()函数。如果在命令行中，只需执行以下命令:

LAST_INSERT_ID();

你也可以通过SELECT查询得到这个值:

SELECT LAST_INSERT_ID();

如果你只是想知道这个数字，而不是在查询中得到它，那么你可以使用:

SHOW CREATE TABLE tablename;

您应该在底部看到auto_increment

Mysqli可执行示例代码:

<?php
$db = new mysqli("localhost", "user", "password", "YourDatabaseName");
if ($db->connect_errno) die ($db->connect_error);


$table=$db->prepare("SHOW TABLE STATUS FROM YourDatabaseName");
$table->execute();
$sonuc = $table->get_result();
while ($satir=$sonuc->fetch_assoc()){
if ($satir["Name"]== "YourTableName"){
$ai[$satir["Name"]]=$satir["Auto_increment"];
}
}
$LastAutoIncrement=$ai["YourTableName"];
echo $LastAutoIncrement;
?>

如果列在sql server中是自动递增的，那么要查看当前自动递增的值，如果您想编辑该列的值，请使用以下查询。

-- to get current value
select ident_current('Table_Name')


-- to update current value
dbcc checkident ('[Table_Name]',reseed,"Your Value")

如果手动运行查询，即使methai的答案是正确的，但当2个并发事务/连接在生产环境(例如)的运行时实际执行此查询时，就会出现问题。

刚刚在MySQL工作台中手动尝试了同时打开2个连接:

CREATE TABLE translation (
id BIGINT PRIMARY KEY AUTO_INCREMENT
);
# Suppose we have already 20 entries, we execute 2 new inserts:

事务1:

21 = SELECT `AUTO_INCREMENT` FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'DatabaseName' AND TABLE_NAME = 'translation';


insert into translation (id) values (21);

事务2:

21 = SELECT `AUTO_INCREMENT` FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'DatabaseName' AND TABLE_NAME = 'translation';


insert into translation (id) values (21);


# commit transaction 1;
# commit transaction 2;

• 插入事务1是可以的
• 事务2插入错误:错误代码:1062。重复输入'21'键'主'。

一个好的解决方案是jvdub的答案，因为每个事务/连接的2个插入将是:

事务1:

insert into translation (id) values (null);
21 = SELECT LAST_INSERT_ID();

事务2:

insert into translation (id) values (null);
22 = SELECT LAST_INSERT_ID();


# commit transaction 1;
# commit transaction 2;

同样，我们不能执行下面的2个查询:

insert into translation (id) values ((SELECT AUTO_INCREMENT FROM
information_schema.TABLES WHERE TABLE_SCHEMA=DATABASE()
AND TABLE_NAME='translation'));

因为我们实际上感兴趣的是在其他表中抓取/重用ID或返回!

编辑:02/08/2021，检索值

要实际检索应用程序中的值(使用MyBatis在Java中完成的示例):

@Mapper
public interface ClientMapper {
@Select("select last_insert_id()")
Long getLastInsertedId();


@Insert({...})
void insertClientInfo(ClientInfo client);
}

然后在存储库中

public void insertClientInfo(ClientInfo clientInfo) {
mapper.insertClientInfo(clientInfo);
Long pk = mapper.getLastInsertedId();
clientInfo.setId(pk);
}

我也在寻找相同的方法，最终在Helper类中创建了一个静态方法(在我的情况下，我将其命名为App\Helpers\Database)。

该方法

/**
* Method to get the autoincrement value from a database table
*
* @access public
*
* @param string $database The database name or configuration in the .env file
* @param string $table    The table name
*
* @return mixed
*/
public static function getAutoIncrementValue($database, $table)
{
$database ?? env('DB_DATABASE');


return \DB::select("
SELECT AUTO_INCREMENT
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = '" . env('DB_DATABASE') . "'
AND TABLE_NAME = '" . $table . "'"
)[0]->AUTO_INCREMENT;
}

要调用该方法并获得MySql的AUTO_INCREMENT，只需使用以下命令:

$auto_increment = \App\Helpers\Database::getAutoIncrementValue(env('DB_DATABASE'), 'your_table_name');

希望能有所帮助。

查询一个给定模式的所有表(除了类型为长整型数字无符号的列)的AUTO_INCREMENT的“使用率”百分比:

SELECT
c.TABLE_NAME,
c.COLUMN_TYPE,
c.MAX_VALUE,
t.AUTO_INCREMENT,
IF (c.MAX_VALUE > 0, ROUND(100 * t.AUTO_INCREMENT / c.MAX_VALUE, 2), -1) AS "Usage (%)"
FROM
(SELECT
TABLE_SCHEMA,
TABLE_NAME,
COLUMN_TYPE,
CASE
WHEN COLUMN_TYPE LIKE 'tinyint(1)' THEN 127
WHEN COLUMN_TYPE LIKE 'tinyint(1) unsigned' THEN 255
WHEN COLUMN_TYPE LIKE 'smallint(%)' THEN 32767
WHEN COLUMN_TYPE LIKE 'smallint(%) unsigned' THEN 65535
WHEN COLUMN_TYPE LIKE 'mediumint(%)' THEN 8388607
WHEN COLUMN_TYPE LIKE 'mediumint(%) unsigned' THEN 16777215
WHEN COLUMN_TYPE LIKE 'int(%)' THEN 2147483647
WHEN COLUMN_TYPE LIKE 'int(%) unsigned' THEN 4294967295
WHEN COLUMN_TYPE LIKE 'bigint(%)' THEN 9223372036854775807
WHEN COLUMN_TYPE LIKE 'bigint(%) unsigned' THEN 0
ELSE 0
END AS "MAX_VALUE"
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE EXTRA LIKE '%auto_increment%'
) c


JOIN INFORMATION_SCHEMA.TABLES t ON (t.TABLE_SCHEMA = c.TABLE_SCHEMA AND t.TABLE_NAME = c.TABLE_NAME)


WHERE
c.TABLE_SCHEMA = 'YOUR_SCHEMA'
ORDER BY
`Usage (%)` DESC;

列出dbname所有tabename和AUTO_INCREMENT

SELECT `AUTO_INCREMENT`,`TABLE_NAME`
FROM  INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'dbname' ORDER BY AUTO_INCREMENT desc