Question

我正在尝试将一些数据上传到SQLite数据库，但是当我单击“提交”时，我会不断收到“未插入数据”Toast消息。

我不确定为什么我的数据没有被正确传递？

DatabaseHelper.java：

public class DatabaseHelper extends SQLiteOpenHelper{

    public static final String DATABASE_NAME = "streaks.db"; // Name of DB
    public static final String TABLE_NAME = "streak_table";
    public static final String COL_1 = "ID";
    public static final String COL_2 = "STREAKNAME";
    public static final String COL_3 = "STREAKCATEGORY";
    public static final String COL_4 = "DATESTARTED";
    public static final String COL_5 = "DAYSKEPT";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, STREAKNAME TEXT, STREAKCATEGORY TEXT, DATESTARTED TEXT, DAYSKEPT INTEGER)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int i, int i1) {
        db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
        onCreate(db);
    }

    public boolean insertData(String STREAKNAME, String STREAKCATEGORY, String DATESTARTED, int DAYSKEPT){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL_2, STREAKNAME);
        contentValues.put(COL_3, STREAKCATEGORY);
        contentValues.put(COL_4, DATESTARTED);
        contentValues.put(COL_5, DAYSKEPT);
        long result = db.insert(TABLE_NAME,null,contentValues);
        if(result == -1){
            return false;
        } else return true;
    }
}

MainActivity.java的片段：

// Declaring variables from private variables above
db = new DatabaseHelper(MainActivity.this);

addStreakName = chooseName.getText().toString();
addCategory = prefs.getString("Category", "");
addToday = new SimpleDateFormat("dd-MM-yyyy").format(new Date());

if(prefs.getInt("todayOrChosen", 1) == 1){
    addStartedZero = 0;
    streakList.add(new Streak(addStreakName, addCategory, addToday, addStartedZero));
    boolean isInserted = db.insertData(addStreakName, addCategory, addToday, 0);
    if(isInserted){
        Toast.makeText(MainActivity.this, "Data Inserted", Toast.LENGTH_LONG).show();
    }
    else {
        Toast.makeText(MainActivity.this, "Data not Inserted", Toast.LENGTH_LONG).show();
    }
}

错误日志：

 08-04 17:46:41.409 22835-22835/? E/SQLiteLog: (20) statement aborts at 5: [INSERT INTO streak_table(STREAKNAME,STREAKCATEGORY,DAYSKEPT,DATESTARTED) VALUES (?,?,?,?)] datatype mismatch
08-04 17:46:41.410 22835-22835/? D/AndroidRuntime: Shutting down VM

08-04 17:46:41.413 22835-22835/? E/AndroidRuntime: FATAL EXCEPTION: main
                                               Process: carter.streakly, PID: 22835
                                               android.database.sqlite.SQLiteDatatypeMismatchException: datatype mismatch (code 20)
                                                   at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
                                                   at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:780)
                                                   at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
                                                   at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
                                                   at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1471)
                                                   at android.database.sqlite.SQLiteDatabase.insertOrThrow(SQLiteDatabase.java:1367)
                                                   at carter.streakly.DatabaseHelper.insertData(DatabaseHelper.java:43)
                                                   at carter.streakly.MainActivity$11.onClick(MainActivity.java:301)
                                                   at android.view.View.performClick(View.java:5198)
                                                   at android.view.View$PerformClick.run(View.java:21147)
                                                   at android.os.Handler.handleCallback(Handler.java:739)
                                                   at android.os.Handler.dispatchMessage(Handler.java:95)
                                                   at android.os.Looper.loop(Looper.java:148)
                                                   at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

我刚刚运行了你的代码，创建了可以正常使用的表格。

您可能已经编辑了其中一列的类型，但表格尚未更新。尝试删除应用程序的数据或卸载它一次并重新构建它。

Answer 2

哦发现错误。在您创建表的execSQL方法中，您忘记添加＆＃39 ;;＆＃39; E.G。

db.execSQL("create table " + 
             TABLE_NAME + 
            " (ID INTEGER PRIMARY KEY AUTOINCREMENT, 
               STREAKNAME TEXT,
               STREAKCATEGORY TEXT,  
               DATESTARTED TEXT, 
               DAYSKEPT INTEGER);"); //right here add the semicolon

将数据插入SQLite

2 个答案: