 
-- create
CREATE TABLE EMPLOYEE (
  empId INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  dept TEXT NOT NULL
);

-- insert
INSERT INTO EMPLOYEE VALUES (0001, 'Clark', 'Sales');
INSERT INTO EMPLOYEE VALUES (0002, 'Dave', 'Accounting');
INSERT INTO EMPLOYEE VALUES (0003, 'Ava', 'Sales');

-- fetch 
SELECT * FROM EMPLOYEE WHERE dept = 'Sales';
import mysql.connector as sqlctr
import sys
from datetime import datetime
mycon = sqlctr.connect(host='localhost', user='root', password='admin')
if mycon.is_connected():
    print('\n')
    print('Successfully connected to localhost')
else:
    print('Error while connecting to localhost')
cursor = mycon.cursor()
#creating database
cursor.execute("create database if not exists pathsala")
cursor.execute("use pathsala")
#creating the tables we need
cursor.execute("create table if not exists books(SN int(5) primary key,Book_Name varchar(30), Quantity_Available int(10),Price_Per_Day int(10))")
cursor.execute("create table if not exists BORROWER(SN int(5),borrowers_name varchar(40),book_lent varchar(20),contact_no int(10))")
def command(st):
    cursor.execute(st)
def fetch():
    data = cursor.fetchall()
    for i in data:
        print(i)
def all_data(tname):
    li = []
    st = 'desc '+tname
    command(st)
    data = cursor.fetchall()
    for i in data:
        li.append(i[0])
    st = 'select * from '+tname
    command(st)
    print('\n')
    print('-------ALL_DATA_FROM_TABLE_'+tname+'_ARE-------\n')
    print(tuple(li))
    fetch()
def detail_burrower(name,contact):
    tup=('SN','borrowers_name','book_lent','date','contact_no')
    print('\n---Details for borrower '+name+'---\n')
    print(tup)
    st='select * from borrower where borrowers_name like "{}" and contact_no={}'.format(name,contact)
    command(st)
    fetch()
def days_between(d1, d2):
    d1 = datetime.strptime(d1, "%Y-%m-%d")
    d2 = datetime.strptime(d2, "%Y-%m-%d")
    global days
    days=abs((d2 - d1).days)
def price_book(days,book_name):
    st1 = 'select Price_Per_Day from books where Book_Name="{}"'.format(book_name)
    command(st1)
    data = cursor.fetchall()
    for i in data:
        global t_price
        t_price=int(i[0])*days
        print('No. of days {} book is kept : {}'.format(book_name,days))
        print('Price per day for book {} is Rs.{}'.format(book_name,i[0]))
        print('Total fare for book '+book_name +'-',t_price)
def lend():
    flag='True'
    while flag=='True':
        print('\n___AVAILABLE BOOKS___\n')
        st0 = 'select Book_Name from books where Quantity_Available>=1'
        command(st0)
        fetch()
        st1='select max(SN) from borrower'
        command(st1)
        data_sn=cursor.fetchall()
        for i in data_sn:
            SN=i[0]+1        
        book_selected=str(input('Enter name of book from above list : '))
        borrowers_name=str(input('Enter Borrower Name : '))
        date=str(input('Enter date (YYYY-MM-DD) : '))
        contact=int(input('Enter contact no. : '))
        st_insert='insert into borrower values({},"{}","{}","{}",{})'.format(SN,borrowers_name,book_selected,date,contact)
        command(st_insert)
        st_quantity='select quantity_available from books where book_name="{}"'.format(book_selected)
        command(st_quantity)
        data_quantity=cursor.fetchall()
        for quantity in data_quantity:
            qty=quantity[0]-1
        st_dec='update books set quantity_available={} where book_name="{}"'.format(qty,book_selected)
        command(st_dec)
        dec=str(input('Do you want to add more records (Y/N) : '))
        if dec.upper=="Y":
            flag= 'True'
        else:
            flag='False'
        
def borrowers():
    print('\n\n___OPTIONS AVAILABLE___\n\nEnter 1 : To Show detail of all borrowers \nEnter 2 : To check detail of a particular borrower \nEnter 3 : To calculate total fine of a borrower \nEnter 4 : To go Back \nEnter 5 : To commit all the changes and exit')
    dec = input('enter your choice-')
    if dec=='1':
        all_data('borrower')
    elif dec=='2':
        name = str(input('\nenter borrower name-'))
        contact = str(input('enter borrower contact no.-'))
        detail_burrower(name,contact)
    elif dec=='3':
        tfine()
    elif dec=='4':
        action_list()
    elif dec=='5':
        close()
    borrowers()
def tfine():
    name=str(input('\nEnter borrower name : '))
    contact=input('Enter borrower contact_no : ')        
    detail_burrower(name, contact)
    st1 = 'select book_lent from borrower where borrowers_name ="{}" and contact_no={}'.format(name,contact)
    command(st1)
    data=cursor.fetchall()
    for i in data:
        book_name=i[0]
        st2 = 'select date from borrower where borrowers_name="{}" and book_lent="{}"'.format(name,book_name)
        command(st2)
        data1=cursor.fetchall()
        for date in data1:
            date_taken=date[0]
            date_return = str(input('\nEnter returning date for book "{}" (YYYY-MM-DD) , Press ENTER to skip-'.format(book_name)))
            while date_return!='':
                days_between(str(date_return),str(date_taken))
                price_book(days,i[0])
                print('\nEnter Y : If Rs.{} is paid and book is returned.\nEnter N : If fare is not paid and book is not returned.'.format(t_price))
                dec=str(input('Enter (Y?N) : ')) 
                if dec.upper()=="Y":
                    st= 'select SN , Quantity_Available from books where Book_Name ="{}"'.format(i[0])
                    command(st)
                    data2=cursor.fetchall()
                    for price in data2:
                        update('books', 'Quantity_Available',price[1]+1,price[0])
                    st_del = 'delete from borrower where borrowers_name="{}" and book_lent="{}"'.format(name,book_name)
                    command(st_del)
                    break
                else:
                    print("\n\nPLEASE PAY THE FARE AND RETURN BOOK AFTER READING.\n\n")
                    break
        
def insert():
    flag = 'true'
    while flag=='true':
        licol=[]
        li1=[]
        li_val=[]
        command('desc books')
        data=cursor.fetchall()
        for i in data:
            licol.append(i[0])   
        command('select max(SN) from books')
        dta=cursor.fetchall()
        for j in dta:
            li_val.append(j[0]+1)
        for k in range(1,4):
            val = str(input('Enter '+licol[k]+'-'))
            li_val.append(val)
        li1.append(tuple(li_val))
        values = ', '.join(map(str, li1))
        st1 = "INSERT INTO books VALUES {}".format(values)
        command(st1)
        all_data('books')
        print('\n')
        print("\nDATA INSERTED SUCCESSFULLY\n")
        dec = str(input('Do u want to insert more data?(Y/N)-'))
        if dec.upper() == "Y":
            flag='true'
        else:
            flag='false' 
    action_list()
def update(tname,col1,post_value,pre_value):
    st = str('update %s set %s=%s where SN=%s') % (tname, col1, "'%s'", "'%s'") % (post_value, pre_value)
    command(st)
    all_data(tname)
    print('\nVALUE UPDATED SUCCESSFULLY')
     
def close():
    mycon.commit()
    mycon.close()
    if mycon.is_connected():
        print('still connected to localhost')
    else:
        print('\n\nconnection closed successfully.')
    sys.exit()
def action_list():
    print('\n')
    print('#### WELCOME TO LIBRARY MANAGEMENT SYSTEM ####\n\nEnter 1 : To View details of all available Books\nEnter 2 : To check detail of a particular book\nEnter 3 : To lend a book \nEnter 4 : To add new books in list \nEnter 5 : To update data \nEnter 6 : To view details of borrowers \nEnter 7 : To commit all changes and exit')
    dec = input('\nenter your choice-')
    if dec == '1':
        all_data('books')
    elif dec=='2':
        tup=('SN','Book_Name','Quantity_Available','Price_Per_Day')
        tup1 = ('SN', 'borrowers_name', 'book_lent', 'contact_no')
        in1=str(input('enter first name , last name or middle name of a book-'))
        print('\n___ALL DATA OF BOOKS HAVING "{}" IN THEIR NAME FROM BOTH TABLE____'.format(in1))
        st =str('select * from books where book_name like "{}"'.format('%'+in1+'%'))
        st1=str('select * from borrower where book_lent like "{}"'.format('%'+in1+'%'))
        print('\n__DATA FROM TABLE BOOKS__\n')
        command(st)
        print(tup)
        fetch()
        print('\n__DATA FROM TABLE BORROWER__\n')
        command(st1)
        print(tup1)
        fetch()
        print()
    elif dec == '3':
        lend()
    elif dec=='4':
        insert()
    elif dec=='5':
        flag='true'
        while flag=='true':
            tname = 'books'
            li = []
            st1 = 'desc '+tname
            command(st1)
            data = cursor.fetchall()
            for i in data:
                li.append(i[0])
            all_data(tname)
            print('\n columns in table '+tname+' are')
            print(li)
            col1 = str(input('enter column name for modification from above list-'))
            lipo = ['SN']
            lipo.append(col1)
            print(tuple(lipo))
            st0 = 'select SN , %s from books' % (col1)
            command(st0)
            fetch()
            pre_value = str(input('enter corresponding SN for the data to be changed-'))
            post_value = str(input('enter new value for column %s having SN %s-' % (col1, pre_value)))
            update(tname, col1, post_value, pre_value)
            dec = str(input('Do you want to change more data?(Y/N)-'))
            if dec == 'y' or dec == 'Y':
                flag='true'            
            else:
                flag='false'
        
    elif dec=='6':
        borrowers()
    elif dec=='7':
        close()
    action_list()
action_list()

created 3 years ago by 20 Rohit Singh Xll'A' 2456A

MySQL online editor

Write, Run & Share MySQL queries online using OneCompiler's MySQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for MySQL. Getting started with the OneCompiler's MySQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'MySQL' and start writing queries to learn and test online without worrying about tedious process of installation.

About MySQL

MySQL is a open-source, free and very popular relational database management system which is developed, distributed and supported by Oracle corporation.

Key Features:

Open-source relational database management systems.
Reliable, very fast and easy to use database server.
Works on client-server model.
Highly Secure and Scalable
High Performance
High productivity as it uses stored procedures, triggers, views to write a highly productive code.
Supports large databases efficiently.
Supports many operating systems like Linux*,CentOS*, Solaris*,Ubuntu*,Windows*, MacOS*,FreeBSD* and others.

Syntax help

Commands

1. CREATE

CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

Example

CREATE TABLE EMPLOYEE (
  empId INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  dept TEXT NOT NULL
);

2. ALTER

ALTER TABLE Table_name ADD column_name datatype;

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Dave', 'Sales');

3. TRUNCATE

TRUNCATE table table_name;

4. DROP

DROP TABLE table_name;

5. RENAME

RENAME TABLE table_name1 to new_table_name1;

6. COMMENT

Single-Line Comments:

 --Line1;

Multi-Line comments:

   /* Line1,
   Line2 */

DML Commands

1. INSERT

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

Note: Column names are optional.

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Ava', 'Sales');

2. SELECT

SELECT column1, column2, ...
FROM table_name
[where condition];

Example

SELECT * FROM EMPLOYEE where dept ='sales';

3. UPDATE

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Example

UPDATE EMPLOYEE SET dept = 'Sales' WHERE empId='0001';

4. DELETE

DELETE FROM table_name where condition;

Example

DELETE from EMPLOYEE where empId='0001';

Indexes

1. CREATE INDEX

  CREATE INDEX index_name on table_name(column_name);

To Create Unique index:

  CREATE UNIQUE INDEX index_name on table_name(column_name);

2. DROP INDEX

DROP INDEX index_name ON table_name;

Views

1. Create a View

Creating a View:
CREATE VIEW View_name AS 
Query;

2. How to call view

SELECT * FROM View_name;

3. Altering a View

ALTER View View_name AS 
Query;

4. Deleting a View

DROP VIEW View_name;

Triggers

1. Create a Trigger

CREATE TRIGGER trigger_name trigger_time trigger_event
    ON tbl_name FOR EACH ROW [trigger_order] trigger_body
/* where
trigger_time: { BEFORE | AFTER }
trigger_event: { INSERT | UPDATE | DELETE }
trigger_order: { FOLLOWS | PRECEDES } */

2. Drop a Trigger

DROP TRIGGER [IF EXISTS] trigger_name;

Stored Procedures

1. Create a Stored Procedure

CREATE PROCEDURE sp_name(p1 datatype)
BEGIN
/*Stored procedure code*/
END;

2. How to call Stored procedure

CALL sp_name;

3. How to delete stored procedure

DROP PROCEDURE sp_name;

Joins

1. INNER JOIN

SELECT * FROM TABLE1 INNER JOIN TABLE2 where condition;

2. LEFT JOIN

SELECT * FROM TABLE1 LEFT JOIN TABLE2 ON condition;

3. RIGHT JOIN

SELECT * FROM TABLE1 RIGHT JOIN TABLE2 ON condition;

4. CROSS JOIN

SELECT select_list from TABLE1 CROSS JOIN TABLE2;