From e882269122b3b8f0df008016c1c2ef20960664b0 Mon Sep 17 00:00:00 2001
From: xieyidong <xieyidong@laiye.com>
Date: Wed, 13 Nov 2024 16:54:03 +0800
Subject: [PATCH] =?UTF-8?q?fix:=E4=BF=AE=E5=A4=8D=E5=8D=87=E7=BA=A7?=
 =?UTF-8?q?=E8=BE=BE=E6=A2=A6=E6=95=B0=E6=8D=AE=E5=BA=93=E7=9A=84=E8=A1=A8?=
 =?UTF-8?q?=E7=BB=93=E6=9E=84=E6=97=B6=E7=94=B1=E4=BA=8Eselect=E4=B8=AD?=
 =?UTF-8?q?=E5=AD=97=E7=AC=A6=E4=B8=B2=E7=B2=BE=E8=AF=BB=E9=97=AE=E9=A2=98?=
 =?UTF-8?q?=EF=BC=8C=E8=80=8C=E5=AF=BC=E8=87=B4=E5=AD=97=E7=AC=A6=E4=B8=B2?=
 =?UTF-8?q?=E6=88=AA=E5=8F=96=E7=9A=84=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Dameng/DamengCodeFirstTest.cs             | 69 +++++++++++++++++++
 .../DamengCodeFirst.cs                        | 11 +++
 2 files changed, 80 insertions(+)

diff --git a/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
index 01dbc0221..481b51094 100644
--- a/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
@@ -454,5 +454,74 @@ class TableAllType
 
         public enum TableAllTypeEnumType1 { e1, e2, e3, e5 }
         [Flags] public enum TableAllTypeEnumType2 { f1, f2, f3 }
+
+
+
+        [Fact]
+        public void UpgradeTableStructure()
+        {
+            g.dameng.CodeFirst.SyncStructure<TableUpgradeTest>();
+
+            g.dameng.Delete<TableUpgradeTest>()
+                .Where(item => 1 == 1)
+                .ExecuteAffrows();
+
+            var text = new StringBuilder();
+            var temp = "1234567890哈";
+            for (int i = 0; i < 3000 - temp.Length; i+= temp.Length)
+            {
+                text.Append(temp);
+            }
+
+            var mode = new TableUpgradeTest 
+            {
+                Name = "1234560123456012哈哈哈哈哈呵呵_123123",
+                Text = text.ToString(),
+                Text2 = "呵呵呵Test123123123"
+            };
+
+            mode.Id = g.dameng.Insert(mode)
+                .ExecuteIdentity();
+
+            // 第二次进行数据库结果同步
+            var sql = g.dameng.CodeFirst.GetComparisonDDLStatements<TableUpgradeTest>();
+            g.dameng.Ado.ExecuteNonQuery(sql);
+            //g.dameng.CodeFirst.SyncStructure<TableSubString>();
+
+            var resultMode = g.dameng.Select<TableUpgradeTest>()
+                .Where(item => item.Id == mode.Id)
+                .First();
+
+            Assert.Equal(mode.Name, resultMode?.Name);
+            Assert.Equal(mode.Text, resultMode?.Text);
+            Assert.Equal(mode.Text2, resultMode?.Text2);
+            Assert.Equal(mode.Text3, resultMode?.Text3);
+
+        }
+
+        [Table(Name = "tb_upgrade_test")]
+        public class TableUpgradeTest
+        {
+            [Column(Name = "id", IsPrimary = true, IsIdentity = true)]
+            public long Id { get; set; }
+
+
+            [Column(Name = "name", StringLength = 31, IsNullable = false)]
+            public string Name { get; set; }
+
+            [Column(Name = "text", StringLength = 32767, IsNullable = false)]
+            public string Text { get; set; }
+
+            [Column(Name = "number_test", IsNullable = false)]
+            public int TestNumber { get; set; }
+
+            [Column(Name = "text2", StringLength = 63)]
+            public string Text2 { get; set; }
+
+
+            [Column(Name = "text3")]
+            public string Text3 { get; set; }
+        }
+
     }
 }
diff --git a/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs b/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
index 664ddb376..f6142938e 100644
--- a/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
@@ -358,6 +358,17 @@ and a.owner in ({0}) and a.table_name in ({1})
                         if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false)
                         {
                             var dbtypeNoneNotNull = Regex.Replace(tbcol.Attribute.DbType, @"(NOT\s+)?NULL", "");
+
+                            var charMatch = Regex.Match(dbtypeNoneNotNull, "(N?)VARCHAR(2?)\\((?<precision>[0-9]+)\\)");
+
+                            if(charMatch != null)
+                            {
+                                if (ushort.TryParse(charMatch.Groups["precision"]?.Value, out var precision))
+                                {
+                                    dbtypeNoneNotNull = Regex.Replace(dbtypeNoneNotNull, $"\\(({precision})\\)", $"");
+                                }
+                            }
+
                             insertvalue = $"cast({insertvalue} as {dbtypeNoneNotNull})";
                         }
                         if (tbcol.Attribute.IsNullable != tbstructcol.is_nullable)