Added two files.

Author: dipanshisrivastava

Database_python_connection.py

@@ -0,0 +1,118 @@
+import sqlite3
+import os
+from sqlite3 import Error
+
+def create_connection(Education):
+	conn = None
+	try:
+		conn = sqlite3.connect(Education)
+	except Error as e:
+		print(e)
+
+	return conn
+
+# col_name
+def select_task(conn,table_name,col_name,where_clause):
+	cur = conn.cursor()
+	#new string
+	str_query = ""
+
+	str_query = str_query + "SELECT "
+	print("After adding select keyword ",str_query)
+
+	#string for all the relevent columns of the table:
+	str_column_list = ""
+	# SELECT Roll_Number,a,b,c FROM Student
+	for i in range(len(col_name)):
+		str_column_list = str_column_list + col_name[i]
+		print(str_column_list)
+		if i != len(col_name)-1:
+			str_column_list = str_column_list + ","
+
+	print( " Column Names are ",str_column_list)
+
+	str_query = str_query + str_column_list
+	print( " Now Query is ",str_query)
+
+	str_query = str_query + " FROM " + table_name + " "
+
+	print( " Now Query is ",str_query)
+
+	if where_clause != "":
+		str_query = str_query + " WHERE " + where_clause
+
+	print( " Now Query is ",str_query)
+	cur.execute(str_query)
+	rows = cur.fetchall()
+	for row in rows:
+		print(row)
+
+def delete_task(conn,table_name,where_clause):
+	cur = conn.cursor()
+	#DELETE FROM Student where Subject_ID=2
+	str_query = ""
+	if where_clause != "":
+		str_query = str_query + "DELETE FROM " + table_name + " WHERE "+ where_clause
+	else:
+		str_query = str_query + "DELETE FROM " + table_name
+
+	str_query="Select * FROM "+table_name
+	print( " Now Delete Query is ",str_query)
+
+	cur.execute(str_query)
+
+	rows = cur.fetchall()
+
+	for row in rows:
+		print(row)
+
+# update tb set c1 = c1_val , c2 = c2_val WHERE c_name = c_name_value
+def update_task(conn,table_name,col_name,data,where_clause):
+	cur = conn.cursor()
+	str_query = ""
+	str_query = str_query + "update "+ table_name+ " set "
+
+	for i in range(len(col_name)):
+		str_query = str_query + col_name[i] + " = '"+ data[i] + "'"
+		if i != len(col_name)-1:
+			str_query = str_query + ","
+
+	if where_clause != "":
+		str_query = str_query + " WHERE "+ where_clause
+#str = "update Subject set branch='computer science' where subject_id = 3"
+	print( " Now Update Query is ",str_query)
+
+	cur.execute(str_query)
+
+	rows = cur.fetchall()
+
+	for row in rows:
+		print(row)
+
+	
+
+def main():
+	database = r"Education.db"
+	print("Current Path : ",os.getcwd())
+	conn = create_connection(database)
+	with conn:
+		print("1. Query task")
+
+		col_name = ['Roll_Number','Name']
+		#select_task(conn,'Student',col_name,"Name='Ram'")
+		select_task(conn,'Student',col_name,"")
+
+		#col_name = ['Branch','Subject_Name']
+		delete_task(conn,'Subject',"Subject_ID=4")
+
+		col_name = ['Name','Address','Id_Proof']
+		data_send = ['Astha','Gorakhpur','PAN']
+		update_task(conn,'Student',col_name,data_send,"Roll_Number=3")
+
+		col_name = ['Name','Roll_Number','Address','Phone_Number','Id_Proof']
+		#select_task(conn,'Student',col_name,"Name='Ram'")
+		select_task(conn,'Student',col_name,"")
+
+
+if __name__ == '__main__':
+	main()