Question

在我添加UserUid字段之前，它工作得很好，现在它不断崩溃，我不知道为什么。这是一个数据库，我已修复它可以从特定的当前用户中选择，但是它告诉我该列不存在。

我已经重新创建了Sqlite数据库，没有运气

我遇到的错误是在GetCountCart（）处，但我认为问题不存在

public class Database extends SQLiteAssetHelper {
private static String DB_NAME="OrderMeDB.db";
private static int DB_VER=1;

public Database(Context context) {
    super(context, DB_NAME,null,DB_VER );
}

public List<OrderModel> getCarts(String userUid)
{
    SQLiteDatabase db = getReadableDatabase();
    SQLiteQueryBuilder qb = new SQLiteQueryBuilder();

    String[] sqlSelect = {"UserUid","DenumireProdus" , "Cantitate" , "Pret"};
    String sqlTable = "Comanda";

    qb.setTables(sqlTable);
    Cursor c = qb.query(db , sqlSelect , "UserUid=?",new String[]{userUid},null,null,null);

    final List<OrderModel> result = new ArrayList<>();
    if(c.moveToFirst())
    {
        do{
            result.add(new OrderModel(
                    c.getString(c.getColumnIndex("UserUid")),
                    c.getString(c.getColumnIndex("DenumireProdus")),
                    c.getInt(c.getColumnIndex("Cantitate")),
                    c.getInt(c.getColumnIndex("Pret"))
            ));
        }while (c.moveToNext());
    }
    return result;
}

public boolean checkFoodExists(String userUid , String denumireProdus)
{
    boolean flag = false;
    SQLiteDatabase db = getReadableDatabase();
    Cursor cursor = null;
    String SQLQuery = String.format("SELECT * FROM Comanda WHERE UserUid='%s' AND DenumireProdus='%s'",userUid,denumireProdus);
    cursor = db.rawQuery(SQLQuery,null);
    if(cursor.getCount()>0)
        flag = true;
    else
        flag = false;
    cursor.close();
    return false;
}
public void addToCart(OrderModel order)
{
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("INSERT OR REPLACE INTO Comanda(UserUid,DenumireProdus,Cantitate,Pret) VALUES('%s',%s','%s','%s');",
            order.getUserUid(),
            order.getDenumireProdus(),
            order.getCantitate(),
            order.getPret());
    db.execSQL(query);
}

public void cleanCart(String userUid)
{
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("DELETE FROM Comanda WHERE UserUid='%s'",userUid);
    db.execSQL(query);

}
public void removeFromCart(String userUid,String denumireProdus)
{
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("DELETE FROM Comanda WHERE UserUid='%s' AND DenumireProdus='%s'",userUid,denumireProdus);
    db.execSQL(query);
}
public void increaseCart(String userUid,String denumireProdus)
{
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("UPDATE Comanda SET Cantitate= Cantitate+1 WHERE UserUid='%s' AND DenumireProdus='%s'",userUid,denumireProdus);
    db.execSQL(query);
}
public int getCountCart(String userUid) {
    int count = 0;
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("SELECT COUNT(*) FROM Comanda WHERE UserUid='%s'",userUid);
    Cursor cursor =db.rawQuery(query,null);
    if (cursor.moveToFirst())
    {
        do{
            count = cursor.getInt(0);
        }
        while (cursor.moveToNext());
    }
    return count;

}
public int getItemCount(String denumireProdus , String userUid) {
    int count = 0;
    SQLiteDatabase db = getReadableDatabase();
    String query = String.format("SELECT COUNT(*) FROM Comanda WHERE UserUid='s' AND DenumireProdus='%s' ",userUid,denumireProdus);
    Cursor cursor =db.rawQuery(query,null);
    if (cursor.moveToFirst())
    {
        do{
            count = cursor.getInt(0);
        }
        while (cursor.moveToNext());
    }
    return count;

}
}

这是我得到的错误：

java.lang.RuntimeException：无法启动活动ComponentInfo {Food}：android.database.sqlite.SQLiteException：无此类列：UserUid（代码1 SQLITE_ERROR [1]）：，同时编译：SELECT COUNT（*）FROM Comanda WHERE UserUid ='QM9amP6CX4g24wrq7Hu2'

Answer 1

根据我的理解，错误消息指出您尚未将列添加到表中。我对Java不太熟悉，但是我会检查列是否已创建并在正确的表中。

如何在sqlite中修复“无此类列”

1 个答案: