java – UNIQUE约束失败：sqlite数据库：android
作者：互联网
我想在表中插入值.但是只插入了一个值.当我尝试插入新值时,我在log cat中收到错误.
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)
它在插入行时显示这两行的错误.
db.insert(TABLE, null, values);
db.addEvent(new EventData(eventTitle,dayOfWeek,totalMinutesFrom, totalMinutesTo,location));
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;
}
}
怎么解决这个？
解决方法:
您的代码可能违反了KEY_ID字段上的主键唯一性约束.
两种可能的解决方案是
>确保EventData.getId()返回每个对象的唯一值.现在,我没有看到你将任何标识符传递给它的构造函数,也许所有事件都插入了相同的id值.
>如果您不关心自己生成ID,可以将AUTOINCREMENT设置添加到KEY_ID列定义中.这样,KEY_ID字段将自动填充,每行将具有自己的唯一值.在那里,不要忘记删除自己添加KEY_ID到ContentValues.
标签：android,java,sqlite,database,unique-constraint 来源： https://codeday.me/bug/20190930/1836112.html