/// <summary>
/// 计算要插入、更新或删除的已修改对象的集，并执行相应命令以实现对数据库的更改
/// </summary>
/// <returns></returns>
public int SubmitChanges()
{
int count = _dbQueryables.Count;
if (count == 0) return 0;
IDbConnection conn = null;
IDbTransaction trans = null;
try
{
List<string> sqlList = this.Resolve(false);
conn = _provider.CreateConnection(true);
if (count > 1) trans = conn.BeginTransaction(System.Data.IsolationLevel.ReadCommitted);
var result = _provider.Execute(sqlList, trans);
this.SetIdentity(result);
if (trans != null) trans.Commit();
}
catch
{
if (trans != null) trans.Rollback();
throw;
}
finally
{
if (trans != null) trans.Dispose();
if (conn != null) conn.Close();
if (conn != null) conn.Dispose();
this.Dispose();
}
return count;
}