https://github.com/aswajith7077/dbshell

A SQL-based command line system using C and bash script. Integrated concurrency control using file locking mechanisms. Command line parsing is done using the readline library in C.
https://github.com/aswajith7077/dbshell

c shell-script sql

Last synced: over 1 year ago
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A SQL-based command line system using C and bash script. Integrated concurrency control using file locking mechanisms. Command line parsing is done using the readline library in C.

• Host: GitHub
• URL: https://github.com/aswajith7077/dbshell
• Owner: Aswajith7077
• Created: 2025-01-17T06:05:23.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-01-17T06:32:28.000Z (over 1 year ago)
• Last Synced: 2025-01-29T09:40:55.070Z (over 1 year ago)
• Topics: c, shell-script, sql
• Language: C
• Homepage:
• Size: 56.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
 # **Basic Implementation of Database in shell script**

 The script immediately runs authentication function that will keep track of users and

 stores them into a log file.

 A database file consist of contents of database

- Administrators can alone create the database file.

- Other Users cannot create or delete the database file.

- Other Users can create a SQL file and perform queries that modifies the

 contents of the database file.

Then a database shell is created and the shell can perform the following operations:

 1. If the user is a database administrator, he can perform a CREATE USER to create

 a user.

 2. **EXIT**: can terminate the shell

 3. **LOGOUT**: can logout from the database user.

 4. **PERFORM** *filename*: Opens up a new window to write SQL Queries.

 5. **COMPILE** *filename*: Runs the file with SQL Queries.

 6. Any invalid operation will create a log entry with an alert message.

 

The Default administrator is given by,

1. **USERNAME**: SYS

2. **PASSWORD**: *Created by the first user*

 

 For a User Can perform the following operations in a SQL file:

 1. INSERT INTO *table_name* VALUES(*value_1*, *value_2*, *value_3*,...);

    - Inserts the list of values to the given table name

 2. UPDATE INTO *table_name*:

    - Updates a value to the attribute--

    - Can specify a WHERE condition to sort out the records.

 3. SELECT:

    - Should specify the attributes----

    - ***ORDERBY*** sorts the file according to the order specified based on the specified field.

    - ***WHERE CONDITION*** selects the specifies records from the database

    - ***GROUPBY*** groups the records based on a particular field

    - ***HAVING*** conditions for a ***GROUP BY***

 4. DELETE:

    - Deletes all the records by default.

    - WHERE sorts out the records based on the field

   

# **How to Run**

1. Compile the C program,

   ```

   gcc user.c

   ```

2. Then finally run the bash script

   ```

   bash ./sample.sh

   ```