Java JDBC MySQL CRUD: Data Manipulation Examples
Java JDBC CRUD: MySQL Database Interaction
This document provides practical Java code examples demonstrating basic CRUD (Create, Read, Update, Delete) operations on a MySQL database using JDBC (Java Database Connectivity).
Each example connects to a local MySQL database named mydb
with user root
and an empty password. It’s important to note that for production environments, using PreparedStatement
is highly recommended to prevent SQL injection vulnerabilities, and sensitive credentials should not
Advanced SQL Queries for Database Analytics
This document presents a collection of practical SQL queries designed to extract valuable insights from a database, likely a music store schema such as Chinook. Each query demonstrates different SQL concepts, from basic data retrieval to complex joins, subqueries, and aggregations, providing solutions for common business questions.
Top 10 Customers by Spending (Over $40)
Identifies the top 10 customers who have spent more than $40 in total, ordered by their total expenditure in descending order.
SELECT
SQL Database Design & Query Examples
Library Database Schema Definition
This section outlines the SQL Data Definition Language (DDL) statements for creating a library database, including tables for publishers, distributors, customers, articles, books, journals, and rental records.
Database Setup
DROP DATABASE IF EXISTS library;
CREATE DATABASE IF NOT EXISTS library;
USE library;
Table Creation Statements
Below are the DDL statements for defining the various tables within the library
database, establishing relationships and constraints.
Publisher
Read MoreLinux Server Network Services Setup
DNS and DHCP Installation Exercise
This document outlines the steps to install and configure essential network services on a Linux server, including DNS (BIND), DHCP, HTTPD (Apache), and VSFTPD.
DNS Server Configuration (BIND)
1. Install BIND Packages
Begin by installing the necessary BIND packages using yum
:
[root@localhost ~]# yum -y install bind bind-chroot bind-libs caching-nameserver
2. Configure BIND Named.conf
Edit the main BIND configuration file to define your DNS zones:
[root@localhost ~]# vi
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Computer Fundamentals: Hardware, Software, and Data Processing
Computer Basics: Definitions and Types
What is a Computer?
An electronic device designed for performing operations on data at high speed.
Computer Types
- Desktop: The monitor and computer (tower) are separated. Non-portable.
- Laptop: The monitor and computer are integrated. Portable.
Core Computing Concepts
Hardware
The physical computer and its parts.
Software
Digital instructions to be run by the computer.
- Program: A piece of software.
- Operating System: A program for running other programs.
BIOS (Basic Input/
Read MoreDirect JDBC Connection to Microsoft Access Databases
Direct JDBC Connection to Microsoft Access Databases (.MDB)
Accessing .MDB Files Without ODBC Data Source Configuration
This document demonstrates how to establish a direct JDBC connection to a Microsoft Access database (.MDB file) in Java, bypassing the need for an ODBC data source setup in the system’s ODBC Data Source Administrator panel.
Java Class Definition
The main class, Access_sin_odbc
, encapsulates the database interaction logic.
import java.sql.*;
public class Access_sin_odbc {