using System;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Web;
using NewLife;
using NewLife.Collections;
using NewLife.Configuration;
using NewLife.Log;
using NewLife.Threading;
using XCode.Cache;
using XCode.Configuration;
using XCode.DataAccessLayer;
using XCode.Model;
/*
* 检查表结构流程:
* Create 创建实体会话,此时不能做任何操作,原则上各种操作要延迟到最后
* Query/Execute 查询修改数据
* WaitForInitData 等待数据初始化
* Monitor.TryEnter 只会被调用一次,后续线程进入需要等待
* CheckModel lock阻塞检查模型架构
* CheckTable 检查表
* FixIndexName 修正索引名称
* SetTables 设置表架构
* CheckTableAync 异步检查表
* InitData
* Monitor.Exit 初始化完成
* Count 总记录数
* CheckModel
* WaitForInitData
*
* 缓存更新规则如下:
* 1、直接执行SQL语句进行新增、编辑、删除操作,强制清空实体缓存、单对象缓存
* 2、无论独占模式或非独占模式,使用实体对象或实体列表进行的对象操作,不再主动清空缓存。
* 3、事务提交时对缓存的操作参考前两条
* 4、事务回滚时一律强制清空缓存(因为无法判断什么异常触发回滚,回滚之前对缓存进行了哪些修改无法记录)
* 5、强制清空缓存时传入执行更新操作记录数,如果存在更新操作清除实体缓存、单对象缓存。
* 6、强制清空缓存时如果只有新增和删除操作,先判断当前实体类有无使用实体缓存,如果使用了实体缓存证明当前实体总记录数不大,
* 清空实体缓存的同时清空单对象缓存,确保单对象缓存和实体缓存引用同一实体对象;没有实体缓存则不对单对象缓存进行清空操作。
* */
namespace XCode
{
/// <summary>实体会话。每个实体类、连接名和表名形成一个实体会话</summary>
public class EntitySession<TEntity> : IEntitySession where TEntity : Entity<TEntity>, new()
{
#region 属性
private String _ConnName;
/// <summary>连接名</summary>
public String ConnName { get { return _ConnName; } private set { _ConnName = value; _Key = null; } }
private String _TableName;
/// <summary>表名</summary>
public String TableName { get { return _TableName; } private set { _TableName = value; _Key = null; } }
private String _Key;
/// <summary>用于标识会话的键值</summary>
public String Key { get { return _Key ?? (_Key = String.Format("{0}$$${1}", ConnName, TableName)); } }
#endregion
#region 构造
private EntitySession()
{
//Queue = new EntityQueue { Session = this };
}
private static DictionaryCache<String, EntitySession<TEntity>> _es = new DictionaryCache<string, EntitySession<TEntity>>(StringComparer.OrdinalIgnoreCase);
/// <summary>创建指定表名连接名的会话</summary>
/// <param name="connName"></param>
/// <param name="tableName"></param>
/// <returns></returns>
public static EntitySession<TEntity> Create(String connName, String tableName)
{
if (String.IsNullOrEmpty(connName)) throw new ArgumentNullException("connName");
if (String.IsNullOrEmpty(tableName)) throw new ArgumentNullException("tableName");
// 字符串连接有较大性能损耗
var key = connName + "$$$" + tableName;
return _es.GetItem<String, String>(key, connName, tableName, (k, c, t) => new EntitySession<TEntity> { ConnName = c, TableName = t });
}
#endregion
#region 主要属性
private Type ThisType { get { return typeof(TEntity); } }
/// <summary>表信息</summary>
TableItem Table { get { return TableItem.Create(ThisType); } }
IEntityOperate Operate { get { return EntityFactory.CreateOperate(ThisType); } }
private DAL _Dal;
/// <summary>数据操作层</summary>
public DAL Dal { get { return _Dal ?? (_Dal = DAL.Create(ConnName)); } }
private String _FormatedTableName;
/// <summary>已格式化的表名,带有中括号等</summary>
public virtual String FormatedTableName { get { return _FormatedTableName ?? (_FormatedTableName = Dal.Db.FormatName(TableName)); } }
private EntitySession<TEntity> _Default;
/// <summary>该实体类的默认会话。</summary>
private EntitySession<TEntity> Default
{
get
{
if (_Default != null) return _Default;
if (ConnName == Table.ConnName && TableName == Table.TableName)
_Default = this;
else
_Default = Create(Table.ConnName, Table.TableName);
return _Default;
}
}
#endregion
#region 数据初始化
/// <summary>记录已进行数据初始化</summary>
Boolean hasCheckInitData = false;
Int32 initThread = 0;
Object _wait_lock = new Object();
/// <summary>检查并初始化数据。参数等待时间为0表示不等待</summary>
/// <param name="ms">等待时间,-1表示不限,0表示不等待</param>
/// <returns>如果等待,返回是否收到信号</returns>
public Boolean WaitForInitData(Int32 ms = 1000)
{
// 已初始化
if (hasCheckInitData) return true;
//!!! 一定一定小心堵塞的是自己
if (initThread == Thread.CurrentThread.ManagedThreadId) return true;
if (!Monitor.TryEnter(_wait_lock, ms))
{
//if (DAL.Debug) DAL.WriteLog("开始等待初始化{0}数据{1}ms,调用栈:{2}", name, ms, XTrace.GetCaller());
if (DAL.Debug) DAL.WriteLog("等待初始化{0}数据{1:n0}ms失败", ThisType.Name, ms);
return false;
}
initThread = Thread.CurrentThread.ManagedThreadId;
try
{
// 已初始化
if (hasCheckInitData) return true;
var name = ThisType.Name;
if (name == TableName)
name = String.Format("{0}@{1}", ThisType.Name, ConnName);
else
name = String.Format("{0}#{1}@{2}", ThisType.Name, TableName, ConnName);
// 如果该实体类是首次使用检查模型,则在这个时候检查
try
{
CheckModel();
}
catch { }
// 输出调用者,方便调试
//if (DAL.Debug) DAL.WriteLog("初始化{0}数据,调用栈:{1}", name, XTrace.GetCaller());
//if (DAL.Debug) DAL.WriteLog("初始化{0}数据", name);
//var init = Config.GetConfig<Boolean>("XCode.InitData", true);
var init = Setting.Current.InitData;
if (init)
{
try
{
var entity = Operate.Default as EntityBase;
if (entity != null) entity.InitData();
}
catch (Exception ex)
{
if (XTrace.Debug) XTrace.WriteLine("初始化数据出错!" + ex.ToString());
}
}
return true;
}
finally
{
initThread = 0;
hasCheckInitData = true;
Monitor.Exit(_wait_lock);
}
}
#endregion
#region 架构检查
private void CheckTable()
{
//if (Dal.CheckAndAdd(TableName)) return;
#if DEBUG
DAL.WriteLog("开始{2}检查表[{0}/{1}]的数据表架构……", Table.DataTable.Name, Dal.Db.DbType, Setting.Current.Negative.CheckOnly ? "异步" : "同步");
#endif
var sw = new Stopwatch();
sw.Start();
try
{
// 检查新表名对应的数据表
var table = Table.DataTable;
// 克隆一份,防止修改
table = table.Clone() as IDataTable;
if (table != null && table.TableName != TableName)
{
FixIndexName(table);
table.TableName = TableName;
}
var set = new NegativeSetting
{
CheckOnly = Setting.Current.Negative.CheckOnly,
NoDelete = Setting.Current.Negative.NoDelete
};
// 对于分库操作,强制检查架构,但不删除数据
if (Default != this)
{
set.CheckOnly = false;
set.NoDelete = true;
}
Dal.SetTables(set, table);
}
finally
{
sw.Stop();
#if DEBUG
DAL.WriteLog("检查表[{0}/{1}]的数据表架构耗时{2:n0}ms", Table.DataTable.Name, Dal.DbType, sw.Elapsed.TotalMilliseconds);
#endif
}
}
void FixIndexName(IDataTable table)
{
// 修改一下索引名,否则,可能因为同一个表里面不同的索引冲突
if (table.Indexes != null)
{
foreach (var di in table.Indexes)
{
var sb = new StringBuilder();
sb.AppendFormat("IX_{0}", TableName);
foreach (var item in di.Columns)
{
sb.Append("_");
sb.Append(item);
}
di.Name = sb.ToString();
}
}
}
private Boolean IsGenerated { get { return ThisType.GetCustomAttribute<CompilerGeneratedAttribute>(true) != null; } }
Boolean _hasCheckModel = false;
readonly Object _checkLock = new Object();
/// <summary>检查模型。依据反向工程设置、是否首次使用检查、是否已常规检查等</summary>
private void CheckModel()
{
if (_hasCheckModel) return;
lock (_checkLock)
{
if (_hasCheckModel) return;
// 是否默认连接和默认表名,非默认则强制检查,并且不允许异步检查(异步检查会导致ConnName和TableName不对)
var def = Default;
if (def == this)
{
if (!Setting.Current.Negative.Enable ||
DAL.NegativeExclude.Contains(ConnName) ||
DAL.NegativeExclude.Contains(TableName) ||
IsGenerated)
{
_hasCheckModel = true;
return;
}
}
#if DEBUG
else
{
DAL.WriteLog("[{0}@{1}]非默认表名连接名,强制要求检查架构!", TableName, ConnName);
}
#endif
// 输出调用者,方便调试
//if (DAL.Debug) DAL.WriteLog("检查实体{0}的数据表架构,模式:{1},调用栈:{2}", ThisType.FullName, Table.ModelCheckMode, XTrace.GetCaller(1, 0, "\r\n<-"));
// CheckTableWhenFirstUse的实体类,在这里检查,有点意思,记下来
var mode = Table.ModelCheckMode;
if (DAL.Debug && mode == ModelCheckModes.CheckTableWhenFirstUse)
DAL.WriteLog("检查实体{0}的数据表架构,模式:{1}", ThisType.FullName, mode);
// 第一次使用才检查的,此时检查
var ck = mode == ModelCheckModes.CheckTableWhenFirstUse;
// 或者前面初始化的时候没有涉及的,也在这个时候检查
var dal = DAL.Create(ConnName);
if (!dal.HasCheckTables.Contains(TableName))
{
if (!ck)
{
dal.HasCheckTables.Add(TableName);
#if DEBUG
if (!ck && DAL.Debug) DAL.WriteLog("集中初始化表架构时没赶上,现在补上!");
#endif
ck = true;
}
}
else
ck = false;
if (ck)
{
// 打开了开关,并且设置为true时,使用同步方式检查
// 设置为false时,使用异步方式检查,因为上级的意思是不大关心数据库架构
if (!Setting.Current.Negative.CheckOnly || def != this)
CheckTable();
else
ThreadPoolX.QueueUserWorkItem(CheckTable);
}
_hasCheckModel = true;
}
}
#endregion
#region 缓存
private EntityCache<TEntity> _cache;
/// <summary>实体缓存</summary>
/// <returns></returns>
public EntityCache<TEntity> Cache
{
get
{
// 以连接名和表名为key,因为不同的库不同的表,缓存也不一样
if (_cache == null)
{
var ec = new EntityCache<TEntity> { ConnName = ConnName, TableName = TableName };
// 从默认会话复制参数
if (Default != this) ec.CopySettingFrom(Default.Cache);
//_cache = ec;
Interlocked.CompareExchange<EntityCache<TEntity>>(ref _cache, ec, null);
}
return _cache;
}
}
private ISingleEntityCache<Object, TEntity> _singleCache;
/// <summary>单对象实体缓存。
/// 建议自定义查询数据方法,并从二级缓存中获取实体数据,以抵消因初次填充而带来的消耗。
/// </summary>
public ISingleEntityCache<Object, TEntity> SingleCache
{
get
{
// 以连接名和表名为key,因为不同的库不同的表,缓存也不一样
if (_singleCache == null)
{
var sc = new SingleEntityCache<Object, TEntity>();
sc.ConnName = ConnName;
sc.TableName = TableName;
// 从默认会话复制参数
if (Default != this) sc.CopySettingFrom(Default.SingleCache);
Interlocked.CompareExchange<ISingleEntityCache<Object, TEntity>>(ref _singleCache, sc, null);
}
return _singleCache;
}
}
IEntityCache IEntitySession.Cache { get { return Cache; } }
ISingleEntityCache IEntitySession.SingleCache { get { return SingleCache; } }
/// <summary>总记录数,小于1000时是精确的,大于1000时缓存10秒</summary>
public Int32 Count { get { return (Int32)LongCount; } }
/// <summary>上一次记录数,用于衡量缓存策略,不受缓存清空</summary>
private Int64? _LastCount;
/// <summary>总记录数较小时,使用静态字段,较大时增加使用Cache</summary>
private Int64 _Count = -1L;
/// <summary>总记录数,小于1000时是精确的,大于1000时缓存10分钟</summary>
/// <remarks>
/// 1,检查静态字段,如果有数据且小于1000,直接返回,否则=>3
/// 2,如果有数据但大于1000,则返回缓存里面的有效数据
/// 3,来到这里,有可能是第一次访问,静态字段没有缓存,也有可能是大于1000的缓存过期
/// 4,检查模型
/// 5,根据需要查询数据
/// 6,如果大于1000,缓存数据
/// 7,检查数据初始化
/// </remarks>
public Int64 LongCount
{
get
{
var key = CacheKey;
// 当前缓存的值
Int64 n = _Count;
// 如果有缓存,则考虑返回吧
if (n >= 0)
{
// 等于0的时候也应该缓存,否则会一直查询这个表
if (n < 1000L) { return n; }
// 大于1000,使用HttpCache
Int64? k = (Int64?)HttpRuntime.Cache[key];
if (k != null && k.HasValue) return k.Value;
}
// 来到这里,有可能是第一次访问,静态字段没有缓存,也有可能是大于1000的缓存过期
CheckModel();
Int64 m = 0L;
// 小于1000的精确查询,大于1000的快速查询
if (n > -1L && n <= 1000L)
{
var sb = new SelectBuilder();
sb.Table = FormatedTableName;
WaitForInitData();
m = Dal.SelectCount(sb, new String[] { TableName });
}
else
{
// 第一次访问,SQLite的Select Count非常慢,数据大于阀值时,使用最大ID作为表记录数
var max = 0L;
if (Dal.DbType == DatabaseType.SQLite && Table.Identity != null)
{
// 除第一次外,将依据上一次记录数决定是否使用最大ID
if (_LastCount == null)
{
// 先查一下最大值
//max = Entity<TEntity>.FindMax(Table.Identity.ColumnName);
// 依赖关系FindMax=>FindAll=>Query=>InitData=>Meta.Count,所以不能使用
//if (DAL.Debug) DAL.WriteLog("第一次访问{0},SQLite的Select Count非常慢,数据大于阀值时,使用最大ID作为表记录数", ThisType.Name);
var builder = new SelectBuilder();
builder.Table = FormatedTableName;
builder.OrderBy = Table.Identity.Desc();
var ds = Dal.Select(builder, 0, 1, TableName);
if (ds.Tables[0].Rows.Count > 0)
max = Convert.ToInt64(ds.Tables[0].Rows[0][Table.Identity.ColumnName]);
}
else
max = _LastCount.Value;
}
// 100w数据时,没有预热Select Count需要3000ms,预热后需要500ms
if (max < 500000)
m = Dal.Session.QueryCountFast(TableName);
else
{
m = max;
// 异步查询弥补不足
ThreadPoolX.QueueUserWorkItem(() =>
{
_LastCount = _Count = Dal.Session.QueryCountFast(TableName);
if (_Count >= 1000) HttpRuntime.Cache.Insert(key, _Count, null, DateTime.Now.AddSeconds(10), System.Web.Caching.Cache.NoSlidingExpiration);
});
}
}
_Count = m;
_LastCount = m;
if (m >= 1000) HttpRuntime.Cache.Insert(key, m, null, DateTime.Now.AddSeconds(10), System.Web.Caching.Cache.NoSlidingExpiration);
// 先拿到记录数再初始化,因为初始化时会用到记录数,同时也避免了死循环
WaitForInitData();
return m;
}
private set
{
if (value == 0)
{
_LastCount = null;
_Count = 0;
HttpRuntime.Cache.Remove(CacheKey);
}
}
}
/// <summary>清除缓存</summary>
/// <param name="reason">原因</param>
/// <param name="isUpdateMode">是否执行更新实体操作</param>
/// <param name="isTransRoolback">是否在事务回滚时执行更新实体操作</param>
private void ClearCache(String reason, Boolean isUpdateMode, Boolean isTransRoolback)
{
// 无法判断事务回滚是由什么样的异常触发,缓存数据可能已被修改,所有强制清空缓存
//if (HoldCache && !isTransRoolback)
if (!isTransRoolback) // 非独占模式下也保持缓存,由缓存有效期设置来清空
{
if (_cache != null && _cache.Using)
{
/* 这里我先屏蔽,需要改动业务代码里是否使用实体缓存的代码,所以就不加这个判断了 */
// 在独占模式下,当实体记录数大于1000,清空实体缓存后不再使用
// 如果不清空,业务代码在记录数大于1000后不再调用实体缓存,就没有清空的机会了,
// 而且在独占模式或事务保护中实体的新增、编辑、删除操作会一直维护实体缓存
// http://www.newlifex.com/showtopic-1152.aspx
//if (Count > _cache.MaxCount)
//{
// _cache.Clear("实体记录数大于{0}条,销毁实体缓存!!!".FormatWith(_cache.MaxCount));
//}
}
}
else
{
ForceClearCache(reason, isUpdateMode);
}
}
/// <summary>清除缓存,直接执行SQl语句或事务回滚时使用</summary>
/// <param name="reason">原因</param>
/// <param name="isUpdateMode">是否执行更新实体操作</param>
/// <remarks>http://www.newlifex.com/showtopic-1216.aspx</remarks>
private void ForceClearCache(String reason, Boolean isUpdateMode)
{
var clearEntityCache = false;
if (_cache != null && _cache.Using)
{
clearEntityCache = true;
_cache.Clear(reason);
}
// 因为单对象缓存在实际应用场景中可能会非常庞大
// 添加、删除不再维护单对象缓存,新添加的会自动获取,删除的一直保留在内存中等待SingleCache的定时清理或RemoveFirst方法慢慢清除
// 如果清理了实体缓存证明当前实体数据量不大,也清除单对象缓存,尽量使单对象缓存的实体对象与实体缓存中的实体对象一致
if (isUpdateMode || clearEntityCache)
{
if (_singleCache != null && _singleCache.Using)
{
ThreadPoolX.QueueUserWorkItem(() =>
{
_singleCache.Clear(reason);
_singleCache.Initialize();
});
}
}
if (!isUpdateMode)
{
Int64 n = _Count;
if (n < 0L) { return; }
// 只有小于等于1000时才清空_Count,因为大于1000时它要作为HttpCache的见证
if (n > 1000L)
{
HttpRuntime.Cache.Remove(CacheKey);
}
else
{
_Count = -1L;
}
}
}
/// <summary>清除缓存</summary>
/// <param name="reason">原因</param>
public void ClearCache(String reason)
{
if (_cache != null && _cache.Using) { _cache.Clear(reason); }
if (_singleCache != null && _singleCache.Using) { _singleCache.Clear(reason); }
Int64 n = _Count;
if (n < 0L) { return; }
// 只有小于等于1000时才清空_Count,因为大于1000时它要作为HttpCache的见证
if (n < 1000L)
{
_Count = -1L;
}
else
{
HttpRuntime.Cache.Remove(CacheKey);
}
}
String CacheKey { get { return String.Format("{0}_{1}_{2}_Count", ConnName, TableName, ThisType.Name); } }
private Boolean _HoldCache = Setting.Current.Cache.Alone;
/// <summary>在数据修改时保持缓存,直到数据过期,独占数据库时默认打开,否则默认关闭</summary>
/// <remarks>实体缓存和单对象缓存能够自动维护更新数据,保持缓存数据最新,在普通CURD中足够使用</remarks>
public Boolean HoldCache
{
get { return _HoldCache; }
set
{
_HoldCache = value;
SingleCache.HoldCache = value;
}
}
#endregion
#region 数据库操作
void InitData() { WaitForInitData(); }
/// <summary>执行SQL查询,返回记录集</summary>
/// <param name="builder">SQL语句</param>
/// <param name="startRowIndex">开始行,0表示第一行</param>
/// <param name="maximumRows">最大返回行数,0表示所有行</param>
/// <returns></returns>
public virtual DataSet Query(SelectBuilder builder, Int32 startRowIndex, Int32 maximumRows)
{
InitData();
//builder.Table = FormatedTableName;
return Dal.Select(builder, startRowIndex, maximumRows, TableName);
}
/// <summary>查询</summary>
/// <param name="sql">SQL语句</param>
/// <returns>结果记录集</returns>
//[Obsolete("请优先考虑使用SelectBuilder参数做查询!")]
public virtual DataSet Query(String sql)
{
InitData();
return Dal.Select(sql, TableName);
}
/// <summary>查询记录数</summary>
/// <param name="builder">查询生成器</param>
/// <returns>记录数</returns>
public virtual Int32 QueryCount(SelectBuilder builder)
{
InitData();
//builder.Table = FormatedTableName;
return Dal.SelectCount(builder, new String[] { TableName });
}
/// <summary>根据条件把普通查询SQL格式化为分页SQL。</summary>
/// <remarks>
/// 因为需要继承重写的原因,在数据类中并不方便缓存分页SQL。
/// 所以在这里做缓存。
/// </remarks>
/// <param name="builder">查询生成器</param>
/// <param name="startRowIndex">开始行,0表示第一行</param>
/// <param name="maximumRows">最大返回行数,0表示所有行</param>
/// <returns>分页SQL</returns>
public virtual SelectBuilder PageSplit(SelectBuilder builder, Int32 startRowIndex, Int32 maximumRows)
{
//builder.Table = FormatedTableName;
return Dal.PageSplit(builder, startRowIndex, maximumRows);
}
/// <summary>执行</summary>
/// <param name="sql">SQL语句</param>
/// <returns>影响的结果</returns>
public Int32 Execute(String sql)
{
//InitData();
//Int32 rs = Dal.Execute(sql, TableName);
//executeCount++;
//DataChange("Execute");
//return rs;
return Execute(true, false, sql);
}
/// <summary>执行</summary>
/// <param name="forceClearCache">是否跨越实体操作,直接执行SQL语句</param>
/// <param name="isUpdateMode">是否执行更新实体操作</param>
/// <param name="sql">SQL语句</param>
/// <returns>影响的结果</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public Int32 Execute(Boolean forceClearCache, Boolean isUpdateMode, String sql)
{
InitData();
Int32 rs = Dal.Execute(sql, TableName);
_ExecuteCount++;
if (forceClearCache) { _DirectExecuteSQLCount++; }
if (isUpdateMode) { _UpdateCount++; }
DataChange("Execute", forceClearCache, isUpdateMode);
return rs;
}
/// <summary>执行Truncate语句</summary>
/// <param name="sql">SQL语句</param>
/// <returns>影响的结果</returns>
public virtual Int32 Truncate(String sql)
{
InitData();
Int32 rs;
if (Dal.DbType == DatabaseType.SQLite)
{
rs = Dal.Execute(String.Format("Delete From {0}", FormatedTableName), TableName);
Dal.Execute("VACUUM", TableName);
Dal.Execute(String.Format("update sqlite_sequence set seq=0 where name={0}", FormatedTableName), TableName);
return rs;
}
else
{
rs = Dal.Execute(sql, TableName);
}
ClearCache("TRUNCATE TABLE");
if (_OnDataChange != null) { _OnDataChange(ThisType); }
return rs;
}
/// <summary>执行插入语句并返回新增行的自动编号</summary>
/// <param name="sql">SQL语句</param>
/// <returns>新增行的自动编号</returns>
public Int64 InsertAndGetIdentity(String sql)
{
//InitData();
//Int64 rs = Dal.InsertAndGetIdentity(sql, TableName);
//executeCount++;
//DataChange("InsertAndGetIdentity");
//return rs;
return InsertAndGetIdentity(true, sql);
}
/// <summary>执行插入语句并返回新增行的自动编号</summary>
/// <param name="forceClearCache">是否跨越实体操作,直接执行SQL语句</param>
/// <param name="sql">SQL语句</param>
/// <returns>新增行的自动编号</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public Int64 InsertAndGetIdentity(Boolean forceClearCache, String sql)
{
InitData();
Int64 rs = Dal.InsertAndGetIdentity(sql, TableName);
_ExecuteCount++;
if (forceClearCache) { _DirectExecuteSQLCount++; }
DataChange("InsertAndGetIdentity", forceClearCache, false);
return rs;
}
/// <summary>执行</summary>
/// <param name="sql">SQL语句</param>
/// <param name="type">命令类型,默认SQL文本</param>
/// <param name="ps">命令参数</param>
/// <returns>影响的结果</returns>
public Int32 Execute(String sql, CommandType type = CommandType.Text, params DbParameter[] ps)
{
//InitData();
//Int32 rs = Dal.Execute(sql, type, ps, TableName);
//executeCount++;
//DataChange("Execute " + type);
//return rs;
return Execute(true, false, sql, type, ps);
}
/// <summary>执行</summary>
/// <param name="forceClearCache">是否跨越实体操作,直接执行SQL语句</param>
/// <param name="isUpdateMode">是否执行更新实体操作</param>
/// <param name="sql">SQL语句</param>
/// <param name="type">命令类型,默认SQL文本</param>
/// <param name="ps">命令参数</param>
/// <returns>影响的结果</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public Int32 Execute(Boolean forceClearCache, Boolean isUpdateMode, String sql, CommandType type = CommandType.Text, params DbParameter[] ps)
{
InitData();
Int32 rs = Dal.Execute(sql, type, ps, TableName);
_ExecuteCount++;
if (forceClearCache) { _DirectExecuteSQLCount++; }
if (isUpdateMode) { _UpdateCount++; }
DataChange("Execute " + type, forceClearCache, isUpdateMode);
return rs;
}
/// <summary>执行插入语句并返回新增行的自动编号</summary>
/// <param name="sql">SQL语句</param>
/// <param name="type">命令类型,默认SQL文本</param>
/// <param name="ps">命令参数</param>
/// <returns>新增行的自动编号</returns>
public Int64 InsertAndGetIdentity(String sql, CommandType type = CommandType.Text, params DbParameter[] ps)
{
//InitData();
//Int64 rs = Dal.InsertAndGetIdentity(sql, type, ps, TableName);
//executeCount++;
//DataChange("InsertAndGetIdentity " + type);
//return rs;
return InsertAndGetIdentity(true, sql, type, ps);
}
/// <summary>执行插入语句并返回新增行的自动编号</summary>
/// <param name="forceClearCache">是否跨越实体操作,直接执行SQL语句</param>
/// <param name="sql">SQL语句</param>
/// <param name="type">命令类型,默认SQL文本</param>
/// <param name="ps">命令参数</param>
/// <returns>新增行的自动编号</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public Int64 InsertAndGetIdentity(Boolean forceClearCache, String sql, CommandType type = CommandType.Text, params DbParameter[] ps)
{
InitData();
Int64 rs = Dal.InsertAndGetIdentity(sql, type, ps, TableName);
_ExecuteCount++;
if (forceClearCache) { _DirectExecuteSQLCount++; }
DataChange("InsertAndGetIdentity " + type, forceClearCache, false);
return rs;
}
private void DataChange(String reason, Boolean forceClearCache, Boolean isUpdateMode)
{
// 还在事务保护里面,不更新缓存,最后提交或者回滚的时候再更新
// 一般事务保护用于批量更新数据,频繁删除缓存将会打来巨大的性能损耗
// 2012-07-17 当前实体类开启的事务保护,必须由当前类结束,否则可能导致缓存数据的错乱
if (_TransCount > 0) { return; }
DataChange(reason, forceClearCache, isUpdateMode, false);
}
private void DataChange(String reason, Boolean forceClearCache, Boolean isUpdateMode, Boolean isTransRoolback)
{
if (!forceClearCache)
{
ClearCache(String.Format("{0}(F{1}-U{2})", reason, forceClearCache ? 1 : 0, isUpdateMode ? 1 : 0), isUpdateMode, isTransRoolback);
}
else
{
ForceClearCache(String.Format("{0}(F{1}-U{2})", reason, forceClearCache ? 1 : 0, isUpdateMode ? 1 : 0), isUpdateMode);
}
if (_OnDataChange != null) { _OnDataChange(ThisType); }
}
private Action<Type> _OnDataChange;
/// <summary>数据改变后触发。参数指定触发该事件的实体类</summary>
public event Action<Type> OnDataChange
{
add
{
if (value != null)
{
// 这里不能对委托进行弱引用,因为GC会回收委托,应该改为对对象进行弱引用
//WeakReference<Action<Type>> w = value;
// 弱引用事件,只会执行一次,一次以后自动取消注册
_OnDataChange += new WeakAction<Type>(value, handler => { _OnDataChange -= handler; }, true);
}
}
remove { }
}
#endregion
#region 数据库高级操作
/// <summary>清空数据表,标识归零</summary>
/// <returns></returns>
public Int32 Truncate()
{
var rs = Dal.Session.Truncate(TableName);
// 干掉所有缓存
if (Dal.EnableCache)
{
Dal.EnableCache = false;
Dal.EnableCache = true;
}
Cache.Clear();
SingleCache.Clear(null);
LongCount = 0;
// 重新初始化
hasCheckInitData = false;
return rs;
}
#endregion
#region 事务保护
/// <summary>事务计数</summary>
[ThreadStatic]
private static Int32 _TransCount;
/// <summary>实体操作次数</summary>
[ThreadStatic]
private static Int32 _ExecuteCount = 0;
/// <summary>实体更新操作次数</summary>
[ThreadStatic]
private static Int32 _UpdateCount = 0;
/// <summary>直接执行SQL语句次数</summary>
[ThreadStatic]
private static Int32 _DirectExecuteSQLCount = 0;
/// <summary>开始事务</summary>
/// <returns>剩下的事务计数</returns>
public virtual Int32 BeginTrans()
{
/* 这里也需要执行初始化检查架构,因为无法确定在调用此方法前是否已使用实体类进行架构检查,如下调用会造成事务不平衡而上抛异常:
* Exception:执行SqlServer的Dispose时出错:System.InvalidOperationException: 此 SqlTransaction 已完成;它再也无法使用。
*
* 如果实体的模型检查模式为CheckTableWhenFirstUse,直接执行静态操作
* using (var trans = new EntityTransaction<TEntity>())
* {
* TEntity.Delete(whereExp);
* TEntity.Update(new String[] { 字段1,字段2 }, new Object[] { 值1,值1 }, whereExp);
* trans.Commit();
* }
*/
InitData();
// 可能存在多层事务,这里不能把这个清零
//executeCount = 0;
_ExecuteCount = 0;
_UpdateCount = 0;
_DirectExecuteSQLCount = 0;
return _TransCount = Dal.BeginTransaction();
}
/// <summary>提交事务</summary>
/// <returns>剩下的事务计数</returns>
public virtual Int32 Commit()
{
//TransCount = Dal.Commit();
//// 提交事务时更新数据,虽然不是绝对准确,但没有更好的办法
//// 即使提交了事务,但只要事务内没有执行更新数据的操作,也不更新
//// 2012-06-13 测试证明,修改数据后,提交事务后会更新缓存等数据
//if (TransCount <= 0 && executeCount > 0)
//{
// DataChange("修改数据后提交事务");
// // 回滚到顶层才更新数据
// executeCount = 0;
//}
//return TransCount;
if (_ExecuteCount > 0)
{
Dal.AddDirtiedEntitySession(Key, this, _ExecuteCount, _UpdateCount, _DirectExecuteSQLCount);
_ExecuteCount = 0;
_UpdateCount = 0;
_DirectExecuteSQLCount = 0;
}
_TransCount = Dal.Commit();
return _TransCount;
}
/// <summary>回滚事务,忽略异常</summary>
/// <returns>剩下的事务计数</returns>
public virtual Int32 Rollback()
{
//TransCount = Dal.Rollback();
//// 回滚的时候貌似不需要更新缓存
////if (TransCount <= 0 && executeCount > 0) DataChange();
//if (TransCount <= 0 && executeCount > 0)
//{
// // 因为在事务保护中添加或删除实体时直接操作了实体缓存,所以需要更新
// DataChange("修改数据后回滚事务");
// executeCount = 0;
//}
//return TransCount;
if (_ExecuteCount > 0)
{
Dal.AddDirtiedEntitySession(Key, this, _ExecuteCount, _UpdateCount, _DirectExecuteSQLCount);
//// 因为在事务保护中添加或删除实体时直接操作了实体缓存,所以需要更新
//DataChange("修改数据后回滚事务", _DirectExecuteSQLCount > 0, _UpdateCount > 0, true);
_ExecuteCount = 0;
_UpdateCount = 0;
_DirectExecuteSQLCount = 0;
}
_TransCount = Dal.Rollback();
return _TransCount;
}
/// <summary>触发脏实体会话提交事务后的缓存更新操作</summary>
/// <param name="updateCount">实体更新操作次数</param>
/// <param name="directExecuteSQLCount">直接执行SQL语句次数</param>
[EditorBrowsable(EditorBrowsableState.Never)]
public void RaiseCommitDataChange(Int32 updateCount, Int32 directExecuteSQLCount)
{
DataChange("修改数据后提交事务", directExecuteSQLCount > 0, updateCount > 0, false);
}
/// <summary>触发脏实体会话回滚事务后的缓存更新操作</summary>
/// <param name="updateCount">实体更新操作次数</param>
/// <param name="directExecuteSQLCount">直接执行SQL语句次数</param>
[EditorBrowsable(EditorBrowsableState.Never)]
public void RaiseRoolbackDataChange(Int32 updateCount, Int32 directExecuteSQLCount)
{
DataChange("修改数据后回滚事务", directExecuteSQLCount > 0, updateCount > 0, true);
}
/// <summary>是否在事务保护中</summary>
//internal Boolean UsingTrans { get { return _TransCount > 1;/*因为Insert上面一定有一层缓存,这里减去1*/ } }
internal Boolean UsingTrans { get { return _TransCount > 0; } }
#endregion
#region 参数化
/// <summary>创建参数</summary>
/// <returns></returns>
public virtual DbParameter CreateParameter() { return Dal.Db.Factory.CreateParameter(); }
/// <summary>格式化参数名</summary>
/// <param name="name">名称</param>
/// <returns></returns>
public virtual String FormatParameterName(String name) { return Dal.Db.FormatParameterName(name); }
#endregion
#region 实体操作
private IEntityPersistence persistence { get { return XCodeService.Container.ResolveInstance<IEntityPersistence>(); } }
/// <summary>把该对象持久化到数据库,添加/更新实体缓存和单对象缓存,增加总计数</summary>
/// <param name="entity">实体对象</param>
/// <returns></returns>
public virtual Int32 Insert(IEntity entity)
{
var rs = persistence.Insert(entity);
var e = entity as TEntity;
e.MarkDb(true); // 确保在没有使用实体缓存和单对象缓存的情况下,标记来自数据库
// 如果当前在事务中,并使用了缓存,则尝试更新缓存
if (HoldCache || UsingTrans)
{
if (_cache != null) _cache.Update(e);
// 自动加入单对象缓存
if (_singleCache != null && _singleCache.Using) _singleCache.Add(e);
}
if (_Count >= 0) Interlocked.Increment(ref _Count);
return rs;
}
/// <summary>更新数据库,同时更新实体缓存</summary>
/// <param name="entity">实体对象</param>
/// <returns></returns>
public virtual Int32 Update(IEntity entity)
{
var rs = persistence.Update(entity);
var e = entity as TEntity;
e.MarkDb(true); // 确保在没有使用实体缓存和单对象缓存的情况下,标记来自数据库
// 如果当前在事务中,并使用了缓存,则尝试更新缓存
if (HoldCache || UsingTrans)
{
if (_cache != null) _cache.Update(e);
// 自动加入单对象缓存
if (_singleCache != null && _singleCache.Using) _singleCache.Add(e);
}
return rs;
}
/// <summary>从数据库中删除该对象,同时从实体缓存和单对象缓存中删除,扣减总数量</summary>
/// <param name="entity">实体对象</param>
/// <returns></returns>
public virtual Int32 Delete(IEntity entity)
{
var rs = persistence.Delete(entity);
// 如果当前在事务中,并使用了缓存,则尝试更新缓存
if (HoldCache || UsingTrans)
{
if (_cache != null)
{
var fi = Operate.Unique;
if (fi != null)
{
var v = entity[fi.Name];
Cache.Entities.RemoveAll(e => Object.Equals(e[fi.Name], v));
}
}
// 自动加入单对象缓存
if (_singleCache != null) _singleCache.Remove(entity as TEntity, false);
}
if (_Count >= 0) { Interlocked.Decrement(ref _Count); }
return rs;
}
#endregion
//#region 队列
///// <summary>实体队列</summary>
//public EntityQueue Queue { get; private set; }
//#endregion
}
#region 脏实体会话
/// <summary>脏实体会话,嵌套事务回滚时使用</summary>
/// <remarks>http://www.newlifex.com/showtopic-1216.aspx</remarks>
public class DirtiedEntitySession
{
internal Int32 ExecuteCount { get; set; }
internal Int32 UpdateCount { get; set; }
internal Int32 DirectExecuteSQLCount { get; set; }
internal IEntitySession Session { get; set; }
internal DirtiedEntitySession(IEntitySession session, Int32 executeCount, Int32 updateCount, Int32 directExecuteSQLCount)
{
Session = session;
ExecuteCount = executeCount;
UpdateCount = updateCount;
DirectExecuteSQLCount = directExecuteSQLCount;
}
}
#endregion
}
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