How Do We Store Null In The Database
Jul 12, 2007
Hi
I want to know how do we store null in the database
i know Null is unkown value
but it has to be something so the SQL server can know its null ( computer only knows 0s and 1s )
is it pointers and null does not have a pointer?
or do we store something physically?
an example : we have string(varchar) column that has this value in it "Joey Tribbiani" that means in the hard disk we will see 14 bytes "Joey Tribbiani" in there, if we changed the value to "Monika" the 14 bytes will be replaced by 5 bytes "Monika", if we changed to empty strike then we will have 0 bytes ""
now if changed it to become NULL what is going to happen to the hard disk, what is going to be in there physically??
may anyone help me in this?
many thanks
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Dec 14, 2005
I have a problem I 'get stuck on it. i hope someone can help me.
I have a SQLServer table with an ID-field with a primary key and identity on it, and a couple of other fields with defaultvalue "" and NOT nullable
When i like to update an record in an formview of ASP 2.0 and fill in all fields everything is updated and everything goes fine
but
when I leave one field blank then I get the message 'can not enter null value in column X'
even when I place in the Updateparameter in my code
<asp:Parameter Name="Name" DefaultValue="" /> ASP tries to update an Null value
when i place an space as default value like
<asp:Parameter Name="Name" DefaultValue=" " />
everything goes fine exept there is an space in my database.
How can I update my record, and leave some textboxes emtpy AND where my fields are NOT nullable
I'm getting desparate of this.
make my fields nullable is not an option because this is a 'customerswish'
Please help
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Apr 27, 2007
I have a form and a connectionString to a SQL database. If the textbox at the form is empty i want to store a null value there but when i pass this value as a parameter it brings the following error: Failed to convert parameter value from a String to a Int32..
cmd.Parameters("@Segundo_nombre").Value = txtSecondName.Text.ToString --> suposing is null it brings an Error.
cmd.Parameters.Add(Apellido)
How can i manage this? I want to store this value if it is null or not.
Also i don't know how to assign a null value to a variable. I tried with
v_flag = check_selection.check_string(v_idioma)
If v_flag = 1 Then 'la variable posee el texto Seleccione
v_idioma = DBNull.Value
but it's not working.
Thanks!!
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May 15, 2008
i am using csFindProperty store procedure in my application. here there are several input parameter are there. my procedure structure are:
ALTER PROCEDURE [dbo].[csFindProperty]
@HouseNumber varchar(10),
@Street varchar(100),
@City varchar(100),
@State varchar(2),
@Zip varchar(15),
@County varchar(25),
@SquareFootageStart int,
@SquareFootageEnd int,
@Bedrooms int,
@Bathrooms decimal(18, 2),
@Garage decimal(18, 0),
@Basement bit,
@StyleID int,
@Subdivision varchar(50),
@SchoolDistrict varchar(50),
@MonthlyRentStart money,
@MonthlyRentEnd money,
@ListPriceStart money,
@ListPriceEnd money,
@PetsAllowed bit
AS
select distinct hd.housenumber,hd.street,hd.city,hd.state,hd.zip, rd.monthlyrent,sd.listdate, sd.listprice from housedata hd, rentdata rd,
saledata sd where hd.HouseNumber like @HouseNumber and hd.Street like @Street and hd.City like @City and hd.State like @State
and hd.Zip like @Zip and hd.County like @County and hd.SquareFootage >= @SquareFootageStart and hd.SquareFootage <= @SquareFootageEnd
and hd.Bedrooms like @Bedrooms and hd.Bathrooms like @Bathrooms and hd.Garage like @Garage and hd.Basement like @Basement
and hd.StyleID like @StyleID and hd.Subdivision like @Subdivision and hd.SchoolDistrict like @SchoolDistrict and rd.MonthlyRent >=@MonthlyRentStart
and rd.MonthlyRent <= @MonthlyRentEnd and sd.ListPrice >= @ListPriceStart and sd.ListPrice <= @ListPriceEnd and rd.PetsAllowed like @PetsAllowed
and hd.HouseDataID=sd.HouseDataID
Execute procedure structure:
DECLARE@return_value int
EXEC@return_value = [dbo].[csFindProperty]
@HouseNumber = N'1733',
@Street = N'N 40th',
@City = N'Kansas City',
@State = N'KS',
@Zip = N'%',
@County = N'Wyandotte',
@SquareFootageStart = 0,
@SquareFootageEnd = 0,
@Bedrooms = 2,
@Bathrooms = 1.00,
@Garage = 0,
@Basement = false,
@StyleID = 0,
@Subdivision = N'',
@SchoolDistrict = N'%',
@MonthlyRentStart = 1025.00,
@MonthlyRentEnd = 1050.00,
@ListPriceStart = 500.00,
@ListPriceEnd = 1000.00,
@PetsAllowed = false
SELECT'Return Value' = @return_value
GO
if the user enter in the column HouseNumber=1733 that value passed in sp @HouseNumber = N'1733', suppose user can not type any value in the column HouseNumber means, i assign the value HouseNumber='%'. HouseNumber is a varchar datatype.
what my question is: if the column datatype money or int or bit means what is the value i assign @Bedrooms = 2, this situation. since bedrooms is int datatype. if i assign @Bedrooms ='%', conversion error will occur. pls any one can help me come out this problem.
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Apr 19, 2006
HI,ALL:
I'm new to store procedure in sql 2000,now I create a sp to generate Balance report data ,
but when I run my sp in sql 2000 Query analyzer,I can get the data and some of data is null.
Now I want to replace null with '0' in my sp result data, is it possible to do it in store procedure in design model. ?
how to get the soluation ?
thanks a lot!
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Dec 16, 2014
We have a table with 10 columns each column is of datatype int and can accept nulls, when I do a save is it better to have 0 inserted in to the column or just insert null?
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Apr 3, 2008
Hi Experts,
I have an urgent needs.
I want to store null for decimal type to sql server. But I do not know how to do that. I get data from user input. If the user did not enter anything in the textbox, then I want to store null to sql server. I list a piece od code below. I got error in the last line fItemObject.ChargeAmount = null;.
if (!String.IsNullOrEmpty(txtDescription.Text)) myObject.LongDesc = txtLongDesc.Text; else myObject.LongDesc = null;
if (!String.IsNullOrEmpty(txtAmount.Text)) myObject.Amount = Convert.ToDecimal(txtChargeAmount.Text); else myObject.ChargeAmount = null;
// Then I submit the myobject to the sql server.
Thank you very much in adavance!
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Jun 28, 2004
I would drop and add the table but the data can't be deleted. So if anyone could help with the statement it would be greatly appreciated. Thanks
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Oct 27, 2015
We have a case where in we should show date based on conditions for e.g if we had a column defined as
col varchar(10) then we would show col as 'NULL' for some condition and actual value when no condition
Normaly date values are stored here e.g under col 20150901 .
CaseÂ
when col>'20150901' then 'NULL'
else col
end as Derivedcol
Note this is an extract process and we are presenting data by pumping the data in a table .
Now there is another similar column -colz varchar(10) Â which stores date but doesnt have case condition so whenever date has no value its shows null which is database null.
So whats the difference between database null and string null ?
 How can we show database null for the case condition instead of string "null"?
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May 16, 2000
I need to grant select, insert, update, and delete permission to an object residing in Database "X" from a store procedure in database "Y". I have already tried USE database statement. Any suggestion.
Thanks
Maroof Khan
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Sep 20, 2006
Hey. I need to substitute a value from a table if the input var is null. This is fine if the value coming from table is not null. But, it the table value is also null, it doesn't work. The problem I'm getting is in the isnull line which is in Dark green color because @inFileVersion is set to null explicitly and when the isnull function evaluates, value returned from DR.FileVersion is also null which is correct. I want the null=null to return true which is why i set ansi_nulls off. But it doesn't return anything. And the select statement should return something but in my case it returns null. If I comment the isnull statements in the where clause, everything works fine. Please tell me what am I doing wrong. Is it possible to do this without setting the ansi_nulls to off??? Thank you
set ansi_nulls off
go
declare
@inFileName VARCHAR (100),
@inFileSize INT,
@Id int,
@inlanguageid INT,
@inFileVersion VARCHAR (100),
@ExeState int
set @inFileName = 'A0006337.EXE'
set @inFileSize = 28796
set @Id= 1
set @inlanguageid =null
set @inFileVersion =NULL
set @ExeState =0
select Dr.StateID from table1 dR
where
DR.[FileName] = @inFileName
AND DR.FileSize =@inFileSize
AND DR.FileVersion = isnull(@inFileVersion,DR.FileVersion)
AND DR.languageid = isnull(@inlanguageid,null)
AND DR.[ID]= @ID
)
go
set ansi_nulls on
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Hi everyone,
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Hello, Mike
It stores into the database as "Hello, Mike" and if I read from the database, it does not have seperate lines and shows it like this;
Hello, Mike
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Aug 24, 2006
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Regards,
Karen
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May 8, 2007
please tell the steps
How to store File in SQL DataBase
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Hi
Anyone Knows
I want to store SQL 2005 Existing Database into SQL Server Through .Net.if i give Database Name in .Net and that Database automatically stored in SQL Server 2005.P(including that Existing Database Tables and Stored Procedures).Please Help me.
Tamil
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Feb 26, 2006
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command means the query like ( Select * from tableNAme )
Like thins pl help me & tell me What datatype should i use for that ?
Thaks for your help in advance
Have a Good Day
Harsh
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How do you setup your database to allow storing languages such as Arabic?
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May 8, 2006
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Aug 23, 2006
update Food set FoodName = ' æ??ä»?' where ID = 100
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Aug 11, 2006
Hello,
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How do I save the database through differenct stages of it's evolution? Suppose I populate the database, but later on decide that I we need to re-start from scratch and go back to the new database I created that is not populated. How do I save different versions of a database through it's evolution/progression?
Thanks in advance, Bill
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Hello All,
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Apr 11, 2007
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Oct 11, 2007
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and
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Mar 22, 2008
how to use class iDataReader's function getbytes(...............) to read binary data?
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Data.Common;using System.IO;
public partial class uploadFileToDatabase : System.Web.UI.Page{ string strUser; protected void Page_Load(object sender, EventArgs e) { strUser=Request.QueryString["download"]; if(strUser!=null) { string strConn="Data Source=hao-pc;Initial Catalog=simpleBBS;Persist Security Info=True;User ID=sa;Password=123;Pooling=False"; SqlDataAdapter sda=new SqlDataAdapter(); DbProviderFactory dbProviderFactory=DbProviderFactories.GetFactory("System.Data.SqlClient"); DbConnection dbConn=dbProviderFactory.CreateConnection(); dbConn.ConnectionString=strConn; dbConn.Open(); DbCommand dbComm=dbProviderFactory.CreateCommand(); dbComm.Connection=dbConn; dbComm.CommandText="select * from userFiles2 where fileisn='"+strUser+"'"; IDataReader myReader=dbComm.ExecuteReader(); int strFileLen=0; if(myReader.Read()) { strFileLen=Convert.ToInt32(myReader.GetString(3)); FileStream afs; string fPath; fPath = Server.MapPath(Request.ApplicationPath) + "\upLoadFiles\" + myReader.GetString(1); afs = new FileStream(fPath, FileMode.OpenOrCreate, FileAccess.Write); Byte[] filedata = new Byte[strFileLen]; afs.Write(filedata, 0, strFileLen); BinaryWriter abw; int iBufferSize=1000; Byte[] outbyte=new Byte[iBufferSize-1]; long retval; long starIndex=0; abw=new BinaryWriter(afs); starIndex=0; int itemNum=4; retval=myReader.GetBytes(itemNum,starIndex,outbyte,0,iBufferSize); //when i store large data into a file it display an error such as "Buffer offset '0' plus the bytes '82452' is greater than the length of the passed in buffer. abw.Write(outbyte); starIndex+=iBufferSize; retval=myReader.GetBytes(itemNum,starIndex,outbyte,0,iBufferSize); } abw.Write(outbyte); abw.Flush(); abw.Close(); afs.Close(); myReader.Close(); dbComm.Dispose(); } } } protected void Button1_Click(object sender, EventArgs e) { string strFileName; string strFileType; int strFileLen; Random ran=new Random(); string strFileISN=DateTime.Now.ToString("yyyyMMddhhmmss")+ran.Next(0,999); if(FileUpload1.PostedFile.FileName!=null) { strFileName=FileUpload1.PostedFile.FileName; strFileType=strFileName.Substring(strFileName.LastIndexOf(".")+1); strFileName=strFileName.Substring(strFileName.LastIndexOf("\")+1); strFileLen=FileUpload1.PostedFile.ContentLength; string strConn="Data Source=hao-pc;Initial Catalog=simpleBBS;Persist Security Info=True;User ID=sa;Password=123;Pooling=False"; SqlDataAdapter sda=new SqlDataAdapter(); DbProviderFactory dbProviderFactory=DbProviderFactories.GetFactory("System.Data.SqlClient"); DbConnection dbConn=dbProviderFactory.CreateConnection(); dbConn.ConnectionString=strConn; dbConn.Open(); DbCommand dbComm=dbProviderFactory.CreateCommand(); dbComm.Connection=dbConn; string dateTime=DateTime.Now.ToString(); Stream fs=FileUpload1.PostedFile.InputStream; Byte[] filedata=new Byte[strFileLen]; fs.Read(filedata,0,strFileLen); dbComm.CommandText="insert into userFiles2 (fileisn,filename,filetype,filesize,filecontent,uploadTime) values (@fileisn,@filename,@filetype,@filesize,@filecontent,@uploadTime)"; dbComm.Parameters.Add(new SqlParameter("@fileisn", (object)strFileISN)); dbComm.Parameters.Add(new SqlParameter("@filename",(object)strFileName)); dbComm.Parameters.Add(new SqlParameter("@filetype",(object)strFileType)); dbComm.Parameters.Add(new SqlParameter("@filesize",(object)strFileLen.ToString())); dbComm.Parameters.Add(new SqlParameter("@filecontent",(object)filedata)); dbComm.Parameters.Add(new SqlParameter("@uploadTime",(object)dateTime)); dbComm.ExecuteNonQuery(); fs.Close(); dbConn.Close(); dbComm.Dispose(); dbConn.Close(); } } }
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Mar 23, 2008
hi,
i would like to store images in my database and retirve them aswell. i have looked at examples on the net but i am finding it hard to follow and undertsand them, can anyone please give me adivse on how i can do this. i have alrady created my table in my database which has 4 fields pictureID, pictureContent, pictureType and pictureSize but i dont know where to go on from here. i want to do it in vb aswell.
please any help and advise would be much appreciated as i am stuck,
thank you
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Apr 24, 2008
Hi
I have a asp:FileUpload conponent that I am trying to use to retrieve a picture file from the clients pc and store it in a SQL database.
The table is called PropertyImage and it contains the following fields:
imgID (type = int - autoincrement); imgData (type = Image); imgTitle (type = VarChar); imgType (type = VarChar); imgLength (type = BigInt);
I have a button (Button1) which when clicked calls Button1_Click()
--------------------------------------------------protected void Button1_Click(object sender, EventArgs e)
{byte[] fileData = null;
Boolean status = false;if (FileUpload1 != null)
{
// Make sure the file has data.if ((FileUpload1.PostedFile != null) && (FileUpload1.PostedFile.ContentLength > 0))
{
// Get the filename.string fn = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
try
{
// Access the file stream and begin the upload. Store the file in a memory byte array.Stream MyStream = FileUpload1.PostedFile.InputStream;
long iLength = MyStream.Length;fileData = new byte[(int)MyStream.Length];MyStream.Read(fileData, 0, (int)MyStream.Length);
MyStream.Close();
}catch (Exception ex)
{ }
}
}SqlConnection connection = new SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\heidihomes.mdf;Integrated Security=True;User Instance=True");
try
{
connection.Open();SqlCommand sqlCmd = new SqlCommand("INSERT INTO PropertyImage (imgData, imgaTitle, imgType, imgLength) VALUES(@data,@title,@type,@length)");
SqlParameter param = new SqlParameter();
// String connectionString = new SqlConnection(sqlCmd, connection);
param = new SqlParameter("@data", SqlDbType.Image);
param.Value = fileData;
sqlCmd.Parameters.Add(param);param = new SqlParameter("@title", SqlDbType.VarChar);
param.Value = fileData;
sqlCmd.Parameters.Add(param);param = new SqlParameter("@type", SqlDbType.VarChar);
param.Value = fileData;
sqlCmd.Parameters.Add(param);param = new SqlParameter("@length", SqlDbType.BigInt);
param.Value = fileData;
sqlCmd.Parameters.Add(param);
sqlCmd.ExecuteNonQuery();
connection.Close();status = true;
}catch (Exception ex){ }if (status)
{
UploadStatus.Text = "File Uploaded Successfully";Server.Transfer("Admin_PropertyView.aspx");
}
else
{UploadStatus.Text = "Uploaded Failed";
}
}
}
--------------------------------------------------
But when I click on the button, nothing happens.
Please could someone help me out here. I have tried this a few times and still haven't come right.
Also, if there is something else wrong with the code, please let me know.
Thanking you in advance.
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Feb 1, 2005
Hi,
How to insert image into database?Anyone know how to do this, please kindly lead me and give me the solution to solve this problem. Thanks a lot.
p@ywen
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Mar 10, 2005
hi,friends
i need your help.
i want to store a date into sqlserver database using stored procedure.
when i run app.
it will give this error.......
----------------------------------
Server Error in '/aspnet/espms' Application.
--------------------------------------------------------------------------------
String was not recognized as a valid DateTime.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: String was not recognized as a valid DateTime.
Source Error:
Line 349: cmd.Parameters(6).Value = CType(ddldeltype.SelectedValue, Integer)
Line 350: cmd.Parameters(7).Value = txtshipnm.Text
Line 351: If cmd.ExecuteNonQuery Then
Line 352: add = True
Line 353: Else
Source File: c:inetpubwwwrootaspnetespmsprchspur_det_add.aspx.vb Line: 351
------------------------------
my source code is .....
---------------------------------------
- - - -
- - - -
cmd.CommandText = "add_v_dispatch_det"
cmd.Connection = conn
cmd.CommandType = CommandType.StoredProcedure
cmdbld.DeriveParameters(cmd)
cmd.Parameters(1).Value = prid
cmd.Parameters(2).Value = cd(1)
cmd.Parameters(3).Value = cd(3)
cmd.Parameters(4).Value = txtdeldt.text '(dd/MM/yyyy) i.e. "20/12/2005"
cmd.Parameters(5).Value = txtrecdt.text '(dd/MM/yyyy) i.e. "20/12/2005"
cmd.Parameters(6).Value =CType(ddldeltype.SelectedValue, Integer)
cmd.Parameters(7).Value =CType(ddldeltype.SelectedValue, Integer)
- - - -
- - - -
my stored procedure is ...
------------
CREATE PROCEDURE add_v_dispatch_det
@purid char(8),
@prcd char(20),
@qty varchar(5),
@deldt datetime,
@recdt datetime,
@deltype int,
@shipnm char(50)
AS
insert into vend_dispatch_detail
values(
@purid,
@prcd,
@qty,
@deldt,
@recdt,
@deltype,
@shipnm
)
GO
--------
what should i do?
plz give any solution.
thanks in advance.
it's urgent
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