用法：
其实你也可以自己实现，XCode内部代码如下：
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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);
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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 !NET4using NewLife.Reflection;
#endifusing 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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