在PHP中编写MySQL数据库查找/替换脚本

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
  die("连接失败: " . $conn->connect_error);
}

$old_value = "old_value";
$new_value = "new_value";

// 查找需要替换的数据
$sql = "SELECT * FROM myTable WHERE column_name LIKE '%$old_value%'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
  // 遍历查询结果，并进行替换
  while($row = $result->fetch_assoc()) {
    $id = $row["id"];
    $column_name = str_replace($old_value, $new_value, $row["column_name"]);

    // 更新数据
    $sql = "UPDATE myTable SET column_name='$column_name' WHERE id=$id";
    $conn->query($sql);
  }
} else {
  echo "0 结果";
}

$conn->close();