private static string PrepareUpdateData(DELock lockData, bool forceOverride)
{
ORMappingItemCollection mappingInfo = GetMappingInfo();
UpdateSqlClauseBuilder uBuilder = ORMapping.GetUpdateSqlClauseBuilder(lockData, mappingInfo);
WhereSqlClauseBuilder wBuilder = ORMapping.GetWhereSqlClauseBuilderByPrimaryKey(lockData, mappingInfo);
if (forceOverride == false)
{
wBuilder.AppendItem("LockTime", "DATEADD(SECOND, -EffectiveTime, GETDATE())", "<", true);
}
StringBuilder sql = new StringBuilder();
sql.AppendFormat("UPDATE {0} SET {1} WHERE {2}",
mappingInfo.TableName,
uBuilder.ToSqlString(TSqlBuilder.Instance),
wBuilder.ToSqlString(TSqlBuilder.Instance));
sql.Append(TSqlBuilder.Instance.DBStatementSeperator);
sql.Append("SELECT @@ROWCOUNT");
sql.Append(TSqlBuilder.Instance.DBStatementSeperator);
sql.AppendFormat("SELECT * FROM {0} WHERE LockID = {1}",
GetMappingInfo().TableName,
TSqlBuilder.Instance.CheckUnicodeQuotationMark(lockData.LockID));
return(sql.ToString());
}
/// <summary>
/// 延长锁的时间
/// </summary>
/// <param name="lockData"></param>
/// <returns></returns>
public DECheckLockResult ExtendLockTime(DELock lockData)
{
DECheckLockResult result = null;
lockData.LockTime = DateTime.MinValue;
using (TransactionScope scope = TransactionScopeFactory.Create())
{
bool updated = false;
DELock lockInDB = lockInDB = Update(lockData, true, out updated);
if (updated == false)
{
result = BuildNotAvailableResult(lockData);
}
else
{
result = BuildAvailableResult(lockInDB, true);
}
scope.Complete();
}
return(result);
}
private static DELock Insert(DELock lockData)
{
StringBuilder sql = new StringBuilder();
sql.Append(ORMapping.GetInsertSql(lockData, TSqlBuilder.Instance));
sql.Append(TSqlBuilder.Instance.DBStatementSeperator);
sql.AppendFormat("SELECT * FROM {0} WHERE LockID = {1}",
GetMappingInfo().TableName,
TSqlBuilder.Instance.CheckUnicodeQuotationMark(lockData.LockID));
DELock result = null;
try
{
DataTable table = DbHelper.RunSqlReturnDS(sql.ToString(), GetConnectionName()).Tables[0];
result = new DELock();
ORMapping.DataRowToObject(table.Rows[0], GetMappingInfo(), result);
}
catch (System.Data.SqlClient.SqlException ex)
{
if (ex.Number != 2627)
{
throw;
}
}
return(result);
}
private static DECheckLockResult BuildNotAvailableResult(DELock lockData)
{
DECheckLockResult result = new DECheckLockResult();
result.Lock = lockData;
result.LockStatus = DECheckLockStatus.Locked;
return(result);
}
/// <summary>
/// 删除锁
/// </summary>
public void DeleteLock()
{
DELock lockData = this._Lock;
if (lockData == null)
{
lockData = DELock.CreateDefaultDataOperationLock();
}
DELockAdapter.Instance.DeleteLock(lockData);
this._Lock = null;
}
/// <summary>
/// 延长锁的时间
/// </summary>
public void ExtendLock()
{
DELock lockData = this._Lock;
if (lockData == null)
{
lockData = DELock.CreateDefaultDataOperationLock();
}
DECheckLockResult checkResult = DELockAdapter.Instance.ExtendLockTime(lockData);
this._Lock = checkResult.Lock;
}
private static DELock Update(DELock lockData, bool forceOverride, out bool updated)
{
DataSet ds = DbHelper.RunSqlReturnDS(PrepareUpdateData(lockData, forceOverride), GetConnectionName());
(ds.Tables[1].Rows.Count > 0).FalseThrow("不能找到ID为{0}的锁信息", lockData.LockID);
updated = (int)ds.Tables[0].Rows[0][0] > 0;
DELock result = new DELock();
ORMapping.DataRowToObject(ds.Tables[1].Rows[0], GetMappingInfo(), result);
return(result);
}
public static DELock CreateDefaultDataOperationLock()
{
DELock result = new DELock();
result.LockID = DefaultDataOperationLockID;
result.LockType = DELockType.DataOperation;
if (DeluxePrincipal.IsAuthenticated)
{
result.LockPerson = DeluxeIdentity.CurrentUser;
}
return(result);
}
private static DELock GetLockInfo(string lockID)
{
string sql = string.Format("SELECT * FROM {0} WHERE LockID = {1}",
GetMappingInfo().TableName, TSqlBuilder.Instance.CheckUnicodeQuotationMark(lockID));
DataTable table = DbHelper.RunSqlReturnDS(sql, GetConnectionName()).Tables[0];
(table.Rows.Count > 0).FalseThrow("不能根据\"{0}\"找到对应的锁信息", lockID);
DELock result = new DELock();
ORMapping.DataRowToObject(table.Rows[0], GetMappingInfo(), result);
return(result);
}
public void AddLock(TimeSpan effectiveTime, string description)
{
DELock lockData = DELock.CreateDefaultDataOperationLock();
lockData.EffectiveTime = effectiveTime;
lockData.Description = description;
DECheckLockResult checkResult = DELockAdapter.Instance.AddLock(lockData);
if (checkResult.Available == false)
{
throw new DECheckLockException(DECheckLockException.CheckLockResultToMessage(checkResult));
}
this._Lock = checkResult.Lock;
}
private static DECheckLockResult BuildAvailableResult(DELock lockData, bool overrideLock)
{
DECheckLockResult result = new DECheckLockResult();
result.Lock = lockData;
if (overrideLock)
{
result.LockStatus = DECheckLockStatus.LockExpired;
}
else
{
result.LockStatus = DECheckLockStatus.NotLocked;
}
return(result);
}
/// <summary>
/// 加锁。返回新加的锁，或者原来锁的状态。成功与否，检查SCCheckLockResult的Available属性
/// </summary>
/// <param name="lockData"></param>
/// <returns></returns>
public DECheckLockResult AddLock(DELock lockData)
{
DECheckLockResult result = null;
lockData.LockTime = DateTime.MinValue;
using (TransactionScope scope = TransactionScopeFactory.Create())
{
//插入是否成功，判断锁是否已经存在
DELock lockInDB = Insert(lockData);
if (lockInDB == null)
{
//更新是否成功，如果不成功，表示锁被占用。
bool updated = false;
lockInDB = Update(lockData, false, out updated);
if (updated == false)
{
result = BuildNotAvailableResult(lockInDB);
}
else
{
result = BuildAvailableResult(lockInDB, true);
}
}
else
{
result = BuildAvailableResult(lockInDB, false);
}
scope.Complete();
}
return(result);
}
public void DeleteLock(DELock lockData)
{
lockData.NullCheck("lockData");
DeleteLock(lockData.LockID);
}
