QT link MSSQL

Qt link MSSQL

Reference article :

Microsoft ODBC The driver 17 for SQL Server Connection Strings - ConnectionStrings.com

The first 1 Ways of planting

Configure local ODBC Source

Reference article : Qt Connect SQL server database _Bruce-XIAO The blog of -CSDN Blog _qt Connect sqlserver

Matching code :

//  The first method 
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setHostName("localhost");
    db.setDatabaseName("mssql");  // Set data source name 
    db.setUserName("SYSTEM");
    db.setPassword("SYSTEM123,.");

The first 2 Ways of planting

have access to SQL Server Link string to achieve , The way is as follows

#include <QtWidgets>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlRecord>


bool OpenDatabase()
{
    
/*  The first method  QSqlDatabase db = QSqlDatabase::addDatabase("QODBC"); db.setHostName("localhost"); db.setDatabaseName("mssql"); // Set data source name  db.setUserName("sqluser"); db.setPassword("password"); */

/*  The second method   Link string  */
    QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");

    db.setDatabaseName(QString("DRIVER={SQL SERVER};"
                               "SERVER=%1;" // Server name 
                               "DATABASE=%2;"// Database name 
                               "UID=%3;"     // Login name 
                               "PWD=%4;"     // password 
                               )
                       .arg("192.168.1.207")
                       .arg("SCADA_AVIC_SERVER")
                       .arg("SYSTEM")
                       .arg("SYSTEM123,.")
                       );

    bool ok=db.open();
    if(ok)
    {
    
        qDebug()<<" Open database successfully ";
    }
    else
    {
    
        qDebug()<<" Failed to open database ";
    }

    return ok;
}


bool queryTable(QString tableName)
{
    
    QString sql = "select * from %1";
    sql = sql.arg (tableName);
    QSqlQuery query;
    query.exec (sql);

    int i = 0;
    qDebug() << query.size () << query.record ().count ();
    auto record = query.record ();
    QStringList colNames;
    for (int i = 0; i < record.count (); ++i) {
    
        colNames << QString("%1: ").arg (i,3,10,QChar('0')) + record.fieldName (i);
    }
    qDebug() << colNames.join (" , ");



    while(query.next ()){
    
        QStringList  rowRecord;
        rowRecord << (QString("%1").arg (++i,4,10,QChar('0')));
        for (int j = 0; j < record.count (); ++j) {
    
            rowRecord << query.value (j).toString ();
        }

        auto string =  rowRecord.join (" ");
        qDebug() << string;
    }

    qDebug() << query.size ();
    return query.size ();
}

int main(int argc, char *argv[])
{
    
    QApplication a(argc, argv); //  This line can't be less 
    OpenDatabase();
    queryTable("T_S_BASE_USER");
    return 0;
}

summary

Obviously 2 This way will be better , There is no need to configure local ODBC Source .