Database management system (DBMS) using Bash-Script A simple queries to handel Database Management System using bash shell scripting that handles CRUD operations.

How to interact with our database query engine .

1- get the repo on your machine

• clone our repo

git clone git@github.com:Rowida46/dbEngine.git

• or download the source code.

2- add the folder of the source code to your environment variable path on your ~/.bashrc

• To open your _bashrc+ file

vi ~/.bashrc

or

code ~/.bashrc

• and then append the folder dir to your path environment variables

base=[project directory or path on your machine]
PATH="$base:$base/create:$base/connect:$base/drop:$base/list:$base/select:$base/update:$base/insert:$PATH"

• Create DB create database and then enter database name
• Connect DB connect database_name.
• Drop DB drop database_name
• List All DB list databases
• Create Table create table table_name
• Insert into Table insert into table_name
• Select from Table select all from table_name
• Update Table update table table_name
• List All Tables for the current connected database list tables
• Delete from Table drop tables table_name
• Drop Table drop table_name

create database database_name

After executing create database command a folder in your path directory will be created.

connect database_name

On connecting to a non-existent database, you will get this error message.

it doesn't exist!

• Create Table
• List Tables
• Insert into Table
• Select From Table
• Update Table
• Drop Table

You must enter the number of columns, spesify column name for each column as well as column data type ,by default the first column will be the Primay Key(PK) with data type as int. to create a new table, you need to first connect to a database

create table table_name

error massage for not connecting to database

you need to connect to a database first

insert into table_name

• After executing the previous command you will get the table's columns' name.
• You must enter data for all columns with a valid data as well as a matched data type for eac column.

select all from table_name

update table table_name

• After executing the previous command you will get the table's columns' name along with its data types
• You'll be asked about the number of pk ,row number , of the record that you need to change its data.
• And then you'll be asked about the column name and the value tha you need to change.
• The new Updated value must be a valid data and with a mutched data type for the spesified column.

Error massage for a not valid data type

not a valid column type