Question

我在数据库表中有一组记录，其中一列有字符串值。类似HeyHelloWorld1或HeyGoodDayWorld2或HeyHowdyWorld32的内容。我需要将它们全部更改为GoodEveningWorld（以及字符串末尾的任何内容）。我正在尝试运行脚本，但这需要太长时间，我想知道是否有人知道实现这个的最快方法

剧本：

$con=mysqli_connect("localhost","user","password","db");
// Check connection
if (mysqli_connect_errno())
 {
   echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }
 $str_to_look_for = 'Hey';
 $new_str = 'GoodEvening';
 $result = mysqli_query($con,"SELECT * FROM table1 WHERE item LIKE '%$str%'");
 if(!$result) echo "No records found?";
  else
    {
  echo " Found ".mysqli_num_rows($result)." rows<br/>... Executing script...";
      while($row = mysqli_fetch_array($result))
         {
          $val = strstr($row['item'], '/World');
          $new_val = $new_str.$val;
          $id = $row['ID'];
          insert($new_val, $id, $con);
        }
        echo " DONE!";
    }


  function insert($x, $id, $con)
      {
    $result = mysqli_query($con,"UPDATE table1 SET item = '$x' WHERE ID = '$id'");
    if (!$result) echo "missed..<br/>";
      }

Answer 1

查看MySQL String functions并考虑直接在数据库中替换它。

UPDATE table1 
SET item = 
  CONCAT(
    'GoodEvening',
    SUBSTRING( item, INSTR( item, 'World') ) 
  )

这适用于World，而不仅仅是HelloWorld或HayWorld。

查找，获取和替换数据库中部分字符串的最快方法

1 个答案: