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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Determine if a ResultSet is scrollable

This is an example of how to determine if a ResultSet is Scrollable. Checking if a ResultSet is scrollable or not implies that you should:

  • Load the JDBC driver, using the forName(String className) API method of the Class. In this example we use the MySQL JDBC driver.
  • Create a Connection to the database. Invoke the getConnection(String url, String user, String password) API method DriverManager to create the connection.
  • Create a Statement, using the createStatement() API method of the Connection.
  • Execute the query to the database, using the executeQuery(String sql) API method of the Statement. The results of the query are set in a ResultSet.
  • Invoke the getType() API method of the ResultSet, in order to get the type of the result set. If the type is equal to TYPE_SCROLL_INSENSITIVE or TYPE_SCROLL_SENSITIVE, then the Result set is scrollable.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DetermineScrollableResultSet {
 
  public static void main(String[] args) {

    Connection connection = null;
    try {

  // Load the MySQL JDBC driver

  String driverName = "com.mysql.jdbc.Driver";

  Class.forName(driverName);


  // Create a connection to the database

  String serverName = "localhost";

  String schema = "test";

  String url = "jdbc:mysql://" + serverName +  "/" + schema;

  String username = "username";

  String password = "password";

  connection = DriverManager.getConnection(url, username, password);

  

  System.out.println("Successfully Connected to the database!");

  
    } catch (ClassNotFoundException e) {

  System.out.println("Could not find the database driver " + e.getMessage());
    } catch (SQLException e) {

  System.out.println("Could not connect to the database " + e.getMessage());
    }

    try {


  // Get a result set containing all data from test_table

  Statement statement = connection.createStatement();

  ResultSet results = statement.executeQuery("SELECT * FROM test_table");


  // Get type of the result set

  int type = results.getType();


  if (type == ResultSet.TYPE_SCROLL_INSENSITIVE || type == ResultSet.TYPE_SCROLL_SENSITIVE) {


System.out.println("Result set is scrollable");

  } else {


System.out.println("Result set is not scrollable");

  }

    } catch (SQLException e) {

  System.out.println("Could not retrieve data from the database " + e.getMessage());
    }

  }
}

Example Output:

Successfully Connected to the database!
Result set is not scrollable

 
This was an example of how to determine if a ResultSet is Scrollable in Java.

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