作品UI图
核心代码
MainActivity
public class MainActivity extends ActionBarActivity {
private MyDatabaseHelper dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHelper = new MyDatabaseHelper(this, "BookStore.db", null,2);
Button createDatabase = (Button)findViewById(R.id.create_database);
createDatabase.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
dbHelper.getWritableDatabase();
}
});
Button addData = (Button) findViewById(R.id.add_data);
addData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", "The Da Vinci Code");
values.put("author", "dan brown");
values.put("pages",454);
values.put("price", 16.96);
db.insert("Book", null, values);
values.clear();
values.put("name", "The Lost Symbol");
values.put("author", "dan brown");
values.put("pages",510);
values.put("price", 19.95);
db.insert("Book", null, values);
}
});
Button updateData = (Button) findViewById(R.id.updata_data);
updateData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("price", 10.99);
db.update("Book", values, "name=?",new String[]{"The Da Vinci Code"});
}
});
Button deleteButton = (Button)findViewById(R.id.delete_data);
deleteButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.delete("Book", "pages > ?", new String[]{"500"});
}
});
Button queryButton = (Button)findViewById(R.id.query_data);
queryButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.query("Book", null, null, null, null, null, null);
if(cursor.moveToFirst()){
do{
String name = cursor.getString(cursor.getColumnIndex("name"));
String author = cursor.getString(cursor.getColumnIndex("author"));
int pages = cursor.getInt(cursor.getColumnIndex("pages"));
double price = cursor.getDouble(cursor.getColumnIndex("price"));
Log.d("MainActivity", "book name is "+name);
Log.d("MainActivity", "book author is "+author);
Log.d("MainActivity", "book pages is "+pages);
Log.d("MainActivity", "book prices is "+price);
}while(cursor.moveToNext());
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}MyDataHeleper
public class MyDatabaseHelper extends SQLiteOpenHelper{
public static final String CREATE_BOOK = "create table Book("
+"id integer primary key autoincrement,"
+"author text," +
"price real," +
"pages integer," +
"name text)";
public static final String CREARE_CATEGORY = "create table Category("
+"id integer primary key autoincrement," +
"category_name text," +
"category_code integer)";
private Context mContext;
public MyDatabaseHelper(Context context,String name,CursorFactory factory,int version){
super(context,name,factory,version);
mContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_BOOK);
db.execSQL(CREARE_CATEGORY);
Toast.makeText(mContext, "create succeeded", Toast.LENGTH_SHORT).show();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("drop table if exists Book");
db.execSQL("drop table if exists Category");
onCreate(db);
}
}