mysql 一次更新(update)多條記錄

來源:互聯網
上載者:User

工作中遇到一個問題:要更新一個資料表。

這個表是我自己建立的,有7個欄位,id、name、package等等

建立的時候,因為我把name、package的資訊分別存在兩個文字檔中,

所以我就用Insert方法,一次性將所有的name插入資料庫中。

name全部匯入資料庫中了,但是我的package沒有匯入,這時我仍然想用insert的方法插入,但是不行。

這時候應該利用update的方法。一次更新多條資訊的思路如下:

UPDATE table_name    SET field_name = CASE other_field        WHEN 1 THEN 'value'        WHEN 2 THEN 'value'        WHEN 3 THEN 'value'    ENDWHERE id IN (1,2,3)

測試代碼如下:

<?php/**function:insert app's apk ,logo_url, document_title,app_desc,package_name*into talbe atable use database db .*///connect database catx.$server='localhost';$user='root';$passwd='root';$port='3306';$dbname='catx';$link=mysql_connect($server,$user,$passwd);if (!$link) {die('Could not connect: ' . mysql_error());}else echo "Connected successfully\n";mysql_select_db("db",$link);//set init variable and start time$st=microtime_float();$table="pydot_g";$path = "txt";$fname_package_name  ="package_name.txt";//$handle= @fopen($path."/".$fname_package_name, "r");  $i=1;$sql = "UPDATE pydot_g SET package_name = CASE id "; $ids="";while(($buf[$i]=fgets($handle,512))!==false){  $sql .= sprintf("WHEN %d THEN '%s' ", $i, $buf[$i]);  // 拼接SQL語句  $ids .= sprintf("%d,",$i);$i++;}  //$ids=implode(',',$ids);$ids.=$i;$sql .= "END WHERE id IN ($ids)";  echo $sql;  mysql_query($sql);fclose($handle);mysql_close($link);//echo the results and total time used$et=microtime_float();$t=$et-$st;echo "\r\ninsert into talbe ",$table," ",$i,"times;\r\n";echo "Total time $t seconds.\r\n";//function calculate time ,return a float numberfunction microtime_float(){  list($usec, $sec) = explode(" ", microtime());return ((float)$usec + (float)$sec);}?>

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