Question

我正在尝试写入数据库。我编写了所有代码并创建了一个按钮，当我按下它时，我在EditTexts中写入的数据应该添加到数据库中。但是当我按下按钮将数据添加到数据库时，应用程序崩溃了。

这是主要活动代码：

public class MainActivity extends AppCompatActivity {

    Button button1;
    database database1;
    Button button2, SendData;
    EditText editNOH, Hint;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        database1 = new  database(this);

        button1 =(Button) findViewById(R.id.button);
        button2 = (Button) findViewById(R.id.button4);
        SendData = (Button)findViewById(R.id.button5);
        editNOH = (EditText)findViewById(R.id.editText3);
        Hint = (EditText)findViewById(R.id.editText2);
        AddData();
        viewAll();

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, Main2Activity.class));
            }
        });}
    public void viewAll(){
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Cursor res =  database1.getData();
                if (res.getCount() == 0){
                    showMessage("Error", "Nothing found");
                    return;
                }
                StringBuffer buffer = new StringBuffer();
                while (res.moveToNext()){
                    buffer.append("NOQ:" + res.getString(0) + "\n");
                    buffer.append("SENTENCE:" + res.getString(1)+ "\n\n");
                }
                showMessage("Data", buffer.toString());
            }
        });}


    public void showMessage(String title, String Message){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setCancelable(true);
        builder.setTitle(title);
        builder.setMessage(Message);
        builder.show();
    }
    public void AddData(){
        SendData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               boolean isInserted =  database1.insertData(editNOH.getText().toString(), Hint.getText().toString());
                if(isInserted == true){
                    Toast.makeText(MainActivity.this,"Data Inserted", Toast.LENGTH_LONG).show();
                }
                else{
                    Toast.makeText(MainActivity.this,"Data not Inserted", Toast.LENGTH_LONG).show();
                }

            }
        });
    }
}

这是数据库代码：

public class database extends SQLiteOpenHelper {
    public static final String Name = "help_answer.db";
    public static final String tName = "hints_table";
    public static final String NOQ = "NOQ;
    public static final String helpSentence = "SENTENCE";

    public database(Context context) {
        super(context, Name, null, 1);
    }

 int a=0;//global
@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("CREATE TABLE " + tName + " (NOQ INTEGER PRIMARY KEY AUTOINCREMENT,, SENTENCE TEXT);");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + tName);
        onCreate(db);
    }
    public boolean insertData(String number, String helpS ){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues ContentValues = new ContentValues();
        ContentValues.put(NOQ,number);
        ContentValues.put(helpSentence, helpS);
        long result = db.insert(tName, null, ContentValues);
        if(result == -1){
            return false;
        }
        else{
            return true;
        }
    }
    public Cursor getData(){
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor res = db.rawQuery("select * from"+ tName, null);
        return res;
    }
}

这是logcat：

                                                         android.database.sqlite.SQLiteException: table hints_table has no column named SENTENCE (code 1): , while compiling: INSERT INTO hints_table(NQO,SENTENCE) VALUES (?,?)
                                                                              at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
                                                                              at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
                                                                              at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
                                                                              at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
                                                                              at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
                                                                              at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
                                                                              at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
                                                                              at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
                                                                              at com.example.ejhon.puzzlegame.database.insertData(database.java:33)
                                                                              at com.example.ejhon.puzzlegame.MainActivity$3.onClick(MainActivity.java:70)
                                                                              at android.view.View.performClick(View.java:5198)
                                                                              at android.view.View$PerformClick.run(View.java:21147)
                                                                              at android.os.Handler.handleCallback(Handler.java:739)
                                                                              at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                              at android.os.Looper.loop(Looper.java:148)
                                                                              at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                              at java.lang.reflect.Method.invoke(Native Method)
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

这是因为你没有在表名和表关键字之间留出空格。

这里，

tablehints_table

像这样更改代码，

 @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + tName + " (NUMBER_OF_QUESTION INTEGER PRIMARY KEY AUTOINCREMENT, SENTENCE TEXT)");
    }

并从表的列名中删除空格。

尝试以上代码。希望这会有所帮助。

Answer 2

在命令中添加空格。改变这个

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("create table" + tName + "(NUMBER OF QUESTION INTEGER PRIMARY KEY AUTOINCREMENT, SENTENCE TEXT)");
}

到这个

int i=0;//global    
@Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + tName + " ("+i+" INTEGER PRIMARY KEY AUTOINCREMENT,"+NOQ+" SENTENCE TEXT);");
    }

Android：无法在Sqllite数据库中写入数据

2 个答案: