將數據從一個SQL表行插入到字段匹配的另一行-Entity Framework

Question

我在SQL數據庫中有兩個表。 它們都有五個字段： ID （PK）， Number ， InvoiceDate ， InvoiceNumber和InvoiceAmount 。 我正在嘗試使用Entity Framework插入InvoiceDate，InvoiceNumber和InvoiceAmount，其中字段號從一個表匹配到另一個表。

表一的上下文是：

var tc = new TemporaryCsvUpload();

表二：

var pt = new PermanentTestTable();

首先，我將值從CSV插入表1中，現在嘗試在Number字段匹配的表2中插入值。

                var entity = new CsvDbEntities1();

            foreach (var item in model)
            {
                var tc = new TemporaryCsvUpload();
                tc.Number = item.Number;
                tc.CreditInvoiceAmount = item.CreditInvoiceAmount;
                tc.CreditInvoiceDate = item.CreditInvoiceDate;
                tc.CreditInvoiceNumber = item.CreditInvoiceNumber;
                entity.TemporaryCsvUploads.Add(tc);

                entity.SaveChanges();
            }

我是EF的新手，我們將不勝感激。 謝謝！

Answer 1

抱歉，如果我不完全了解，但這里基於以下代碼：

foreach (var item in model)
        {
            var tc = new TemporaryCsvUpload();
            tc.Number = item.Number;
            tc.CreditInvoiceAmount = item.CreditInvoiceAmount;
            tc.CreditInvoiceDate = item.CreditInvoiceDate;
            tc.CreditInvoiceNumber = item.CreditInvoiceNumber;
            entity.TemporaryCsvUploads.Add(tc);

            entity.SaveChanges();
        }

保存第一個表后，現在查詢第二個表，以獲取與以下記錄相同的記錄：

var table2entity = entity.PermanentTestTable.Where(x => x.Number == tc.Number).Select(x => x).First();

這將查詢第二個表並獲取具有相同編號的任何實體

因此，您的最終代碼可能如下所示：

var entity = new CsvDbEntities1();

        foreach (var item in model)
        {
            var tc = new TemporaryCsvUpload();
            tc.Number = item.Number;
            tc.CreditInvoiceAmount = item.CreditInvoiceAmount;
            tc.CreditInvoiceDate = item.CreditInvoiceDate;
            tc.CreditInvoiceNumber = item.CreditInvoiceNumber;
            entity.TemporaryCsvUploads.Add(tc);

            entity.SaveChanges();

            var table2entity = entity.PermanentTestTable.ToList();
            table2entity = table2entity.Where(x => x.Number == tc.Number).Select(x => x).First();
            table2entity.CreditInvoiceAmount = item.CreditInvoiceAmount;
            //More values inserted here
            entity.SaveChanges()
        }

Answer 2

我最終不得不嵌套一個foreach循環，以使用Number字段遍歷每一行。 我敢肯定有更好的方法可以做到這一點，但我很高興它正在起作用：

var entity = new CsvDbEntities1();

            foreach (var item in model)
            {
                var tc = new TemporaryCsvUpload
                {
                    PoNumber = item.Number,
                    CreditInvoiceAmount = item.CreditInvoiceAmount,
                    CreditInvoiceDate = item.CreditInvoiceDate,
                    CreditInvoiceNumber = item.CreditInvoiceNumber
                };
                entity.TemporaryCsvUploads.Add(tc);

                var ptt = entity.PermanentTestTables.ToList().Where(x => x.Number == tc.Number);

                foreach (var row in ptt)
                {
                    row.CreditInvoiceDate = tc.CreditInvoiceDate;
                    row.CreditInvoiceNumber = tc.CreditInvoiceNumber;
                    row.CreditInvoiceAmount = tc.CreditInvoiceAmount;
                }
                entity.SaveChanges();
            }