如何从数据库和 map 中获取数据进行反应？

Question

来自数据库的数据非常好但我不知道如何 map 该数据或如何调用来自数据库的特定列。 这是控制台向我显示的 output，数据即将到来

请有任何建议。 如果有人用代码解决这个问题会更好。

渲染 Function

  const [products,setProducts] = useState({});

  const classes = useStyles();

  useEffect(()=>{
    axios.post('/UserPortal/CartItems/checkout_details_summary.php' , {
        customer_id: localStorage.getItem('Id'),
    } )
    .then((response) => {
        console.log(response.data);
        setProducts(response.data);  
        

    })  
  },[])
 

返回

 return (
    
    <React.Fragment>
      <Typography variant="h4" gutterBottom>
        Order summary
      </Typography>
     
     
      <List disablePadding>
   
          <ListItem className={classes.listItem}  key={products.name} >
           <ListItemText secondary={'x'  + products.quantity   }>
                <Typography variant="h4" gutterBottom>
                  {products.name}  
               </Typography> 
             </ListItemText>  
              <Typography variant="h5"> {products.total} </Typography>
           </ListItem>
         
       
        <ListItem className={classes.listItem}>
          <ListItemText> <Typography variant="h4" gutterBottom>Total</Typography></ListItemText>
          <Typography variant="h5" className={classes.total}>
            {'Rs. '  + products.net_total  }
          </Typography>
        </ListItem>
   
      </List>
</React.Fragment>
);

这是我的 PHP 代码

<?php

require 'connect.php';

$postdata = file_get_contents("php://input");

if(isset($postdata) && !empty($postdata))
{
    $request = json_decode($postdata);
    
    $customer_id = $request->customer_id;

    $sql = ("SELECT * FROM `checkout_details` WHERE `customer_id` = '{$customer_id}' LIMIT 1");

    
$result = mysqli_query($con, $sql);
$row = mysqli_fetch_assoc($result);
echo $json = json_encode($row);

}

Answer 1

我认为你的const [products,setProducts] = useState({}); 应该是一个对象数组const [products,setProducts] = useState([]); .

然后您可以使用.map方法对其进行迭代。 您可以像这样访问每个 Object 解构参数的密钥，例如：

return (
    
    <React.Fragment>
      <Typography variant="h4" gutterBottom>
        Order summary
      </Typography>
     
     {products.map(({ name, total, net_total }) => 
      <List disablePadding>
   
          <ListItem className={classes.listItem}  key={products.name} >
           <ListItemText secondary={'x'  + products.quantity   }>
                <Typography variant="h4" gutterBottom>
                  {name}  
               </Typography> 
             </ListItemText>  
              <Typography variant="h5"> {total} </Typography>
           </ListItem>
         
       
        <ListItem className={classes.listItem}>
          <ListItemText> <Typography variant="h4" gutterBottom>Total</Typography></ListItemText>
          <Typography variant="h5" className={classes.total}>
            {'Rs. '  + net_total  }
          </Typography>
        </ListItem>
   
      </List>
    )}
</React.Fragment>
);