Question

我有以下代码：

exports.handler = function(event, context) {
    console.log("Request received:\n", JSON.stringify(event));
    console.log("Context received:\n", JSON.stringify(context));

var doc = require('dynamodb-doc');
var dynamodb = new doc.DynamoDB();

var Message = callback();
var datetiem = new Date().toISOString().split('T')[0];
    console.log('date is ', datetiem); // prints 2018-01-09

var datetime1 = JSON.stringify(datetiem);    
console.log(datetime1); //prints "2018-01-09"

var  params = {
Key: {
     "abc" : datetime1
},
TableName: 'myTable',
ProjectionExpression: 'message'
};

function callback (message) {
dynamodb.getItem(params, function (err, data) {
        if (err) {
           context.fail('ERROR: Dynamo failed: ' + err);
        } else {
         console.log('Dynamo Success: ' + JSON.stringify(data, null, '  '));
                 console.log('data', data)
                  let Message = data['Item'].message;
                    console.log('test',Message);
         }

  });
}
};

问题是，当我尝试在Eventhandler中读取原始值时，我得到public Test() { var dt = new DataTable("arguments"); dt.Columns.Add("id", typeof(string)); dt.Columns.Add("name", typeof(string)); dt.Columns.Add("type", typeof(string)); dt.Rows.Add("a", "b", "c"); dt.Rows.Add("1", "2", "3"); dt.RowDeleted += DtOnRowDeleted; dt.Rows[0].Delete(); } private void DtOnRowDeleted(object sender, DataRowChangeEventArgs e) { var id = e.Row["id", DataRowVersion.Original]; }：

VersionNotFoundException

如何从已删除的数据行中获取ID？

Answer 1

在设置表格后添加AcceptChanges方法。

dt.Rows.Add("a", "b", "c");
dt.Rows.Add("1", "2", "3");
dt.AcceptChanges();
dt.RowDeleted += DtOnRowDeleted;

RowDeleted-Event中的Originalvalue

1 个答案: