XCode新增数据转换功能（导数据）

用法：

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DAL.AddConnStr("xxgk", "Data Source=192.168.1.21;Initial Catalog=信息公开;user id=sa;password=Pass@word", null, "mssql"); var dal = DAL.Create("xxgk");   DAL.AddConnStr("xxgk2", "Data Source=XXGK.db;Version=3;", null, "sqlite"); File.Delete("XXGK.db");   //DAL.ShowSQL = false;   var etf = new EntityTransform(); etf.SrcConn = "xxgk"; etf.DesConn = "xxgk2"; etf.AllowInsertIdentity = true; etf.TableNames.Remove("PubInfoLog"); //etf.OnTransformTable += (s, e) => { if (e.Arg.Name == "")e.Arg = null; }; var rs = etf.Transform(); Console.WriteLine("共转移：{0}", rs);

其实你也可以自己实现，XCode内部代码如下：

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using System; using System.Collections.Generic; using NewLife; using NewLife.Collections; using NewLife.Log; #if !NET4 using NewLife.Reflection; #endif using XCode.DataAccessLayer;   namespace XCode.Transform {     /// <summary>实体转换</summary>     public class EntityTransform     {         #region 属性         private String _SrcConn;         /// <summary>源</summary>         public String SrcConn { get { return _SrcConn; } set { _SrcConn = value; } }           private String _DesConn;         /// <summary>目的</summary>         public String DesConn { get { return _DesConn; } set { _DesConn = value; } }           private ICollection<String> _TableNames;         /// <summary>要导数据的表，为空表示全部</summary>         public ICollection<String> TableNames         {             get             {                 if (_TableNames == null)                 {                     _TableNames = new HashSet<String>(StringComparer.OrdinalIgnoreCase);                     if (!String.IsNullOrEmpty(SrcConn))                     {                         foreach (var item in DAL.Create(SrcConn).Tables)                         {                             _TableNames.Add(item.Name);                         }                     }                 }                 return _TableNames;             }             set { _TableNames = value; }         }           private Int32 _BatchSize = 1000;         /// <summary>每批处理多少行数据，默认1000</summary>         public Int32 BatchSize { get { return _BatchSize; } set { _BatchSize = value; } }           private Boolean _AllowInsertIdentity;         /// <summary>是否允许插入自增列</summary>         public Boolean AllowInsertIdentity { get { return _AllowInsertIdentity; } set { _AllowInsertIdentity = value; } }         #endregion           #region 方法         /// <summary>把一个链接的数据全部导入到另一个链接</summary>         /// <returns></returns>         public Int32 Transform()         {             var dal = DAL.Create(SrcConn);               var tables = dal.Tables;             tables.RemoveAll(t => t.IsView);             var tns = TableNames;             if (tns != null && tns.Count > 0) tables.RemoveAll(t => !tns.Contains(t.Name) && !tns.Contains(t.Alias));               var total = 0;             foreach (var item in tables)             {                 if (OnTransformTable != null)                 {                     var e = new EventArgs<IDataTable>(item);                     OnTransformTable(this, e);                     if (e.Arg == null) continue;                 }                   total += TransformTable(dal.CreateOperate(item.Name));             }               return total;         }           /// <summary>把一个表的数据全部导入到另一个表</summary>         /// <param name="eop">实体操作者。</param>         /// <param name="getData">用于获取数据的委托</param>         /// <returns></returns>         public Int32 TransformTable(IEntityOperate eop, Func<Int32, Int32, IEntityList> getData = null)         {             var name = eop.TableName;             var count = eop.Count;             if (getData == null) getData = (start, max) => eop.FindAll(null, null, null, start, max);               // 在目标链接上启用事务保护             eop.ConnName = DesConn;             eop.BeginTransaction();             try             {                 XTrace.WriteLine("{0} 共 {1}", name, count);                   // 允许插入自增                 var oldII = eop.AllowInsertIdentity;                 if (AllowInsertIdentity) eop.AllowInsertIdentity = true;                 // 关闭SQL日志                 var oldShowSql = DAL.ShowSQL;                 DAL.ShowSQL = false;                   var total = 0;                 var index = 0;                 while (true)                 {                     eop.ConnName = SrcConn;                     var list = getData(index, BatchSize);                     if (list == null || list.Count < 1) break;                     index += list.Count;                       // 处理事件，外部可以修改实体数据                     if (OnTransformEntity != null)                     {                         var e = new EventArgs<IEntity>(null);                         foreach (var entity in list)                         {                             e.Arg = entity;                             OnTransformEntity(this, e);                         }                     }                       eop.ConnName = DesConn;                     var rs = list.Insert(true);                     XTrace.WriteLine("{0} 导入 {1}/{2} {3:p}", name, index, count, (Double)index / count);                       total += rs;                 }                 DAL.ShowSQL = oldShowSql;                 // 关闭插入自增                 if (AllowInsertIdentity) eop.AllowInsertIdentity = oldII;                   // 在目标链接上启用事务保护                 eop.ConnName = DesConn;                 eop.Commit();                   return total;             }             catch (Exception ex)             {                 XTrace.WriteLine("{0} 错误 {1}", name, ex.Message);                 // 在目标链接上启用事务保护                 eop.ConnName = DesConn;                 eop.Rollback();                 throw;             }         }         #endregion           #region 事件         /// <summary>转换表时触发。如果参数被置空，表示不转换该表</summary>         public event EventHandler<EventArgs<IDataTable>> OnTransformTable;           ///// <summary>转换实体时触发</summary>         //public event EventHandler<EventArgs<IEntity>> OnTransformEntity;           /// <summary>转换实体时触发</summary>         public event EventHandler<EventArgs<IEntity>> OnTransformEntity;         #endregion     } }

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