新建QSqlTableModel類的子類，重寫data函數，具體如下
頭文件
#ifndef MYSQLTABLEMODEL_H
#define MYSQLTABLEMODEL_H
#include <QObject>
#include <QSqlTableModel>
class MySqlTableModel : public QSqlTableModel
{
public:
MySqlTableModel(QObject *parent = 0, QSqlDatabase db = QSqlDatabase());
void SetSelectColQuery(QString scq);
QVariant data(const QModelIndex &index, int role = Qt::TextAlignmentRole) const override;
protected:
QString selectStatement() const;
QString m_strSelectColQuery;
};
#endif // MYSQLTABLEMODEL_H
源文件：
#include "MySqlTableModel.h"
MySqlTableModel::MySqlTableModel(QObject *parent, QSqlDatabase db)
: QSqlTableModel(parent, db)
{
}
void MySqlTableModel::SetSelectColQuery(QString scq)
{
m_strSelectColQuery = scq;
}
QVariant MySqlTableModel::data(const QModelIndex &index, int role) const
{
QVariant value = QSqlQueryModel::data(index, role);
if (Qt::TextAlignmentRole == role) {
value = Qt::AlignCenter;
}
return value;
}
QString MySqlTableModel::selectStatement() const
{
return m_strSelectColQuery;
}
但此時還應該注意到重寫的函數data第二個參數默認值為int role = Qt::TextAlignmentRole，因此在具體用到data函數時應該根據具體需要明確輸入role的值，比如獲取某一單元格的值時應指定該參數的值為Qt::DisplayRole，代碼為QString str = m_pTableModal->data(m_pTableModal->index(row, col), Qt::DisplayRole).toString();