Java JDBC: Getting single record using JDBC Statement Interface

In this article, we will use JDBC API to fetch single record from newly created table in MySQL database from Java application (i.e.; using Statement Interface)

 

1. Pre-requisite:

  • Java JDK 1.8.0_77
  • MySQL database 5.5.16
  • Eclipse Luna IDE 4.4.0
  • mysql-connector-java-5.1.38.jar file

 

2. Database parameters:

Let us move on and code an example to connect MySQL database from Java application to fetch a single record using JDBC API. But before that, we will list down required things to connect database

  • database server IP or address (localhost)
  • sever port (3306)
  • database name (PLAYER_INFO)
  • username (root)
  • password (root@123)

Note: All bold are database values to connect MySQL database

 

3. Getting single record using JDBC Statement Interface

  • As we are ready with required things to connect MySQL database from Java application
  • We can use one of the methods from Statement Interface to execute “select a single record” SQL query
    1. execute(String sqlQuery);
    2. executeUpdate(String sqlQuery);
    3. executeQuery(String sqlQuery);
  • Let us code a simple example using Statement Interface

GetSingleRecordUsingJDBCStatement.java

package in.bench.resources.mysql.db.example;

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

public class GetSingleRecordUsingJDBCStatement {

	public static void main(String[] args) {

		// variables
		Connection connection = null;
		Statement statement = null;
		ResultSet resultSet = null;

		// Step 1: Loading or registering MySQL JDBC driver class
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
		}
		catch(ClassNotFoundException cnfex) {
			System.out.println("Problem in loading MySQL JDBC driver");
			cnfex.printStackTrace();
		}

		// Step 2: Opening database connection
		try {

			// Step 2.A: Create and get connection using DriverManager
			connection = DriverManager.getConnection(
         "jdbc:mysql://localhost:3306/PLAYER_INFO", "root", "root@123"); 

			// Step 2.B: Creating JDBC Statement 
			statement = connection.createStatement();

			// create SQL query to insert new PLAYER info
			String sqlSelectQuery = 
                               "SELECT * FROM PLAYER WHERE PLAYER_ID = 7";

			// Step 2.C: Executing SQL & retrieve data into ResultSet
			resultSet = statement.executeQuery(sqlSelectQuery);

			System.out.println("ID\tName\t\t\tAge\tMatches");
			System.out.println("==\t================\t===\t=======");

			// processing returned data and printing into console
			while(resultSet.next()) {
				System.out.println(resultSet.getInt(1) + "\t" + 
						resultSet.getString(2) + "\t" + 
						resultSet.getInt(3) + "\t" +
						resultSet.getInt(4));
			}
		}
		catch(SQLException sqlex){
			sqlex.printStackTrace();
		}
		finally {

			// Step 3: Closing database connection
			try {
				if(null != connection) {

					// cleanup resources, once after processing
					statement.close();

					// and then finally close connection
					connection.close();
				}
			}
			catch (SQLException sqlex) {
				sqlex.printStackTrace();
			}
		}
	}
}

Output:

ID	Name			Age	Matches
==	================	===	=======
7	Mahela Jayawardene	37	145

 

4. Download:

 

Read Also:

 

References:

 

Happy Coding !!
Happy Learning !!

Java JDBC: Updating a record using JDBC Statement Interface
Java JDBC: Getting all lists of record using JDBC Statement Interface