PHP implémente l'épissage des instructions SQL pour mettre à jour par lots plusieurs champs

/@todo 去除表中电话和传真的 '-'
//表的最小ID是1，最大ID是121329;fax和phone都是varchar类型
//每次查询100条数据，拼接sql语句批量更新
public function updeAction(){
    set_time_limit(0);
    $mGather = new ClientGatherModel();
    //$mGather->setDb('gather');    //读线上gather库[区分线上和线下数据库]
    $cnt = 0;
    $minId = 1;
    $maxId = 121329;
    //每次最多插入100条数据，程序拼接
    for ($x=$minId; $x<=$maxId; $x+=100){
        $littleMax = $x+99;
        $querySql = "select * from crm_client_gather where id>=$x and id <=$littleMax order by id asc";
        $result = $mGather->query($querySql);
        $data = [];
        $sql = "";
        if($result){
            foreach ($result as $k => $v){
                $fax = $v[&#39;fax&#39;] ? $v[&#39;fax&#39;] : &#39;&#39;;
                $phone = $v[&#39;phone&#39;] ? $v[&#39;phone&#39;] : &#39;&#39;;
                $id = $v[&#39;id&#39;];
                    
                if($fax || $phone ){
                    if($fax && strstr($fax, &#39;-&#39;)){
                        $fax = substr($fax,strpos($fax,&#39;-&#39;)+1);    //截取第一个 - 后面的内容
                    }
                    if($phone && strstr($phone, &#39;-&#39;)){
                        $phone = substr($phone,strpos($phone,&#39;-&#39;)+1);    //截取第一个 - 后面的内容
                    }
                }
                    
                $data[] = [&#39;id&#39;=>$id,&#39;fax&#39;=>$fax,&#39;phone&#39;=>$phone];
            }
            if($data){
                $sql .= " UPDATE crm_client_gather SET fax = CASE id ";
                $faxArr = array_column($data, &#39;fax&#39;, &#39;id&#39;);
                foreach ($faxArr as $k => $v){
                    $sql .= " WHEN {$k} THEN &#39;{$v}&#39; ";
                }
                $sql .= " END, ";
                    
                $phoneArr = array_column($data, &#39;phone&#39;,&#39;id&#39;);
                $sql .= " phone = CASE id ";
                foreach ( $phoneArr as $k => $v ){
                    $sql .= " WHEN {$k} THEN &#39;{$v}&#39; ";
                }
                $sql .= &#39; END &#39;;
                    
                $idArr = array_column($data, &#39;id&#39;);
                $sql .= " WHERE id IN ( ";
                foreach ($idArr as $k => $v){
                    if($idArr[count($idArr)-1] == $v ){
                        $sql .= $v;
                    }else{
                        $sql .= $v.&#39;,&#39;;
                    }
                }
                $sql .=")";
                    
                $mGather->query($sql);
                    
                if( $littleMax > $maxId ){
                    $biggerId = $maxId;
                }else{
                    $biggerId = $littleMax;
                }
                echo "ID:[{$x}]-[$biggerId] 更新了 [".count($data)."]条数据 ";//打印进度
            }
        }
    }
}