entity 오류로인해 제거해야해서 . 제거전 백업

DBMigration/Services/MigrationService.cs

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+using Microsoft.Data.SqlClient;
+using Microsoft.SqlServer.Management.Smo;
+using DBMigration.Models;
+
+namespace DBMigration.Services
+{
+    public class MigrationService
+    {
+        private readonly DatabaseService _databaseService;
+
+        public MigrationService()
+        {
+            _databaseService = new DatabaseService();
+        }
+
+        public void MigrateTable(DatabaseObject table, ConnectionInfo source, ConnectionInfo target)
+        {
+            using (var sourceConn = new SqlConnection(source.GetConnectionString()))
+            using (var targetConn = new SqlConnection(target.GetConnectionString()))
+            {
+                sourceConn.Open();
+                targetConn.Open();
+
+                // 1. 테이블 생성 (인덱스 포함)
+                ExecuteScript(table.Definition, targetConn);
+
+                // 2. IDENTITY와 트리거 비활성화
+                DisableIdentityAndTriggers(table, targetConn);
+
+                // 3. 데이터 복사
+                CopyData(table, sourceConn, targetConn);
+
+                // 4. IDENTITY와 트리거 재활성화
+                EnableIdentityAndTriggers(table, targetConn);
+
+                // 5. 통계 업데이트
+                UpdateStatistics(table, targetConn);
+            }
+        }
+
+        private void ExecuteScript(string script, SqlConnection connection)
+        {
+            using (var cmd = new SqlCommand(script, connection))
+            {
+                cmd.ExecuteNonQuery();
+            }
+        }
+
+        private void DisableIdentityAndTriggers(DatabaseObject table, SqlConnection connection)
+        {
+            var disableScript = $@"
+                -- IDENTITY 비활성화
+                SET IDENTITY_INSERT {table.FullName} ON;
+
+                -- 트리거 비활성화
+                DISABLE TRIGGER ALL ON {table.FullName};";
+
+            ExecuteScript(disableScript, connection);
+        }
+
+        private void EnableIdentityAndTriggers(DatabaseObject table, SqlConnection connection)
+        {
+            var enableScript = $@"
+                -- IDENTITY 활성화
+                SET IDENTITY_INSERT {table.FullName} OFF;
+
+                -- 트리거 활성화
+                ENABLE TRIGGER ALL ON {table.FullName};";
+
+            ExecuteScript(enableScript, connection);
+        }
+
+        private void CopyData(DatabaseObject table, SqlConnection source, SqlConnection target)
+        {
+            using (var cmd = new SqlCommand($"SELECT * FROM {table.FullName}", source))
+            using (var reader = cmd.ExecuteReader())
+            {
+                using (var bulkCopy = new SqlBulkCopy(target))
+                {
+                    bulkCopy.DestinationTableName = table.FullName;
+                    bulkCopy.WriteToServer(reader);
+                }
+            }
+        }
+
+        private void UpdateStatistics(DatabaseObject table, SqlConnection connection)
+        {
+            var updateStatsScript = $"UPDATE STATISTICS {table.FullName} WITH FULLSCAN;";
+            ExecuteScript(updateStatsScript, connection);
+        }
+    }
+}