diff --git a/FreeSql.DbContext/FreeSql.DbContext.xml b/FreeSql.DbContext/FreeSql.DbContext.xml
index ddd18378..28fdb213 100644
--- a/FreeSql.DbContext/FreeSql.DbContext.xml
+++ b/FreeSql.DbContext/FreeSql.DbContext.xml
@@ -110,13 +110,6 @@
             清空状态数据
             </summary>
         </member>
-        <member name="M:FreeSql.DbSet`1.RemoveAsync(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">
-            <summary>
-            根据 lambda 条件删除数据
-            </summary>
-            <param name="predicate"></param>
-            <returns></returns>
-        </member>
         <member name="M:FreeSql.DbSet`1.Add(`0)">
             <summary>
             添加
@@ -211,15 +204,6 @@
             </summary>
             <returns></returns>
         </member>
-        <member name="M:FreeSql.FreeSqlRepositoryDependencyInjection.AddFreeRepository(Microsoft.Extensions.DependencyInjection.IServiceCollection,System.Action{FreeSql.FluentDataFilter},System.Reflection.Assembly[])">
-            <summary>
-            批量注入 Repository，可以参考代码自行调整
-            </summary>
-            <param name="services"></param>
-            <param name="globalDataFilter"></param>
-            <param name="assemblies"></param>
-            <returns></returns>
-        </member>
         <member name="M:FreeSql.IBaseRepository.AsType(System.Type)">
             <summary>
             动态Type，在使用 Repository&lt;object&gt; 后使用本方法，指定实体类型
diff --git a/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
index 68b9de63..baf47d01 100644
--- a/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
@@ -11,6 +11,51 @@ namespace FreeSql.Tests.Oracle
 {
     public class OracleCodeFirstTest
     {
+        [Fact]
+        public void NClob_StringLength_1()
+        {
+            var str1 = string.Join(",", Enumerable.Range(0, 10000).Select(a => "�������"));
+
+            var item1 = new TS_NCLB02 { Data = str1 };
+            Assert.Equal(1, g.oracle.Insert(item1).ExecuteAffrows());
+
+            var item2 = g.oracle.Select<TS_NCLB02>().Where(a => a.Id == item1.Id).First();
+            Assert.Equal(str1, item2.Data);
+
+            //NoneParameter
+            item1 = new TS_NCLB02 { Data = str1 };
+            Assert.Throws<OracleException>(() => g.oracle.Insert(item1).NoneParameter().ExecuteAffrows());
+            //Oracle.ManagedDataAccess.Client.OracleException:��ORA-01704: �ַ�������̫����
+        }
+        class TS_NCLB02
+        {
+            public Guid Id { get; set; }
+            [Column(StringLength = - 1)]
+            public string Data { get; set; }
+        }
+
+        [Fact]
+        public void NClob()
+        {
+            var str1 = string.Join(",", Enumerable.Range(0, 10000).Select(a => "�������"));
+
+            var item1 = new TS_NCLB01 { Data = str1 };
+            Assert.Equal(1, g.oracle.Insert(item1).ExecuteAffrows());
+
+            var item2 = g.oracle.Select<TS_NCLB01>().Where(a => a.Id == item1.Id).First();
+            Assert.Equal(str1, item2.Data);
+
+            //NoneParameter
+            item1 = new TS_NCLB01 { Data = str1 };
+            Assert.Throws<OracleException>(() => g.oracle.Insert(item1).NoneParameter().ExecuteAffrows());
+            //Oracle.ManagedDataAccess.Client.OracleException:��ORA-01704: �ַ�������̫����
+        }
+        class TS_NCLB01
+        {
+            public Guid Id { get; set; }
+            [Column(DbType = "nclob")]
+            public string Data { get; set; }
+        }
         [Fact]
         public void Clob()
         {
diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index efdb4a8a..c77baea9 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -223,6 +223,9 @@ namespace FreeSql.Internal
                             else colattr.DbType = Regex.Replace(colattr.DbType, charPatten, $"$1({strlen})");
                             break;
                         case DataType.Oracle:
+                            if (strlen < 0) colattr.DbType = "NCLOB"; //v1.3.2+ https://github.com/dotnetcore/FreeSql/issues/259
+                            else colattr.DbType = Regex.Replace(colattr.DbType, charPatten, $"$1({strlen})");
+                            break;
                         case DataType.OdbcOracle:
                         case DataType.OdbcDameng:
                             if (strlen < 0) colattr.DbType = Regex.Replace(colattr.DbType, charPatten, $"$1(4000)");