唯一约束失败:sqlite 数据库:android [英] UNIQUE constraint failed: sqlite database : android

问题描述

我正在尝试在表中插入值.但是只插入了一个值.当我尝试插入新值时，在 log cat 中出现错误.

I am trying to insert values in table. But there is only one value inserted. I am getting an error in log cat when I am trying to insert new values.

日志猫显示:

abort at 13 in [INSERT INTO event(totalminutesfrom,dayofweek,title,location,totalminutesto,id) VALUES (?,?,?,?,?,?)]: UNIQUE constraint failed: event.id
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: Error inserting totalminutesfrom=694 dayofweek=null title=qxs location=Eded & Mariz totalminutesto=0 id=0
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: event.id (code 1555)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:782)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1471)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.EventTableHelper.addEvent(EventTableHelper.java:76)
01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.AddEventActivity$5.onClick(AddEventActivity.java:217)

插入行时这两行显示错误.

Its showing error on these two lines while inserting row.

db.insert(TABLE, null, values);

   db.addEvent(new EventData(eventTitle,dayOfWeek,totalMinutesFrom, totalMinutesTo,location));

EventTableHelper

EventTableHelper

public class EventTableHelper extends SQLiteOpenHelper {


    private static final String TABLE = "event";
    private static final String KEY_ID = "id";
    private static final String KEY_TITLE = "title";
    private static final String KEY_LOCATION = "location";
    private static final String KEY_DAY_OF_WEEK = "dayofweek";
    private static final String KEY_TOTAL_MINUTES_FROM = "totalminutesfrom";
    private static final String KEY_TOTAL_MINUTES_TO = "totalminutesto";



    public EventTableHelper(Context context) {
        super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
        //3rd argument to be passed is CursorFactory instance
    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        //createTable(db);
    }

    public void createTable(SQLiteDatabase db){
        String CREATE_EVENTS_TABLE = "CREATE TABLE " + TABLE + "("
                + KEY_ID + " INTEGER PRIMARY KEY," + KEY_TITLE + " TEXT,"
                + KEY_DAY_OF_WEEK +"TEXT" + KEY_TOTAL_MINUTES_FROM +"INTEGER"
                + KEY_TOTAL_MINUTES_TO + "INTEGER" +  KEY_LOCATION + "TEXT" +  ")";

        db.execSQL(CREATE_EVENTS_TABLE);

    }
    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
       // db.execSQL("DROP TABLE IF EXISTS " + TABLE);

      //  createTable(db);

        // Create tables again
        //onCreate(db);
    }

    // code to add the new contact
    public void addEvent(EventData event) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_ID, event.getId());
        values.put(KEY_TITLE,event.getTitle()); // Contact Name
        values.put(KEY_DAY_OF_WEEK,event.getDayofWeek());
        values.put(KEY_TOTAL_MINUTES_FROM,event.getFromMinutes());
        values.put(KEY_TOTAL_MINUTES_TO,event.getToMinutes());
        values.put(KEY_LOCATION,event.getLocation());
        // Inserting Row
        db.insert(TABLE, null, values);
        //2nd argument is String containing nullColumnHack
        db.close(); // Closing database connection
    }

    // code to get the single contact
   EventData getEvent(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE, new String[] { KEY_ID,
                        KEY_TITLE, KEY_DAY_OF_WEEK, KEY_TOTAL_MINUTES_FROM,KEY_TOTAL_MINUTES_TO,KEY_LOCATION }, KEY_ID + "=?",
                new String[] { String.valueOf(id) }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();
       EventData eventData = new EventData(Integer.parseInt(cursor.getString(0)),cursor.getString(1), cursor.getString(2),
               cursor.getInt(3),cursor.getInt(4),cursor.getString(5));

        return eventData;
    }



    // code to get all contacts in a list view
    public List<EventData> getAllEvents() {
        List<EventData> conList = new ArrayList<EventData>();
        // Select All Query
        String selectQuery = "SELECT  * FROM " + TABLE;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {

                EventData event = new EventData();

                event.setId(Integer.parseInt(cursor.getString(0)));
                event.setTitle(cursor.getString(1));
                event.setDayofWeek(cursor.getString(2));
                event.setFromMinutes(cursor.getInt(3));
                event.setToMinutes(cursor.getInt(4));
                event.setLocation(cursor.getString(5));
                // Adding contact to list
                conList.add(event);
            } while (cursor.moveToNext());
        }

        // return contact list
        return conList;
    }
}

如何解决这个问题??

推荐答案

您的代码可能违反了 KEY_ID 字段的主键唯一性约束.

Your code probably violates primary key's uniqueness constraint on a KEY_ID field.

两种可能的解决方案是:

Two possible solutions are:

1. 确保您的 EventData.getId() 为每个对象返回唯一值.目前，我没有看到您将任何标识符传递给其构造函数，而且可能所有事件都使用相同的 id 值插入.
2. 如果您不关心自己生成 id，您可以将 AUTOINCREMENT 设置添加到您的 KEY_ID 列定义中.这样 KEY_ID 字段将自动填充，每一行都有自己的唯一值.到达那里后，不要忘记自己将 KEY_ID 添加到 ContentValues.

1. Make sure that your EventData.getId() returns unique values per object. For now, I don't see you pass any identifier to its constructor and perhaps all the events are inserted with the same id value.
2. If you don't care about generating ids by yourself, you can add AUTOINCREMENT setting to your KEY_ID column definition. This way KEY_ID field will be filled automatically and each row will have its own, unique value. Once there, don't forget to remove adding KEY_ID to ContentValues by yourself.

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