Autosave: 2024-11-07 08:09:40

neuron/558c0727-0f83-47d2-a06f-ebf6f98e8821/Using_SQLite_with_Python.md

@@ -0,0 +1,85 @@
+---
+tags: [python, databases, SQL]
+created: Thursday, November 07, 2024
+---
+
+# Using SQLite with Python
+
+SQLite is part of the core library, you do not require a separate package
+
+```py
+import sqlite3
+```
+
+## Connect to database
+
+Connect to an existing SQLite `.db` file or create a new database with the same
+command:
+
+```py
+connection = sqlite3.connect("my_database.db")
+```
+
+## Disconnect from database
+
+```python
+connection.close()
+```
+
+## Querying
+
+`connect` exposes a `cursor` entity. This is used for executing changes against
+the database file.
+
+### Example: creating a table
+
+```python
+CREATE_TAGS_TABLE = """
+CREATE TABLE IF NOT EXISTS tags (
+    name TEXT PRIMARY KEY
+)
+"""
+
+cursor = connection.cursor()
+cursor.execute(CREATE_TAGS_TABLE)
+cursor.commit()
+
+# Confirm changes
+
+cursor.execute("SELECT name from sqlite_master WHERE type='table'")
+print(cursor.fetchall())
+# (tags)
+```
+
+## Prepared statements and parameterised queries
+
+### Parameterised queries
+
+```py
+username = "thomas"
+password = "123"
+cursor.execute("SELECT * FROM users WHERE username = ? AND password = ?",
+            (username, password))
+```
+
+Alternatively, pass the [tuple](Tuples_in_Python.md) directly:
+
+```python
+login_data = ("thomas", "123")
+cursor.execute("SELECT * FROM users WHERE username = ? AND password = ?",
+               login_data)
+
+```
+
+### Prepared statements
+
+> With prepared statements you have to use a dictionary not a dictionary or
+> other data type
+
+```python
+user_data = {
+    "username": "thomas",
+    "email": "thomas@email.com"
+}
+
+```

neuron/558c0727-0f83-47d2-a06f-ebf6f98e8821/index.md

@@ -13,12 +13,13 @@ computer science.
 
 ![not-by-ai-badge](static/not-by-ai-alternative--light.svg)
  
-**Build ID:** 1b27e703-342c-4cda-a280-3c6903424ecd
+**Build ID:** 558c0727-0f83-47d2-a06f-ebf6f98e8821
 
-**Published:** Tue 05 Nov 2024 15:14:03
+**Published:** Thu 07 Nov 2024 08:09:39
 
 ### Recent edits 
 
+- [[Using_SQLite_with_Python]] 
 - [[f6564af9_AOL_and_early_internet_enclosure]] 
 - [[241fe1a3_the_Web_versus_modem_BBSs]] 
 - [[Weaving_the_Web_Berners_Lee]] 
@@ -30,10 +31,9 @@ computer science.
 - [[MongoDB_connection]] 
 - [[Commutative_Property_of_Addition_and_Multiplication]] 
 - [[Call_stack]] 
-- [[Typing_built_in_React_hooks]] 
 
 
-### All notes (486) 
+### All notes (487) 
 
 - [[241fe1a3_the_Web_versus_modem_BBSs]] 
 - [[385af4b4_Baran_distributed_networks]] 
@@ -475,6 +475,7 @@ computer science.
 - [[User_management_in_Linux]] 
 - [[User_management_on_AWS]] 
 - [[Using_GraphQL_with_Node]] 
+- [[Using_SQLite_with_Python]] 
 - [[Using_arguments_with_Apollo_Client]] 
 - [[Utilities_operators_flags]] 
 - [[Validating_Mongoose_schemas]] 

zk/Using_SQLite_with_Python.md

@@ -0,0 +1,85 @@
+---
+tags: [python, databases, SQL]
+created: Thursday, November 07, 2024
+---
+
+# Using SQLite with Python
+
+SQLite is part of the core library, you do not require a separate package
+
+```py
+import sqlite3
+```
+
+## Connect to database
+
+Connect to an existing SQLite `.db` file or create a new database with the same
+command:
+
+```py
+connection = sqlite3.connect("my_database.db")
+```
+
+## Disconnect from database
+
+```python
+connection.close()
+```
+
+## Querying
+
+`connect` exposes a `cursor` entity. This is used for executing changes against
+the database file.
+
+### Example: creating a table
+
+```python
+CREATE_TAGS_TABLE = """
+CREATE TABLE IF NOT EXISTS tags (
+    name TEXT PRIMARY KEY
+)
+"""
+
+cursor = connection.cursor()
+cursor.execute(CREATE_TAGS_TABLE)
+cursor.commit()
+
+# Confirm changes
+
+cursor.execute("SELECT name from sqlite_master WHERE type='table'")
+print(cursor.fetchall())
+# (tags)
+```
+
+## Prepared statements and parameterised queries
+
+### Parameterised queries
+
+```py
+username = "thomas"
+password = "123"
+cursor.execute("SELECT * FROM users WHERE username = ? AND password = ?",
+            (username, password))
+```
+
+Alternatively, pass the [tuple](Tuples_in_Python.md) directly:
+
+```python
+login_data = ("thomas", "123")
+cursor.execute("SELECT * FROM users WHERE username = ? AND password = ?",
+               login_data)
+
+```
+
+### Prepared statements
+
+> With prepared statements you have to use a dictionary not a dictionary or
+> other data type
+
+```python
+user_data = {
+    "username": "thomas",
+    "email": "thomas@email.com"
+}
+
+```