Re: Know when data has changed in SQL Server - C# Discussion Boards

How to Insert Data into database with SingleFunction in C#

Phaneendra Varanasi3-Nov-09 1:36

3-Nov-09 1:36

Hi,
Can any one help to develop a method in C#, so that i can use that statement to INSERT - UPDATE - DELETE operations upon Database.
Smile | :)

I'd achieved this in JAVA but couldn't C#

Re: How to Insert Data into database with SingleFunction in C#

dan!sh 3-Nov-09 1:42

dan!sh

3-Nov-09 1:42

.Net provides namespaces like System.Data.OleDb and System.Data.SqlClient. These have a lot classes that will help doing these operations. Look into them. If you get stuck somewhere while trying, post the query. There are plenty of members here to help. Smile | :)

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Re: How to Insert Data into database with SingleFunction in C#

Md. Marufuzzaman3-Nov-09 3:24

Md. Marufuzzaman

3-Nov-09 3:24

Try the following...

<pre> public int ExecuteNonQuery(string strConnectionString
                                       , string strStoredProcedure
                                       , SqlParameter[] ObjSQLParameter)
            {
                  //   declare variables
                  SqlConnection ObjSqlConnection;
                  SqlCommand ObjSqlCommand;
                  int intRowsAffected = -1;

                  try
                  {
                        //   prepare a connection
                        ObjSqlConnection = new SqlConnection(strConnectionString);

                        //   open connection
                        ObjSqlConnection.Open();

                        //   prepare command
                        ObjSqlCommand = new SqlCommand(strStoredProcedure, ObjSqlConnection);
                        ObjSqlCommand.CommandType = CommandType.StoredProcedure;

                        //   asign parameters to command
                        //SqlParameter collObj ;
                        foreach (SqlParameter collObj in ObjSQLParameter)
                        {
                              ObjSqlCommand.Parameters.Add(collObj);
                        }

                        // execute command
                        intRowsAffected = ObjSqlCommand.ExecuteNonQuery();

                  }

                  catch ()
                  {

                        intRowsAffected = 0;
                  }
                  finally
                  {

                        ObjSqlCommand.Dispose();
                        ObjSqlConnection.Close();
                        ObjSqlConnection.Dispose();

                  }
                  //   return affected rows
                  return intRowsAffected;
            }
</pre>

Thanks
Md. Marufuzzaman

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Re: How to Insert Data into database with SingleFunction in C#

PIEBALDconsult3-Nov-09 3:57

PIEBALDconsult

3-Nov-09 3:57

Ew:

catch ()
{

    intRowsAffected = 0;
}

is a very bad idea; just allow the Exception to be thrown.

And why not use using statements for the command and connection?

Re: How to Insert Data into database with SingleFunction in C#

Md. Marufuzzaman3-Nov-09 5:56

Md. Marufuzzaman

3-Nov-09 5:56

I agree...it's happened due to modifying the code snippets.. Thanks

Thanks
Md. Marufuzzaman

Re: How to Insert Data into database with SingleFunction in C#

PIEBALDconsult3-Nov-09 3:53

PIEBALDconsult

3-Nov-09 3:53

Take a look at this[^].

Know when data has changed in SQL Server

Rob Ormond3-Nov-09 1:24

Rob Ormond

3-Nov-09 1:24

Hi,
I have an app that gets data out of the database. This data is updated via a separate application. At the moment the first application has to check every x seconds if there is any new data. I seem to remember reading a while ago something about subscribing to data changes or something so that instead of it being a pull from sql server, sql server actually notifies the app that there is new data and then the app can go get it, and therefore doesn't have to check itself.

Is that right, or did I dream that?

Cheers,
Rob

Re: Know when data has changed in SQL Server

dan!sh 3-Nov-09 1:35

dan!sh

3-Nov-09 1:35

I guess you are looking for SqlDependency or SqlNotificationRequest class.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Re: Know when data has changed in SQL Server

Rob Ormond3-Nov-09 2:08

Rob Ormond

3-Nov-09 2:08

Ahhh, that may well be it, thank you very much!

Re: Know when data has changed in SQL Server

Md. Marufuzzaman3-Nov-09 6:05

Md. Marufuzzaman

3-Nov-09 6:05

I agree...But i think using a trigger would be a good idea to keep track any alternation / insertion of data.

Thanks
Md. Marufuzzaman

Re: Know when data has changed in SQL Server

dan!sh 3-Nov-09 16:52

dan!sh

3-Nov-09 16:52

And how would that send notification to front end?

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Re: Know when data has changed in SQL Server

Md. Marufuzzaman3-Nov-09 18:24

Md. Marufuzzaman

3-Nov-09 18:24

so many ways you can do this... But I think your suggestion is excellent regarding this issue.

Thanks
Md. Marufuzzaman

Read SWF WITH C#

zahidhussain3-Nov-09 1:19

zahidhussain

3-Nov-09 1:19

i want to read text of buttons or lables of swf
which is running inside the shockwaveflash control.

Thanks,

zahid

Re: Read SWF WITH C#

Calla3-Nov-09 1:36

Calla

3-Nov-09 1:36

Ok.

Re: Read SWF WITH C#

zahidhussain3-Nov-09 1:40

zahidhussain

3-Nov-09 1:40

how can i do that?

zahid

Re: Read SWF WITH C#

Pete O'Hanlon3-Nov-09 2:05

Pete O'Hanlon

3-Nov-09 2:05

With code.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

What is the equivalant to constant string array in C#?

CelestialCoder3-Nov-09 0:32

CelestialCoder

3-Nov-09 0:32

Suppose I have a byte from USB device which holds the day of the week (1 to 7)
I need to print out Sunday to Saturday based on values 1 to 7. I MCU I create a look up table of strings or string array in ROM and access with index.

What is the method here. I think it is enum. But from tutorials I cant figure out how to get a string from a number like indexing.

Please suggest best way here.

Thanks

With Regards
Roy Thomas

"..this file is known as source file probably because it is a source of frustration and anxiety!" - Chuck Sphar - In book 'C# 2005 for Dummies'.

Re: What is the equivalant to constant string array in C#?

Luc Pattyn3-Nov-09 0:51

Luc Pattyn

3-Nov-09 0:51

Hi,

yes enum is fine since the strings you want are valid identifiers, hence:

enum Days {
    Monday=1,
    Tuesday=2,
    ...
}
public void Test() {
    for (int i=1; i<8; i++) Console.WriteLine(((Days)i).ToString());
}

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: What is the equivalant to constant string array in C#?

OriginalGriff3-Nov-09 0:57

OriginalGriff

3-Nov-09 0:57

There are several ways (here are two):

string[] weekdays = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
...
string day = weekdays[3];

enum Weekday
   {
   Sunday = 0,
   Monday,
   Tuesday,
   Wednesday,
   Thursday,
   Friday,
   Saturday
   };
...
string day = ((Weekday) 3).ToString();

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Re: What is the equivalant to constant string array in C#?

CelestialCoder3-Nov-09 1:35

CelestialCoder

3-Nov-09 1:35

Thanks a lot to all.

I got it. One clarification.

string[] weekdays = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
...
string day = weekdays[3];

If I use this method, is it creating a RAM string array? or is this array in ROM only? unlike a variable string?

I am using enum .

Thanks a lot

With Regards
Roy Thomas

"..this file is known as source file probably because it is a source of frustration and anxiety!" - Chuck Sphar - In book 'C# 2005 for Dummies'.

Re: What is the equivalant to constant string array in C#?

OriginalGriff3-Nov-09 1:47

OriginalGriff

3-Nov-09 1:47

Depends on your compiler. For Visual Studio, it will always be a RAM string, because it won't let you prefix it with "const" because it is a reference type and it (understandably) won't let you initialize const reference types other than string. Despite it being an array of strings. Grrr.

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This message is made of fully recyclable Zeros and Ones

Re: What is the equivalant to constant string array in C#?

Luc Pattyn3-Nov-09 1:49

Luc Pattyn

3-Nov-09 1:49

CelestialCoder wrote:
or is this array in ROM only?

on a PC the file system probably resides on a disk, and anything you load from disk is located in RAM; the only thing in ROM (or EEPROM) probably is the BIOS code.

However literal strings belong in code space, not data space. Code space could be write-protected at run-time.

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: What is the equivalant to constant string array in C#?

CelestialCoder3-Nov-09 20:30

CelestialCoder

3-Nov-09 20:30

Got it. Thanks for all the info.

Regards

With Regards
Roy Thomas

"..this file is known as source file probably because it is a source of frustration and anxiety!" - Chuck Sphar - In book 'C# 2005 for Dummies'.

Re: What is the equivalant to constant string array in C#?

Hristo-Bojilov3-Nov-09 1:19

Hristo-Bojilov

3-Nov-09 1:19

See Enum.GetValues and Enum.GetNames .

Life is a stage and we are all actors!

DataGridBoolColumn disable CheckBox

kantoz3-Nov-09 0:08

kantoz

3-Nov-09 0:08

Hi,

i have a question about the DataGrid and the DataGridBoolColumn.
Is it possible to disable a CheckBox shown in the DataGridBoolColumn? I get a result of a Database Query. If the Value is true or false the CheckBox should be enabled and the CheckBox is checked correctly, but if the value is NULL the CheckBox ist disabled and checked, i want to get a unchecked and disabled CheckBox in that case.

Thanks for your help!

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