Java Database Connectivity with 5 Steps.pptx
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The document outlines the steps for Java Database Connectivity (JDBC) including registering the driver, creating a connection object, statement object, executing queries, and closing the connection. Examples for connecting to Oracle and MySQL databases are provided, illustrating the use of specific method calls. Additionally, it mentions the application of OWL 2 ontology for describing database management systems to assist in software engineering and database administration.
![EXAMPLE
import java.sql.*;
class OracleCon
{
public static void main(String args[])
{
Try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}
catch(Exception e)
{ System.out.println(e);
}
}
}](https://image.slidesharecdn.com/4-240525033739-a1d0c91d/85/Java-Database-Connectivity-with-5-Steps-pptx-9-320.jpg)
![import java.sql.*;
class MysqlCon{
public static void main(String args[]){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/
sonoo","root","root");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}catch(Exception e){ System.out.println(e);}
}
}](https://image.slidesharecdn.com/4-240525033739-a1d0c91d/85/Java-Database-Connectivity-with-5-Steps-pptx-11-320.jpg)
Java Database Connectivity with 5 Steps.pptx
- 1. Java Database Connectivity with 5 Steps By, R. Punithavel, AP/MCA
- 3. 1) Register the driver class • The forName() method of Class class is used to register the driver class. This method is used to dynamically load the driver class. Ex: Class.forName("oracle.jdbc.driver.OracleDriver");
- 4. 2) Create the connection object • The getConnection() method of DriverManager class is used to establish connection with the database. Ex: Connection con=DriverManager.getConnection( "jdbc:oracle:thin: @localhost:1521:xe","system","password");
- 5. 3) Create the Statement object • The createStatement() method of Connection interface is used to create statement. The object of statement is responsible to execute queries with the database. EX: Statement stmt=con.createStatement();
- 6. 4) Execute the query • The executeQuery() method of Statement interface is used to execute queries to the database. This method returns the object of ResultSet that can be used to get all the records of a table. EX: ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()) { System.out.println(rs.getInt(1)+" "+rs.getString(2)); }
- 7. 5) Close the connection object • By closing connection object statement and ResultSet will be closed automatically. The close() method of Connection interface is used to close the connection. con.close();
- 8. • OWL 2 ontology can be used to describe Database Management Systems (DBMS) in a machine-processable way. • This description can help with software engineering processes and database administration tasks, and can help decide which DBMS is best for a given set of requirements.
- 9. EXAMPLE import java.sql.*; class OracleCon { public static void main(String args[]) { Try { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle"); Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()) System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3)); con.close(); } catch(Exception e) { System.out.println(e); } } }
- 10. My SQL Connection Example
- 11. import java.sql.*; class MysqlCon{ public static void main(String args[]){ try{ Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/ sonoo","root","root"); Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery("select * from emp"); while(rs.next()) System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3)); con.close(); }catch(Exception e){ System.out.println(e);} } }