CSCI-UA: Database Design & Web Implementation. Professor Evan Sandhaus Lecture #23: SQLite

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1 CSCI-UA: Database Design & Web Implementation Professor Evan Sandhaus Lecture #23: SQLite Database Design and Web Implementation

2 Administrivia! Homework HW 8 Is Out! Do Some Reading Check out sqlite website: Database Design and Web Implementation 3

3 On The Menu! Homework Questions PHP, MySQL, HTML, CSS! SQLite Introduction Professor Example Database Design and Web Implementation 4

4 MySQL Architecture (Simplified) Appplication Network Connection MySQL Server Database Design and Web Implementation 5

5 SQLite Architecture Simplified Appplication Local I/O File System SQLite Library Database Design and Web Implementation 6

6 SQLite The Vitals! Released in The Year 2000! Features Serverless Zero Configuration Cross-Platform Self-Contained Small Footprint Database Design and Web Implementation 7

7 Installation OSX open terminal cd /tmp wget unzip sqlite-shell-osx-x zip sudo cp sqlite-shell-osx-x zip /usr/local/ bin/ Database Design and Web Implementation 8

8 SQLite's Typing System! SQLite Supports columns of the following types: Text Integer Float Numeric None Database Design and Web Implementation 9

9 Defining Column Types CREATE TABLE t1... INTEGER: c_name type where type contains the substring 'int' FLOAT: c_name type where type contains the substring 'REAL', 'FLOA' or 'DOUB' TEXT: c_name type where type contains the substring 'CHAR', 'CBLOB', 'TEXT' NONE: c_name type where type is not specified or contains 'BLOB' NUMERIC: c_type type where none of the above rules match Database Design and Web Implementation 10

10 SQLite's Typing System Database Design and Web Implementation 11

11 SQLite's Typing System! SQLite Don't give a... You can specify types but SQLite doesn't really care. You can put any type of data in any column Same column may have different types in different rows Database Design and Web Implementation 12

12 SQLite's Typing System! Storage Rules For columns of type Text: NULL or converted to Text Numeric: All types Integer: Same as numeric, but float types without decimals will be converted to int Float: Same as numeric but integers converted to floating point None: Anything goes Database Design and Web Implementation 13

13 MySQL Syntax CREATE TABLE `professor` ( `professor_id` int(11) NOT NULL AUTO_INCREMENT, `first_name` varchar(255) NOT NULL, `last_name` varchar(255) NOT NULL, PRIMARY KEY (`professor_id`) ) ENGINE=InnoDB; CREATE TABLE `class` ( `class_id` int(11) NOT NULL AUTO_INCREMENT, `class_name` varchar(255) DEFAULT NULL, `professor_id` int(11) DEFAULT NULL, PRIMARY KEY (`class_id`), UNIQUE KEY `class_name` (`class_name`), FOREIGN KEY (`professor_id`) REFERENCES `professor` (`professor_id`) ) ENGINE=InnoDB; Database Design and Web Implementation 14

14 SQLite Syntax CREATE TABLE professor ( professor_id INTEGER PRIMARY KEY AUTOINCREMENT, first_name TEXT NOT NULL, last_name TEXT NOT NULL ); CREATE TABLE class ( class_id INTEGER PRIMARY KEY AUTOINCREMENT, class_name TEXT UNIQUE DEFAULT NULL, professor_id INTEGER REFERENCES professor(professor_id) ); Database Design and Web Implementation 15

15 Por Exemplo! Lets create some tables in SQLite! Start sqlite3! Note - for foreign key constraints to work we must type the following PRAGMA foreign_keys = ON;! To make things pretty.headers on.mode column.nullvalue [NULL] Database Design and Web Implementation 16

16 Por Exemplo El Numero Dos! Let's recreate the professor's example and explore JOIN syntax in SQLite. Database Design and Web Implementation 17

17 SQLite in Python! SQLite is built into more recent versions of Python! The basics import sqlite3 connection = sqlite3.connect(path_to_database_file) cursor = connection.cursor() response = cursor.execute(sql) response.fetchone() #get one row from response for row in response: #iterate over all rows in response Database Design and Web Implementation 18

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