public override void ClearSeed(string tableName)
{
DatabaseEngine db = DatabaseEngineFactory.GetDatabaseEngine();
string PoolName = string.Format("{0}_{1}", db.DatabaseSession.DatabaseName, db.GetTableName(tableName));
lock (this)
{
using (DatabaseScope ds = new DatabaseScope().BeginTransaction(TransactionScopeOption.RequiresNew))
{
DatabaseEngine newdb = DatabaseEngineFactory.GetNewDatabaseEngine(db.DatabaseSession.DatabaseName);
newdb.DatabaseSession.MappingTable = db.DatabaseSession.MappingTable;
newdb.ExecuteNonQuery(string.Format("delete from tableseed where tablename='{0}'", db.GetTableName(tableName)));
if (SeedPoolDict.ContainsKey(PoolName))
{
SeedPoolDict.Remove(PoolName);
}
ds.Complete();
}
}
}
public override int GetSeed(string tableName, string pkColumn, int SeedPoolSize = 100)
{
SeedPool pool = null;
DatabaseEngine db = DatabaseEngineFactory.GetDatabaseEngine();
lock (this)
{
string PoolName = string.Format("{0}_{1}", db.DatabaseSession.DatabaseName, db.GetTableName(tableName));
if (SeedPoolDict.ContainsKey(PoolName))
{
pool = SeedPoolDict[PoolName]; //从种子缓存加载种子值
}
else
{
//初始化种子缓存
int SeedValue = 0;
int CurTableMaxSeed = db.GetMaxSeed(tableName, pkColumn, 0); //从数据库表中获取当前记录中已使用的最大种子值，如果没有记录则使用默认种子值(0)
using (DatabaseScope ds = new DatabaseScope().BeginTransaction(TransactionScopeOption.RequiresNew))
{
DatabaseEngine newdb = DatabaseEngineFactory.GetNewDatabaseEngine(db.DatabaseSession.DatabaseName);
newdb.DatabaseSession.MappingTable = db.DatabaseSession.MappingTable;
int?FactorySeed = GetFactorySeed(newdb, tableName);
if (FactorySeed.HasValue)
{
SeedValue = FactorySeed.Value;
}
else
{
SeedValue = CurTableMaxSeed;
newdb.ExecuteNonQuery(string.Format("insert into tableseed values('{0}',{1})", db.GetTableName(tableName), SeedValue));
}
ds.Complete();
}
pool = new SeedPool();
pool.TableName = tableName;
pool.SeedValue = pool.MaxSeedValue = SeedValue;
SeedPoolDict[PoolName] = pool;
}
}
lock (pool)
{
if (pool.SeedValue >= pool.MaxSeedValue)
{
using (DatabaseScope ds = new DatabaseScope().BeginTransaction(TransactionScopeOption.RequiresNew))
{
DatabaseEngine newdb = DatabaseEngineFactory.GetNewDatabaseEngine(db.DatabaseSession.DatabaseName);
newdb.DatabaseSession.MappingTable = db.DatabaseSession.MappingTable;
string strSQL = string.Format("update tableseed set seed=seed+{0} where tablename='{1}'", SeedPoolSize, newdb.GetTableName(tableName));
int ret = newdb.ExecuteNonQuery(strSQL);
if (ret != 1)
{
throw new ObjectMappingException(string.Format("GetSeed Failed -> \"{0}\"", strSQL));
}
pool.MaxSeedValue = GetFactorySeed(newdb, tableName).Value;
ds.Complete();
}
pool.SeedValue = pool.MaxSeedValue - SeedPoolSize;
}
return(++pool.SeedValue);
}
}