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Amazon dynamodb 从表dynamo DB获取所有数据_Amazon Dynamodb - Fatal编程技术网

Amazon dynamodb 从表dynamo DB获取所有数据

Amazon dynamodb 从表dynamo DB获取所有数据,amazon-dynamodb,Amazon Dynamodb,我想在前端文件order.js中显示表“orders”中的所有数据 我在我的app.js app.post('/api/myorders', function (req, res) { var params = { TableName: "orders", Select: "ALL_ATTRIBUTES", }; docClient.scan(params, onScan); functi

我想在前端文件
order.js
中显示表“orders”中的所有数据

我在我的
app.js

app.post('/api/myorders', function (req, res) {
    var params = {
        TableName: "orders",
        Select: "ALL_ATTRIBUTES",
    };

    docClient.scan(params, onScan);

    function onScan(err, data) {
        if (err) {
            console.error("Unable to scan the table. Error JSON:", JSON.stringify(err, null, 2));
            res.send({ success: false,message:JSON.stringify(err, null, 2)})
        } else {
            res.send( {success: true,orders:data.Items})
        }
    }
});
在我的前端文件
order.js
中,我获取的数据如下

const options = {
            method: "post",
            headers: {
                "Accept": "application/json",
                "Content-type": "application/json",
                'Authentication': user.getHmac('POST', '/api/myorders')
            },
        };

        fetch(process.env.REACT_APP_DB_URI + "/myorders", options)
            .then(res => res.json())
            .catch(error => {

                console.error("Error:", error)
                setErrors("There was an error getting orders.")
            })
            .then(response => {
                if (response.success) {
                    console.log("Success:", response)

                }
                else {
                    console.log("Error:", response)
                    setErrors("There was an error getting order.")

                }
            });
但是不断地出错

"success":false,"message":"{\n  \"message\": \"ExpressionAttributeValues must not be empty\",\n  \"code\": \"ValidationException\",\n  \"time\": \"2020-08-30T07:53:06.375Z\",\n  \"requestId\": \"11OEEP6KPETMRVVCBE2RD03MJFVV4KQNSO5AEMVJF66Q9ASUAAJG\",\n  \"statusCode\": 400,\n  \"retryable\": false,\n  \"retryDelay\": 25.696811530071486\n}"}

请知道如何解决这个问题,在当前的API状态下,你不能这样做。扫描和查询都要求至少执行一个条件。DDB中没有可用的全选操作

作为一种解决方法,您可以将具有常量值的属性添加到数据项并存储它。在该属性上创建全局二级索引时,可以将其用作键条件表达式,以选择所有可用记录。但请注意,这将被视为反模式