我正在开发从SQLite数据库加载数据的Android应用程序。我曾尝试从MainActivity打开我的数据库，没有问题。当我从我的SQLController调用一个方法时，它收到错误（应用程序未打开）。
SQLController：
public class SQLController {
private DBHelper dbhelper;
private Context ourcontext;
private SQLiteDatabase database;
public SQLController(Context c) {
ourcontext = c;
}
public SQLController open() throws SQLException {
dbhelper = new DBHelper(ourcontext);
database = dbhelper.getWritableDatabase();
return this;
}
public void close() {
dbhelper.close();
}
public ArrayList<Crops> getCrops(){
ArrayList<Crops> listCrops = new ArrayList<>();
String[] allColumns = new String[] { DBHelper.CROPS_ID, DBHelper.IS_FAVOURITE,
DBHelper.ID_NAME, DBHelper.EN_NAME, DBHelper.SPECIES, DBHelper.GENUS,
DBHelper.FAMILY, DBHelper.ORDER, DBHelper.CLASS, DBHelper.DIVISION,
DBHelper.KINGDOM, DBHelper.CATEGORY_ID, DBHelper.PICT};
Cursor c = database.query(DBHelper.TABLE_CROPS,allColumns,null,null,null,null,null);
if (c != null && c.moveToFirst()) {
do {
Crops crops = new Crops();
crops.setId(c.getLong(c.getColumnIndex(DBHelper.CROPS_ID)));
crops.setIdNname(c.getString(c.getColumnIndex(DBHelper.ID_NAME)));
crops.setIsFavourite(c.getLong(c.getColumnIndex(DBHelper.IS_FAVOURITE)));
crops.setEnName(c.getString(c.getColumnIndex(DBHelper.EN_NAME)));
crops.setSpecies(c.getString(c.getColumnIndex(DBHelper.SPECIES)));
crops.setGenus(c.getString(c.getColumnIndex(DBHelper.GENUS)));
crops.setFamily(c.getString(c.getColumnIndex(DBHelper.FAMILY)));
crops.setOrder(c.getString(c.getColumnIndex(DBHelper.ORDER)));
crops.setClasss(c.getString(c.getColumnIndex(DBHelper.CLASS)));
crops.setDivision(c.getString(c.getColumnIndex(DBHelper.DIVISION)));
crops.setCategoryId(c.getLong(c.getColumnIndex(DBHelper.CATEGORY_ID)));
crops.setPict(c.getString(c.getColumnIndex(DBHelper.PICT)));
listCrops.add(crops);
} while (c.moveToNext());
}
if (c != null) {
c.close();
}
return listCrops;
}
}
测试方法的MainActivity：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbcont = new SQLController(this);
try {
dbcont.open();
cropses = dbcont.getCrops();
dbcont.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
当我删除cropses = dbcont.getCrops();时，应用程序正在运行。
更新： Logcat：
04-27 00:37:15.245 2003-2003/com.mundane.hortipedia E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.mundane.hortipedia, PID: 2003
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mundane.hortipedia/com.mundane.hortipedia.MainActivity}: android.database.sqlite.SQLiteException: near "order": syntax error (code 1): , while compiling: SELECT _id, is_favourite, id_name, en_name, species, genus, family, order, class, division, kingdom, category_id, pict FROM crops
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: android.database.sqlite.SQLiteException: near "order": syntax error (code 1): , while compiling: SELECT _id, is_favourite, id_name, en_name, species, genus, family, order, class, division, kingdom, category_id, pict FROM crops
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.mundane.hortipedia.db.SQLController.getCrops(SQLController.java:42)
at com.mundane.hortipedia.MainActivity.onCreate(MainActivity.java:54)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)