用SQLiteOpenHelper创建数据库

创建数据库

public class MyDatabaseHelper extends SQLiteOpenHelper
{
	final String CREATE_TABLE_SQL =
		"create table dict(_id integer primary key autoincrement , word , detail)";
	/**
	 * @param context
	 * @param name
	 * @param version
	 */
	public MyDatabaseHelper(Context context, String name, int version)
	{
		super(context, name, null, version);
	}

	@Override
	public void onCreate(SQLiteDatabase db)
	{
		// 第一个使用数据库时自动建表
		db.execSQL(CREATE_TABLE_SQL);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
	{
		System.out.println("--------onUpdate Called--------" 
			+ oldVersion + "--->" + newVersion);
	}
}

使用刚刚创建的数据库

public class Dict extends Activity
{
	MyDatabaseHelper dbHelper;
	Button insert = null;
	Button search = null;
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);		
		// 创建MyDatabaseHelper对象，指定数据库版本为1，此处使用相对路径即可，
		// 数据库文件自动会保存在程序的数据文件夹的databases目录下。
		dbHelper = new MyDatabaseHelper(this 
			, "myDict.db3" , 1);
		insert = (Button)findViewById(R.id.insert);
		search = (Button)findViewById(R.id.search);	
		insert.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				//获取用户输入
				String word = ((EditText)findViewById(R.id.word))
					.getText().toString();
				String detail = ((EditText)findViewById(R.id.detail))
					.getText().toString();
				//插入生词记录
				insertData(dbHelper.getReadableDatabase() , word , detail);
				//显示提示信息
				Toast.makeText(Dict.this, "添加生词成功！" , 8000)
					.show();
			}			
		});	

		search.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				// 获取用户输入
				String key = ((EditText) findViewById(R.id.key)).getText()
					.toString();
				// 执行查询
				Cursor cursor = dbHelper.getReadableDatabase().rawQuery(
					"select * from dict where word like ? or detail like ?", 
					new String[]{"%" + key + "%" , "%" + key + "%"});
				
				//创建一个Bundle对象
				Bundle data = new Bundle();
				data.putSerializable("data", converCursorToList(cursor));
				//创建一个Intent
				Intent intent = new Intent(Dict.this
					, ResultActivity.class);
				intent.putExtras(data);
				//启动Activity
				startActivity(intent);
			}
		});
	}

	protected ArrayList>
		converCursorToList(Cursor cursor)
	{
		ArrayList> result = 
			new ArrayList>();
		//遍历Cursor结果集
		while(cursor.moveToNext())
		{
			//将结果集中的数据存入ArrayList中
			Map map = new 
				HashMap();
			//取出查询记录中第2列、第3列的值
			map.put("word" , cursor.getString(1));
			map.put("detail" , cursor.getString(2));
			result.add(map);
		}
		return result;		
	}
	private void insertData(SQLiteDatabase db
		, String word , String detail)
	{
		//执行插入语句
		db.execSQL("insert into dict values(null , ? , ?)"
			, new String[]{word , detail});
	}
	@Override
	public void onDestroy()
	{
		super.onDestroy();
		//退出程序时关闭MyDatabaseHelper里的SQLiteDatabase
		if (dbHelper != null)
		{
			dbHelper.close();
		}
	}
}