Update demo

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/UnitTest.cs

@@ -0,0 +1,44 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OrmTest
+{
+    internal class Unitdfafaaa
+    {
+        public static void Init() 
+        {
+            var db = NewUnitTest.Db;
+            db.CodeFirst.InitTables<Invoice>();
+            var result =   db.Updateable<Invoice>(new Invoice() { })
+
+                                     .WhereColumns(c => new { c.comp_code, c.adi_order, c.invoice_no, c.cust_po_no })
+
+                                     .UpdateColumns(u => new { u.customer_original_po })
+
+                                     .ExecuteCommandAsync().GetAwaiter().GetResult();
+        }
+        [SqlSugar.SugarTable("inv_master")]
+
+        public class Invoice
+
+        {
+
+            [SqlSugar.SugarColumn(IsIdentity = true)]
+
+            public long id { get; set; }
+
+            public string comp_code { get; set; } = "a";
+
+            public string adi_order { get; set; } = "a";
+
+            public string invoice_no { get; set; } = "a";
+
+            public string cust_po_no { get; set; } = "a";
+
+            public string customer_original_po { get; set; } = "a";
+
+        }
+    }
+}