Connect from Java to MySQL using Eclipse

I will explain how to operate MySQL in Java. This time I will install XAMPP in a Windows environment and use MySQL.

Advance preparation

-Installation of JDK ・ Installation of Eclipse ・ Installation of XAMPP -Preparation of JDBC driver

Eclipse preparation

1. Create a Java project

Create a new project to be used this time with ** "File (F)"> "New (N)"> "Java Project" ** on the upper left. image.png Make the project name easy to understand ** "MysqlTest" **. ** Click "Finish" ** to create.


2. Incorporate the JDBC driver into your project

Once the project is created, right-click on the project and select ** "Build Path (B)"> "Add External Archive (V) ..." ** to select the JDBC driver (mysql-connector-java-8.0). Open .19.jar). image.png image.png It is okay if ** mysql-connector-java-8.0.19.jar ** is added to the "reference library" directly under the project.

MySQL preparation

Start XAMPP and let MySQL ** "Start" **. image.png When you can start, click ** "Shell" ** on the right to start it. After starting, enter the following command to connect to MySQL as the root user. Please refer to this article for password settings.


mysql -u root -p

After connecting, create a database with the following command. This time we will create a database named ** "test_db" **.



If you can create it successfully, connect to the database you just created with the following command.


USE test_db;

The flow up to this point is as shown in the image below. image.png

Next, create a table and store the data. This time we will create a table called ** "test" **. Enter the following command. * Don't forget the comma! If you make a typo, interrupt it with ** "\ c" ** and re-enter it.


    id VARCHAR(3),
    name VARCHAR(10)

Once the table is created, we will store the data. Let's store 3 lines of data this time.


INSERT INTO test VALUES('001', 'Mandarin orange');
INSERT INTO test VALUES('002', 'Apple');
INSERT INTO test VALUES('003', 'Grape');

The flow up to this point is as shown in the image below. image.png

Let's check if the data is stored properly with the following command.



image.png MySQL is now ready.

Connect to MySQL from Java

Now you're ready to go. From here, let's create a Java program, access the database created earlier, and display the data in the table.

First, right-click ** "src" ** in the ** "MysqlTest" ** project that you created first, and select "New (W)"> "Package" to select the package "java_mysql" **. Create a. image.png

Next, right-click the package you just created and select ** "New (W)"> "File" ** to create a file called ** "" **.

image.png If you can do so far, I will write the contents of ** "" **. I wrote the meaning of the code in the comments.

package java_mysql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Test {

	public static void main(String[] args) {
    //Variable preparation
		Connection con = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;

    //SQL statement creation
		String sql = "SELECT * FROM test";

		try {
			//JDBC driver loading
			//Database connection
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test_db?serverTimezone=JST", "root", "root");
			//SQL execution preparation
			stmt = con.prepareStatement(sql);
			//Get execution result
			rs = stmt.executeQuery();

      //Until there is no data( becomes false)repeat
			while ( {
				String id = rs.getString("id");
				String name = rs.getString("name");

				System.out.println(id + ":" + name);
		} catch (ClassNotFoundException e) {
			System.out.println("An error occurred while loading the JDBC driver");
		} catch (SQLException e) {
			System.out.println("There was an error accessing the database.");
		} finally {
			try {
				if (con != null) {
			} catch (SQLException e) {
				System.out.println("There was an error accessing the database.");


After writing the code, save it, right-click ** "" ** and execute it from ** "Run"> "Java Application" **.

image.png If the following is displayed on the console, it is successful.


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