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C# SQL Date range query

I am trying to embed a SQL command in my VS C# 2008 program. Nothing I tried is returning any values. I have tried defining StartDate and EndDates as datetime fileds and string fields. This command works in SQL but not when embedded in my code. What is the correct syntax to correct this?

StartDate = txtStartDate.Text;
                EndDate = txtEndDate.Text;

                SqlConnection DataConnection = GetConnection();

                /* Define record set for query results of inventory items */
                DataDataSet = new System.Data.DataSet();
                DataDataSet.CaseSensitive = false;

                DataCommand = new System.Data.SqlClient.SqlCommand();
                DataCommand.Connection = DataConnection;

                DataCommand.CommandText = "SELECT rtrim(mc.PayerCode) as IDInsurCompany,rtrim(nv.PID) as PID,rtrim(nv.IDPatInsur) as IDPatInsur,rtrim(nv.FirstName) as Firstname,rtrim(nv.LastName) as LastName,rtrim(convert(char(10),nv.DOB,101)) as DOB " +
                "from [dm_asarum_OPX]..[dmpatinsur] nv, [mappingcodes]..[MapCodes] mc " +
                "where nv.IDInsurCompany = mc.navcode " +
                "order by nv.IDPatInsur";

                DataCommand.CommandText = "SELECT  CASE WHEN MapCodes.PayerCode IS NULL THEN '0' ELSE MapCodes.PayerCode END AS PayerCode," +
                                          "CASE WHEN dmProvid.ProvId IS NULL THEN '0' ELSE dmProvid.ProvId END AS Provid," +
                                          "CASE WHEN dmPatInsur.PolicyNumber IS NULL THEN '0' ELSE dmPatInsur.PolicyNumber END AS PolicyNumber," +
                                          "CASE WHEN dmPatientDemo.FirstName IS NULL THEN '' ELSE dmPatientDemo.FirstName END AS FirstName," +
                                          "CASE WHEN dmPatientDemo.MiddleInitial IS NULL THEN '' ELSE dmPatientDemo.MiddleInitial END AS MiddleInitial," +
                                          "CASE WHEN dmPatientDemo.LastName IS NULL THEN '' ELSE dmPatientDemo.LastName END Lastname," +
                                          "CASE WHEN dmPatientDemo.DOB IS NULL THEN '' ELSE convert(char(10),dmPatientDemo.DOB,101) END AS DOB," +
                                          "CASE WHEN dmAppt.ApptDateTime IS NULL THEN '' ELSE convert(char(10),dmAppt.ApptDateTime,101) END AS ApptDate " +
                                          "FROM ((([dm_asarum_OPX]..[dmAppt] dmAppt INNER JOIN [dm_asarum_OPX]..[dmPatientDemo] dmPatientDemo ON dmAppt.PID=dmPatientDemo.PID) " +
                                          "INNER JOIN [dm_asarum_OPX]..[dmPatInsur] dmPatInsur ON dmAppt.PID=dmPatInsur.PID) " +
                                          "INNER JOIN [dm_asarum_OPX]..[dmProvider] dmProvider ON dmAppt.IDApptResourceRendering=dmProvider.IDApptResource) " +
                                          "INNER JOIN [dm_asarum_OPX]..[dmProvId] dmProvId ON dmProvider.IDProvider=dmProvId.IDProvider	" +
                                          "LEFT OUTER JOIN [mappingcodes]..[MapCodes] MapCodes ON dmPatInsur.IDInsurCompany=MapCodes.NavCode " +
                                          "WHERE  dmPatInsur.Inactive=0 AND dmProvId.IDGenProvIDType=13 AND dmPatInsur.IDGenRelationship=1 AND " +
                                          "convert(char(8),dmAppt.ApptDateTime,112)>=convert(char(8),'" + StartDate + "',112) and " +
                                          "convert(char(8),dmAppt.ApptDateTime,112)<=convert(char(8),'" + EndDate + "',112) AND dmAppt.IDApptStatus=1 " +
                                          "order by dmAppt.ApptDateTime,dmPatientDemo.LastName,dmPatientDemo.FirstName,dmPatientDemo.MiddleInitial";

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Mathiyazhagan

try this:
Keep start date and end date as string field and remove convert function of SQL
i.e> change convert(char(8),'" + StartDate + "',112) to StartDate

rwheeler23

ASKER

That works but I have to type the dates in as 20110211. So it looks like I have to setup this up to convert the date string to a date and then convert it to the 112 format. I want the users to be able to enter 02/11/2011 or 2/11/2011 or 02/11/11 or 2/11/11. I want my program to handle the date conversions.

rwheeler23

ASKER

This seems to to the trick!

"convert(char(8),dmAppt.ApptDateTime,112)>=convert(char(8),convert(datetime,'" + StartDate + "'),112) and " +

Lowfatspread

but just convert startdate to a date/datetime and dont convert the dmAppt.ApptDateTime column...

by using convert(...dmAppt.ApptDateTime ,112) you are making it difficult for the database to use an
index....

so

"dmAppt.ApptDateTime between convert(datetime,'" + StartDate + "',101) and " + "convert(datetime,'" + EndDate + "',101) AND dmAppt.IDApptStatus=1 " +

also
"CASE WHEN dmProvid.ProvId IS NULL THEN '0' ELSE dmProvid.ProvId END AS Provid," +
"CASE WHEN dmPatientDemo.DOB IS NULL THEN '' ELSE convert(char(10),dmPatientDemo.DOB,101) END AS DOB," +
is
"Coalesce(dmprovid.provid,'0') as Provid," +
"Coalesce(convert(char(10),dmPatientDemo.DOB,101),'') as DOB," +

rwheeler23

ASKER

I tried your suggestion for the date conversion:

"dmAppt.ApptDateTime between convert(datetime,'" + StartDate + "',101) and " + "convert(datetime,'" + EndDate + "',101) AND dmAppt.IDApptStatus=1 " +

and it returns no data. If I put it back to my way the data is there.

rwheeler23

ASKER

The problem is the time portion of the date. The user has the ability to enter a range of dates. If they pick the same date, it returns nothing and even if they were to pick 02/10/11 - 02/11/11 they would only get 02/10/11.

The coalesce idea works well however, thanks.

ASKER CERTIFIED SOLUTION

Lowfatspread

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rwheeler23

ASKER

First I had them as Datetime fields, then string fields. The database is not mne so I have no control of what is put in there. In SQL they are defined as Datetime. I will format the variables in my code with the begin and end times and that should do it.

rwheeler23

ASKER

Is there any sample that takes into account all the possible date combinations. Right now the code works as long as the dates are entered as MM/DD/YYYY. But some months and days have 1 digit and other have two. I just want the user to enter dates and then have code convert to YYYYMMDD HH:MM:SS.ss

SOLUTION

Lowfatspread

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