Classes and Tables

The algorithm allows us to transfer data from an table to an object or vice versa.

Database_Programming.py/sqlite.py

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+#       Connecting to SQLite
+
+import sqlite3
+
+# This command creates a new database on your disk.
+conn = sqlite3.connect('mydata.db')
+
+# To execute statements:
+c = conn.cursor()
+
+# Now we can create our first table:
+c.execute("""CREATE TABLE persons (
+    first_name TEXT,
+    last_name TEXT,
+    age INTEGER
+    )""")
+
+#  Committing to our connection:
+conn.commit()
+
+# Closing the connection:
+conn.close()
+

Database_Programming.py/sqlite1.py

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+#        Inserting values
+
+import sqlite3
+
+conn = sqlite3.connect('mydata.db')
+c = conn.cursor()
+
+# These are the 3 values that are being inserting on our table:
+c.execute("""INSERT INTO persons VALUES
+    ('John', 'Smith', 25),
+    ('Anna', 'Smith', 30),
+    ('Mike', 'Johnson', 40)""")
+
+conn.commit()
+
+conn.close()

Database_Programming.py/sqlite2.py

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+#       Selecting values
+import sqlite3
+
+conn = sqlite3.connect('mydata.db')
+c = conn.cursor()
+
+c.execute("""SELECT * FROM persons;""")
+
+# We use fetchall() method in order to get our results:
+persons = c.fetchall()
+for d in range(0, len(persons)):
+    print(persons[d])
+
+conn.commit()
+conn.close()
+
+

Database_Programming.py/sqlite3.py

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+import sqlite3
+
+#       Classes and tables
+
+class Person():
+    def __init__(self, first=None,
+        last=None, age=None):
+        self.first = first
+        self.last = last
+        self.age = age
+
+    def clone_person(self, result):
+        self.first = result[0]
+        self.last = result[1]
+        self.age = result[2]
+
+
+#       From table to object
+
+conn = sqlite3.connect('mydata.db')
+c = conn.cursor()
+
+c.execute("""SELECT * FROM persons
+    WHERE last_name = 'Smith'""")
+
+person1 = Person()
+person1.clone_person(c.fetchone())
+
+print(person1.first)
+print(person1.last)
+print(person1.age)
+
+#       From object to table
+
+person2 = Person("Bob", "Davis", 23)
+c.execute(f"""INSERT INTO persons VALUES
+    ('{person2.first}', '{person2.last}', '{person2.age}')""")
+
+conn.commit()
+conn.close()
+