android - Android 应用程序在调用 SQLiteHelper 时崩溃

Question

我一直在使用这个教程，但我不得不做一些小改动，我的应用程序在手机上崩溃了。但是，代码中没有错误！ http://www.vogella.com/articles/AndroidSQLite/article.html

public class SQLiteDbHelper extends SQLiteOpenHelper {
    public static final String TABLE_NAME = "table";
    public static final String COLUMN_NAME_SP = "SP";
    public static final String COLUMN_NAME_ST = "ST";

    // If you change the database schema, you must increment the database version.
    public static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "SPT.db";

    private static final String DATABASE_CREATE =
        "CREATE TABLE " + TABLE_NAME + 
         " (" +
        COLUMN_NAME_SP + " text not null" +
        COLUMN_NAME_ST + " text not null" +
        " )";

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

    @Override
    public void onCreate(SQLiteDatabase database) {
        database.execSQL(DATABASE_CREATE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
      Log.w(SQLiteDbHelper.class.getName(),
          "Upgrading database from version " + oldVersion + " to "
              + newVersion + ", which will destroy all old data");
      database.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
    }

}

然后，稍后，我有这个按钮单击方法的代码：

            public void Save(View view){
            String st = editTextSt.getText().toString();
            String sp = editTextSp.getText().toString();

       //this is what makes my app crash [beginning]
            SQLiteDbHelper database2 = new SQLiteDbHelper(this);
    SQLiteDatabase database = database2.getWritableDatabase();
       //this is what makes my app crash [end]

    ContentValues values = new ContentValues();
    values.put(SQLiteDbHelper.COLUMN_NAME_SP, sp);
    values.put(SQLiteDbHelper.COLUMN_NAME_ST, st);
    long insertId = database.insert(SQLiteDbHelper.TABLE_NAME, null, values);}

Answer 1

您忘记(,)在创建表查询中的每个列名后放置逗号，将其更改为：

private static final String DATABASE_CREATE =
        "CREATE TABLE " + TABLE_NAME + 
         " (" +
        COLUMN_NAME_SP + " text not null, " +
        COLUMN_NAME_ST + " text not null " +
        ");";