我希望获得与用户获得的某些分数相对应的智商水平。我在资源文件夹中有我的数据库。数据库已成功创建并打开。但它显示NO SUCH TABLE ERROR，而我100％确定该表存在于我的score.db文件中。
public class DatabaseHelper extends SQLiteOpenHelper {
String DB_PATH = null;
private static String DB_NAME = "score";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 10);
this.myContext = context;
this.DB_PATH = "/data/data/" + "com.example.madhav.loginandreg" + "/" + "databases/";
Log.e("Path 1", DB_PATH);
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[10];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (newVersion > oldVersion)
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
public Cursor query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) {
return myDataBase.query(table, columns, null, null, null, null, null);
}
public String getiqscore(int rawscore,String condition,String age,String what){
String query="Select "+what +" from " +age+ " where " +condition+"="+rawscore+";";
String data=null;
myDataBase=this.getReadableDatabase();
Cursor cursor=myDataBase.rawQuery(query,null);
cursor.moveToFirst();
if (cursor.getString(cursor.getColumnIndex(what)) != null)
data = cursor.getString(cursor.getColumnIndex(what));
cursor.close();
myDataBase.close();
return data;
}
}
上述指定代码的Java文件： -
public class information extends AppCompatActivity {
RadioGroup[] rp= new RadioGroup[11] ;
int score=0;
DatabaseHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_information);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
db=new DatabaseHelper(information.this);
try {
db.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
db.openDataBase();
} catch (Exception sqle) {
throw sqle;
}
rp[0]=(RadioGroup) findViewById(R.id.q1);
rp[0]=(RadioGroup) findViewById(R.id.q1);
rp[1]=(RadioGroup) findViewById(R.id.q2);
rp[2]=(RadioGroup) findViewById(R.id.q3);
rp[3]=(RadioGroup) findViewById(R.id.q4);
rp[4]=(RadioGroup) findViewById(R.id.q5);
rp[5]=(RadioGroup) findViewById(R.id.q6);
rp[6]=(RadioGroup) findViewById(R.id.q7);
rp[7]=(RadioGroup) findViewById(R.id.q8);
rp[8]=(RadioGroup) findViewById(R.id.q9);
rp[9]=(RadioGroup) findViewById(R.id.q10);
rp[10]=(RadioGroup) findViewById(R.id.q11);
}
public void submit(View view){
for(int i=0 ; i<11 ; i++){
String id= String.valueOf(rp[i].getCheckedRadioButtonId());
int idi;
try{
idi=rp[i].getCheckedRadioButtonId();
RadioButton r=(RadioButton) findViewById(idi);
String a= (String) r.getText();
if(a.equalsIgnoreCase("1 ")){
score++;
}
}catch (Exception e){
Toast.makeText(this,"Error",Toast.LENGTH_SHORT);
}
}
Toast.makeText(this,String.valueOf(score),Toast.LENGTH_SHORT).show();
int a=Integer.valueOf(score);
String iq= db.getiqscore(a,"VinfoRs","age10","VinfoTq");
Toast.makeText(this,iq,Toast.LENGTH_SHORT).show();
// Intent intent=new Intent(this,activity3.class);
//startActivity(intent);
}
}
enter code here java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: android.database.sqlite.SQLiteException: no such table: age10 (code 1): , while compiling: Select VinfoTq from age10 where VinfoRs=11;
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:1318)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1257)
at com.example.madhav.loginandreg.DatabaseHelper.getiqscore(DatabaseHelper.java:111)
at com.example.madhav.loginandreg.information.submit(information.java:80)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
答案 0 :(得分：0)
删除byte中的静态值并使用InputStream中的实际值。
private void copyDataBase() throws IOException {
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[myInput.available()];
myInput.read(buffer);
myOutput.write(buffer);
myOutput.close();
myInput.close();
}
答案 1 :(得分：0)
您的数据库创建逻辑看起来很奇怪。我无法弄清楚DatabaseHelper正在扩展SQLiteOpenHelper的原因。您拨打SQLiteOpenHelper时唯一使用this.getReadableDatabase()功能的地方。但即便如此也是错误的。你不能使用它返回的SQLiteDatabase，并且（!!）你不能关闭它。
相反，您似乎将模板数据库文件复制到刚刚创建的只读数据库的顶部，然后打开它。我不知道会做什么，但实际上你最终可能会返回一个引用你的只读数据库的SQLiteDatabase ...这可能是空的。
无论哪种方式，这种逻辑似乎都被打破了。 （而且我不是Android程序员......）