Question

我创建了一个数据库应用程序，允许用户搜索电影数据库。我的理解是，当点击搜索按钮时，它应该调用搜索方法来检查数据库条目并返回与搜索词匹配的条目，但是点击按钮会使应用程序崩溃，任何帮助和解释都将不胜感激。确认正在创建数据库也很棒，谢谢

主要活动

    public class MainActivity extends ActionBarActivity {
        public final static String FILM = "com.mnt.filmapp6.FILM";
        protected SQLiteDatabase db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btnAddFilm = (Button) findViewById(R.id.add_film);
        Button btnFavourite = (Button) findViewById(R.id.favourites);

        btnAddFilm.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), MainActivity2.class);
                startActivity(intent);
            }
        });

        btnFavourite.setOnClickListener(new View.OnClickListener() {

                                            @Override
                                            public void onClick(View v) {
                                                Intent intent = new Intent(getApplicationContext(), MainActivity3.class);
                                                startActivity(intent);
                                            }
                                        }
        );
    }

    public void search(View v){
        EditText edtSearch = (EditText)findViewById(R.id.edtSearch);
        String search = "%" + edtSearch.getText().toString() + "%";
        db = new DbHelper(this).getReadableDatabase();
        String[] tblColumns = {"*"};
        String where = "film LIKE ? OR actor LIKE ? OR actor2 LIKE ? OR director LIKE ?";
        String[] whereArgs = {search, search, search, search};
        Cursor results = db.query("FILMTABLE", tblColumns, where, whereArgs, null, null, null);
        films(results);
    }

    public void films (Cursor c){

        int titleIndex = c.getColumnIndex("film");
        int directorIndex = c.getColumnIndex("director");
        int idIndex = c.getColumnIndex("id");
        String title = c.getString(titleIndex);
        String director = c.getString(directorIndex);
        int filmID = c.getInt(idIndex);

        TextView txt = new TextView(getApplicationContext());
        txt.setId(filmID);
        txt.setText(title + ", " + director);
        txt.setTextColor(Color.BLACK);
        txt.setTextSize(15);
        //txt.setText(ScrollView);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Dbhelper

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +
        ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                  FILM + "TEXT NOT NULL, " +
                        ACTOR + "TEXT NOT NULL, " +
                        ACTOR2 + "TEXT NOT NULL, " +
                        DIRECTOR + "TEXT NOT NULL, " +
                        DESCRIPTION + "TEXT NOT NULL);"
        );

        Cursor countRows = db.rawQuery("SELECT count(*) FROM FILMTABLE", null);
        countRows.moveToFirst();
        int NumRows = countRows.getInt(0);
        countRows.close();

        if (NumRows == 0) {
            ContentValues values = new ContentValues();

            values.put("film", "Wolf of Wall Street");
            values.put("actor", "Leonardo Dicaprio");
            values.put("actor2", "Jonah Hill");
            values.put("director", "Martin Scorses");
            values.put("description", "True story of New York stockbroker Jordan Belfort. From the American dream to corporate greed, Belfort goes from penny stocks and righteousness to IPOs and a life of corruption in the late 80's.");
            db.insert("FILMTABLE", null, values);
            values.clear();

            values.put("film", "Captain Philips");
            values.put("actor", "Tom Hanks");
            values.put("actor2", "Catherine Keener");
            values.put("director", "Paul Greengrass");
            values.put("description", "True story, Captain Phillips is a multi-layered examination of the 2009 hijacking of the U.S. container ship Maersk Alabama by a crew of Samali pirates.");
            db.insert("FILMTABLE", null, values);
            values.clear();

        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);
        onCreate(db);
    }
}

主要活动xml

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<TextView android:text="@string/film_app" android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:id="@+id/textView" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/search"
    android:id="@+id/search"
    android:layout_below="@+id/edtSearch"
    android:layout_centerHorizontal="true"
    android:onClick="search"/>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/add_film"
    android:id="@+id/add_film"
    android:layout_below="@+id/favourites"
    android:layout_alignLeft="@+id/search"
    android:layout_alignStart="@+id/search"
    android:onClick="add"/>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/favourites"
    android:id="@+id/favourites"
    android:layout_below="@+id/search"
    android:layout_centerHorizontal="true"
    android:onClick="favourite"/>

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/edtSearch"
    android:hint="Enter Film/Actor/Director"
    android:layout_below="@+id/textView"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="34dp" />

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true">

    <LinearLayout
        android:id="@+id/resultLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    </LinearLayout>
</ScrollView>

logcat的

03-04 12:16:53.829    1879-1879/com.mnt.filmapp6 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.mnt.filmapp6, PID: 1879
java.lang.IllegalStateException: Could not execute method of the activity
        at android.view.View$1.onClick(View.java:4007)
        at android.view.View.performClick(View.java:4756)
        at android.view.View$PerformClick.run(View.java:19749)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        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: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            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: no such column: film (code 1): , while compiling: SELECT * FROM FILMTABLE WHERE film LIKE ? OR actor LIKE ? OR actor2 LIKE ? OR director LIKE ?
        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.mnt.filmapp6.MainActivity.search(MainActivity.java:58)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            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)

Answer 1

错误在于：

 db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +
 ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
          FILM + "TEXT NOT NULL, " +
                ACTOR + "TEXT NOT NULL, " +
                ACTOR2 + "TEXT NOT NULL, " +
                DIRECTOR + "TEXT NOT NULL, " +
                DESCRIPTION + "TEXT NOT NULL);"
);

应该是这样的：

db.execSQL("CREATE TABLE " + TABLE_NAME + " (" +
ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
          FILM + " TEXT NOT NULL, " +
                ACTOR + " TEXT NOT NULL, " +
                ACTOR2 + " TEXT NOT NULL, " +
                DIRECTOR + " TEXT NOT NULL, " +
                DESCRIPTION + " TEXT NOT NULL);"
);

Answer 2

引起：android.database.sqlite.SQLiteException：没有这样的列：电影（代码1）:,同时编译：SELECT * FROM FILMTABLE WHERE电影喜欢？或演员喜欢？还是演员2喜欢？或导演LIKE？

检查FILMTABLE列的数据库表film。我认为数据库表或SQL语法中没有film列是错误的。

尝试使用任何客户端首先在数据库上运行查询，然后在项目中使用它。

Answer 3

Caused by: android.database.sqlite.SQLiteException: no such column: film (code 1): , while compiling: SELECT * FROM FILMTABLE WHERE film LIKE ? OR actor LIKE ? OR actor2 LIKE ? OR director LIKE ?

检查film列的表和SQL语法。

在Stack Overflow中发布之前，请对Logs进行详细分析。

单击按钮时，应用程序数据库崩溃

3 个答案: