我用笨的活动记录和我的代码是:为什么MySQL不能得到正确的数据?
$current_balance = $this->get_campaign_balance($click_report['campaign_id']);
$campaign_ledger = array(
'campaign_id' => $click_report['campaign_id'],
'description' => "Click Deduction from script",
'amount' => -1 * $click_report['advertiser_spend'],
'balance' => "" . $current_balance - $click_report['advertiser_spend'],
'meta_data' => $click_report['day'],
'timestamp' => time()
);
$this->db->insert('campaign_ledger', $campaign_ledger);
当我var_dump
的$campaign_ledger
我得到:
array(6) {
["campaign_id"]=>
string(3) "277"
["description"]=>
string(27) "Click Deduction from script"
["amount"]=>
float(-0.05)
["balance"]=>
float(89.95)
["meta_data"]=>
string(10) "2012-04-19"
["timestamp"]=>
int(1334881599)
}
但是,当数据进入我的数据库中,balance
是91.36800000000001
为一些原因。那么,有什么关系呢?
编辑
变为DECIMAL(10,4)
后,我仍然得到91.3680
作为输出。
数据库中的余额字段的数据类型是什么? – 2012-04-20 00:29:51
你期望得到什么? – 2012-04-20 00:31:09
我把它作为FLOAT,我改成了'DECIMAL(10,4)',但它仍然关闭 – Shamoon 2012-04-20 00:47:01