SQLite数据库的增删改查

1、数据库的CURD

public class PersonDao {
    private static final String TAG = "PersonDao";
    private MyDBOpenHelper dbOpenHelper;

    // 在personDao被new出来的时候 就完成初始化

    public PersonDao(Context context) {
        dbOpenHelper = new MyDBOpenHelper(context);
        // dbOpenHelper.getReadableDatabase()
        // dbOpenHelper.getWritableDatabase()
    }

    // 增删改查

    /**
     * 往数据库添加一条数据
     */
    public void add(String name, String phone) {
        boolean result = find(name);
        if (result)
            return;

        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
        if (db.isOpen()) {
            db.execSQL("insert into person (name,phone) values (?,?)",
                    new Object[] { name, phone });
            // 关闭数据库 释放数据库的链接
            db.close();
        }
    }

    /**
     * 查找数据库的操作
     */
    public boolean find(String name) {
        boolean result = false;
        SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
        if (db.isOpen()) {
            Cursor cursor = db.rawQuery("select * from person where name=?",
                    new String[] { name });
            if (cursor.moveToFirst()) {
                int index = cursor.getColumnIndex("phone"); // 得到phone在表中是第几列
                String phone = cursor.getString(index);
                Log.i(TAG, "phone =" + phone);
                result = true;

            }
            // 记得关闭掉 cursor
            cursor.close();
            result = false;
            // 释放数据库的链接
            db.close();
        }
        return result;
    }

    /**
     * 删除一条记录
     * 
     * @param name
     */
    public void delete(String name) {
        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
        if (db.isOpen()) {
            db.execSQL("delete from person where name =?",
                    new Object[] { name });
            db.close();
        }
    }

    /**
     * 更新一条记录
     * 
     */
    public void update(String name, String newname, String newphone) {
        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
        if (db.isOpen()) {
            db.execSQL("update person set name=? , phone=? where name=?",
                    new Object[] { newname, newphone, name });
            db.close();
        }
    }

    /**
     * 查找全部
     */
    public List<Person> getAllPersons() {
        List<Person> persons=null;
        SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
        if (db.isOpen()) {
            persons = new ArrayList<Person>();
            Cursor cursor = db.rawQuery("select * from person ", null);
            while (cursor.moveToNext()) {
                Person person = new Person();
                int nameindex = cursor.getColumnIndex("name");
                int phoneindex = cursor.getColumnIndex("phone");
                String name = cursor.getString(nameindex);
                String phone = cursor.getString(phoneindex);
                person.setName(name);
                person.setNumber(phone);
                persons.add(person);
            }
            cursor.close();
            db.close();
        }
        return persons;
    }

}

2、用junit测试

public class TestPersonDao extends AndroidTestCase {
    PersonDao dao;
    // 测试在执行测试代码时候的流程 
    //1 .new TestPersonDao 框架new出来 
    //2. 调用 setUp()
    //3. testAdd()  这个时候 上下文 才被创建出来 
    
    
/*    @Override
    protected void setUp() throws Exception {
        dao = new PersonDao(getContext());
        super.setUp();
    }*/
    public void testAdd() throws Exception{
        PersonDao dao = new PersonDao(getContext());
        for(int i=0;i<100;i++){
        dao.add("lisi"+i, "123456789"+i);
        }
    }
    public void testdelete() throws Exception{
        PersonDao dao = new PersonDao(getContext());
        dao.delete("lisi99");
    }
    public void testupdate() throws Exception{
        PersonDao dao = new PersonDao(getContext());
        dao.update("lisi98", "wangwu", "119");
    }
    
    public void testFindAll() throws Exception{
        PersonDao dao = new PersonDao(getContext());
        List<Person>  persons  = dao.getAllPersons();
        assertEquals(100, persons.size());
    }
 }

使用junit步骤：

Adndroid-Junit
1、AndroidManifest.xml添加
<instrumentation 
4　　 android:name="android.test.InstrumentationTestRunner"
　　android:targetPackage="cn.zengfansheng.db"
/>
2、<application>添加节点
　　<uses-library android:name="android.test.runner"/>