Dasar query basis data dengan SQLite

Pokok Bahasan Basis Data Mobile dengan SQLite Membuat Basis Data Mobile Menginput data pada SQLite Membaca data Mengubah dan Menghapus data Menampilkan query dan hasil query basis data ke dalam log.

Membuat Basis Data C:\sqlite>sqlite3.exe mobile.db SQLite version 3.8.4.3 2014-04-03 16:53:12 Enter ".help" for usage hints. sqlite> .databases seq name file --- --------------- ---------------------- 0 main C:\sqlite\mobile.db

Contoh Struktur Tabel

Membuat Tabel create table contacts( id integer primary key autoincrement not null, name text, phone_number text ); Menampilkan list table dalam database sqlite> .tables Menampilkan skema table contacts sqlite> .schema contacts

Input Data SQLite sqlite> insert into contacts (name, phone_number) values (‘tester','0856414412xx'); values (‘Bejo Selamet','0856414413xx'); Note Kolom id tidak diisi, karena kolom otomatis melakukan autoincrement id

Menampilkan Isi Data sqlite> .header on sqlite> .mode column sqlite> select * from contacts; id name phone_number ---------- -------------- ------------ 1 Tester 0856414412xx 2 Bejo Selamet 0856414413xx Note : Kolom id terisi secara otomatis terurut

Mengubah Data Mengubah phone_number pada data yang memiliki id=2 sqlite> update contacts set phone_number='08564123456x' where id='2'; sqlite> .header on sqlite> .mode column sqlite> select * from contacts; id name phone_number ---------- -------------- ------------ 1 Tester 0856414412xx 2 Bejo Selamet 08564123456x

Menghapus Data Menghapus data yang memiliki id=2 sqlite> delete from contacts where id='2'; sqlite> .header on sqlite> .mode column sqlite> select * from contacts; id name phone_number --------- -------------- ------------ 1 Tester 0856414412xx

public long insert (String table, String nullColumnHack, ContentValues values) Convenience method for inserting a row into the database. Table the table to insert the row into NullColumnHack optional; may be null. SQL doesn't allow inserting a completely empty row without naming at least one column name. If your provided values is empty, no column names are known and an empty row can't be inserted. If not set to null, the nullColumnHack parameter provides the name of nullable column name to explicitly insert a NULL into in the case where your values is empty. values this map contains the initial column values for the row. The keys should be the column names and the values the column values Returns the row ID of the newly inserted row, or -1 if an error occurred

public void put (String key, byte[] value) Adds a value to the set. Parameters key the name of the value to put value the data for the value to put

public int update (String table, ContentValues values, String whereClause, String[] whereArgs) Convenience method for updating rows in the database. Table the table to update in Values a map from column names to new column values. null is a valid value that will be translated to NULL. whereClause the optional WHERE clause to apply when updating. Passing null will update all rows. whereArgs You may include ?s in the where clause, which will be replaced by the values from whereArgs. The values will be bound as Strings. Returns the number of rows affected

public int delete (String table, String whereClause, String[] whereArgs) Convenience method for deleting rows in the database. Table the table to delete from WhereClause the optional WHERE clause to apply when deleting. Passing null will delete all rows. WhereArgs You may include ?s in the where clause, which will be replaced by the values from whereArgs. The values will be bound as Strings. Returns the number of rows affected if a whereClause is passed in, 0 otherwise. To remove all rows and get a count pass "1" as the whereClause.

Menulis Log Log berguna ketika kita akan menginisialisasi ,melihat kinerja code kita dsb, di jme/j2me  kita dapat menggunakansystem.out.println untuk menampilkan log ke standart output di android kita  dapat menggunakan Log.d(“tag/judul”,”isi log anda”); jangan lupa import kebutuhan fungsi import android.util.Log; untuk tipe – tipe log Log.v(); // Verbose Log.d(); // Debug Log.i(); // Info Log.w(); // Warning Log.e(); // Error

Code Untuk Mampilkan Log // Reading all contacts Log.d("Reading: ", "Reading all contacts.."); List<Contact> contacts = db.getAllContacts(); for (Contact cn : contacts) { String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() + " ,Phone: " + cn.getPhoneNumber(); // Writing Contacts to log Log.d("Name: ", log); }

Android Log Cat Report I am writing output to Log report. You can see your log report by going to  Windows ⇒ Show View ⇒ Other.. ⇒ Android ⇒ Log Cat.

SQLite Output Log

Sumber https://www.sqlite.org/cli.html http://www.androidhive.info/2011/11/android-sqlite-database- tutorial/ http://www.tutorialspoint.com/sqlite