Question

我在编码方面很新，所以我复制粘贴一些教程的代码，但是当我试图删除“sleep”列中的所有数据时，显示此错误。

android.database.sqlite.SQLiteException：near“20170128”：语法错误（代码1）:,编译时：DELETE FROM 20170128 在android.database.sqlite.SQLiteConnection.nativePrepareStatement（Native 方法）在android.database.sqlite.SQLiteConnection.acquirePreparedStatement（SQLiteConnection.java:889）在android.database.sqlite.SQLiteConnection.prepare（SQLiteConnection.java:500）在android.database.sqlite.SQLiteSession.prepare（SQLiteSession.java:588）在android.database.sqlite.SQLiteProgram。（SQLiteProgram.java:58）在android.database.sqlite.SQLiteStatement。（SQLiteStatement.java:31）在android.database.sqlite.SQLiteDatabase.delete（SQLiteDatabase.java:1496）在jm.myapplication.Sleep.sleep_repo.delete1（sleep_repo.java:51）在jm.myapplication.Main.MainActivity $ 1.onClick（MainActivity.java:220）在android.view.View.performClick（View.java:4780）在android.view.View $ PerformClick.run（View.java:19866）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:135）在android.app.ActivityThread.main（ActivityThread.java:5254） at java.lang.reflect.Method.invoke（Native Method）在java.lang.reflect.Method.invoke（Method.java:372）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:903）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:698）

这是我的代码。

这是我的主要活动

public void onClick(View v) {
                final Integer newSleep = sleep;
                    sleep_repo repo = new sleep_repo(MainActivity.this);
                    others sleep = new others();

                     sleep.sleep = Recent_f_id;
                     sleep.sleep=newSleep;

    repo.delete1(sleep);

    Recent_f_id = repo.insert(sleep);

    Toast.makeText(getApplicationContext(),
            newSleep + " has been added", Toast.LENGTH_LONG)
            .show();
    d.dismiss();
 }

虽然这是我的sleep_repo.java

public void delete1(others sleep) {

        // db.delete(String tableName, String whereClause, String[] whereArgs);
        // If whereClause is null, it will delete all rows.
        SQLiteDatabase db = dbHelper.getWritableDatabase(); // helper is object extends SQLiteOpenHelper
        db.delete(getDateTime(),null,null);
        /*db.delete(getDateTime(),others.KEY_ID+"=?",new String[] { String.valueOf(sleep) });*/
        db.close(); // Closing database connection
    }

虽然这是我的others.java

public class others {

    // Labels table name
    public static final String TABLE = "others";

    // Labels Table Columns names
    public static final String KEY_ID = "id";
    public static final String KEY_sleep = "sleep";
    public static final String KEY_smoke = "smoke";
    public static final String KEY_exercise = "exercise";





    // property help us to keep data
    public int Recent_f_id;
    public Integer id;
    public Integer sleep;
    public Integer smoke;
    public String exercise;


}

这是我的Dates.java

public class Dates extends SQLiteOpenHelper {
    //version number to upgrade database version
    //each time if you Add, Edit table, you need to change the
    //version number.
    private static final int DATABASE_VERSION = 4;



    public static String getDateTime() {
        SimpleDateFormat dateFormat = new SimpleDateFormat(
                "yyyyMMdd", Locale.getDefault());
        Date date = new Date();
        return dateFormat.format(date);
    }

    // Database Name
    private static final String DATABASE_NAME = getDateTime();

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


    @Override
    public void onCreate(SQLiteDatabase db) {
        //All necessary tables you like to create will create here

        String CREATE_TABLE_meals = "CREATE TABLE " + meals.TABLE  + "("
                + meals.KEY_breakfast + " TEXT, "
                + meals.KEY_lunch + " TEXT, "
                + meals.KEY_dinner + " TEXT, "
                + meals.KEY_other   + " TEXT )";

        String CREATE_TABLE_drinks = "CREATE TABLE " + drinks.TABLE  + "("
                + drinks.KEY_alcoholic + " TEXT, "
                + drinks.KEY_water  + " INTEGER )";

        String CREATE_TABLE_others = "CREATE TABLE " + others.TABLE  + "("
                + others.KEY_ID  + " INTEGER PRIMARY KEY AUTOINCREMENT ,"
                + others.KEY_sleep + " TEXT, "
                + others.KEY_smoke + " INTEGER, "
                + others.KEY_exercise   + " INTEGER )";

        db.execSQL(CREATE_TABLE_meals);
        db.execSQL(CREATE_TABLE_drinks);
        db.execSQL(CREATE_TABLE_others);

    }

Answer 1

20170128不是有效的表名。（除非用方括号或引号括起来，否则表名不能以数字开头）。

在sqlite数据库中删除时出错

1 个答案: