Author Archive

JSON Data types and Example

January 12th, 2009 admin

The following are the Basic JSON Data types,

  • Number : integer, real, or floating point
  • String : double-quoted Unicode with backslash escaping
  • Boolean : true and false
  • Array : an ordered sequence of values, comma-separated and enclosed in square brackets
  • Object : collection of key:value pairs, comma-separated and enclosed in curly braces
  • null

Example

{
"firstName": "Praveen",
"lastName": "C",
"address": {
"streetAddress": "KK Nagar",
"city": "Chennai",
"state": "TN",
"postalCode": 6310102
},
"phoneNumbers": [
"091 98943 37266"
]
}

Popularity: 2% [?]

Posted in Javascript Tags: , No Comments »

What is JSON?

January 12th, 2009 admin

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition – December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others.

Popularity: 1% [?]

Posted in Javascript, What-is Tags: , No Comments »

Get available server names of Sql Server within the local network – SqlDataSourceEnumerator

January 7th, 2009 admin

SqlDataSourceEnumerator is a class in .net framework that gets the available instances of SQL Server within the local network.

DataTable dt = SqlDataSourceEnumerator.Instance.GetDataSources();

SqlDataSourceEnumerator.Instance.GetDataSources() returns a datatable with the available servers in the current network.

The DataTable returned as 4 colunms such as :-

  • ServerName
  • InstanceName
  • IsClustered
  • Version

Popularity: 2% [?]

Posted in C# Tags: No Comments »

Sorting Program using C#

January 2nd, 2009 admin 
namespace SortingNos
{
   class Program
   {
       static void Main(string[] args)
       {
           Console.WriteLine("Enter Numbers :");
           int[] arr = new int[5];
           string arr1 = "";
           for (int i = 0; i < 5; i++)
 {
 arr1 = Console.ReadLine();
 arr[i] = Convert.ToInt32(arr1);            
}
 
 int a, b, temp = 0;
 Console.WriteLine();
 for (a = 0; a < arr.Length; a++)
           {
                               for(b=a+1;b< arr.Length;b++)
               {
                   if (arr[a] > arr[b])
                   {
                       temp = arr[a];
                       arr[a] = arr[b];
                       arr[b] = temp;
                   }
               }             
               Console.WriteLine(arr[a]);              
           }          
          Console.ReadLine();
       }
   }
}

Download

Popularity: 4% [?]

Posted in C# Tags: No Comments »

Create backup copy of table in SQLServer – (Select Into)

December 29th, 2008 admin

SELECT INTO statement can be used to create backup copy of a table.This sql statement selects records from one table according to the selection we make and inserts the result set into another new table with the table name we specify.

Syntax given below is used to make a exact copy of the table.That is it creates the table with the same no of columns and all records in the old table.

Syntax : Exact copy of old table

SELECT *
INTO new_table_name
FROM old_table_name

Example :

select * into employee_backup from employee

In this example a exact copy of the table employee is backed up as a new table employee_backup.

Syntax given below is used to make a new table with selected columns from old table.

Syntax : Selected columns from old table

SELECT column_name(s)
INTO new_table_name
FROM old_table_name

Example :

select employee_id,employee_name into employee_backup from employee

In this example a copy of the table employee with only columns “employee_id,employee_name” is backed up as a new table employee_backup.

Popularity: 9% [?]

Posted in Sql Server Tags: , No Comments »

Open a File at any format in JSP

December 22nd, 2008 admin

How to Open a File in Different Format

1.Create a HTML Page or JSP Page
2.Insert <%@ page contentType=”application/vnd.ms-excel” %> instead of <%@ page contentType=”application/html” %> in HTML Page or JSP Page
3.Open a File,Now its open in a Excel Sheet with Style apply in the Sheet.

For Microsoft Word

<%@ page contentType=”application/vnd.msword” %>

For PDF File

<%@ page contentType=”application/vnd.pdf” %>

For Wordpad

<%@ page contentType=”application/vnd.rtf” %>

For Microsoft Powerpoint

<%@ page contentType=”application/vnd.ms-powerpoint” %>

For Winzip

<%@ page contentType=”application/vnd.zip” %>

Popularity: 3% [?]

Posted in JSP No Comments »

Usage of Stored Procedures

December 16th, 2008 admin

Reduce network traffic: You have to send the SQL statement across the network. With sprocs, you can execute SQL in batches, which is also more efficient.

Caching query plan: The first time the stored procedure is executed, SQL Server creates an execution plan, which is cached for reuse. This is particularly performant for small queries run frequently.

Ability to use output parameters: If you send inline SQL that returns one row, you can only get back a recordset. With stored procedures you can get them back as output parameters, which is considerably faster.

Permissions: When you send inline SQL, you have to grant permissions on the table(s) to the user, which is granting much more access than merely granting permission to execute a stored procedure

Separation of logic: Remove the SQL-generating code and segregate it in the database.

Ability to edit without recompiling: This can be controversial. You can edit the SQL in a sproc without having to recompile the application.

Find where a table is used: With stored procedures, if you want to find all SQL statements referencing a particular table, you can export the stored procedure code and search it. This is much easier than trying to find it in code.

Optimization: It’s easier for a DBA to optimize the SQL and tune the database when stored procedures are used. It’s easier to find missing indexes and such.

SQL injection attacks: Properly written inline SQL can defend against attacks, but stored procedures are better for this protection.

Popularity: 2% [?]

Posted in Sql Server IQ, What-is Tags: No Comments »

How to Upload File in Asp.net

December 12th, 2008 admin

Here in this example we browse a file from our pc and upload that file to some other location in our pc.

Default.aspx

<input type=file id=File1 name=File1 runat=”server”>
<input type=”submit” id=”Submit1″ value=”Upload” runat=”server” name=”Submit1″>

Defalut.aspx.cs

protected void Submit1_ServerClick(object sender, EventArgs e)
{
if( ( File1.PostedFile != null ) && ( File1.PostedFile.ContentLength > 0 ) )
{
string fn = System.IO.Path.GetFileName(File1.PostedFile.FileName);

//Create Data Folder within the Location u Specified
string SaveLocation = “D:\UploadedFiles” + “\” + fn;

//File will be Uploaded to the Specified Location
try
{
File1.PostedFile.SaveAs(SaveLocation);
Response.Write(“The file has been uploaded.”);
}
catch ( Exception ex )
{
Response.Write(“Error: ” + ex.Message);
}
}
else
{
Response.Write(“Please select a file to upload.”);
}
}

You can give the specified location to upload in SaveLocation string.

Download

Popularity: 1% [?]

Posted in Asp.net Tags: No Comments »

Simple Add,Edit,Retrieve and Delete in Asp.net

December 9th, 2008 admin

Here is a example application of Add,Edit,Retrieve and Delete operations using Asp.net. Download Creating a table employeeinfo for proceeding the operations. Sql Table Creation 

CREATE TABLE employeeinfo ( empid int NOT NULL PRIMARY KEY, empname varchar(50), empaddress varchar(200), empsalary int )

Declaring Connection String and Variables

Namespace : using System.Data.SqlClient;  string QryStr = ""; SqlConnection con = new SqlConnection("Server=servername;Integrated Security=true;Database=employee"); SqlCommand cmd; SqlDataReader dr;

In this example i have used windows authentication.You have to change the connection string according your specification. Adding Records

QryStr = "INSERT INTO employeeinfo VALUES('" +txtEmpId.Text + "','" + txtEmpName.Text + "','" + txtEmpAdd.Text + "','" + txtEmpSal.Text + "')"; con.Open(); cmd = new SqlCommand(QryStr, con); cmd.CommandType = CommandType.Text; cmd.ExecuteNonQuery(); con.Close();

Updating Records

QryStr = "UPDATE employeeinfo SET empname = '"+txtEmpName.Text+"',empaddress = '"+txtEmpAdd.Text+"',empsalary = '"+txtEmpSal.Text+"' WHERE empid = '"+txtEmpId.Text+"'"; con.Open(); cmd = new SqlCommand(QryStr, con); cmd.CommandType = CommandType.Text; cmd.ExecuteNonQuery(); con.Close();

Retrieve Records to textboxes Records will be Retrieved from the database and displayed in the text boxes when text change of employee id is fired.

QryStr = "SELECT * FROM employeeinfo WHERE empid = '" + txtEmpId.Text + "'";  con.Open(); cmd = new SqlCommand(QryStr, con); dr = cmd.ExecuteReader(); dr.Read(); if (dr.HasRows) { txtEmpName.Text = dr["empname"].ToString(); txtEmpAdd.Text = dr["empaddress"].ToString(); txtEmpSal.Text = dr["empsalary"].ToString(); } else { txtEmpName.Focus(); } con.Close();

Deleting Records

QryStr = "DELETE FROM employeeinfo WHERE empid = '" + txtEmpId.Text + "'"; con.Open(); cmd = new SqlCommand(QryStr, con); cmd.CommandType = CommandType.Text; cmd.ExecuteNonQuery(); con.Close();

Popularity: 2% [?]

Posted in Asp.net Tags: , No Comments »

Click Label to Access Form Control

December 3rd, 2008 admin

1.Using the label element allows the user to click on the text associated with the form control instead of having to click the radio button, check box, select box, etc.

2.To associate a label with another control implicitly, the control element must be within the contents of the Label element. In this case, the Label may only contain one control element. The label itself may be positioned before or after the associated control.

Example:-

<html>
<body>
// For Radio Button
<label for=”radio1″>Radio Button – Click this Label</label>
<input type=”radio” value=”Selected” name=”Radio” id=”radio1″>
// For CheckBox
<label for=”check”>Checkbox – Click this Label</label>
<input type=”checkbox” value=”Selected” name=”check” id=”check”>
</body>
</html>

Demo Link

Popularity: 8% [?]

Posted in HTML No Comments »
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