@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

init();

setAction();

}

/** 初始化View */

private void init() {

createDataBase = (Button) findViewById(R.id.create_database);

addData = (Button) findViewById(R.id.add_data);

updateData = (Button) findViewById(R.id.update_data);

deleteData = (Button) findViewById(R.id.delete_data);

queryData = (Button) findViewById(R.id.query_data);

replaceData = (Button) findViewById(R.id.replace_data);

/** 通过构造函数的参数将数据库信息指定成功;做数据库升级时要改版本号 1改为2 */

dbHelper = new MyDataBaseHelper(this, “BookStore.db”, null, 2);

}

/** 设置监听事件 */

private void setAction() {

createDataBase.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

dbHelper.getWritableDatabase();

}

});

addData.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

SQLiteDatabase db = dbHelper.getWritableDatabase();

ContentValues values = new ContentValues();

/** 开始组装第一组数据 */

values.put(“name”, “the Da Vinci Code”);

values.put(“author”, “dan Brown”);

values.put(“pages”, 454);

values.put(“price”, 16.96);

/** 插入第一条数据 */

db.insert(“book”, null, values);

values.clear();

/** 开始组装第二组数据 */

values.put(“name”, “the Last Symbol”);

values.put(“author”, “dan Brown”);

values.put(“pages”, 510);

values.put(“price”, 19.96);

/** 插入第二条数据 */

db.insert(“book”, null, values);

Toast.makeText(MainActivity.this, “inset succeeded----”,

Toast.LENGTH_SHORT).show();

}

});

updateData.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

SQLiteDatabase db = dbHelper.getWritableDatabase();

ContentValues values = new ContentValues();

values.put(“price”, 10.99);

/** 以下的意思是将名the Da Vinci Code这本书的价格改为10.99 */

db.update(“Book”, values, “name = ?”,

new String[] { “the Da Vinci Code” });

Toast.makeText(MainActivity.this, “update succeeded+++++++”,

Toast.LENGTH_SHORT).show();

}

});

deleteData.setOn

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ClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

SQLiteDatabase db = dbHelper.getWritableDatabase();

/** 删除页数超过500页的书籍 */

db.delete(“Book”, “pages > ?”, new String[] { “500” });

Toast.makeText(MainActivity.this, “delete succeeded$$$$$$$”,

Toast.LENGTH_SHORT).show();

}

});

queryData.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

SQLiteDatabase db = dbHelper.getWritableDatabase();

/** 查询表中所有的数据 */

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”));

} while (cursor.moveToNext());

}

cursor.close();

Toast.makeText(MainActivity.this, “query succeeded@@@@@@”,

Toast.LENGTH_SHORT).show();

}

});

/** 使用事务进行数据的更换，这样会比较安全 */

replaceData.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

SQLiteDatabase db = dbHelper.getWritableDatabase();

/** 开启事务 作用：删除表里面的数据的时，要么成功，要么失败，两个事件只能同时完成 */

db.beginTransaction();

try {

db.delete(“Book”, null, null);

if (true) {

/** 这里抛出一个异常，让事务失败 */

throw new NullPointerException();

}

@SuppressWarnings(“unused”)

ContentValues values = new ContentValues();

values.put(“name”, “Game of Thrones”);

values.put(“author”, “George Martin”);

values.put(“pages”, 720);

values.put(“price”, 20.55);

db.insert(“Book”, null, values);

/** 事务已经执行完成 */

db.setTransactionSuccessful();

} catch (Exception e) {

e.printStackTrace();