diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
index c04b267b3..f0518e03d 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
@@ -110,6 +110,10 @@ namespace SqlSugar
             {
                 this.DbType = System.Data.DbType.Byte;
             }
+            else if (type == UtilConstants.SByteType)
+            {
+                this.DbType = System.Data.DbType.SByte;
+            }
             else if (type == UtilConstants.FloatType)
             {
                 this.DbType = System.Data.DbType.Single;
diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
index 46ed0dd72..b8aac2339 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
@@ -72,6 +72,10 @@ namespace SqlSugar
             var parameter = model.Args[0];
             var parameter2 = model.Args[1];
             var parameter3 = model.Args[2];
+            if (parameter3.MemberValue.ObjToString() == DateType.Weekday.ObjToString()) 
+            {
+                parameter3.MemberValue = "Week";
+            }
             return string.Format(" (TIMESTAMPDIFF({2},{0},{1})=0) ", parameter.MemberName, parameter2.MemberName, parameter3.MemberValue);
         }