diff --git a/Examples/base_entity/Program.cs b/Examples/base_entity/Program.cs
index 1efd22956..ed5d29d38 100644
--- a/Examples/base_entity/Program.cs
+++ b/Examples/base_entity/Program.cs
@@ -574,16 +574,16 @@ static void Main(string[] args)
                 //.UseSlaveWeight(10, 1, 1, 5)
 
 
-                //.UseConnectionString(FreeSql.DataType.Firebird, @"database=localhost:D:\fbdata\EXAMPLES.fdb;user=sysdba;password=123456;max pool size=5")
+                .UseConnectionString(FreeSql.DataType.Firebird, @"database=localhost:D:\fbdata\EXAMPLES.fdb;user=sysdba;password=123456;max pool size=5")
                 //.UseQuoteSqlName(false)
 
                 //.UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;min pool size=1;Max pool size=3;AllowLoadLocalInfile=true")
 
                 //.UseConnectionString(FreeSql.DataType.SqlServer, "Data Source=.;Integrated Security=True;Initial Catalog=freesqlTest;Pooling=true;Max Pool Size=3;TrustServerCertificate=true")
                 //.UseAdoConnectionPool(false)
-                .UseConnectionString(FreeSql.DataType.PostgreSQL, "Host=127.0.0.1;Port=5432;Username=postgres;Password=123456;Database=tedb;Pooling=true;Maximum Pool Size=2")
+                //.UseConnectionString(FreeSql.DataType.PostgreSQL, "Host=127.0.0.1;Port=5432;Username=postgres;Password=123456;Database=tedb;Pooling=true;Maximum Pool Size=2")
                 ////.UseConnectionString(FreeSql.DataType.PostgreSQL, "Host=127.0.0.1;Port=5432;Username=postgres;Password=123456;Database=toc;Pooling=true;Maximum Pool Size=2")
-                .UseNameConvert(FreeSql.Internal.NameConvertType.ToLower)
+                //.UseNameConvert(FreeSql.Internal.NameConvertType.ToLower)
 
                 //.UseConnectionString(FreeSql.DataType.Oracle, "user id=user1;password=123456;data source=//127.0.0.1:1521/XE;Pooling=true;Max Pool Size=2")
                 //.UseNameConvert(FreeSql.Internal.NameConvertType.ToUpper)
@@ -619,6 +619,8 @@ static void Main(string[] args)
             BaseEntity.Initialization(fsql, () => _asyncUow.Value);
             #endregion
 
+            fsql.CodeFirst.SyncStructure<Account>();
+
 
             var dbpars = new List<DbParameter>();
 
@@ -3310,6 +3312,9 @@ public partial class ProjectItem
 
 }
 
+/// <summary>
+/// 账户
+/// </summary>
 [Table(Name = "t_account")]
 public class Account
 {
diff --git a/Examples/base_entity/base_entity.xml b/Examples/base_entity/base_entity.xml
index 73179bc31..f64b46f9d 100644
--- a/Examples/base_entity/base_entity.xml
+++ b/Examples/base_entity/base_entity.xml
@@ -331,6 +331,11 @@
             名称
             </summary>
         </member>
+        <member name="T:Account">
+            <summary>
+            账户
+            </summary>
+        </member>
         <member name="T:EMSServerModel.Model.Role">
             <summary>
             角色表
diff --git a/Providers/FreeSql.Provider.Firebird/FirebirdCodeFirst.cs b/Providers/FreeSql.Provider.Firebird/FirebirdCodeFirst.cs
index 9994cc0cd..7a7fa009f 100644
--- a/Providers/FreeSql.Provider.Firebird/FirebirdCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Firebird/FirebirdCodeFirst.cs
@@ -268,9 +268,9 @@ from rdb$indices d
                         sb.Remove(sb.Length - 2, 2).Append(");\r\n");
                     }
                 }
-                var dbcomment = string.Concat(_orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(@" select trim(rdb$external_description) from rdb$relations where rdb$system_flag=0 and trim(rdb$relation_name) = {0}", tbname)));
+                var dbcomment = string.Concat(_orm.Ado.ExecuteScalar(CommandType.Text, _commonUtils.FormatSql(@" select trim(rdb$description) from rdb$relations where rdb$system_flag=0 and trim(rdb$relation_name) = {0}", tbname)));
                 if (dbcomment != (tb.Comment ?? ""))
-                    sb.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName(tbname)).Append(" COMMENT ").Append(" ").Append(_commonUtils.FormatSql("{0}", tb.Comment ?? "")).Append(";\r\n");
+                    sb.Append("COMMENT ON TABLE ").Append(_commonUtils.QuoteSqlName(tbname)).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tb.Comment ?? "")).Append(";\r\n");
             }
             return sb.Length == 0 ? null : sb.ToString();
         }