四、導出EXCEL表

最后，就是導出excel了，創建一個新的類

odbcexcel.h文件

#ifndef ODBCEXCEL_H
#define ODBCEXCEL_H


#include 
#include 
#include 
#include 
#include 
#include 


class OdbcExcel
{
public:
    OdbcExcel();
    //將數據保存為excel
    bool static save(QString filePath,QStringList headers,QList data,QString comment="");
    //將QTableView保存為excel
    bool static saveFromTable(QString filePath,QTableView *tableView,QString comment="");
    //獲取錯誤信息
    QString static getError(){return error;}
private:
    void static printError( QSqlError error);
    bool static insert(QSqlQuery& query, QString sheetName, QStringList slist);
    static QString error;
};
#endif // ODBCEXCEL_H

odbcexcel.c

#include "odbcexcel.h"


#include "odbcexcel.h"
#include 


OdbcExcel::OdbcExcel()
{
}
QString OdbcExcel::error;


bool OdbcExcel::save(QString filePath, QStringList headers, QList data,QString comment)
{
    QString sheetName = "Sheet1";


    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC","excelexport");
    if( !db.isValid())
    {
        error="數據庫驅動異常";
        return false;   //! type error
    }


    QString dsn = "DRIVER={Microsoft Excel Driver (*.xls)};"
            "DSN='';FIRSTROWHASNAMES=1;READONLY=FALSE;CREATE_DB=\""+filePath+"\\";DBQ="+filePath;
    db.setDatabaseName( dsn);


    // open connection
    if( !db.open())
    {
        error="無法打開數據庫";
        return false;  //! db error
    }


    QSqlQuery query(db);
    QString sql;


    // drop the table if it's already exists
    sql = QString("DROP TABLE [%1]").arg(sheetName);
    query.exec( sql);
    //create the table (sheet in Excel file)
    sql = QString("CREATE TABLE [%1] (").arg(sheetName);
    foreach (QString name, headers) {
        sql +=QString("[%1] varchar(200)").arg(name);
        if(name!=headers.last())
            sql +=",";
    }
    sql += ")";
    query.prepare( sql);
    if( !query.exec()) {
        OdbcExcel::printError( query.lastError());
        db.close();
        return false;
    }
    foreach (QStringList slist, data) {
        insert(query,sheetName,slist);
    }


    if(!comment.isEmpty())
    {
        QStringList slist;
        slist<for(int i=0,n=headers.size()-1;i<n;i++)
        {
            slist<<"";
        }
        insert(query,sheetName,slist);
    }


    db.close();
    return true;
}


bool OdbcExcel::saveFromTable(QString filePath,QTableView *tableView, QString comment)
{
    QAbstractItemModel* model=tableView->model();
    const int column=model->columnCount();
    const int row=model->rowCount();


    //header
    QStringList headers;
    for(int i=0;i//隱藏列
        if(tableView->isColumnHidden(i))
            continue;
        headers<headerData(i,Qt::Horizontal).toString();
    }


    //data
    QStringList list;
    QList data;
    for(int i=0;iif(model->index(i,0).data().isNull())
            continue;
        list.clear();
        for(int j=0;j//隱藏列
            if(tableView->isColumnHidden(j))
                continue;
            list<index(i,j).data().toString();
        }
        data<<list;
    }
    return OdbcExcel::save(filePath,headers,data,comment);
}


void OdbcExcel::printError(QSqlError error)
{
    QString sqlerr = error.text();
    error=sqlerr;
    qCritical()<query, QString sheetName, QStringList slist)
{
    QString sSql = QString("INSERT INTO [%1] VALUES(").arg( sheetName);
    for(int i=0,n=slist.size();i<n;i++)
    {
        sSql+=QString(":%1").arg(i);
        if(i!=n-1)
            sSql+=",";
        else
            sSql+=")";
    }
    query.prepare( sSql);
    for(int i=0,n=slist.size();i<n;i++)
    {
        query.bindValue(QString(":%1").arg(i),slist.at(i));
    }
    if( !query.exec()) {
        printError( query.lastError());
        return false;
    }
    return true;
}

然后在UI界面中創建一個導出按鍵，并在按鍵按下時調用數據庫導出類來完成導出excel功能

//導出
void sqlite_sqlquerymodel_edit::on_pushButton_export_clicked()
{
    QFileDialog dlg;
    dlg.setAcceptMode(QFileDialog::AcceptSave);
    //  Qt 5
    dlg.setDirectory(QStandardPaths::writableLocation(QStandardPaths::DesktopLocation));
    //  Qt 4
    //  dlg.setDirectory(QDesktopServices::storageLocation(QDesktopServices::DesktopLocation));
    dlg.setNameFilter("*.xls");
    dlg.selectFile(QDate::currentDate().toString("yyyy-MM-dd.xls"));
    if(dlg.exec()!= QDialog::Accepted)
        return;
    QString filePath=dlg.selectedFiles()[0];
    if(OdbcExcel::saveFromTable(filePath,ui->tableView,"注釋：無")) {
        QMessageBox::information(this,tr("提示"),tr("保存成功"));
    }
    else{
        QString msg="保存失敗！\\n\\r"+OdbcExcel::getError();
        QMessageBox::critical(this,tr("錯誤"),tr(msg.toUtf8()));
    }
}

點擊導出后，彈出保存文件框保存文件

保存成功

然后打開excel查看保存的數據跟Qt上的一致

OK，Qt操作數據庫就到這了。