Merge pull request #9 from VisheshSaluja/DB_cmdl

DB using cmdl

content/english/blog/switch-db-cmdl.md

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+---
+title: "Switching Between H2, PostgreSQL, and MySQL Using Command-Line Arguments"
+meta_title: "Switching Between Databases in Geoweaver"
+date: 2024-10-28
+author: "Vishesh Saluja"
+tags: ["Database", "Configuration", "PostgreSQL", "MySQL", "H2"]
+draft: false
+---
+
+## Introduction
+
+In this guide, we will show how to switch between **H2**, **PostgreSQL**, and **MySQL** databases in Geoweaver using command-line arguments. This approach allows users to configure the database at runtime without modifying the `application.properties` file.
+
+Run the following commands by being in the same directory as geoweaver.jar file.
+
+## Using H2 Database
+
+The **H2** database is the default for Geoweaver. To use the H2 database, simply run Geoweaver without specifying a profile:
+
+```bash
+java -jar geoweaver.jar
+```
+
+## Using PostgreSQL
+
+### Step 1: Install PostgreSQL
+
+Ensure PostgreSQL is installed on your system. You can download it from the [official PostgreSQL website](https://www.postgresql.org/download/).
+
+### Step 2: Create a Database and User
+
+Open the PostgreSQL shell or use a database management tool like pgAdmin. Run the following commands to create a new database and user:
+
+```shell
+psql postgres
+```
+
+```sql
+CREATE USER my_user WITH PASSWORD 'my_password';
+CREATE DATABASE my_database OWNER my_user;
+```
+- To connect to the database use the below command
+
+```shell
+psql -U my_user -d my_database
+```
+
+
+enter \q to exit from the postgres shell
+
+### Step 3:
+To switch to PostgreSQL, you need to specify the PostgreSQL profile and provide database credentials through command-line arguments:
+
+```bash
+java -Dspring.profiles.active=postgresql -DDB_NAME=my_db -DDB_USERNAME=my_user -DDB_PASSWORD=my_password -jar geoweaver.jar
+```
+
+- DDB_NAME=my_db: Specifies the name of the PostgreSQL database.
+- DDB_USERNAME=my_user: Specifies the PostgreSQL database username.
+- DDB_PASSWORD=my_password: Specifies the PostgreSQL database password.
+
+
+
+## Using MySQL
+
+### Step 1: Install MySQL
+
+Ensure MySQL is installed on your system. You can download it from the [official MySQL website](https://dev.mysql.com/downloads/mysql/).
+
+
+### Step 2: Create a Database and User
+
+Open the MySQL shell or use a database management tool like MySQL Workbench. Run the following commands to create a new database and user:
+
+```shell
+mysql -u root -p
+```
+
+```sql
+CREATE DATABASE geoweaver_db;
+CREATE USER 'geoweaver_user'@'localhost' IDENTIFIED BY 'your_password';
+GRANT ALL PRIVILEGES ON geoweaver_db.* TO 'geoweaver_user'@'localhost';
+FLUSH PRIVILEGES;
+```
+
+### Step 3:
+To switch to MySQL, you need to specify the MySQL profile and provide database credentials through command-line arguments:
+
+```bash
+java -Dspring.profiles.active=mysql -DDB_NAME=gw_db -DDB_USERNAME=my_user -DDB_PASSWORD=my_password -jar geoweaver.jar
+```
+
+- DDB_NAME=my_db: Specifies the name of the MySQL database.
+- DDB_USERNAME=my_user: Specifies the MySQL database username.
+- DDB_PASSWORD=my_password: Specifies the MySQL database password.
+
+
+## Troubleshooting: Port already in use
+
+**Linux/macOS**
+
+Find the process running on port 8070:
+```bash
+sudo lsof -i :8070
+```
+This will show the process ID(PID) if the service using the port.
+
+To kill the process, use:
+```bash
+sudo kill -9 <PID>
+```
+
+**Windows**
+
+Find the process:
+```bash
+netstat -ano | findstr :8070
+```
+This will show the process ID(PID) if the service using the port.
+
+To stop the process, use:
+```bash
+taskkill /PID <PID> /F
+```
+