2

我有一个发票表格，我用它来创建发票和显示存储发票的结果。当我试图从数据库中读回数据并显示它时，我得到了错误

QTableWidget：不能插入一个已经被另一个QTableWidget拥有的项目 QTableWidget：不能插入一个已经被另一个QTableWidget拥有的项目 QTableWidget：不能插入一个已经被另一个QTableWidget拥有的项目 QTableWidget：不能插入一个已经被另一个QTableWidget拥有的项目另一个 QTableWidget QTableWidget：不能插入已经被另一个 QTableWidget 拥有的项目

我不明白这是为什么。我试图运行的查询将返回 4 行。我的代码如下

QString CompanyID;
            int row = 0;
            ui->comboBox_Invoice_Account_Search->setCurrentIndex(1);
            QSqlQuery Account_Name_Query;
            QTableWidgetItem *Qty_Search = new QTableWidgetItem();
            QTableWidgetItem *Description_Search = new QTableWidgetItem();
            QTableWidgetItem *Product_Code_Search = new QTableWidgetItem();
            QTableWidgetItem *Unit_Price_Search = new QTableWidgetItem();
            QTableWidgetItem *Total_Price_Search = new QTableWidgetItem();
            while(Query.next())
            {
                CompanyID = Query.value(10).toString();
                //qDebug() << "CompanyID " << CompanyID;
                ui->lineEdit_Invoice_VAT->setText(Query.value(9).toString());
                ui->lineEdit_Invoice_Total->setText(Query.value(8).toString());
                ui->lineEdit_Goods_Total->setText(Query.value(7).toString());
                Qty_Search->setText(Query.value(3).toString());
                Description_Search->setText(Query.value(4).toString());
                Product_Code_Search->setText(Query.value(5).toString());
                Unit_Price_Search->setText(Query.value(6).toString());
                Total_Price_Search->setText(Query.value(7).toString());
                ui->tableWidget_Invoice->setItem(row, 0, Qty_Search);
                ui->tableWidget_Invoice->setItem(row, 1, Description_Search);
                ui->tableWidget_Invoice->setItem(row, 2, Product_Code_Search);
                ui->tableWidget_Invoice->setItem(row, 3, Unit_Price_Search);
                ui->tableWidget_Invoice->setItem(row, 4, Total_Price_Search);
                row++;
                Account_Name_Query.prepare("SELECT Company_Name FROM Customer WHERE Company_ID = '"+ CompanyID +"'");
                Account_Name_Query.exec();
                while(Account_Name_Query.next())
                {
                    ui->lineEdit_Invoice_Account->setText(Account_Name_Query.value(0).toString());
                }
            }

是什么导致了这个错误？

4

1 回答 1

5

那是因为您试图将在循环之外创建的相同项目多次设置到同一个表中。将您的代码更改为：

while(Query.next())
{
    QTableWidgetItem *Qty_Search = new QTableWidgetItem();
    QTableWidgetItem *Description_Search = new QTableWidgetItem();
    QTableWidgetItem *Product_Code_Search = new QTableWidgetItem();
    QTableWidgetItem *Unit_Price_Search = new QTableWidgetItem();
    QTableWidgetItem *Total_Price_Search = new QTableWidgetItem();

    ...
}
于 2015-03-22T14:13:44.790 回答