How do I store BLOBs data into database?

By Wayan in JDBC 1 Comment

Database BLOBs (Binary Large Objects) can be used to store any data, such as image, audio or video files for instance. This example shows you how we use JDBC library to store image in our database. To send the binary information to the database we can call the PreparedStatement.setBinaryStream() method and pass the appropriate input stream and its size.

package org.kodejava.jdbc;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class BlobDemo {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "";

    public static void main(String[] args) {
        try (Connection conn =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            conn.setAutoCommit(false);

            String sql = "INSERT INTO product_images " +
                    "(product_id, name, description, image) VALUES (?, ?, ?, ?)";
            String image = "/uml-distilled-3rd-edition.jpg";

            try (PreparedStatement stmt = conn.prepareStatement(sql);
                 InputStream is = BlobDemo.class.getResourceAsStream(image)) {

                stmt.setLong(1, 1L);
                stmt.setString(2, "uml-distilled-3rd-edition.jpg");
                stmt.setString(3, "UML Distilled 3rd Edition");
                stmt.setBinaryStream(4, is);
                stmt.execute();

                conn.commit();
            } catch (Exception e) {
                conn.rollback();
                e.printStackTrace();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

The structure of product_images table.

CREATE TABLE `product_images`
(
    `id`          bigint(20) unsigned NOT NULL AUTO_INCREMENT,
    `product_id`  bigint(20) unsigned NOT NULL,
    `name`        varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
    `description` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
    `image`       blob,
    PRIMARY KEY (`id`),
    KEY `product_id` (`product_id`),
    CONSTRAINT `product_images_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `products` (`id`)
) ENGINE = InnoDB;

Maven dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.0.32</version>
</dependency>

Maven Central

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