Java DatabaseMetaData getDefaultTransactionIsolation() method with example

JDBCJava 8Object Oriented ProgrammingProgramming

In a database system where more than one transaction is being executed simultaneously and in parallel, the property of isolation states that all the transactions will be carried out and executed as if it is the only transaction in the system. No transaction will affect the existence of any other transaction.

The getDefaultTransactionIsolation() method of the DatabaseMetaData interface returns the default isolation level of the underlying database in integer format.

To know the default transaction isolation of the underlying database −

  • Make sure your database is up and running.

  • Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.

  • Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.

  • Get the DatabaseMetaData object with respect to the current connection using the getMetaData() method of the Connection interface.

  • Finally get the isolation level of the database we have connected to, using the getDefaultTransactionIsolation() method of the DatabaseMetaData interface .

Example

Following JDBC program establishes connection with the database, retrieves and prints the default transaction isolation level of the underlying database.

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseMetaData_getDefaultTransactionIsolation {
   public static void main(String args[]) throws SQLException {
      //Registering the Driver
      DriverManager.registerDriver(new com.mysql.jdbc.Driver());
      //Getting the connection
      String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
      Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
      System.out.println("Connection established......");
      //Retrieving the meta data object
      DatabaseMetaData metaData = con.getMetaData();
      //retrieving the name of the database
      int product_name = metaData.getDefaultTransactionIsolation();
      System.out.println("Transaction isolation level of the underlying database: "+product_name);
   }
}

Output

Connection established......
Transaction isolation level of the underlying database: 2
raja
Published on 09-May-2019 14:57:31
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