1 files changed, 107 insertions, 0 deletions
diff --git a/database_creation_script.py b/database_creation_script.py
new file mode 100644
index 0000000..bfc2ae5
--- /dev/null
+++ b/database_creation_script.py
@@ -0,0 +1,107 @@
+# Running this script automatically creates the database and normalizes the data.
+# This is same as running the 'dbcreation.ipynb' notebook step by step.
+# However their are some visualizations in the notebook but this script does not.
+# This script is intentended to automate the whole process in a single script.
+# This should run faster than the notebook.
+
+import pandas as pd
+import sqlite3
+from sqlite3 import Error
+import os
+
+def create_connection(db_file, delete_db=False):
+    
+    if delete_db and os.path.exists(db_file):
+        os.remove(db_file)
+
+    conn = None
+    try:
+        conn = sqlite3.connect(db_file)
+        conn.execute("PRAGMA foreign_keys = 1")
+    except Error as e:
+        print(e)
+
+    return conn
+
+def create_table(conn, create_table_sql):
+    try:
+        c = conn.cursor()
+        c.execute(create_table_sql)
+    except Error as e:
+        print(e)
+
+def execute_sql_statement(sql_statement, conn):
+    cur = conn.cursor()
+    cur.execute(sql_statement)
+
+    rows = cur.fetchall()
+
+    return rows
+
+df=pd.read_csv("GlobalLandTemperaturesByCity.csv")
+data=df[df.dt>"1949-12-31"]
+data_for_loc_table=data[['City','Latitude','Longitude']]
+data_for_loc_table=data_for_loc_table.to_records(index=False)
+result_data_for_loc_table=list(data_for_loc_table)
+records=data.to_records(index=False)
+result=list(records)
+req_resut=[]
+for i in result:
+    req_resut.append((i[4],))
+req_resut=list((set(req_resut)))
+conn = create_connection('database.db')
+cur=conn.cursor()
+execute_sql_statement("DROP TABLE IF EXISTS City_Table",conn)
+execute_sql_statement("DROP TABLE IF EXISTS Country_Table",conn)
+create_table(conn,'''CREATE TABLE Country_Table (PK INTEGER  PRIMARY KEY, Country_Name VARCHAR)''')
+cur.executemany("INSERT INTO Country_Table ('Country_Name') Values (?)",req_resut)
+abc=execute_sql_statement("Select * from Country_Table", conn)
+abc1={}
+for i in abc:
+    abc1[i[1]]=i[0]
+req_result_2=[]
+for i in result:
+    req_result_2.append((i[3],abc1[i[4]]))
+create_table(conn,'''CREATE TABLE City_Table (City_Id INTEGER  PRIMARY KEY, City_Name VARCHAR , Country_ID INTEGER,
+FOREIGN KEY(Country_ID) REFERENCES Country_Table(PK))''')
+city=[]
+for i in result:
+    city.append((i[3],abc1[i[4]]))
+city_country_unique=list((set(city)))
+cur.executemany("INSERT INTO City_Table ('City_Name','Country_ID') Values (?,?)",city_country_unique)
+city_index=execute_sql_statement("Select * from City_Table", conn)
+city_indexes={}
+for i in abc:
+    abc1[i[1]]=i[0]
+city_table_values=execute_sql_statement("select * from City_Table ",conn)
+city_ids={}
+for i in city_table_values:
+    city_ids[i[1]]=i[0]
+create_table(conn,'''CREATE TABLE Temperature (PK INTEGER  PRIMARY KEY , Date VARCHAR, Avg_Temperature VARCHAR, City_ID INTEGER,
+FOREIGN KEY(City_ID) REFERENCES City_Table(City_Id))''')
+temp_table_values=[]
+j=1
+for i in result:
+    j=j+1
+    temp_table_values.append((i[0],i[1],city_ids[i[3]]))
+cur.executemany("INSERT INTO Temperature ('Date','Avg_Temperature','City_ID') Values (?,?,?)",temp_table_values)
+create_table(conn,'''CREATE TABLE Loc_Table (ID INTEGER  PRIMARY KEY , City_ID INTEGER, LAT FLOAT,LONG FLOAT,
+FOREIGN KEY(City_ID) REFERENCES City_Table(City_ID))''')
+data_to_check_loc=result_data_for_loc_table
+data_to_input_loc_table=[]
+j=0
+for i in data_to_check_loc:
+    t=[0,0,0]
+    if i[1][-1]=='N':
+         t[1]=(float(i[1][:-1]))
+    if i[1][-1]=='S':
+         t[1]=float(i[1][:-1])*(-1)
+    if i[2][-1]=='E':
+         t[2]=float(i[2][:-1])  
+    if i[2][-1]=='W':
+         t[2]=float(i[2][:-1])*(-1)
+    t[0]=i[0]
+    tuple1=(city_ids[t[0]],t[1],t[2])
+    data_to_input_loc_table.append(tuple1)
+cur.executemany("INSERT INTO Loc_Table ('City_ID','LAT','LONG') Values (?,?,?)",data_to_input_loc_table)
+conn.commit()