我一直试图让这个数据库运行4天并出现同样的错误。我已经耗尽了所有资源。谁知道这里发生了什么？此代码在我的主要活动上。
public static SQLiteHelper sqLiteHelper;
final int REQUEST_CODE_GALLERY = 999;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
sqLiteHelper = new SQLiteHelper(this, "FoodDB.sqlite", null, 1);
sqLiteHelper.queryData("CREATE TABLE IF NOT EXISTS FOOD (Id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, image BLOG)");
btnChoose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ActivityCompat.requestPermissions(
MainActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_CODE_GALLERY
);
}
});
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
sqLiteHelper.insertData(
edtName.getText().toString().trim(),
edtPrice.getText().toString().trim(),
imageViewToByte(imageView)
);
Toast.makeText(getApplicationContext(), "Entry Added", Toast.LENGTH_LONG).show();
edtName.setText("");
edtPrice.setText("");
imageView.setImageResource(R.mipmap.ic_launcher);
}
catch(Exception e)
{
e.printStackTrace();
}
}
});
btnList.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, FoodList.class);
startActivity(intent);
}
});
}
private byte[] imageViewToByte(ImageView image) {
Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
return byteArray;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == REQUEST_CODE_GALLERY) {
if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, REQUEST_CODE_GALLERY);
}
else {
Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_LONG).show();
}
return;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_CODE_GALLERY && resultCode == RESULT_OK && data != null) {
Uri uri = data.getData();
try {
InputStream inputStream = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
imageView.setImageBitmap(bitmap);
}
catch (FileNotFoundException e){
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
private void init() {
edtName = (EditText) findViewById(R.id.edtName);
edtPrice = (EditText) findViewById(R.id.edtPrice);
btnChoose = (Button) findViewById(R.id.btnChoose);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnList = (Button) findViewById(R.id.btnList);
imageView = (ImageView) findViewById(R.id.imageView);
}
}
这是我的SQLite Helper.Im对SQLite来说很新，所以我为无知而道歉。
public class SQLiteHelper extends SQLiteOpenHelper {
public SQLiteHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, name, factory, version);
}
public void queryData(String sql) {
SQLiteDatabase database = getWritableDatabase();
database.execSQL(sql);
}
public void insertData(String name, String price, byte[] image) {
SQLiteDatabase database = getWritableDatabase();
String sql = "INSERT INTO FOOD VALUES (NULL, ?, ?, ?)";
SQLiteStatement statement = database.compileStatement(sql);
statement.clearBindings();
statement.bindString(1, name);
statement.bindString(2, price);
statement.bindBlob(3, image);
statement.executeInsert();
}
public Cursor getData(String sql) {
SQLiteDatabase database = getReadableDatabase();
return database.rawQuery(sql, null);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
}
这是我的logcat读数。
12-18 17:17:12.468 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err:
#################################################################
12-18 17:17:12.468 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: Error Code : 1 (SQLITE_ERROR)
12-18 17:17:12.468 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: Caused By : SQL(query) error or missing database.
12-18 17:17:12.468 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: (table FOOD has 3 columns but 4 values were supplied (code 1): , while compiling: INSERT INTO FOOD VALUES (NULL, ?, ?, ?))
12-18 17:17:12.468 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: #################################################################
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1008)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:573)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1306)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at stash.media.devsolutionsbeyond.sqlite.SQLiteHelper.insertData(SQLiteHelper.java:29)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at stash.media.devsolutionsbeyond.sqlite.MainActivity$2.onClick(MainActivity.java:63)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.view.View.performClick(View.java:6207)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.widget.TextView.performClick(TextView.java:11094)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.view.View$PerformClick.run(View.java:23639)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.os.Handler.handleCallback(Handler.java:751)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.os.Looper.loop(Looper.java:154)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6688)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at java.lang.reflect.Method.invoke(Native Method)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
12-18 17:17:12.469 3678-3678/stash.media.devsolutionsbeyond.sqlite I/Choreographer: Skipped 513 frames! The application may be doing too much work on its main thread.
答案 0 :(得分：0)
在运行应用之前，请先添加价格列或将insertData方法更改为： -
public void insertData(String name, String price, byte[] image) {
SQLiteDatabase database = getWritableDatabase();
String sql = "INSERT INTO FOOD VALUES (null, ?, ?)";
SQLiteStatement statement = database.compileStatement(sql);
statement.clearBindings();
statement.bindString(1, name);
//statement.bindString(2, price); //<<<< needs price column
statement.bindBlob(2, image);
statement.executeInsert();
}
上面的代码对我有用，至少在添加条目时（虽然我确实使用了以下内容来避免Null指针异常并且还避免获取图像）： -
sqLiteHelper.insertData(
edtName.getText().toString().trim(),
edtPrice.getText().toString().trim(),
new byte[]{1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9}
//imageViewToByte(imageView)
);
而不是拥有图像。也许最初使用它作为它所代表的要添加的图像可以为null（即，您应该在插入之前验证输入。）
如果你去添加价格列路线然后删除应用程序的数据或取消安装应用程序然后更改： -
sqLiteHelper.queryData("CREATE TABLE IF NOT EXISTS FOOD (Id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, image BLOG)");到
sqLiteHelper.queryData("CREATE TABLE IF NOT EXISTS FOOD (Id INTEGER PRIMARY KEY, name TEXT, price TEXT image BLOG)");
注意！
AUTOINCREMENT ，并且很可能不会想要使用AUTOINCREMENT的弊端。