Question

我尝试从JSON中提取数据并将其放入数据库中。

这是我插入的地方：

 for (int i = 0; i < listArray.length(); i++) {

            //extraction to get "time" and "weather_description"
            //............

            //insertion:

            ContentValues values = new ContentValues();

            //values.put(WeatherEntry._ID,i);
            values.put(WeatherEntry.DATE_COLUMN, time);
            values.put(WeatherEntry.DESCRIPTION_COLUMN, weather_description);

            getContentResolver().insert(WeatherEntry.CONTENT_URI, values);
}

SQLiteOpenHelper：

public class WeatherDb extends SQLiteOpenHelper {

  private static final int DATABASE_VERSION = 1;
  static final String DATABASE_NAME = "weather.db";

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

  @Override
  public void onCreate(SQLiteDatabase sqLiteDatabase) {
      String WEATHER_QUERY = "CREATE TABLE "+ WeatherEntry.WEATHER_TABLE_NAME+" ("+
              WeatherEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
              WeatherEntry.DATE_COLUMN+" TEXT, "+
              WeatherEntry.DESCRIPTION_COLUMN+" TEXT );";

      sqLiteDatabase.execSQL(WEATHER_QUERY);
  }

  @Override
  public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

  }
}

只有第一行（_ID=0）才能进入数据库。

我也收到了错误消息： android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: weather._id (code 1555)

Answer 1

尝试添加AUTOINCREMENT这样的内容，而不是插入i：

WeatherEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT"

只能在SQLite数据库中插入一行

1 个答案: