/// <summary>
/// get one data by filter
/// 得到指定条件的一个数据
/// </summary>
/// <param name="ColumnName"></param>
/// <returns></returns>
public Object First(String ColumnName)
{
//数据库连接
if (_connectionConfig.IsAutoCloseConnection == false)
{
if (_database.CheckStatus() == false)
{
throw new Exception("databse connect not open");
}
}
if (_connectionConfig.IsAutoCloseConnection == true)
{
_database.Open();
}
Object result;
if (filterDefinition != null)
{
result = _database.GetSpeciaRecordValue(_databasename, _TableName, filterDefinition, ColumnName);
}
else
{
result = _database.GetSpeciaRecordValue(_databasename, _TableName, new BsonDocument(), ColumnName);
}
if (_connectionConfig.IsAutoCloseConnection == true)
{
_database.Close();
}
return(result);
}