Java DatabaseMetaData getMaxStatements() method with example.

In this article, we will learn how to retrieve the maximum number of open statements allowed by a database using the DatabaseMetaData interface in Java. The getMaxStatements() method of the DatabaseMetaData interface is used to find out the maximum number of open statements (objects) that the underlying database allows at one time. This method returns an integer value, representing the maximum number of statements that are allowed to be open at a time. If this value is 0 it indicates that there is no limit or, the limit is unknown.

Problem Statement

Given a connection to a database, write a Java program to retrieve the maximum number of open statements allowed at a time using the getMaxStatements() method.
Input

No specific user input; the program will connect to a database and retrieve metadata.

Output

The maximum number of open statements allowed by the database.

Steps to retrieve the maximum number of open statements

The following are the steps to retrieve the maximum number of open statements

• 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 of the database and, the user name, and 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.

Java program to retrieve the maximum number of open statements

The following JDBC example connects to the MySQL database and retrieves and prints the maximum number of statements that can be opened at the same time.

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseMetadata_getMaxStatements {
   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......");
      //Retrieving the meta data object
      DatabaseMetaData metaData = con.getMetaData();
      //Retrieving the maximum number of the statements that can be open at the same time
      int maxStatements = metaData.getMaxStatements();
      System.out.println("Maximum number of the statements that can be open at the same time: "+maxStatements);
   }
}

Output

Connection established......
Maximum number of the statements that can be open at the same time: 0

Code Explanation

In the code, we first register the MySQL driver so that Java can connect to the database. Then, we establish a connection using the database's URL, username, and password. Once connected, we get the database's metadata using getMetaData(). From this metadata, we use the getMaxStatements() method to find out how many statements can be opened at the same time. The result, which is printed, shows this number (in this case, 0, meaning no limit or an unknown limit).