qt的sqlite数据库问题

zzhcpp

shiyan.h
#include <QPushButton>
#include <QVBoxLayout>
#include <QWidget>
#include <QLineEdit>
#include <QtSql>
class shiyan : public QWidget
{
Q_OBJECT
QPushButton *charu;
QPushButton *chaxun;
QLineEdit *bianji;
QSqlDatabase db;

public:
     shiyan(QWidget *parent = 0);
public slots:
     void charuzhi();
void huoquzhi();
};
shiyan.cpp
#include <QString>
#include <QSqlQuery>
#include "shiyan.h"

shiyan::shiyan(QWidget *parent):QWidget(parent)
{


     charu = new QPushButton("charu");
chaxun = new QPushButton("chaxun");
bianji = new QLineEdit("abc");

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(bianji);
     layout->addWidget(charu);
     layout->addWidget(chaxun);
     setLayout(layout);
db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("/home/zzh/123/zzh");
db.open();
connect(charu,SIGNAL(clicked()),this,SLOT(charuzhi()));
connect(chaxun,SIGNAL(clicked()),this,SLOT(huoquzhi()));

     


}


void shiyan::charuzhi()
{

if(db.isOpen()){
QString zhi = bianji->text();
QSqlQuery query;
query.prepare("insert into biao values(:id)");
query.bindValue(":id",zhi);
query.exec();
}

}
void shiyan::huoquzhi()
{
QSqlQuery query;
query.exec("SELECT a FROM biao");
while (query.next()) {
         QString name = query.value(0).toString();
         bianji->setText(name);
         
     }


}
main.cpp
#include <QApplication>
#include "shiyan.h"
int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
     shiyan widget;

     widget.show();
     return app.exec();
}
前两天我编译程序，能编译，提示我找不到槽，后来槽搞定了，数据库又打不开了，后来数据库能打开了，但只能在命令行下执行，直接双击执行，数据库就工作不了了，我用当前路径./zzh和zzh都不行，换成绝对路径就正常了，就象上面写的那样。QT只能使用绝对路径来定位数据库吗？

zzhcpp

解决