封装的Sqlite3简易操作

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import sqlite3
con=''
cur=''
def connect(host):
	global con
	global cur
	try:
		con=sqlite3.connect(host)
		cur=con.cursor()
		return True
	except:
		print('数据库连接失败!')
		return False
def update(table,cname,cvalue,name,value,commit=True):
	global con
	sql='update '+table+' set '+name+"='"+value+"' where "+cname+"='"+cvalue+"'"
	try:
		query(sql)
		if commit==True:
			con.commit()
		return True
	except:
		return False
def create(table,main=False,commit=True):
	global con
	global cur
	sql='create table '+table +'('
	if main!=False:
		sql+=main+' INTEGER PRIMARY KEY AUTOINCREMENT,'
	name=[]
	type=[]
	for n in value.keys():
		name.append(n)
	for n in value.values():
		type.append(n)
	i=0
	while i<len(value):
		if i ==len(value)-1:
			sql+=name[i]+' '+type[i].upper()+')'
		else:
			sql+=name[i]+' '+type[i].upper()+','
		i+=1
	try:
		query(sql)
		if commit==True:
			con.commit()
		return True
	except:
		return False
def insert(table,commit=True):
	global con
	sql='insert into '+table+'('
	i=0
	for n in value.keys():
		i=i+1
		if i!=len(value):
			sql=sql+n+','
		else:
			sql=sql+n+')values('
	i=0
	for n in value.values():
		i=i+1
		if i!=len(value):
			sql=sql+"'"+n+"'"+','
		else:
			sql=sql+"'"+n+"'"+')'
	try:
		query(sql)
		if commit==True:
			con.commit()
		return True
	except:
		return False
def select(table,vname,vvalue):
	global cur
	sql='select '+name+' from '+table+' where '+vname+"='"+vvalue+"'"
	try:
		query(sql)
	except:
		return None
	try:
		re=cur.fetchall()
		return str(re[0][0])
	except:
		return None
def query(sql):
	global cur
	return cur.execute(sql)
def delete(table,vvalue,commit=True):
	global con
	sql='DELETE  FROM  '+table+' WHERE  '+vname+"='"+vvalue+"'"
	try:
		query(sql)
		if commit==True:
			con.commit()
		return True
	except:
		return False
def drop(table):
	sql='DROP TABLE  '+table
	try:
		query(sql)
		return True
	except:
		return False
def close():
	global con
	global cur
	cur.close()
	con.commit()
	con.close()

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