PHP实现拼接SQL语句批量更新多个字段

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一、SQL语句

1、批量更新一个字段：

UPDATE `user`
SET `name` = CASE id
WHEN 1 THEN '张三'
WHEN 2 THEN '李四'
WHEN 3 THEN '王五'
END
WHERE id IN (1,2,3)

这句sql 的意思是，更新user表的name字段，如果id=1 则name的值为张三，如果id=2 则name的值为李四

2、批量更新多个字段：

UPDATE `user`
SET
`name` = CASE id
WHEN 1 THEN '张三'
WHEN 2 THEN '李四'
WHEN 3 THEN '王五'
END,
age = CASE id
WHEN 1 THEN 16
WHEN 2 THEN 17
WHEN 3 THEN 18
END
WHERE id IN (1,2,3)

二、案例
/

/@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['fax'] ? $v['fax'] : '';
                $phone = $v['phone'] ? $v['phone'] : '';
                $id = $v['id'];
                    
                if($fax || $phone ){
                    if($fax && strstr($fax, '-')){
                        $fax = substr($fax,strpos($fax,'-')+1);    //截取第一个 - 后面的内容
                    }
                    if($phone && strstr($phone, '-')){
                        $phone = substr($phone,strpos($phone,'-')+1);    //截取第一个 - 后面的内容
                    }
                }
                    
                $data[] = ['id'=>$id,'fax'=>$fax,'phone'=>$phone];
            }
            if($data){
                $sql .= " UPDATE crm_client_gather SET fax = CASE id ";
                $faxArr = array_column($data, 'fax', 'id');
                foreach ($faxArr as $k => $v){
                    $sql .= " WHEN {$k} THEN '{$v}' ";
                }
                $sql .= " END, ";
                    
                $phoneArr = array_column($data, 'phone','id');
                $sql .= " phone = CASE id ";
                foreach ( $phoneArr as $k => $v ){
                    $sql .= " WHEN {$k} THEN '{$v}' ";
                }
                $sql .= ' END ';
                    
                $idArr = array_column($data, 'id');
                $sql .= " WHERE id IN ( ";
                foreach ($idArr as $k => $v){
                    if($idArr[count($idArr)-1] == $v ){
                        $sql .= $v;
                    }else{
                        $sql .= $v.',';
                    }
                }
                $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
            }
        }
    }
}

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