Question

我正在开发一个费用跟踪器，我想在应用程序首次启动时用一些记录填充数据库。我试图在我的splash活动中调用该方法并添加数据。但是当我清除我的应用程序数据并第一次启动应用程序时，会发生错误，说没有这样的列。

日志cat错误如下所示。

06-30 18:09:58.834: E/SQLiteLog(18380): (1) no such column: exp_type
06-30 18:10:00.826: D/AndroidRuntime(18380): Shutting down VM
06-30 18:10:00.826: W/dalvikvm(18380): threadid=1: thread exiting with uncaught exception (group=0x416b8318)
06-30 18:10:00.856: E/AndroidRuntime(18380): FATAL EXCEPTION: main
06-30 18:10:00.856: E/AndroidRuntime(18380): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sliit.expenseanalyzer/com.sliit.expenseanalyzer.SplashActivity}: android.database.sqlite.SQLiteException: no such column: exp_type (code 1): , while compiling: SELECT * FROM expense_type Order BY exp_type DESC
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2063)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2088)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread.access$600(ActivityThread.java:134)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.os.Looper.loop(Looper.java:137)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread.main(ActivityThread.java:4744)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at java.lang.reflect.Method.invokeNative(Native Method)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at java.lang.reflect.Method.invoke(Method.java:511)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at dalvik.system.NativeStart.main(Native Method)
06-30 18:10:00.856: E/AndroidRuntime(18380): Caused by: android.database.sqlite.SQLiteException: no such column: exp_type (code 1): , while compiling: SELECT * FROM expense_type Order BY exp_type DESC
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1200)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at com.sliit.expenseanalyzer.util.DatabaseHandler.getAllExpenseTypes(DatabaseHandler.java:218)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at com.sliit.expenseanalyzer.SplashActivity.onCreate(SplashActivity.java:29)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.Activity.performCreate(Activity.java:5008)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
06-30 18:10:00.856: E/AndroidRuntime(18380):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2027)
06-30 18:10:00.856: E/AndroidRuntime(18380):    ... 11 more

第一次启动应用程序时，如何填充数据！它只有少数记录，所以我不担心性能。

这将是一个很大的帮助！

谢谢。

数据库代码

public void onCreate(SQLiteDatabase db) {

        // Create user table
        String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "(" + KEY_ID
                + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_NAME + " TEXT,"
                + KEY_EMAIL + " TEXT," + KEY_PW + " TEXT," + KEY_SESSION
                + " INTEGER" + ")";

        String CREATE_EXPENSE_TYPE_TABLE = "CREATE TABLE " + TABLE_EXPENSE_TYPE
                + " (" + KEY_EXPENSE_ID + " INTEGER AUTOINCREMENT" + KEY_EXPENSE_TYPE + " TEXT PRIMARY KEY" + ")";

        db.execSQL(CREATE_USER_TABLE);
        db.execSQL(CREATE_EXPENSE_TYPE_TABLE);
    }

我用来添加记录的方法

public Long addExpenseType(String expense) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_EXPENSE_TYPE, expense);

        Long row = db.insert(TABLE_EXPENSE_TYPE, null, values);
        db.close();

        return row;
    }

字符串值：

    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "expenseManager";

    // Database Tables
    private static final String TABLE_USER = "user";
    private static final String TABLE_EXPENSE_TYPE = "expense_type";

    // User table columns
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "full_name";
    private static final String KEY_PW = "password";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_SESSION = "session";

    // Expense type table columns
    private static final String KEY_EXPENSE_ID = "id";
    private static final String KEY_EXPENSE_TYPE = "exp_type";

Answer 1

养成很好地格式化代码的习惯。最后一列定义没有逗号：

    String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER 
            + "(" 
            + KEY_ID      + " INTEGER PRIMARY KEY AUTOINCREMENT, " 
            + KEY_NAME    + " TEXT, "
            + KEY_EMAIL   + " TEXT, " 
            + KEY_PW      + " TEXT, "
            + KEY_SESSION + " INTEGER "
            + ")";

    String CREATE_EXPENSE_TYPE_TABLE = "CREATE TABLE " + TABLE_EXPENSE_TYPE
            + "(" 
            + KEY_EXPENSE_ID   + " INTEGER AUTOINCREMENT, "
            + KEY_EXPENSE_TYPE + " TEXT PRIMARY KEY "
            + ")";

Answer 2

android.database.sqlite.SQLiteException：没有这样的列：exp_type （代码1）:,编译时：SELECT * FROM expense_type Order BY exp_type DESC

这是你的错误：

String CREATE_EXPENSE_TYPE_TABLE = "CREATE TABLE " + TABLE_EXPENSE_TYPE
                + " (" + KEY_EXPENSE_ID + " INTEGER AUTOINCREMENT" +  
   KEY_EXPENSE_TYPE + " TEXT PRIMARY KEY" + ")

INTEGER AUTOINCREMENT

后需要一个空格

KEY_EXPENSE_ID + " INTEGER AUTOINCREMENT" +  
       KEY_EXPENSE_TYPE

评估为：

“id integer autoincrementexp_type”

Answer 3

尝试在user preferences / shared preferences中添加一个标记来检查首次运行的应用，然后在返回时，您可以决定是要创建数据库还是阅读它！你看看http://www.vogella.com/articles/AndroidSQLite/article.html
编辑
或者只是检查是否有dbexists而不是用户pref标志

Answer 4

private final String SAMPLE_DB_NAME = "TheftData";
    private final String SAMPLE_TABLE_NAME = "UserDetails";
    String CreateTable = "CREATE TABLE IF NOT EXISTS " +
            SAMPLE_TABLE_NAME +
            " (Username VARCHAR, Password VARCHAR," +                   
            " );";

然后在onCreate

protected void onCreate(Bundle savedInstanceState) {
try {
        sampleDB =  this.openOrCreateDatabase(SAMPLE_DB_NAME, MODE_PRIVATE, null);

        sampleDB.execSQL(CreateTable);
        sampleDB.close();
        }

    catch(Exception e)
    {Toast.makeText(getApplicationContext(), " Error: "+e.getMessage(), Toast.LENGTH_LONG).show();
    sampleDB.close();
    }

并添加数据

 public void insertData(String username,String password)
    {

        sampleDB =  this.openOrCreateDatabase(SAMPLE_DB_NAME, MODE_PRIVATE, null);

        sampleDB.execSQL(CreateTable);
        sampleDB.execSQL("INSERT INTO " +
                SAMPLE_TABLE_NAME +
                " Values ('"+username+"','"+ password+"');");
        sampleDB.close();

    }

将初始数据插入sqlite android

4 个答案: