Qt 添加表格小部件项目的问题

Posted 2023-02-21

【中文标题】Qt 添加表格小部件项目的问题

【英文标题】：Qt Problems Adding Table Widget Items

【发布时间】：2015-03-22 13:55:56

【问题描述】：

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，我收到了

的错误

QTableWidget：不能插入已经被另一个 QTableWidget 拥有的项目 QTableWidget：无法插入已由另一个 QTableWidget 拥有的项目 QTableWidget：无法插入已由另一个 QTableWidget 拥有的项目 QTableWidget：无法插入已由另一个 QTableWidget 拥有的项目 QTableWidget：不能插入已经被另一个 QTableWidget 拥有的项目

我不明白为什么会这样。我尝试运行的查询将返回 4 行。我的代码在下面

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？

【参考方案1】：

这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();

    ...