Tutorialspoint

2 Answers
Arushi

Generally, Data about data is known as metadata. The DatabaseMetaData interface provides methods to get information about the database you have connected with like, database name, database driver version, maximum column length etc...

The getMetaData() method of the Connection interface retrieves and returns the DatabaseMetaData object. This contains information about the database you have connected to. You can get information about the database such as name of the database, version, driver name, user name and, url etc… by invoking the methods of the DatabaseMetaData interface using the obtained object.

This method returns the DatabaseMetaData object which holds information about the underlying database.

To get the DatabaseMetaData object for the underlying database.

Register the driver using the registerDriver() method of the DriverManager class as −

//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());

Get the connection using the getConnection() method of the DriverManager class as −

//Getting the connection
String url = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(url, "root", "password");

Get the metadata object using the getMetaData() method as −

DatabaseMetaData dbMetadata = con.getMetaData();

Following JDBC program establishes a connection with the database and retrieves information about the underlying database such as name of the database, driver name, URL etc…

Example

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Connection_getMetaData {
   public static void main(String args[]) throws SQLException {
      //Registering the Driver
      DriverManager.registerDriver(new com.mysql.jdbc.Driver());
      //Getting the connection
      String url = "jdbc:mysql://localhost/mydatabase";
      Connection con = DriverManager.getConnection(url, "root", "password");
      System.out.println("Connection established......");
      //Creating the DatabaseMetaData object
      DatabaseMetaData dbMetadata = con.getMetaData();
      //invoke the supportsBatchUpdates() method.
      boolean bool = dbMetadata.supportsBatchUpdates();
      if(bool) {
         System.out.println("Underlying database supports batch updates");
      } else {
         System.out.println("Underlying database doesn’t support batch updates");
      }
      //Retrieving the driver name
      System.out.println("Driver name: "+dbMetadata.getDriverName());
      //Retrieving the driver version
      System.out.println("Database version: "+dbMetadata.getDriverVersion());
      //Retrieving the user name
      System.out.println("User name: "+dbMetadata.getUserName());
      //Retrieving the URL
      System.out.println("URL for this database: "+dbMetadata.getURL());
   }
}

Output

Connection established......
Underlying database supports batch updates
Driver name: MySQL-AB JDBC Driver
Database version: mysql-connector-java-5.1.12 ( Revision: ${bzr.revision-id} )
User name: root@localhost
URL for this database: jdbc:mysql://localhost/mydatabase

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