Computer Science Java and Ms Sql Server (JDBC)

1. Java Database Connectivity
Nangarhar University Computer Science
faculty
Fall semester 2014
Waheedullah Sulaimankhail

2. Overview
1. JDBC Introduction
2. JDBC Configuration
3. Practical Examples with JDBC

3. 1. JDBC introduction
 JDBC stands for Java Database
Connectivity, which is a standard
Java API for database-independent
connectivity between the Java
programming language and a wide
range of databases.
 The JDBC library includes APIs for each
of the tasks commonly associated with
database usage

4. How JDBC works
1. Registering JDBC Driver
2. Making a connection to a database
3. Creating SQL or MySQL statements
4. Executing that SQL or MySQL queries
in the database
5. Viewing & Modifying the resulting
records

5. 2. JDBC Configuration
 We will use eclipse and Microsoft Sql Server
 So please install Eclipse and Ms Sql Server

6. Configuration .
 Add Sql Server Path to environment variable.

7. Configuration ..
 Download JDBC driver for Ms Sqlserver
 Download the sqljdbc_<version>_enu.exe to a
temporary directory.
 Run sqljdbc_<version>_enu.exe (unzip it)

8. Configuration …
 Copy sqljdbc_auth.dll
 From this folder : …Microsoft JDBC Driver 4.0
for SQL Serversqljdbc_4.0enuauthx64
 To C: windows / System32 folder

9. Add JDBC Driver for Ms Sql Server to Project
properties in Eclipse

10. 3. Practical Examples with JDBC
 Setting Up JDBC Examples
 3 important steps to set up JDBC
1. Write the import statements
 import java.sql.*;
2. Register JDBC Driver
 Class.forName("com.microsoft.sqlserver.jdbc.SQL
ServerDriver");
3. Creating connection and opening it
 Connection con =
DriverManager.getConnection("jdbc:sqlserver://loc
alhost:1433;databaseName=db_name;integrated
Security=true","User","Pw");

11. Executing queries with JDBC
 After jdbc is set up we need to write queries and
execute them.
 In sql server we create query and execute them.
 However in JDBC we need to create a statement
and initialize the statement with object of
connection class.
 And execute the query with an object of
statement class.

12. Create statement and execute create
table query
 Statement st = con.createStatement();
 String query = "CREATE TABLE student " +
"(id INTEGER not NULL, " + " name
VARCHAR(255), " +
" fname VARCHAR(255), " + " grade
Varchar(255), " +
" PRIMARY KEY ( id ))" ;
 St.executeUpdate(query);
 System.out.println(“New Table with name student
is created ”);

13. Creating Select Query and executing
 Statement st= con.createStatement();
 String query= "SELECT id, first, last, age FROM
Employee";
 ….. = st.executeQuery(query);
 executeQuery method returns a dataset so we
need to store the outcome in a dataset
 We will rewrite the executeQuery method as
above
 ResultSet rs = st.executeQuery(query);
 Now we need to fetch the data from our result set

14. Fetching data from data set
 Rs.next() // will fetch the next record (next row)
 To get each record we will run a while loop till the
last record is reached
 While(rs.next()) {
 int id = rs.getInt("id"); // this will fetch the column
named “id”
 // the same for all other columns which we want
to fetch from this record
 System.out.println(“ID :”+id); // show the record
 }

15. Clearing the Environment
 Rs.close();
 St.close();
 Con.close();

16. Thanks for attention
Download these slides from :
https://app.box.com/s/62nb671lj6vsz23ylw7v