/// <summary>
/// Read returned results.
/// </summary>
public MochaReader <object> ExecuteReader()
{
CheckConnection();
var reader = new MochaReader <object>();
if (!RETURN.IsReturnableCmd())
{
return(reader);
}
bool
fromkw,
orderby = false,
groupby = false;
string lastcommand;
var tags = Mhql_AT.GetATS(Command, out lastcommand);
if (lastcommand.StartsWith("USE", StringComparison.OrdinalIgnoreCase))
{
if (tags.Length > 1)
{
throw new MochaException("Multi tags is cannot used with USE keyword!");
}
string tag =
tags.Length == 0 ?
string.Empty :
tags.GetFirst();
if (tag.Equals("@STACKS", StringComparison.OrdinalIgnoreCase))
{
throw new MochaException("@STACKS is cannot target if used with USE keyword!");
}
var use = USE.GetUSE(out lastcommand);
fromkw = use.IndexOf("FROM", StringComparison.OrdinalIgnoreCase) != -1;
var table =
string.IsNullOrEmpty(tag) || tag.Equals("@TABLES", StringComparison.OrdinalIgnoreCase) ?
USE.GetTable(use, fromkw) :
tag.Equals("@SECTORS", StringComparison.OrdinalIgnoreCase) ?
USE.GetSector(use, fromkw) :
throw new MochaException("@ mark is cannot processed!");
do
{
//Orderby.
if (ORDERBY.IsORDERBY(lastcommand))
{
orderby = true;
if (groupby)
{
throw new MochaException("GROUPBY keyword must be specified before ORDERBY!");
}
ORDERBY.OrderBy(ORDERBY.GetORDERBY(lastcommand, out lastcommand), ref table);
}
//Groupby.
else if (GROUPBY.IsGROUPBY(lastcommand))
{
groupby = true;
GROUPBY.GroupBy(GROUPBY.GetGROUPBY(lastcommand, out lastcommand), ref table);
}
//Must.
else if (MUST.IsMUST(lastcommand))
{
if (orderby)
{
throw new MochaException("MUST keyword must be specified before ORDERBY!");
}
else if (groupby)
{
throw new MochaException("MUST keyword must be specified before GROUPBY!");
}
MUST.MustTable(MUST.GetMUST(lastcommand, out lastcommand), ref table, fromkw);
}
//Return.
else if (lastcommand.Equals("RETURN", StringComparison.OrdinalIgnoreCase))
{
break;
}
else
{
throw new MochaException($"'{lastcommand}' command is cannot processed!");
}
} while(true);
reader.array = new MochaArray <object>(table);
}
else if (lastcommand.StartsWith("SELECT", StringComparison.OrdinalIgnoreCase))
{
var select = SELECT.GetSELECT(out lastcommand);
fromkw = select.IndexOf("FROM", StringComparison.OrdinalIgnoreCase) != -1;
if (fromkw)
{
throw new MochaException("FROM keyword is cannot use with SELECT keyword!");
}
List <object> collection = new List <object>();
if (tags.Length == 0)
{
collection.AddRange(SELECT.GetTables(select));
}
else
{
bool
tables = false,
sectors = false,
stacks = false;
for (int index = 0; index < tags.Length; index++)
{
if (tags.ElementAt(index).Equals("@TABLES", StringComparison.OrdinalIgnoreCase))
{
if (tables)
{
throw new MochaException("@TABLES cannot be targeted more than once!");
}
tables = true;
collection.AddRange(SELECT.GetTables(select));
}
else if (tags.ElementAt(index).Equals("@SECTORS", StringComparison.OrdinalIgnoreCase))
{
if (sectors)
{
throw new MochaException("@SECTORS cannot be targeted more than once!");
}
sectors = true;
collection.AddRange(SELECT.GetSectors(select));
}
else if (tags.ElementAt(index).Equals("@STACKS", StringComparison.OrdinalIgnoreCase))
{
if (stacks)
{
throw new MochaException("@STACKS cannot be targeted more than once!");
}
stacks = true;
collection.AddRange(SELECT.GetStacks(select));
}
else
{
throw new MochaException(tags.ElementAt(index));
}
}
}
do
{
//Orderby.
if (ORDERBY.IsORDERBY(lastcommand))
{
throw new MochaException("ORDERBY keyword is canot used with SELECT keyword!");
}
//Groupby.
else if (GROUPBY.IsGROUPBY(lastcommand))
{
throw new MochaException("GROUPBY keyword is canot used with SELECT keyword!");
}
//Must.
else if (MUST.IsMUST(lastcommand))
{
throw new MochaException("MUST keyword is canot used with SELECT keyword!");
}
//Return.
else if (lastcommand.Equals("RETURN", StringComparison.OrdinalIgnoreCase))
{
break;
}
else
{
throw new MochaException($"'{lastcommand}' command is cannot processed!");
}
} while(true);
reader.array = new MochaArray <object>(collection);
}
else
{
throw new MochaException("MHQL is cannot processed!");
}
return(reader);
}
