Create a local SQL database hosting a CUSTOMER table. Each customer includes [id, name, phone]. Do the work inside Threads and Asynctasks.
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1 CIS 470 Lesson 13 Databases - Quick Notes Create a local SQL database hosting a CUSTOMER table. Each customer includes [id, name, phone]. Do the work inside Threads and Asynctasks. package csu.matos; import android.app.activity; import android.app.progressdialog; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteexception; import android.os.asynctask; import android.os.bundle; import android.os.environment; import android.os.handler; import android.os.message; import android.util.log; import android.view.view; import android.widget.button; import android.widget.chronometer; import android.widget.textview; import java.util.date; public class MainActivity extends Activity { TextView txtmsg; Button btnalive; Button btnaddmany; Button btncreatedb; Chronometer chronometer; Boolean alive = true; Thread backgroundworker1; Handler handler = new Handler() { public void handlemessage(message msg) { super.handlemessage(msg); int what = msg.what; String obj = (String) msg.obj; txtmsg.append("\n WHAT=" + what + " OBJ=" + obj + "\n"); ; SQLiteDatabase db; protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); chronometer = (Chronometer)findViewById(R.id.chronometer); chronometer.start(); txtmsg = (TextView) findviewbyid(r.id.txtmsg); btnalive = (Button) findviewbyid(r.id.btnalive); btnalive.setonclicklistener(new View.OnClickListener() { String m = "Agile Main says: " + new Date().toString(); txtmsg.settext(m + "\n"); );
2 btncreatedb = (Button) findviewbyid(r.id.btncreatedb); btncreatedb.setonclicklistener(new View.OnClickListener() { ); txtmsg.append("\ncreatedb\n"); backgroundworker1.start(); btnaddmany = (Button) findviewbyid(r.id.btnaddmany); btnaddmany.setonclicklistener(new View.OnClickListener() { ); txtmsg.settext("many"); new VerySlowTask().execute("dummy1", "dummy2"); backgroundworker1 = new Thread() { public void run() { super.run(); //open or create database String SDcardPath = Environment.getExternalStorageDirectory().getPath() + "/"; db = MainActivity.this.openOrCreateDatabase(SDcardPath + "MYDATABASE1", MODE_PRIVATE, null); String d = "Backworker says: SD Database created " + new Date().toString(); Message msg = handler.obtainmessage(1, d); //create CUSTOMER table String sqlstm = ""; sqlstm = "drop table if exists customer"; msg = handler.obtainmessage(1, "Table dropped " + new Date().toString()); sqlstm = "CREATE TABLE [customer] (" + "[id] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT," + "[custname] TEXT NULL," + "[phone] TEXT NULL" + ")"; msg = handler.obtainmessage(1, "Table opened/created " + new Date().toString()); // insert two customer records in the database sqlstm = "insert into customer (custname, phone) " + "values ('Daenerys Targaryen', ' ');"; sqlstm = "insert into customer (custname, phone) " + "values('tiryon Lannister', ' ');"; msg = handler.obtainmessage(1, " two records inserted " + new Date().toString());
3 ; catch (SQLiteException e) { msg = handler.obtainmessage(1, "Problems: Table NOT created"); finally { // query: select customers Cursor c1 = db.rawquery("select * from customer", null); //c1.movetoposition(-1); //go prior to top while (c1.movetonext()) { int recid = c1.getint(0); String name = c1.getstring(1); String phone = c1.getstring(c1.getcolumnindex("phone")); // do something with the record here... msg = handler.obtainmessage(1, "record selected " + recid + " " + name + " " + phone); catch (SQLiteException e) { //report problems finally { Log.e("BACKWORKER>>>", "Time to die..."); //oncreate // private class VerySlowTask extends AsyncTask<String, Long, Void> { private final ProgressDialog dialog = new ProgressDialog(MainActivity.this); String waitmsg = "Adding customers... "; Long startingmillis; String sqlstm; Message msg; // Begin - can use UI thread here protected void onpreexecute() { startingmillis = System.currentTimeMillis(); txtmsg.settext("start Time: " + startingmillis); this.dialog.setmessage(waitmsg); this.dialog.setcancelable(false); //outside touch doesn't dismiss you this.dialog.show();
4 // this is the SLOW background thread taking care of heavy tasks & cannot directly change UI // add 1000 customers to the database protected Void doinbackground(final String... args) { for (Long i = 1000L; i <= 2000L; i++) { if ( i > 0 && i % 100 == 0 ) { //inform of progress after inserting batches of 100 rec. publishprogress((long) i); msg = handler.obtainmessage(1, (1000-i) + "-records inserted " ); String custname = "'custfirstname + custlast" + i + "'"; String custphone= "'555-" + i + "'"; sqlstm = "insert into customer (custname, phone) values(" + custname + ", " + custphone + ");"; catch (SQLiteException e) { msg = handler.obtainmessage(1, "multi-insertion did not work"); finally { //TODO... //retrieve customers whose id ends on '00' Cursor c1 = db.rawquery("select * from customer where (id % 100 = 0);", null); while (c1.movetonext()) { int recid = c1.getint(0); String name = c1.getstring(1); String phone = c1.getstring(c1.getcolumnindex("phone")); Message msg = handler.obtainmessage(1, "record selected\n" + recid + " " + name + " " + phone); catch (SQLiteException e) { //report problems finally { return null; // periodic updates - it is OK to change UI protected void onprogressupdate(long... value) { super.onprogressupdate(value); dialog.setmessage(waitmsg + value[0]); // End - can use UI thread here protected void onpostexecute(final Void unused) { if (this.dialog.isshowing()) { this.dialog.dismiss(); // cleaning-up, all done
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