java - 将数据插入SQLite数据库，数据类型不匹配

Question

我想使用 SQLite 将数据插入数据库，但我失败了。我按下了我创建的输入按钮，但数据无法发送到数据库中。我读过 LogCat，它说数据类型不匹配之类的内容，我不知道它意味着哪种数据类型。

这是我的代码:

数据库.java

public class database {

    public static final String MOVIE_NAME = "mName";

    private static final String DATABASE_NAME = "Movie";
    private static final String DATABASE_TABLE = "mList";
    private static final int DATABASE_VERSION = 1;

    private Database db;
    private final Context cont;
    private SQLiteDatabase moviedatabase;

    public static class Database extends SQLiteOpenHelper{

        public Database(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
            // TODO Auto-generated constructor stub
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                    MOVIE_NAME + " TEXT NOT NULL);"
            );
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
            db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME);
        }

    }

    public database(Context con){
        cont = con;
    }

    public database open() throws Exception{
        db = new Database(cont);
        moviedatabase = db.getWritableDatabase();
        return this;
    }
    public void close(){
        db.close();
    }

    public void createEntry(String input) {
        // TODO Auto-generated method stub
        ContentValues content = new ContentValues();
        content.put(MOVIE_NAME, input);
        moviedatabase.insert(DATABASE_TABLE, null, content);
    }

    public String getData() {
        // TODO Auto-generated method stub


        String[] col = new String[]{MOVIE_NAME};
        Cursor curs = moviedatabase.query(DATABASE_TABLE, col, null, null, null, null, null);
        String res = "";
        int rowNum = curs.getColumnIndex(MOVIE_NAME);

        for(curs.moveToFirst(); !curs.isAfterLast(); curs.moveToNext()){
            res = res + curs.getString(rowNum) + "\n";
        }

        return res;
    }

插入.java

public class insert extends Activity{

    Button insBtn;
    EditText insET;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.insert);

        insET = (EditText) findViewById(R.id.insertET);
        insBtn = (Button) findViewById(R.id.insertBtn);

        insBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                try{
                    String input = insET.getText().toString();

                    database newEntry = new database(insert.this);
                    newEntry.open();
                    newEntry.createEntry(input);
                    newEntry.close();
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        });
    }

列表.java

public class list extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list);

        TextView d = (TextView) findViewById(R.id.movieName);
        database movies = new database(this);

        try{
            movies.open();
            String data = movies.getData();
            movies.close();
            d.setText(data);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

}

日志猫:

03-16 07:28:17.617: E/SQLiteLog(3194): (20) statement aborts at 6: [INSERT INTO mList(mName) VALUES (?)] datatype mismatch
03-16 07:28:17.635: E/SQLiteDatabase(3194): Error inserting mName=dfsefsd
03-16 07:28:17.635: E/SQLiteDatabase(3194): android.database.sqlite.SQLiteDatatypeMismatchException: datatype mismatch (code 20)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at com.example.project.database.createEntry(database.java:63)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at com.example.project.insert$1.onClick(insert.java:34)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.view.View.performClick(View.java:4204)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.view.View$PerformClick.run(View.java:17355)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.os.Handler.handleCallback(Handler.java:725)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.os.Looper.loop(Looper.java:137)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at android.app.ActivityThread.main(ActivityThread.java:5041)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at java.lang.reflect.Method.invokeNative(Native Method)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at java.lang.reflect.Method.invoke(Method.java:511)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-16 07:28:17.635: E/SQLiteDatabase(3194):     at dalvik.system.NativeStart.main(Native Method)
03-16 07:28:26.418: I/Choreographer(3194): Skipped 33 frames!  The application may be doing too much work on its main thread.

Answer 1

首先开始更改代码

db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME);

至

db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);

很有可能这解释了数据类型错误。