JDBC Execute Query
The Execute Query in JDBC retrieve the elements
from a database. In this Tutorial we want to describe you a code that helps you
to understand JDBC Execute Query, For this we have a class
JdbcExecutequery,Inside the main method, the list of steps that have to be done in order
to access the elements from database are
given below -Java.sql.* - This Java.sql*
package is imported that contain the definition for set of all classes and this
classes provides you the network connectivity between the database and
url.
Loading a Driver : The next step
is to load a driver by calling a Class.forname( ) and accept the argument
as driver class.When a driver is loaded, you connect the front end of your Java
application to the backend database.
con.setAutoCommit(false) : This method
is used to disable the commit method.
DriverManager.getConnection
( ) : The Driver Manager call get Connection ( ) method return a
connection object. This method is used to connect database and a Url.
con.createConnection( ) : This method provides
you an Sql object. Once a connection is built ,your application can
interact with backend database. A connection object is used to send and execute
SQL Statement to a backend database.
executeQuery (sql )
- This method is used to retrieve the element from a database by accepting
sql as argument.
rs.next
( ) - This method is used to retrieve the successively elements in series.
The
println print the value of the number, name and date of birth.In case there is
an exception occurred in loading a database driver in the try block.
The catch block check the exception and println print the exception. JdbcExecutequery.java.java
import java.sql.*;
public class JdbcExecutequery {
public static void main(String args[]) {
Connection con = null;
Statement st = null;
ResultSet rs = null;
String url = "jdbc:mysql://localhost:3306/";
String db = "komal";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try {
Class.forName(driver);
con = DriverManager.getConnection(url + db, user, pass);
con.setAutoCommit(false);
st = con.createStatement();
String sql = "select * from person";
rs = st.executeQuery(sql);
System.out.println("no. \tName \tDob");
while (rs.next()) {
System.out.print(rs.getString("id") + " \t");
System.out.print(rs.getString("cname") + " \t");
System.out.println(rs.getDate("dob"));
}
} catch (Exception e) {
System.out.println(e);
}
}
}
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Output
no. Name Dob
1 Girish 1984-06-02
2 komal 1984-10-27
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