ADO+MySQL and searching by dates

rbuser

Hi All,

I have created a report that pulls it's data form a MySQL backend using ADO
and the MySQL ODBC drivers. The problem I am having is trying to add date
search criteria. The dates are stored as yyyy-mm-dd in the backend but I
can only enter them as mm-dd-yyyy when running the report. Using the
mm-dd-yyyy format results in no data being returned.

Has anyone ran into this issue or have any ideas as to a solution.

Thanks.

nicocizik

Hi Phillip,

-------------------------------------------------
Tech Tip: Date formats used by DADE
-------------------------------------------------

DADE handles in two phases:


1. User entry

This occurs when the user specifies a date using the Query tools or the
AutoSearch dialog. DADE converts the date string entered by the user into a
Delphi TDateTime value. The string entered by the user is converted using
Delphi's StrToDateTime. By default Delphi's StrToDateTime relies on the date
formatting variables for the current windows locale. These can be overridden
by the developer. See Delphi online help for StrToDateTime for more
information.


2. SQL submitted to the server

When generating the SQL to be submitted to the database server, DADE
converts the TDateTime value from number 1 above, to a string using the
Delphi's FormatDateTime function. The format string used to convert the
TDateTime is specified by the TdaSession.GetSearchCriteriaDateFormat and
TdaSession.GetSearchCriteriaTimeFormat functions. These are virtual methods
which may be overridden by descendant TdaSession classes.

Below are the default values returned.


{---------------------------------------------------------------------------
---}
{ TdaSession.GetSearchCriteriaDateFormat }

function TdaSession.GetSearchCriteriaDateFormat(aDatabaseType:
TppDatabaseType; const aDatabaseName: String): String;
begin

{return a format usable by FormatDate}
case aDatabaseType of

dtMSAccess:
Result := 'YYYY-MM-DD';

dtMSSQLServer, dtSybaseASA, dtSybaseASE, dtOracle:
Result := 'YYYY/MM/DD';

dtAdvantage:
Result := 'YYYY-MM-DD';

else
Result := 'MM/DD/YYYY';

end;

end; {function, GetSearchCriteriaDateFormat}

{---------------------------------------------------------------------------
---}
{ TdaSession.GetSearchCriteriaTimeFormat }

function TdaSession.GetSearchCriteriaTimeFormat(aDatabaseType:
TppDatabaseType; const aDatabaseName: String): String;
begin
{return a format usable by FormatDateTime}
case aDatabaseType of

dtMSAccess:
Result := 'HH::MM::SS';

else
Result := 'HH:MM:SS';
end;

end; {function, GetSearchCriteriaTimeFormat}



Note: DADE augments the above with additional formatting delimiters for
Oracle and MSAccess. See TdaSQL.ResolveCriteria located in
RBuilder\Source\daSQL.pas for more information.



--