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我正在创建一个活动来获取用户名密码并注册它们我在会员注册活动中遇到了 sqlite 异常问题有人可以指出我在下面的代码中做错了什么吗？发布更新的 LOGCAT

DBHelper 活动

公共类 DBHelper 扩展 SQLiteOpenHelper {

private static final String DATABASE_NAME = "membersdb";
private static final String DATABASE_TABLE = "members"; // this is your
                                                        // table name
private static final String KEY_ROW_ID = "_id";
private static final String KEY_USERNAME = "username";
private static final String KEY_PASSWORD = "password";
private static final String KEY_FULLNAME = "fullname";
private static final String KEY_EMAILS = "email";

private static final int DATABASE_VERSION = 1;

private static final String DATABASE_CREATE = "CREATE TABLE "
        + DATABASE_TABLE + " (" + KEY_ROW_ID
        + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_USERNAME
        + " TEXT NOT NULL , " + KEY_PASSWORD + " TEXT NOT NULL , "
        + KEY_FULLNAME + " TEXT NOT NULL , " + KEY_EMAILS
        + " TEXT NOT NULL);";

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

}

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

}

@Override
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
    db.execSQL("DROP TABLE IF EXISTS members");
    onCreate(db);

}

}

DBAdapter 活动

public class DBAdapter {
    private static final String DATABASE_TABLE = "members";
    public static final String KEY_ROW_ID = "_id";
    public static final String KEY_USERNAME = "username";
    public static final String KEY_PASSWORD = "password";
    public static final String KEY_FULLNAME = "fullname";
    public static final String KEY_EMAILS = "emails";

    SQLiteDatabase mDb;
    Context mCtx;
    DBHelper mDbHelper;

    public DBAdapter(Context context) {
        this.mCtx = context;
    }

    public DBAdapter open() throws SQLException {
        mDbHelper = new DBHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        mDbHelper.close();
    }

    public long register(String user, String pw, String name, String email) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_USERNAME, user);
        initialValues.put(KEY_PASSWORD, pw);
        initialValues.put(KEY_FULLNAME, name);
        initialValues.put(KEY_EMAILS, email);

        return mDb.insert(DATABASE_TABLE, null, initialValues);
    }

    public boolean Login(String username, String password) throws SQLException {
        Cursor mCursor = mDb.rawQuery("SELECT * FROM " + DATABASE_TABLE
                + " WHERE username=? AND password=?", new String[] { username,
                password });
        if (mCursor != null) {
            if (mCursor.getCount() > 0) {
                return true;
            }
        }
        return false;
    }
}

调用 DBadapter 的主要活动

public class MembersActivity extends Activity {
    DBAdapter dbAdapter;
    EditText txtUserName;
    EditText txtPassword;
    Button btnLogin;
    Button btnRegister;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        txtUserName = (EditText) findViewById(R.id.et_user);
        txtPassword = (EditText) findViewById(R.id.et_pw);
        btnLogin = (Button) findViewById(R.id.btn_login);
        btnRegister = (Button) findViewById(R.id.btn_reg);

        dbAdapter = new DBAdapter(this);
        dbAdapter.open();

        btnLogin.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(txtUserName.getWindowToken(), 0);
                imm.hideSoftInputFromWindow(txtPassword.getWindowToken(), 0);
                String username = txtUserName.getText().toString();
                String password = txtPassword.getText().toString();
                if (username.length() > 0 && password.length() > 0) {
                    try {

                        if (dbAdapter.Login(username, password)) {
                            Toast.makeText(MembersActivity.this,
                                    "Successfully Logged In", Toast.LENGTH_LONG)
                                    .show();
                        } else {
                            Toast.makeText(MembersActivity.this,
                                    "Invalid username or password",
                                    Toast.LENGTH_LONG).show();
                        }

                    } catch (Exception e) {
                        Toast.makeText(MembersActivity.this,
                                "Some problem occurred", Toast.LENGTH_LONG)
                                .show();

                    }
                } else {
                    Toast.makeText(MembersActivity.this,
                            "Username or Password is empty", Toast.LENGTH_LONG)
                            .show();
                }
            }
        });

        btnRegister.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent opencont = new Intent("com.ideals.ideal.MEMBERSREGISTER");
                startActivity(opencont);
            }
        });
    }
}

日志猫

09-29 21:46:07.577: I/Database(555): sqlite returned: error code = 1, msg = table members has no column named emails
09-29 21:46:07.587: E/Database(555): Error inserting username=hello emails=hello password=hello fullname=hello
09-29 21:46:07.587: E/Database(555): android.database.sqlite.SQLiteException: table members has no column named emails: , while compiling: INSERT INTO members(username, emails, password, fullname) VALUES(?, ?, ?, ?);
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:41)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1149)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1569)
09-29 21:46:07.587: E/Database(555):    at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1426)
09-29 21:46:07.587: E/Database(555):    at com.ideals.ideal.DBAdapter.register(DBAdapter.java:42)
09-29 21:46:07.587: E/Database(555):    at com.ideals.ideal.MembersRegister$1.onClick(MembersRegister.java:50)
09-29 21:46:07.587: E/Database(555):    at android.view.View.performClick(View.java:2485)
09-29 21:46:07.587: E/Database(555):    at android.view.View$PerformClick.run(View.java:9080)
09-29 21:46:07.587: E/Database(555):    at android.os.Handler.handleCallback(Handler.java:587)
09-29 21:46:07.587: E/Database(555):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-29 21:46:07.587: E/Database(555):    at android.os.Looper.loop(Looper.java:123)
09-29 21:46:07.587: E/Database(555):    at android.app.ActivityThread.main(ActivityThread.java:3683)
09-29 21:46:07.587: E/Database(555):    at java.lang.reflect.Method.invokeNative(Native Method)
09-29 21:46:07.587: E/Database(555):    at java.lang.reflect.Method.invoke(Method.java:507)
09-29 21:46:07.587: E/Database(555):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
09-29 21:46:07.587: E/Database(555):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
09-29 21:46:07.587: E/Database(555):    at dalvik.system.NativeStart.main(Native Method)
4

3 回答 3

1

有这些

private static final String DATABASE_TABLE = "members"; // this is your table name
private static final String KEY_ROW_ID = "_id"; 
private static final String KEY_USERNAME = "username";
private static final String KEY_PASSWORD = "password";

在DBHelper

然后你的查询应该是这样的

private static final String DATABASE_CREATE =  "CREATE TABLE " + DATABASE_TABLE + " (" 
            + KEY_ROW_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_USERNAME + " TEXT NOT NULL , " +
            KEY_PASSWORD + " TEXT NOT NULL );";
于 2013-09-29T15:22:37.550 回答
1

看来您缺少表名，请尝试如下：

public class DBHelper extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "membersdb";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE = "CREATE TABLE members (_id integer primary key autoincrement, username text not null, password text not null);";

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

}

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

}

@Override
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
    db.execSQL("DROP TABLE IF EXISTS members");
    onCreate(db);

  }  
}
于 2013-09-29T15:20:18.683 回答
1

你没有提到表名。logcat 也专注于：

 09-29 20:17:09.747: E/AndroidRuntime(372): Caused by: android.database.sqlite.SQLiteException: near "(": syntax error: CREATE TABLE  (_id integer primary key autoincrement,username text not null,password text not null);

所以指定表名。

于 2013-09-29T15:27:00.307 回答