diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/FastestProvider/Private.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/FastestProvider/Private.cs
index 3b1379795..0ce09669a 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/FastestProvider/Private.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/FastestProvider/Private.cs
@@ -151,7 +151,7 @@ namespace SqlSugar
                     return queryable.AS(AsName).Where(it => false).Select("*").ToDataTable();
                 }
             }
-            );
+            ).Copy();
             var temColumnsList = tempDataTable.Columns.Cast<DataColumn>().Select(it => it.ColumnName.ToLower()).ToList();
             var columns = dt.Columns.Cast<DataColumn>().Where(it => temColumnsList.Contains(it.ColumnName.ToLower())).ToList();
             foreach (DataRow item in dt.Rows)
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Oracle/OracleProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Oracle/OracleProvider.cs
index 45dc76cca..a34d63d43 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Oracle/OracleProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Oracle/OracleProvider.cs
@@ -172,6 +172,11 @@ namespace SqlSugar
                     sqlParameter.DbType = System.Data.DbType.AnsiStringFixedLength;
                     sqlParameter.Value = parameter.Value;
                 }
+                else if (parameter.DbType == System.Data.DbType.AnsiString)
+                {
+                    sqlParameter.DbType = System.Data.DbType.AnsiString;
+                    sqlParameter.Value = parameter.Value;
+                }
                 else
                 {
                     if (parameter.Value != null && parameter.Value.GetType() == UtilConstants.GuidType)