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Tutorial

PreparedStatement

The PreparedStatement interface is a subinterface of Statement. It is used to execute parameterized query.

Let’s see the example of parameterized query:

String sql=”insert into emp values(?,?,?)”;

The performance of the application will be faster if you use PreparedStatement interface because query is compiled only once.

instance of PreparedStatement

The prepareStatement() method of Connection interface is used to return the object of PreparedStatement. Syntax:

public PreparedStatement prepareStatement(String query)throws SQLException{}

Methods of PreparedStatement interface

Example of PreparedStatement interface that inserts the record:

import java.sql.*;

class InsertPrepared

{

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”);

PreparedStatement stmt=con.prepareStatement(“insert into Emp values(?,?)”);

stmt.setInt(1,101); //1 specifies the first parameter in the query

stmt.setString(2,“Alok”);

int i=stmt.executeUpdate();

System.out.println(i+” records inserted”);

con.close();

}

catch(Exception e){ System.out.println(e);

}

}

}

Example of PreparedStatement interface that updates the record

PreparedStatement stmt=con.prepareStatement(“update emp set name=? where id=?”);

stmt.setString(1,“Alok”); //1 specifies the first parameter in the query i.e. name

stmt.setInt(2,101);

int i=stmt.executeUpdate();

System.out.println(i+” records updated”);

Example of PreparedStatement interface that deletes the record

PreparedStatement stmt=con.prepareStatement(“delete from emp where id=?”);

stmt.setInt(1,101);

int i=stmt.executeUpdate();

System.out.println(i+” records deleted”);

Example of PreparedStatement interface that retrieve the records of a table

PreparedStatement stmt=con.prepareStatement(“select * from emp”);

ResultSet rs=stmt.executeQuery();

while(rs.next())

{

System.out.println(rs.getInt(1)+” “+rs.getString(2));

}