ForDevs

We a can get the list of all tables of a database in different ways : -

1.

SELECT *
FROM sys.TABLES

2.

SELECT *
FROM sysobjects
WHERE TYPE='U'

3.

SELECT *
FROM information_schema.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'

Popularity: 2% [?]

To view the existing triggers in the database

SELECT * FROM sys.triggers
OR
SELECT * FROM sysobjects WHERE xtype='TR'

To view the existing triggers in a specified table

sp_helptrigger tablename

To drop a trigger

DROP TRIGGER triggername

To drop more triggers at a time

DROP TRIGGER [trigger1],[trigger2],[trigger3]...[triggern]

Popularity: 3% [?]

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.

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.

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: 3% [?]

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: 1% [?]

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: 1% [?]

Database Creation :

Table Creation :

Procedure Creation :

Popularity: 1% [?]

When you want to create a stored procedure dynamically,we can create a stored procedure within a stored procedure.

Here in this example a new stored procedure with name ‘procTest’ which is passed in ‘procCreateProcedure’ is created and employee table is fectched when ‘procTest’ stored procedure is executed.

Popularity: 1% [?]