Python operation mysql database to achieve the function of adding deleting checking and changing
- 2020-06-23 01:08:11
- OfStack
An example of Python operation mysql database to implement the function of adding, deleting, checking and changing. To share for your reference, specific as follows:
#coding=utf-8
import MySQLdb
class Mysql_Oper:
def __init__(self,host,user,passwd,db):
self.host=host
self.user=user
self.passwd=passwd
self.database=db
def db_connecet(self):
try:
# The connection
conn=MySQLdb.connect(host=self.host,user=self.user,passwd=self.passwd,db=self.database,charset="utf8")
cursor = conn.cursor()
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def drop_table(self,table):
try:
# Delete table
sql = "drop table if exists" + table
cursor.execute(sql)
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def create_table(self,table):
try:
if table=="dept":
# create
sql = "create table if not exists dept(deptno int primary key, dname varchar(50),loc varchar(50))"
cursor.execute(sql)
elif table=="emp":
sql == "create table if not exists emp(empno INT PRIMARY KEY,ename VARCHAR(50),job VARCHAR(50),mgr INT,hiredate DATE,sal DECIMAL(7,2),COMM DECIMAL(7,2),deptno INT,loc varchar(50),CONSTRAINT fk_emp FOREIGN KEY(mgr) REFERENCES emp(empno))"
cursor.execute(sql)
elif table=="salgrade":
sql = "create table if not exists salgrade(grade INT PRIMARY KEY,losal INT,hisal INT)"
cursor.execute(sql)
elif table=="stu":
# create
sql = "create table if not exists dept(sid INT PRIMARY KEY,sname VARCHAR(50),age INT,gander VARCHAR(10),province VARCHAR(50),tuition INT)"
cursor.execute(sql)
else:
print u" Incorrect table name entered, indicating as dept , emp , salgrade , stu..."
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def inser_onedata_table(self,table):
try:
if table=="dept":
sql = "insert into dept values(%s,%s,%s)"
param = (40, 'cai wu bu', 'wu han')
n = cursor.execute(sql,param)
print 'insert',n
elif table=="emp":
sql = "insert into emp values(%s,%s,%s,%s,%s,%s,%s,%s)"
param = (1009, 'a niu', 'dong shi zhang', NULL, '2001-11-17', 50000, NULL, 10)
n = cursor.execute(sql,param)
print 'insert',n
elif table=="salgrade":
sql = "insert into salgrade values(%s,%s,%s)"
param = (1, 7000, 12000)
n = cursor.execute(sql,param)
print 'insert',n
elif table=="stu":
sql = "insert into stu values(%s,%s,%s,%s,%s,%s)"
param = ('1', '001', '23', 'nan', 'bei jing', '1500')
n = cursor.execute(sql,param)
print 'insert',n
else:
print u" Incorrect table name entered, indicating as dept , emp , salgrade , stu..."
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def inser_muldata_table(self,table):
try:
if table=="dept":
sql = "insert into dept values(%s,%s,%s)"
param = ((10, 'jiao yan bu', 'bei jing'),(20, 'xue gong bu', 'shang hai'),(30, 'xiao shou bu', 'guang zhou'))
n = cursor.executemany(sql,param)
print 'insert',n
elif table=="emp":
sql = "insert into emp values(%s,%s,%s,%s,%s,%s,%s,%s)"
param = ((1004, 'liu bei', 'jing li', 1009, '2001-04-02', 29750, NULL, 20),
(1006, 'guan yu', 'jing li', 1009, '2001-05-01', 28500, NULL, 30),
(1008, 'zhu ge liang', 'fen xi shi', 1004, '2007-04-19', 30000, NULL, 20),
(1013, 'pang', 'fen xi shi', 1004, '2001-12-03', 30000, NULL, 20),
(1002, 'dai', 'xiao shou yuan', 1006, '2001-02-20', 16000, 3000, 30),
(1003, 'tian zheng', 'xiao shou yuan', 1006, '2001-02-22', 12500, 5000, 30),
(1005, 'xie xun', 'xiao shou yuan', 1006, '2001-09-28', 12500, 14000, 30),
(1010, 'wei yi xiao', 'xiao shou yuan', 1006, '2001-09-08', 15000, 0, 30)
)
n = cursor.executemany(sql,param)
print 'insert',n
elif table=="salgrade":
sql = "insert into salgrade values(%s,%s,%s)"
param = ((2, 12010, 14000),(3, 14010, 20000),(4, 20010, 30000),(5, 30010, 99990))
n = cursor.executemany(sql,param)
print 'insert',n
elif table=="stu":
sql = "insert into stu values(%s,%s,%s,%s,%s,%s)"
param = ( ('2', '002', '25', 'nan', 'liao ning', '2500'),
('3', '003', '22', 'nan', 'bei jing', '3500'),
('4', '004', '25', 'nan', 'bei jing', '1500'),
('5', '005', '23', 'nv', 'bei jing', '1000'),
('6', '006', '22', 'nv', 'shan dong', '2500'),
('7', '007', '21', 'nv', 'bei jing', '1600'),
('8', '008', '23', 'nan', 'bei jing', '3500'),
('9', '009', '23', 'nv', 'guang zhou', '2500'),
('10', '010', '18', 'nan', 'shan xi', '3500'),
('11', '011', '23', 'nan', 'hu bei', '4500'),
('12', '011', '24', 'nan', 'bei jing', '1500'),
('13', '011', '24', 'nan', 'liao ning', '2500'),
('14', '011', '22', 'nan', 'bei jing', '3500'),
('15', '011', '25', 'nan', 'bei jing', '1500'),
('16', '011', '23', 'nv', 'bei jing', '1000'),
('17', '011', '22', 'nv', 'shan dong', '2500'),
('18', '011', '21', 'nv', 'bei jing', '1600'),
('19', '011', '23', 'nan', 'bei jing', '3500'),
('20', '011', '23', 'nv', 'guang zhou', '2500'),
('21', '011', '18', 'nan', 'shan xi', '3500'),
('22', '011', '23', 'nan', 'hu bei', '4500'),
('23', '011', '23', 'nan', 'bei jing', '1500'),
('24', '011', '25', 'nan', 'liao ning', '2500'),
('25', '011', '22', 'nan', 'bei jing', '3500'),
('26', '011', '25', 'nan', 'bei jing', '1500'),
('27', '011', '23', 'nv', 'bei jing', '1000'),
('28', '011', '22', 'nv', 'shan dong', '2500'),
('29', '011', '21', 'nv', 'bei jing', '1600'),
('30', '011', '23', 'nan', 'bei jing', '3500'),
('31', '011', '23', 'nv', 'guang zhou', '2500'),
('32', '011', '18', 'nan', 'shan xi', '3500'),
('33', '033', '23', 'nan', 'hu bei', '4500'),
('34', '034', '23', 'nan', 'bei jing', '1500'),
('35', '035', '25', 'nan', 'liao ning', '2500'),
('36', '036', '22', 'nan', 'bei jing', '3500'),
('37', '037', '25', 'nan', 'bei jing', '1500'),
('38', '038', '23', 'nv', 'bei jing', '1000'),
('39', '039', '22', 'nv', 'shan dong', '2500'),
('40', '040', '21', 'nv', 'bei jing', '1600'),
('41', '041', '23', 'nan', 'bei jing', '3500'),
('42', '042', '23', 'nv', 'guang zhou', '2500'),
('43', '043', '18', 'nan', 'shan xi', '3500'),
('44', '044', '23', 'nan', 'hu bei', '4500'),
('45', '045', '23', 'nan', 'bei jing', '1500'),
('46', '046', '25', 'nan', 'liao ning', '2500'),
('47', '047', '22', 'nan', 'bei jing', '3500'),
('48', '048', '25', 'nan', 'bei jing', '1500'),
('49', '049', '23', 'nv', 'bei jing', '1000'),
('50', '050', '22', 'nv', 'shan dong', '2500'),
('51', '051', '21', 'nv', 'bei jing', '1600'),
('52', '052', '23', 'nan', 'bei jing', '3500'),
('53', '053', '23', 'nv', 'guang zhou', '2500'),
('54', '054', '18', 'nan', 'shan xi', '3500'),
('55', '055', '23', 'nan', 'hu bei', '4500')
)
n = cursor.executemany(sql,param)
print 'insert',n
else:
print u" Incorrect table name entered, indicating as dept , emp , salgrade , stu..."
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def update_table(self,table,no,upno):
try:
if table=="dept":
# create
sql = "update dept set deptno=%s where deptno=" +no
param = (upno)
n = cursor.execute(sql,param)
print 'update',n
elif table=="emp":
sql = "update emp set empno=%s where empno=" +no
param = (upno)
n = cursor.execute(sql,param)
print 'update',n
elif table=="salgrade":
sql = "update salgrade set grade=%s where grade=" +no
param = (upno)
n = cursor.execute(sql,param)
print 'update',n
elif table=="stu":
sql = "update stu set sname=%s where sname=" +no
param = (upno)
n = cursor.execute(sql,param)
print 'update',n
else:
print u" Incorrect table name entered, indicating as dept , emp , salgrade , stu..."
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def query_data(self,table):
try:
# The query
sql="select * from "+table
n = cursor.execute(sql)
print cursor.fetchall()
for row in cursor.fetchall():
print row
for r in row:
print r
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
def delete_data(self,table,no)
try:
if table=="dept":
sql = "delete from dept where deptno=%s"
param = (upno)
n = cursor.execute(sql,param)
print 'delete',n
elif table=="emp":
sql = "delete from emp where empno=%s"
param = (upno)
n = cursor.execute(sql,param)
print 'delete',n
elif table=="salgrade":
sql = "delete from salgrade where grade=%s"
param = (upno)
n = cursor.execute(sql,param)
print 'delete',n
elif table=="stu":
sql = "delete from stu where sname=%s "
param = (upno)
n = cursor.execute(sql,param)
print 'delete',n
else:
print u" Incorrect table name entered, indicating as dept , emp , salgrade , stu..."
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
del down_db(self):
try:
cursor.close()
# submit
conn.commit()
# Shut down
conn.close()
except MySQLdb.Error,e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
mysqlDB=Mysql_Oper("127.0.0.1","root","root","exam")
mysqlDB.db_connecet()
mysqlDB.drop_table("dept")
for table in ["dept","emp","salgrade","stu"]
mysqlDB.create_table(table)
mysqlDB.inser_onedata_table(table)
mysqlDB.inser_muldata_table(table)
mysqlDB.query_data(table)
mysqlDB.down_db()
I'm going to put the data into the CSV file later, and I'm going to manipulate the CSV file to manipulate the data
More about Python related topics: interested readers to view this site "Python + MySQL database programming tutorial", "common database operations Python skills summary", "Python mathematical operation skills summary", "Python data structure and algorithm tutorial", "Python function using techniques", "Python string skills summary", "Python introduction and advanced tutorial" and "Python file and directory skills summary"
I hope this article has been helpful in Python programming.