我有一个发票表格,我可以用来创建发票和显示已存储发票的结果。我在尝试从数据库中读取数据并显示它时出现以下错误:
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:无法插入已被另一个QTableWidget拥有的项目另一个QTableWidget QTableWidget:无法插入另一个QTableWidget已拥有的项目
我不明白为什么这是原因。我尝试运行的查询将返回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());
}
}
是什么导致此错误?
这是因为您试图将在循环外创建的相同项目多次设置到同一表中。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();
...
}
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