我正在尝试从数据库中选择一个值,例如
$stmt = $pdo->query('SELECT acc_id FROM account_info WHERE acc_id = (the most recent value entered ');
我试过了:
$stmt = $pdo->query('SELECT acc_id FROM account_info WHERE acc_id = "26" ');
它成功了。无论什么时候我尝试这样的事情:
$stmt = $pdo->query('SELECT acc_id FROM account_info WHERE acc_id = :acc_id');
或
$stmt = $pdo->query('SELECT acc_id FROM account_info WHERE acc_id = $acc_id ');
我收到以下错误:
core.js:1350 ERROR SyntaxError: Unexpected token S in JSON at position 0
at JSON.parse (<anonymous>)
我的TS代码:
load()
{
this.http.get('http://localhost:10080/ionic/patients.php')
.map(res => res.json())
.subscribe(data =>
{
this.items = data;
});
}
viewEntry(param)
{
this.navCtrl.push('AccInfoPage',param);
}
这是我的HTML:
<ion-item *ngFor="let item of items">
<h2>{{ item.acc_id }} </h2>
<button ion-button color="primary" item-right (click)="viewEntry({ account: item })">View</button>
</ion-item>
我做错了什么?我该怎么解决? 提前谢谢!
答案 0 :(得分:1)
如果要创建和执行预准备语句,则需要先准备查询,绑定参数然后执行。
$stmt = $pdo->prepare('SELECT acc_id FROM account_info WHERE acc_id = :acc_id');
$stmt->execute([':acc_id' => 26]);
$result = $stmt->fetchAll();
答案 1 :(得分:0)
SELECT acc_id FROM account_info ORDER BY acc_id DESC LIMIT 1