With this example we are going to demonstrate how to determine if a ResultSet is updatable. An updatable ResultSet is a table of data representing a database result set, that can be updated by others. In short, to determine if a ResultSet is updatable 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 of the DriverManager to create the connection. - Get a result set containing all data from a specific table. Create a Statement, using the
createStatement()API method of the Connection. Execute the query to the database, using theexecuteQuery(String sql)API method of the Statement. The results of the query are set in a ResultSet. - In order to check if the ResultSet is updatable, use the
getConcurrency()API method. If it is equal to CONCUR_UPDATABLE then the ResultSet is updatable.
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 DetermineUpdatableResultSet {
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 concurrency of the result set
int concurrency = results.getConcurrency();
if (concurrency == ResultSet.CONCUR_UPDATABLE) {
System.out.println("Result set is updatable");
} else {
System.out.println("Result set is not updatable");
}
} catch (SQLException e) {
System.out.println("Could not execute statement " + e.getMessage());
}
}
}
Example Output:
Successfully Connected to the database!
Result set is not updatable
This was an example of how to determine if a ResultSet is updatable in Java.
