There are three ways to connect to a database using JDBC: 1) using a URL, 2) using a user ID and password, and 3) using properties. The URL method passes the full JDBC URL, driver class, and credentials to establish the connection. The user ID/password method loads the driver class, gets the connection using the URL, user name, and password, then gets and executes a statement. The properties method loads the driver class, gets the connection using a properties map containing the user name and password, then gets metadata about a table including its columns and types.

1. Connecting to database

3. How many ways to connecting db
• 1. using url
• 2. using userid,password
• 3.using properties

4. Using url
•
•
•
•
//connecting to the db using url
import java.sql.*;
class jdbcdemo
{
•
•
•
•
•
•
public static void main(String[] args) throws Exception
{
•
•
•
•
//Class.forName("oracle.jdbc.driver.OracleDriver");
//Connection conn = DriverManager.getConnection("jdbc:odbc:oracleXE","sai","sai");
//Connection conn =
DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","sai","sai" );
//
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root",
"admin");

5. • Statement st= con.createStatement();
•
•
•
•
•
• }
st.executeUpdate("insert into emp values(20,'sai',200)");
System.out.println("Rows inserteded");
st.close();
con.close();
• }
• //D:jdbc>set classpath=D:softwaresMySQLnewmysqlconnector-java-5.1.18-bin.jar
• //;.;

6. using userid,password
•
//connecting to the db using user id and password
•
•
•
•
import java.sql.*;
public class Ex2
{
public static void main(String arg[]) throws SQLException,
ClassNotFoundException
{
String driverClassName="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost:3306/test";
String userName="root";
String password="admin";
// String q="insert into students values(101,'kumar')";//or
// String q="insert into students values(102,'raj')";
//load driver class,
•
•
•
•
•
•
•
•
•

7. •
•
•
•
•
•
•
•
•
•
•
•
•
•
Class.forName(driverClassName);
//get the connection
Connection con=DriverManager.getConnection(url,userName,password);
//get the statement
Statement st=con.createStatement();
//execute the query
// int count=st.executeUpdate(q);
//or
int count=st.executeUpdate("insert into students values(103,'ram','sec')");
System.out.println("no of rows "+count);
//close the connection
con.close();
}//main
}//class

8. using properties
•
•
/* give any existing table name at runtime
* D:jdbcprogmonday>javac ResultSetMDEx.java
•
•
D:jdbcprogmonday>set classpath=D:softwaresMySQLnewmysql-connector-java-5.
1.18-bin.jar;.;
•
•
•
•
•
D:jdbcprogmonday>java ResultSetMDEx mytable
Table Name : mytable
id INT
name VARCHAR
add VARCHAR
•
•
•
•
•
D:jdbcprogmonday>
/
*/
import java.sql.*;
import java.util.*;
•
public class ResultSetMDEx {
•
•
•
public static void main(String s[]) throws Exception {
Class.forName("com.mysql.jdbc.Driver");

9. •
•
•
•
•
Properties p= new Properties();
p.put("user", "root");
p.put("password", "admin");
//DriverManager.getConnection(url,userName,password);
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test",p);
•
Statement st = con.createStatement();
•
•
ResultSet rs=st.executeQuery("select * from "+s[0]);
//Table name is taken as an command line arg
•
ResultSetMetaData rsmd=rs.getMetaData();
•
System.out.println("Table Name : "+s[0]);
•
int colcount=rsmd.getColumnCount();
•
•
•
•
for (int i=1;i<=colcount;i++) {
System.out.print(rsmd.getColumnName(i)+"t");
System.out.println(rsmd.getColumnTypeName(i));
}//for
•
•
•
con.close();
}//main
}//class