sqlite数据库的储存

1.创建类：MyDatabaseHelper.class

/**
 * Created by Administrator on 2017/6/15.
 */

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 CREATE_CATEGORY= "create table Category ("
            + "id integer primary key autoincrement, "
            + "category_name text,"
            + "Category_code integer)";

    private Context mContext;
    public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory,int version)
    {
          super(context,name,factory,version);
          mContext=context;
    }


    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_BOOK);
        db.execSQL(CREATE_CATEGORY);
        Toast.makeText(mContext, "create succeeded", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists Book  ");
        db.execSQL("drop table if exists Category ");
        onCreate(db);
    }

}

2.创建litepal.xml文件

   

<?xml version="1.0" encoding="utf-8"?>
<litepal>
    <dbname value="BootStore"   >
        <version value="1">
        </version>
        <list>

        </list>
    </dbname>
</litepal>

3.MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       final MyDatabaseHelper dbHelper =  new MyDatabaseHelper(this,"BookStore.db",null,2);
       Button createDatabase =  (Button)findViewById(R.id.create_database);
       Button addData =(Button)findViewById(R.id.add_data);
       Button updateData =(Button)findViewById(R.id.update_data);
        Button queryButton =(Button)findViewById(R.id.query_data);
        createDatabase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dbHelper.getWritableDatabase();
            }
        });

        addData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                  SQLiteDatabase db =  dbHelper.getWritableDatabase();
                  ContentValues values = new ContentValues();
//                开始组装第一条
                  values.put("name","this is first record");
                  values.put("author","lhl");
                  values.put("pages",100);
                  values.put("price",88);
                  db.insert("Book",null,values);
                  values.clear();

//                 开始第二条记录
                  values.put("name","this is second record");
                  values.put("author","lhl2");
                  values.put("pages",200);
                  values.put("price",188);
                  db.insert("Book",null,values);
                  values.clear();

            }
        });

        updateData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SQLiteDatabase db
                        =  dbHelper.getWritableDatabase();
                ContentValues values = new ContentValues();

            }
        });

     queryButton.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
              SQLiteDatabase db = dbHelper.getWritableDatabase();
             //查询book表中所有的数据
             Cursor cursor =db.query("Book",null,null,null,null,null,null);
             if (cursor.moveToFirst())
             {
                 do
                 {
                     //遍历cursor对象 ，取出数据并打印
                     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","name is "+ name);
                     Log.d("MainActivity","author is "+ author);
                     Log.d("MainActivity","pages is "+ pages);
                     Log.d("MainActivity","price is "+ price);
                 } while (cursor.moveToNext());

             }
             cursor.close();
         }
     });

    }
}

4.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.sh.databaetest"
          xmlns:android="http://schemas.android.com/apk/res/android">

    <application
        android:name="org.litepal.LitePalApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>