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Found 6 results

  1. I'm using the FireDAC TFDQuery component to run a SQL SELECT statement against a SQL Server database. The SQL statement contains a few 'calculated' column expressions using SQL functions such as CONVERT and CAST. For example : CONVERT(DECIMAL(9, 6), 0) AS TotalHours and CONVERT(TINYINT, 0) AS WorkflowState. In the resulting dataset, these calculated TField objects are always set to ReadOnly=True. I want to populate these calculated fields in code after the dataset has been returned. I know I can do this by changing the ReadOnly property of each field : Dataset.FieldByName('MyCalcField').ReadOnly := False; But is there a setting/option within the query components that I can use to force the fields created to always default to ReadOnly=False?
  2. bazzer747

    Date Sorting Odd

    I have a MSSQL table of financial transactions and I retrieve the data with a FDQuery which has the following statement: 'SELECT * FROM tAccounts ORDER BY AccName, TxnDate, Deposit' And executing that from the TFDQuery gives the correct results - a list in Account order and within that date order. See attached SQLView.jpg, specifically records 501 and 502 (correct date order). However, when I view this same table in a DBGrid in my application, the order is not the same. See attached DBGView.jpg, note the 20 Feb is before 17th Feb. The field is a Date datatype and there is no alteration to the Select statement anywhere in the application. The DBGrid is the first thing shown in the application and neither Formcreate or FormActivate do anything to alter the data returned. This 'mis-sorting' shows on several other of the records and my thinking is that in the DBGrid the TxnDate field is sorted in yyyy-mm-dd order, as in '20210217', which numerically comes before '20210220'. So this is what's happening, it seems, but why, when the SQL returns the data in the correct order does the DBGrid 're-sort' in a numeric fashion?
  3. bazzer747

    FireDac Query Issue

    Hi, I'm using a FireDac query to select different sets of data in an MSSQL database. I open the first query like this: dm.fdq.Open('SELECT * FROM tblUsers WHERE MSL = :pMG ORDER BY Sname, Fname',[ 1 ] ); which works fine. I then need to select a different set of records so I issue this (assuming this replaces the above statement): dm.fdq.Open('SELECT DISTINCT Fullname, Fname FROM vPGCEnrolments WHERE MatchGroup = :pMG AND MatchYear = :pY AND YES = 1',[ gvMatchGroup, gvYear ]); This works but I start to get Access violation error messages. The select works fine though, as the correct data displays. As I think this has something to do with the select statement I issue the following statement at the end of this procedure: dm.fdq.SQL.Clear; .. but when I look at the SQL string with ShowMessage( dm.SQL.text ); it still shows the Select Distinct line shown above. The Clear statement doesn't seem to clear anything. I've saved the SQL (assigning dm.fdq.SQL.text to a variable: cSQL, at the start of the procedure), and at the end of the procedure restore with dm.fdq.SQL.Add( cSQL ); but this does nothing either. I've a feeling I'm not understanding how the above should work correctly. Any advice would be appreciated.
  4. Hi, When I open my project I cycle through all the queries I use making sure they are all active, this works fine. Depending on what year I want to view I have a radio box with '2019' and '2020' as selections and from that I need to 'filter' the data to only show the year chosen., I load the value into cYear. So I have this line: qQueryname.Open( 'SELECT * FROM tTablename WHERE mYear = :pY ORDER BY eDate',[ cYear ] ); When this line is executed I get the error message above on this query, which is confusing me as it is an 'Open' command. The weirder thing is that the SQL is executed OK and the resulting data is the correct year's data. Using: Filtered:= False; Filter:= 'MatchYear = ' + cYear; Filtered:= True; code instead works perfectly with no issues.
  5. bazzer747

    MSSQL Busy

    A client has several of the applications I've written over the past several years and all work OK, They all connect (with FireDac) to a Microsoft SQL Server. However, I've just loaded a newer application (compiled in Delphi 10.3.3) and when I run it on this PC I get the following FireDac error message immediately (see attached): Exception EMSSQLNativeException in module ... at ..... [FireDAC][Phys][ODBC][Microsoft][ODBC SQL Server Driver]Connection is busy with results for another hstmt The PC is not running any other application that could be accessing the MS SQL Server, so I'm at a loss as to why it is busy at all. This application works fine on my development machine. Would this be a driver issue, maybe a newer driver is needed (is there one)? Or does Delphi 10.3.3/FireDAC do something differently to what it did in earlier versions? Any thoughts would be much appreciated.
  6. bazzer747

    Master-Detail Example

    Does anybody know where I can find a (simple) example of setting up a Master-Detail on two tables (MSSQL in my case)? All I can find via the internet are either overly complicated examples or in non-English languages. The Help in Delphi/Firedac is the former and very difficult to follow.