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Statement interface

The Statement interface provides methods to execute queries with the database. The statement interface is a factory of ResultSet i.e. it provides factory method to get the object of ResultSet.

Commonly used methods of Statement interface:

The important methods of Statement interface are as follows:

1) public ResultSet executeQuery(String sql): is used to execute SELECT query. It returns the object of ResultSet.
2) public int executeUpdate(String sql): is used to execute specified query, it may be create, drop, insert, update, delete etc.
3) public boolean execute(String sql): is used to execute queries that may return multiple results.
4) public int[] executeBatch(): is used to execute batch of commands.

Example of Statement interface

Let’s see the simple example of Statement interface to insert, update and delete the record.

  1. import java.sql.*;
  2. class FetchRecord{
  3. public static void main(String args[])throws Exception{
  4. Class.forName(“oracle.jdbc.driver.OracleDriver”);
  5. Connection con=DriverManager.getConnection(“jdbc:oracle:thin:@localhost:1521:xe”,“system”,“oracle”);
  6. Statement stmt=con.createStatement();
  7. //stmt.executeUpdate(“insert into emp765 values(33,’Irfan’,50000)”);
  8. //int result=stmt.executeUpdate(“update emp765 set name=’Vimal’,salary=10000 where id=33”);
  9. int result=stmt.executeUpdate(“delete from emp765 where id=33”);
  10. System.out.println(result+” records affected”);
  11. con.close();
  12. }}
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