Qt问题：添加表格小部件项目

Question

我有一个发票表格，我用它来创建发票并显示存储的发票结果。当我尝试从数据库中读取数据并显示时，我遇到了以下错误：

QTableWidget：无法插入已被另一个QTableWidget拥有的项目 QTableWidget：无法插入已被另一个QTableWidget拥有的项目 QTableWidget：无法插入已被另一个QTableWidget拥有的项目 QTableWidget：无法插入已被另一个QTableWidget拥有的项目 QTableWidget：无法插入已被另一个QTableWidget拥有的项目

我不理解为什么会出现这种情况。我尝试运行的查询将返回4行数据。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());
                }
            }

什么导致了这个错误？

- Root0x

Answer 1

这是因为您正在尝试将在循环外创建的相同项目多次设置到同一张表中。请将代码更改为：

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();

    ...
}

- svlasov