Qt如何实现数据查询导出打印

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void DataHelper::dataout(const QString &fileName, const QString &sheetName, const QString &title,                         const QList<QString> &columnNames, const QList<int> &columnWidths,                         const QStringList &content, bool landscape){    DataContent dataContent;    dataContent.fileName = fileName;    dataContent.sheetName = sheetName;    dataContent.title = title;    dataContent.columnNames = columnNames;    dataContent.columnWidths = columnWidths;    dataContent.content = content;    dataContent.landscape = landscape;    dataout(dataContent);}QString DataHelper::dataout(QTableView *table, QStandardItemModel *model, quint8 type, const QString &file, const QString &title, const QString &sheet){    //从数据模型拿到行列    int row = model->rowCount();    int column = model->columnCount();    if (row == 0 || column == 0) {        return QString();    }    //获取数据集合    QStringList content;    for (int i = 0; i < row; ++i) {        QStringList list;        for (int j = 0; j < column; ++j) {            list << model->item(i, j)->text();        }        //每行数据作为一个整体字符串带分割符 ; 存入        content << list.join(";");    }    //获取列名和列宽    QList<QString> columnNames;    QList<int> columnWidths;    for (int i = 0; i < column; ++i) {        columnNames << model->headerData(i, Qt::Horizontal).toString();        columnWidths << table->columnWidth(i);    }    return dataout(type, file, title, sheet, content, columnNames, columnWidths);}QString DataHelper::dataout(QTableWidget *table, quint8 type, const QString &file, const QString &title, const QString &sheet){    //从数据模型拿到行列    int row = table->rowCount();    int column = table->columnCount();    if (row == 0 || column == 0) {        return QString();    }    //获取数据集合    QStringList content;    for (int i = 0; i < row; ++i) {        QStringList list;        for (int j = 0; j < column; ++j) {            list << table->item(i, j)->text();        }        //每行数据作为一个整体字符串带分割符 ; 存入        content << list.join(";");    }    //获取列名和列宽    QList<QString> columnNames;    QList<int> columnWidths;    for (int i = 0; i < column; ++i) {        columnNames << table->horizontalHeaderItem(i)->text();        columnWidths << table->columnWidth(i);    }    return dataout(type, file, title, sheet, content, columnNames, columnWidths);}QString DataHelper::dataout(quint8 type, const QString &file, const QString &title,                            const QString &sheet, const QStringList &content,                            const QStringList &columnNames, const QList<int> &columnWidths){    //设置结构体数据    DataContent dataContent;    //填充内容    dataContent.content = content;    //设置列名列宽    dataContent.columnNames = columnNames;    dataContent.columnWidths = columnWidths;    //设置标题    dataContent.title = title;    //设置默认对齐    dataContent.defaultAlignment = 0;    //如果是导出数据则先判断文件名称是否为空,为空则弹出文件对话框选择    QString fileName = file;    if (fileName.isEmpty() && type < 3) {        //不同的格式后缀        QString filter = "all files (*.*)";        if (type == 0) {            filter = "csv files (*.csv)";        } else if (type == 1) {            filter = "xls files (*.xls)";        } else if (type == 2) {            filter = "pdf files (*.pdf)";        }        fileName = QFileDialog::getSaveFileName(0, "选择保存文件", "", filter);        if (fileName.isEmpty()) {            return fileName;        }    }    //设置文件名    dataContent.fileName = fileName;    //xls还需要设置表名    dataContent.sheetName = sheet;    //调用静态函数    if (type == 0) {        //重新组织内容,前面写入标题,分隔符换成csv的定义的分隔符        QStringList list;        //把标题加到内容中        list << columnNames.join(DataCsv::CsvSpliter);        //重新更换分隔符        foreach (QString text, content) {            text.replace(";", DataCsv::CsvSpliter);            list << text;        }        DataCsv::outputData(fileName, list);    } else if (type == 1) {        DataXls::saveXls(dataContent);    } else if (type == 2) {        DataPrint::savePdf(dataContent);    } else if (type == 3) {        DataPrint::print(dataContent);    }    return fileName;}

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