糖 ORM 和 Android

Question

按照文档操作后，我成功添加了 jars 并实现了示例代码：

public class Book extends SugarRecord{
   String title;
   String edition;

   public Book(){

   }
   public Book(String title, String edition){
       this.title = title;
       this.edition = edition;
   }
}

我的主要 Activity 是：

public class MainActivity extends Activity implements View.OnClickListener {
  Button btnAdd;
  EditText txtedition, txttitle;



  @Override
  protected void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      btnAdd = (Button) findViewById(R.id.btnadd);
      btnAdd.setOnClickListener(this);



      txtedition = (EditText) findViewById(R.id.txtedition);
      txttitle = (EditText) findViewById(R.id.txttitle);

  }

  @Override
  public void onClick(View v) {

      String edition = txtedition.getText().toString();
      String title = txttitle.getText().toString();
      switch (v.getId()) {
          case R.id.btnadd:
              Book book = new Book(title, edition);
              book.save();
              break;

      }
  }
}

我的应用程序构建成功，但是当我按下添加按钮时，出现以下异常：

FATAL EXCEPTION: main Process: com.example.agds.demo, PID: 7939 android.database.sqlite.SQLiteException: no such table: BOOK (code 1): , while compiling: INSERT OR REPLACE INTO BOOK(TITLE,ID,EDITION) VALUES (?,?,?) ################################################################# Error Code : 1 (SQLITE_ERROR) Caused By : SQL(query) error or missing database. (no such table: BOOK (code 1): , while compiling: INSERT OR REPLACE INTO BOOK(TITLE,ID,EDITION) VALUES (?,?,?)) ################################################################# at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1058) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:623) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:59) at android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:31) at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1607) at com.orm.SugarRecord.save(SugarRecord.java:266) at com.orm.SugarRecord.save(SugarRecord.java:360) at com.example.agds.demo.MainActivity.onClick(MainActivity.java:49) at android.view.View.performClick(View.java:5702) at android.widget.TextView.performClick(TextView.java:10888) at android.view.View$PerformClick.run(View.java:22541) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7229) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

有什么建议吗？

Answer 1

您是否已将这些元数据添加到您的中的 AndroidManifest 中？

<meta-data android:name="DATABASE" android:value="sugar_example.db" />
<meta-data android:name="VERSION" android:value="2" />
<meta-data android:name="QUERY_LOG" android:value="true" />
<meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="com.example.yourmodels" />

另外，把这个放在你的<aplication>

android:name="com.orm.SugarApp"

这是库中的一个应用程序 class。

https://github.com/chennaione/sugar/blob/master/library/src/main/java/com/orm/SugarApp.java

或者，如果您已经有自己的应用程序 class，您可以扩展它。

public class YourApp extends SugarApp {
}

Answer 2

请注意，如果您在 Android Studio 中启用了 Instant 运行，Sugar 将无法工作（至少它不会创建新表）。

糖 ORM 和 Android

Sugar ORM and Android

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