Performance optimization

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/UpdateBuilder.cs

@@ -350,6 +350,10 @@ namespace SqlSugar
                 {
                     return "N'" + value.ToString().ToSqlFilter() + "'";
                 }
+                else if (type==UtilConstants.IntType||type==UtilConstants.LongType)
+                {
+                    return value;
+                }
                 else
                 {
                     return "N'" + value.ToString() + "'";

Src/Asp.Net/SqlSugar/Abstract/UpdateProvider/UpdateableHelper.cs

@@ -191,6 +191,7 @@ namespace SqlSugar
                     DbColumnName = GetDbColumnName(column.PropertyName),
                     PropertyName = column.PropertyName,
                     PropertyType = UtilMethods.GetUnderType(column.PropertyInfo),
+                    SqlParameterDbType = column.SqlParameterDbType,
                     TableId = i
                 };
                 if (columnInfo.PropertyType.IsEnum() && columnInfo.Value != null)

Src/Asp.Net/SqlSugar/Entities/DbColumnInfo.cs

@@ -25,5 +25,6 @@ namespace SqlSugar
         internal bool IsJson { get;  set; }
         public bool? IsUnsigned { get; set; }
         public int CreateTableFieldSort { get; set; }
+        internal object SqlParameterDbType { get;  set; }
     }
 }

Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerUpdateBuilder.cs

@@ -2,11 +2,93 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
 namespace SqlSugar
 {
     public class SqlServerUpdateBuilder: UpdateBuilder
     {
+        protected override string TomultipleSqlString(List<IGrouping<int, DbColumnInfo>> groupList)
+        {
+            Check.Exception(PrimaryKeys == null || PrimaryKeys.Count == 0, " Update List<T> need Primary key");
+            int pageSize = 200;
+            int pageIndex = 1;
+            int totalRecord = groupList.Count;
+            int pageCount = (totalRecord + pageSize - 1) / pageSize;
+            StringBuilder batchUpdateSql = new StringBuilder();
+            while (pageCount >= pageIndex)
+            {
+                StringBuilder updateTable = new StringBuilder();
+                string setValues = string.Join(",", groupList.First().Where(it => it.IsPrimarykey == false && (it.IsIdentity == false || (IsOffIdentity && it.IsIdentity))).Select(it =>
+                {
+                    if (SetValues.IsValuable())
+                    {
+                        var setValue = SetValues.Where(sv => sv.Key == Builder.GetTranslationColumnName(it.DbColumnName));
+                        if (setValue != null && setValue.Any())
+                        {
+                            return setValue.First().Value;
+                        }
+                    }
+                    var result = string.Format("S.{0}=T.{0}", Builder.GetTranslationColumnName(it.DbColumnName));
+                    return result;
+                }));
+                batchUpdateSql.AppendFormat(SqlTemplateBatch.ToString(), setValues, GetTableNameStringNoWith, TableWithString);
+                int i = 0;
+                foreach (var columns in groupList.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList())
+                {
+                    var isFirst = i == 0;
+                    if (!isFirst)
+                    {
+                        updateTable.Append(SqlTemplateBatchUnion);
+                    }
+                    updateTable.Append("\r\n SELECT " + string.Join(",", columns.Select(it => string.Format(base.SqlTemplateBatchSelect, GetValue(it), Builder.GetTranslationColumnName(it.DbColumnName)))));
+                    ++i;
+                }
+                pageIndex++;
+                updateTable.Append("\r\n");
+                string whereString = null;
+                if (this.WhereValues.HasValue())
+                {
+                    foreach (var item in WhereValues)
+                    {
+                        var isFirst = whereString == null;
+                        whereString += (isFirst ? null : " AND ");
+                        whereString += Regex.Replace(item, "\\" + this.Builder.SqlTranslationLeft, "S." + this.Builder.SqlTranslationLeft);
+                    }
+                }
+                if (PrimaryKeys.HasValue())
+                {
+                    foreach (var item in PrimaryKeys)
+                    {
+                        var isFirst = whereString == null;
+                        whereString += (isFirst ? null : " AND ");
+                        whereString += string.Format("S.{0}=T.{0}", Builder.GetTranslationColumnName(item));
+                    }
+                }
+                batchUpdateSql.AppendFormat(SqlTemplateJoin, updateTable, whereString);
+            }
+            return batchUpdateSql.ToString();
+        }
+
+        private object GetValue(DbColumnInfo it)
+        {
+            if (it.SqlParameterDbType!=null&&it.SqlParameterDbType.Equals(System.Data.DbType.AnsiString))
+            {
+                var value = FormatValue(it.Value);
+                if (value is string&&value.ObjToString().Contains("N'"))
+                {
+                    return value.ObjToString().TrimStart('N');
+                }
+                else 
+                {
+                    return value;
+                }
+            }
+            else
+            {
+                return FormatValue(it.Value);
+            }
+        }
     }
 }