Question

我正在尝试将新行插入到我的MySQL表中，除非for列中具有相同值的行存在，在这种情况下我想更新该行。我的疑问是：

var sum = 0;
var newArray = [];
for (var i=0; i<a.length;i++){
    for (var j=0;j<a.length;j++){
        if(a[i]['taxid']==a[j]['taxid']){
            sum = a[i]['tax_value'] + a[j]['tax_value'];
        }
    }
    newArray.push({taxid : a[i]['taxid'], tax_value : sum});
}

和表结构如下：

campign_id

现在我明显错误地认为，因为INSERT INTO prv_campaigns SET website_id = %s,account_id = %s,campaign_id = %s,campaign_name = %s,start_date = %s, end_date = %s,targeting_type = %s,enabled = %s,status = %s,bid_type = %s, default_bid = %s,min_bid = %s,max_bid = %s,budget = %s,cost = %s,ctr = %s, utm_codes = %s,country_codes = %s,country_targeting = %s,opt = %s, device_targeting = %s,language_targeting = %s,exclude_low_volume = %s ON DUPLICATE KEY UPDATE campaign_name = %s, start_date = %s, end_date = %s, targeting_type = %s, enabled = %s, status = %s, bid_type = %s, default_bid = %s, min_bid = %s, max_bid = %s, budget = %s, cost = %s, ctr = %s, utm_codes = %s, country_codes = %s, country_targeting = %s, opt = %s, device_targeting = %s, language_targeting = %s, exclude_low_volume是一个独特的键，然后查询的更新部分将发生，而是在我的数据库中创建一个新行...任何想法如何解决这个问题？ THX

Answer 1

campaign_id 不是唯一键。它是四部分唯一键的一个元素。四个组合是唯一的。不是每个人都单独。

如果您希望它是唯一的，请将其声明为：unique (campaign_id)。您可能还希望其他字段“单独”唯一。

如果您愿意，可以将此约束添加到表中：

alter table prv_campaigns  add constraint unq_campaigns_campaign_id
    unique (campaign_id);

MySQL ON DUPLICATE KEY UPDATE插入新行

1 个答案: