From 6218f36efdb892096a8952507f6d304ac11c08e7 Mon Sep 17 00:00:00 2001
From: ChillerDragon <ChillerDragon@gmail.com>
Date: Fri, 5 Oct 2018 22:46:16 +0200
Subject: [PATCH 1/3] Add sql sample

---
 sql.py | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100755 sql.py

diff --git a/sql.py b/sql.py
new file mode 100755
index 0000000..b037a2f
--- /dev/null
+++ b/sql.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# SAMPLE SQL FILE
+# Will create a file in the current directory 'blockchain.db'
+
+import sqlite3 as lite
+
+create_table = """
+CREATE TABLE IF NOT EXISTS Blockchain (
+    ID              INTEGER PRIMARY KEY AUTOINCREMENT,
+    PubKey          TEXT,
+    Coins           INTEGER
+);
+"""
+
+def CreateDataBase():
+  con = lite.connect("blockchain.db")
+  c = con.cursor()
+  c.execute(create_table)
+  print("Table Blockchain created.")
+
+def DeleteDataBase():
+  con = lite.connect("blockchain.db")
+  with con:
+    c = con.cursor()
+    c.execute("DROP TABLE IF EXISTS Blockchain;")
+    print("Table Blockchain deleted.")
+
+def AddPubKey(key, coins):
+  con = lite.connect("blockchain.db")
+  with con:
+    c = con.cursor()
+    c.execute("INSERT INTO Blockchain (PubKey, Coins) VALUES (?, ?);", (key, coins))
+
+def PrintPubKeys():
+  con = lite.connect("blockchain.db")
+  with con:
+    c = con.cursor()
+    c.execute("SELECT * FROM Blockchain;")
+    row = c.fetchall()
+    print(str(row))
+
+CreateDataBase()
+AddPubKey("91298e9812eh81298he9h182e", 420)
+PrintPubKeys()
+
+DeleteDataBase()

From c7f48ac68115e8b695f6b9ccb1c8f45b6b014d27 Mon Sep 17 00:00:00 2001
From: ChillerDragon <ChillerDragon@gmail.com>
Date: Fri, 5 Oct 2018 23:13:31 +0200
Subject: [PATCH 2/3] Check if the key is in the database

---
 sql.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sql.py b/sql.py
index b037a2f..a9dd19a 100755
--- a/sql.py
+++ b/sql.py
@@ -39,8 +39,20 @@ def PrintPubKeys():
     row = c.fetchall()
     print(str(row))
 
+def GetCoinsByKey(key):
+  con = lite.connect("blockchain.db")
+  with con:
+    c = con.cursor()
+    c.execute("SELECT * FROM Blockchain WHERE PubKey = '{k}';".format(k=key))
+    row = c.fetchall()
+    if not row:
+      return None
+    return row[0][2] # return the amount of coins
+
 CreateDataBase()
 AddPubKey("91298e9812eh81298he9h182e", 420)
 PrintPubKeys()
+print(GetCoinsByKey("91298e9812eh81298he9h182e")) # => 420
+print(GetCoinsByKey("invalid_key"))               # => None
 
 DeleteDataBase()

From 14cb554ee930f91a7ef52ba7c568eebbb9e5fe49 Mon Sep 17 00:00:00 2001
From: ChillerDragon <ChillerDragon@gmail.com>
Date: Fri, 5 Oct 2018 23:14:02 +0200
Subject: [PATCH 3/3] Ignore database files

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..98e6ef6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.db