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SQLite

SQLite. What is SQLite?. Open Source Database embedded in Android SQL syntax Requires small memory at runtime (250 Kbytes) Lightweight More info at: http ://www.sqlite.org. Types in SQLite. TEXT (similar to String in Java) INTEGER  (similar to long in Java)

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SQLite

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  1. SQLite CS440

  2. What is SQLite? • Open Source Database embedded in Android • SQL syntax • Requires small memory at runtime (250 Kbytes) • Lightweight • More info at: http://www.sqlite.org CS440

  3. Types in SQLite • TEXT (similar to String in Java) • INTEGER (similar to long in Java) • REAL (similar to double in Java) CS440

  4. Getting started • Download SQLite: http://www.sqlite.org/download.html • Open a command prompt • Create your first db: • sqlite3 myDB.db • create table tbl1(one varchar(10), two smallint); • insert into tbl1 values('hello!',10); • insert into tbl1 values('goodbye', 20); • select * from tbl1; CS440

  5. CREATE • Create a new table to add your data • Tables in databases are like excel spreadsheets CREATE TABLE employers ( _id INTEGER PRIMARY KEY, company_name TEXT); CREATE TABLE employees ( name TEXT, annual_salary REAL NOT NULL CHECK, employer_id REFERENCES employers(_id)); CS440

  6. SQLite Types • TEXT • REAL • BLOB • INTEGER CS440

  7. INSERT • Adds a new data row INSERT INTO contacts(first_name) VALUES(“Thomas”); INSERT INTO employers VALUES(1, “Acme Balloons”); INSERT INTO employees VALUES(“Wile E. Coyote”, 1000000.000, 1); CS440

  8. SELECT • Querying a database • Returns one or multiple rows of results SELECT * FROM contacts; SELECT first_name, height_in_meters FROM contacts WHERE last_name = “Smith”; SELECT employees.name, employers.name FROM employees, employers WHERE employee.employer_id = employer._id ORDER BY employer.company_name ASC; CS440

  9. References • http://www.vogella.de/articles/AndroidSQLite/article.html#overview CS440

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