从山证v2.3.0拷贝

2024-05-09 14:06:26 +08:00
parent 566ff33259
commit f9d8a256a6
4471 changed files with 1203456 additions and 9 deletions
@@ -0,0 +1,29 @@
+using System.Linq.Expressions;
+
+namespace YLErp.Modules.TradeModule.QueryModule
+{
+    public class BatchGetTradeRelationDataService<T> where T : DBModelBase
+    {
+        public List<T> GetListByWhere(Expression<Func<T, bool>> expression, DbSet<T> dataSet, int batchSize = 500)
+        {
+            var result = new List<T>();
+            var newExpression = expression;
+            while (true)
+            {
+                var list = dataSet.AsNoTracking().Where(newExpression).OrderBy(p => p.id).Take(batchSize).ToList();
+                if (list != null && list.Count > 0)
+                {
+                    result.AddRange(list);
+                }
+                if (list == null || list.Count < batchSize)
+                {
+                    break;
+                }
+                var maxId = list.Max(p => p.id);
+                newExpression = expression.And(p => p.id > maxId);
+            }
+            return result;
+        }
+
+    }
+}