JDBC PS Update with execute

How do we perform SQL Update with the execute() method contained in a JDBC-PreparedStatement object.

  1. First you need to Create a Database Connection.
  2. With a DB connection, you must write the SQL Update statement and let this statement be the parameter to the below specified prepareStatement() method.
  3. If you have any parameter in your SQL statement, then it is time to set these using the PreparedStatement setXXX() methods.
  4. Now you can create a PreparedStatment object with the method:
    Method in Connection interface Description
    PreparedStatement prepareStatement(String sql) Creates a PreparedStatement object for sending parameterized SQL statements to the database.
  5. With the returned PreparedStatement object, you can execute the following method to perform the SQL Update statement:
    Method in PreparedStatement interface Description
    boolean execute() Executes the SQL statement in this PreparedStatement object, which may be any kind of SQL statement.
    Example of using this execute() and a PreparedStatement object to Update a database table:
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.PreparedStatement;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    
    public class SQLUpdate {
    
     public static void main(String[] args) {
      Connection conn = null;
      PreparedStatement stmt = null;
      try {
       // Register a driver for the MySQL database
       Class.forName("com.mysql.jdbc.Driver");
       // Create a url for accessing the MySQL
       // database CarDB
       String url = "jdbc:mysql://localhost:3306/CarDB";
       // user and password to access the database
       String username = "root";
       String password = "root";
       // User the DriverManager to get a Connection to the database
       conn = DriverManager.getConnection(url, username, password);
       // Create a  PreparedStatement with a SQL that
       // Calculate NewPrice for all cars
       stmt = conn.prepareStatement("Update CarPark Set newPrice=dayPrice*?");
       stmt.setDouble(1, 0.8);
       // using execute() in the PreparedStatement object
       boolean result = stmt.execute();
       // if result false it is a Update - not ResultSet
       if (!result) {
        System.out.println("New price for all cars are calculated");
       }
       // Create a  PreparedStatement with a SQL that
       // that returns
       // all the columns  from the dB table Carpark
       // using the execute() method in the PreparedStatement object
       stmt = conn.prepareStatement("select * from Carpark ");
       result = stmt.execute();
       ResultSet resultSet = null;
       // if result true it is a ResultSet
       if (result) {
        resultSet = stmt.getResultSet();
       }
       // As cursor is at the before first row position
       // we use the next() method to
       // test and read the first row in the ResultSet.
       if (resultSet.next()) {
        // Then we use a loop to retrieve rows and column data
        // and creates a html coded table output
        System.out.println("<table border='1' >");
        do {
         System.out.println("<tr>");
         System.out.print("<td>" + resultSet.getString("regNo") + "</td>");
         System.out.print("<td>" + resultSet.getString("cartype") + "</td>");
         System.out.println("<td>" + resultSet.getInt("model") + "</td>");
         System.out.println("<td>" + resultSet.getDouble("dayPrice") + "</td>");
         System.out.println("<td>" + resultSet.getDouble("newPrice") + "</td>");
         System.out.println("</tr>");
        } while (resultSet.next());
        System.out.println("</table>");
       }
    
      } catch (ClassNotFoundException ex) {
       Logger.getLogger(SQLUpdate.class.getName()).
               log(Level.SEVERE, null, ex);
      } catch (SQLException e) {
       e.printStackTrace();
      } finally {
       try {
        // Close the Statement, which also close the ResultSet
        stmt.close();
        conn.close();
       } catch (Exception xe) {
        xe.printStackTrace();
       }
      }
     }
    }

    You should use the close() method in the Statement object when you do not need it anymore.

    You should also use the close() method in the Connection object when you do not need it anymore.

    You can download this example here (needed tools can be found in the right menu on this page).

    If we run this application the result should be:
    As pure output Translated by a Browser
    <table border='1'>
    <tr >
    <td>DE12345</td><td>AUDI</td><td>2003</td>
    <td>250.0</td>
    <td>200.0</td>
    </tr>
    <tr >
    <td>AD23443</td><td>BMW</td><td>2001</td>
    <td>300.0</td>
    <td>240.0</td>
    </tr>
    <tr >
    <td>DE23453</td><td>FORD</td><td>2002</td>
    <td>375.0</td>
    <td>300.0</td>
    </tr>
    <tr >
    <td>RE23456</td><td>FORD</td><td>2005</td>
    <td>350.0</td>
    <td>280.0</td>
    </tr>
    <tr >
    <td>CE23473</td><td>AUDI</td><td>2001</td>
    <td>400.0</td>
    <td>320.0</td>
    </tr>
    <tr >
    <td>DE34562</td><td>OPEL</td><td>2001</td>
    <td>340.0</td>
    <td>272.0</td>
    </tr>
    <tr >
    <td>AX72345</td><td>AUDI</td><td>2003</td>
    <td>350.0</td>
    <td>280.0</td>
    </tr>
    <tr >
    DE12345AUDI2003 250.0 200.0
    AD23443BMW2001 300.0 240.0
    DE23453FORD2002 375.0 300.0
    RE23456FORD2005 350.0 280.0
    CE23473AUDI2001 400.0 320.0
    DE34562OPEL2001 340.0 272.0
    AX72345AUDI2003 350.0 280.0
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