使用准备工作重置自动增量

Question

使用prepare语句时遇到一些问题，因为我之前从未使用过它.Bellow是我的代码

$maxid = $rowid['product_id'];
$reset = "ALTER TABLE streamyxup AUTO_INCREMENT = $maxid";
$stmt = $conn->PREPARE($reset);
$query->EXECUTE;
DEALLOCATE PREPARE stmt;

Answer 1

您需要更改以下代码才能使用mysql prepared statement

$maxid = $rowid['product_id'];
$reset = "ALTER TABLE streamyxup AUTO_INCREMENT = ?";
$stmt = $conn->prepare($reset);
$stmt->bind_param("i", $maxid);
$stmt->execute();

修改

你正在混合面向对象和mysql的程序方式。更改您的连接代码如下

session_start();
$conn = new mysqli("103.6.xxx.xxx", "Miow", "xxow2!", "pe_tm");

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

Answer 2

SELECT MAX(autoincrement_field) + 1 FROM streamyxup INTO @maxautoinc;
ALTER TABLE streamyxup AUTO_INCREMENT = @maxautoinc;

和

  SELECT @max := MAX(ID)+ 1 FROM streamyxup; 

  PREPARE stmt FROM 'ALTER streamyxup ABC AUTO_INCREMENT = ?';
  EXECUTE stmt USING @max;

  DEALLOCATE PREPARE stmt;