|
| 1 | +import sqlite3 |
| 2 | +import sys |
| 3 | +import csv |
| 4 | + |
| 5 | +db_conn = sqlite3.connect('test.db') |
| 6 | +print("Database Created") |
| 7 | +the_cursor = db_conn.cursor() |
| 8 | + |
| 9 | +the_cursor.execute("DROP TABLE employees;") |
| 10 | + |
| 11 | + |
| 12 | +def print_db(): |
| 13 | + try: |
| 14 | + result = the_cursor.execute("SELECT id, f_name, l_name, age, address, salary, hire_date " |
| 15 | + "FROM employees") |
| 16 | + for row in result: |
| 17 | + print("id:", row[0]) |
| 18 | + print("f_name:", row[1]) |
| 19 | + print("l_name:", row[2]) |
| 20 | + print("age:", row[3]) |
| 21 | + print("address:", row[4]) |
| 22 | + print("salary:", row[5]) |
| 23 | + print("hire_date:", row[6]) |
| 24 | + except sqlite3.OperationalError: |
| 25 | + print("The table doesn't exist") |
| 26 | + except: |
| 27 | + print("Couldn't retrieve data from database") |
| 28 | + |
| 29 | + |
| 30 | +try: |
| 31 | + db_conn.execute("CREATE TABLE employees(" |
| 32 | + "id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, " |
| 33 | + "f_name TEXT NOT NULL," |
| 34 | + "l_name TEXT NOT NULL, " |
| 35 | + "age INT NOT NULL, " |
| 36 | + "address TEXT, " |
| 37 | + "salary REAL, " |
| 38 | + "hire_date TEXT);") |
| 39 | + db_conn.commit() |
| 40 | + print("Table Created") |
| 41 | +except sqlite3.OperationalError as e: |
| 42 | + print("Table couldn't be created:", str(e)) |
| 43 | + |
| 44 | +db_conn.execute("INSERT INTO employees(f_name, l_name, age, address, salary, hire_date) VALUES('Derek', 'Banas', '43', " |
| 45 | + "'123 Main St', '500000', date('now'));") |
| 46 | +db_conn.commit() |
| 47 | +print("Employee Entered") |
| 48 | + |
| 49 | +print_db() |
| 50 | + |
| 51 | +try: |
| 52 | + db_conn.execute("UPDATE employees SET address = '121 Main St'" |
| 53 | + "WHERE ID = 1") |
| 54 | + db_conn.commit() |
| 55 | +except sqlite3.OperationalError: |
| 56 | + print("Database couldn't be updated") |
| 57 | + |
| 58 | +print_db() |
| 59 | + |
| 60 | +try: |
| 61 | + db_conn.execute("DELETE FROM employees" |
| 62 | + "WHERE id = 1") |
| 63 | + db_conn.commit() |
| 64 | +except sqlite3.OperationalError: |
| 65 | + print("Data couldn't be deleted") |
| 66 | + |
| 67 | +print_db() |
| 68 | + |
| 69 | +db_conn.rollback() |
| 70 | + |
| 71 | +print_db() |
| 72 | + |
| 73 | +try: |
| 74 | + db_conn.execute("ALTER TABLE employees" |
| 75 | + "ADD COLUMN 'image' BLOB DEFAULT NULL") |
| 76 | + db_conn.commit() |
| 77 | +except sqlite3.OperationalError: |
| 78 | + print("Table couldn't be altered") |
| 79 | + |
| 80 | +the_cursor.execute("PRAGMA TABLE_INFO(employees)") |
| 81 | +row_names = [nameTuple[1] for nameTuple in the_cursor.fetchall()] |
| 82 | +print(row_names) |
| 83 | + |
| 84 | +the_cursor.execute('SELECT COUNT(*)' |
| 85 | + 'FROM employees') |
| 86 | +num_of_rows = the_cursor.fetchall() |
| 87 | +print("Total Rows:", num_of_rows[0][0]) |
| 88 | + |
| 89 | +the_cursor.execute("SELECT SQLITE_VERSION()") |
| 90 | +print("SQLITE VERSION:", the_cursor.fetchone()) |
| 91 | + |
| 92 | +with db_conn: |
| 93 | + db_conn.row_factory = sqlite3.Row |
| 94 | + the_cursor = db_conn.cursor() |
| 95 | + the_cursor.execute("SELECT * FROM employees") |
| 96 | + rows = the_cursor.fetchall() |
| 97 | + for row in rows: |
| 98 | + print("{} {}".format(row["f_name"], row["l_name"])) |
| 99 | + |
| 100 | +with open('dumpl.sql', 'w') as f: |
| 101 | + for line in db_conn.iterdump(): |
| 102 | + f.write("%s\n" % line) |
| 103 | + |
| 104 | +db_conn.close() |
0 commit comments