Question

这个问题已经回答很多次但仍然无法找到我的错误。我正在创建一个数据库和一个表，以便在SQLite数据库中插入一些值。但它显示了SQLite Exception。

这是我尝试过的代码。

主要活动：

当我点击Register按钮时，它应该创建数据库，表格，然后将数据输入表格。

private static final int DATABASE_VERSION = 2;
private static final String DATABASE_NAME = "userDB";
private static final String TABLE_USER = "users";

private static final String KEY_ID = "id";
private static final String KEY_USERNAME = "username";
private static final String KEY_PASSWORD = "password";

db = new DataBaseHandler(RegisterActivity.this); // my database handler

    username = (EditText) findViewById(R.id.usernameRegister);
    password = (EditText) findViewById(R.id.passwordRegister);
    registerSave = (Button) findViewById(R.id.saveRegister);

    registerSave.setOnClickListener(new View.OnClickListener() {

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

            usernameInput = username.getText().toString();
            passwordInput = password.getText().toString();

            //createDB();
            Log.d("Insert: ", "Inserting ..");
            db.addUsers(new Users(""+usernameInput,""+passwordInput));
        //  db.addUsers(new Users("password",passwordInput));

            Log.d("inserted", ""+db);

            Log.d("inputs", "" + usernameInput + ":" + passwordInput);

        }
    });

这是我的数据库处理程序类

public DataBaseHandler(Context context) {

    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    String CREATE_USER_TABLE = "CREATE TABLE IF NOT EXISTS "+TABLE_USER+" (" + KEY_ID
            + "INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_USERNAME + " TEXT,"
            + KEY_PASSWORD + " TEXT" + ")";
    db.execSQL(CREATE_USER_TABLE);
    Log.d("sqlite DB:","Created"+db.toString());

}

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

// Adding new contact
void addUsers(Users users) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_USERNAME, users.getUsername()); // User Name
    values.put(KEY_PASSWORD, users.getPassword()); // Password

    // Inserting Row
    db.insert(TABLE_USER, null, values);
    db.close(); // Closing database connection
}

Users getUser(int id) {
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_USER, new String[] { KEY_ID,
            KEY_USERNAME, KEY_PASSWORD }, KEY_ID + "=?",
            new String[] { String.valueOf(id) }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    Users users = new Users(Integer.parseInt(cursor.getString(0)),
            cursor.getString(1), cursor.getString(2));
    // return contact
    return users;
}

这是获取用户数据的用户类。

public class Users {

int _id;
String _username;
String _password;

public Users() {

}

public Users(int id, String username, String password) {
    this._id = id;
    this._username = username;
    this._password = password;
}

public Users(String username, String password) {
    this._username = username;
    this._password = password;
}

public int getId() {
    return this._id;
}

public void setId(int id) {
    this._id = id;
}

public String getUsername() {
    return this._username;
}

public void setUsername(String username) {
    this._username = username;
}

public String getPassword() {
    return this._password;
}

public void setPassword(String password) {
    this._password = password;
}

}

我也发布了输出的logcat：

Logcat：

01-07 07:38:19.613: E/SQLiteDatabase(3467): Error inserting username=sagar password=asdfg
01-07 07:38:19.613: E/SQLiteDatabase(3467): android.database.sqlite.SQLiteException: no such table: users (code 1): , while compiling: INSERT INTO users(username,password) VALUES (?,?)
01-07 07:38:19.613: E/SQLiteDatabase(3467):     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
`

我很震惊。需要一些帮助。

Answer 1

您WHITE SPACE部分中的CREATE TABLE IF NOT EXISTS受到了影响。

您可以使用这个

String CREATE_USER_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_USER + "("
            + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_USERNAME + " TEXT, " + KEY_PASSWORD + " TEXT )";

卸载＆amp;运行您的应用。快乐编码。

Answer 2

尝试此查询

String CREATE_USERS_TABLE= java.lang.String.format("CREATE TABLE IF NOT EXISTS %s (%s INTEGER PRIMARY KEY AUTOINCREMENT, %s TEXT, %s TEXT);", TABLE_USER,KEY_ID, KEY_USERNAME,KEY_PASSWORD);

Answer 3

首先，在创建表查询中搜索缺少的空格：

String CREATE_USER_TABLE = "CREATE TABLE IF NOT EXISTS "+TABLE_USER+" (" + KEY_ID
        + "INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_USERNAME + " TEXT,"
        + KEY_PASSWORD + " TEXT" + ")";

也许您在KEY_ID和INTEGER PRIMARY KEY AUTOINCREMENT,...之间找不到空格。您必须增加数据库版本才能再次调用public void onCreate(SQLiteDatabase db)。

您可以记录您的数据库创建sql并在控制台中自己尝试。

无法将数据插入到android

3 个答案: