Oracle support DbType.Nvarchar2

Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs

@@ -11,6 +11,7 @@ namespace SqlSugar
     {
         public bool IsRefCursor { get; set; }
         public bool IsClob { get; set; }
+        public bool IsNvarchar2 { get; set; }
         public SugarParameter(string name, object value)
         {
             this.Value = value;

Src/Asp.Net/SqlSugar/Realization/Oracle/OracleProvider.cs

@@ -169,6 +169,10 @@ namespace SqlSugar
                 {
                     sqlParameter.OracleDbType = OracleDbType.RefCursor;
                 }
+                if (parameter.IsNvarchar2&& parameter.DbType==System.Data.DbType.String)
+                {
+                    sqlParameter.OracleDbType = OracleDbType.NVarchar2;
+                }
                 if (parameter.IsClob)
                 {
                     sqlParameter.OracleDbType = OracleDbType.Clob;