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1、QSqlTableModel的主要函数如下

• 1、QSqlDatabase database() const

  • 返回其数据库连接

• 2、void setTable(const QString &tableName)

  • 设置数据表名称，不立即读取记录，但会提取字段信息

• 3、QString tableName() const

  • 但会设置的数据表名称

• 4、void setFilter(const QString &filter)

  • 设置记录过滤条件

• 5、void setSort(int column, Qt::SortOrder order)

  • 设置排序字段和排序规则，需调用select()才生效

• 6、void sort(int column, Qt::SortOrder order)

  • 按列号和排序规则立即进行排序并获取数据

• 7、void setEditStrategy(QSqlTableModel::EditStrategy strategy)

  • 设置编辑策略

• 8、bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role = Qt::EditRole)

  • 设置表头，一般用于设置字段的显示名称

• 9、int fieldIndex(const QString &fieldName) const

  • 根据字段名称返回其在模型中的字段序号，若字段不存在则返回-1

• 10、bool isDirty() const

  • 若有未更新到数据库的修改，就返回true，否则返回false

• 11、QSqlIndex primaryKey() const

  • 返回数据表的主索引

• 12、int rowCount(const QModelIndex &parent = QModelIndex()) const

  • 返回记录条数

• 13、bool select()

  • 查询数据表的数据，并使用设置的排序和过滤规则

• 14、bool selectRow(int row)

  • 刷新获取指定行号的记录

• 15、void clear()

  • 清除数据模型，释放所有获取的数据

• 16、QSqlRecord record() const

  • 返回一条空记录，只有字段名，可用来获取字段信息

• 17、QSqlRecord record(int row) const

  • 返回行号为row的一条记录，包含记录的数据

• 18、bool setRecord(int row, const QSqlRecord &values)

  • 更新一条记录的数据到数据模型，源和目标之间用过字段名称匹配，而不是按位置匹配

• 19、bool insertRecord(int row, const QSqlRecord &record)

  • 在行号row之前插入一条记录

• 20、bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex())

  • 在行号row之前插入count空行，编辑策略为OnFieldChange或OnRowChange时只能插入一行

• 21、bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex())

  • 从行号row开始，删除count行，若编辑策略为OnManualSubmit，需调用submitAll()才从数据表里删除

• 22、void revertRow(int row)

  • 取消行号为row的记录的修改

• 23、void revert()

  • 编辑策略为OnRowChange或OnFieldChange时，取消当前行的修改，对OnManualSubmit编辑策略无效

• 24、void revertAll()

  • 取消所有未提交的修改

• 25、bool submit()

  • 提交当前行的修改到数据库，对OnManualSubmit编辑策略无效

• 26、bool submitAll()

  • 提交所有未更新的修改到数据库，若成功则返回true，否则返回false，错误的详细信息可以从lastError()获取

2、QSqlRecord的主要函数如下

QSqlRecord封装了对记录的字段定义和数据的操作

• 1、void clear()

  • 清除记录的所有字段定义和数据

• 2、void clearValues()

  • 清除所有字段的数据，将字段数据内容设置为null

• 3、bool contains(const QString &name) const

  • 判断记录是否含有名称为name的字段

• 4、bool isEmpty() const

  • 若字段里没有字段返回true，否则返回false

• 5、int count() const

  • 返回记录的字段个数

• 6、QString fieldName(int index) const

  • 返回序号为index的字段的名称

• 7、int indexOf(const QString &name) const

  • 返回字段名称为name的字段的序号，如果字段不存在则返回-1

• 8、QSqlField field(const QString &name) const

  • 返回字段名称为name的字段对象

• 9、QVariant value(const QString &name) const

  • 返回字段名称为name的字段的值

• 10、void setValue(const QString &name, const QVariant &val)

  • 设置字段名称为name的字段的值为val

• 11、bool isNull(const QString &name) const

  • 判断字段名称为name的字段数据是否为null

• 12、void setNull(const QString &name)

  • 设置名称为name的字段的值为null

3、QSqlField的主要函数如下

• 1、void clear()

  • 清除字段数据，设为NULL，如果字段是只读的，则不清除

• 2、bool isNull() const

  • 判断字段值是否为NULL

• 3、void setReadOnly(bool readOnly)

  • 设置一个字段为只读，只读的字段不能用setValue()函数设置值，也不能用clear()函数清除值

• 4、QVariant value() const

  • 返回字段的值

• 5、void setValue(const QVariant &value)

  • 设置字段的值

例程如下

头文件

#pragma once#include #include "ui_QGuiSql.h"#include #include #include #include #include "QComboboxDelegate.h"class QGuiSql : public QMainWindow{    Q_OBJECTpublic:    QGuiSql(QWidget* parent = Q_NULLPTR);    ~QGuiSql();private:    Ui::QGuiSql ui;private:    QSqlDatabase  m_sqlDB;//数据库连接    QSqlTableModel* m_pTabModel;  //数据模型    QItemSelectionModel* m_pSelection; //选择模型    QDataWidgetMapper* m_pDataMapper; //数据映射    QComboBoxDelegate m_delegateSex; //自定义数据代理，性别    QComboBoxDelegate m_delegateDepart; //自定义数据代理，部门private slots:    void Selection_currentChanged(const QModelIndex& current, const QModelIndex& previous);    void Selection_currentRowChanged(const QModelIndex& current, const QModelIndex& previous);    void actOpenDB_triggered();//打开数据表    void actAppend_triggered();//添加    void actInsert_triggered();//插入    void actDelete_triggered();//删除    void actPhoto_triggered();//设置照片    void actPhotoClear_triggered();//清除照片    void actScan_triggered();//涨工资，记录遍历    void actFields_triggered();//字段列表    void actSubmit_triggered();//保存    void actRevert_triggered();//取消    void radioBtnAscend_clicked();//升序    void radioBtnDescend_clicked();//降序    void radioBtnMan_clicked();//男过滤    void radioBtnWoman_clicked();//女过滤    void radioBtnBoth_clicked();//男女过滤    void comboFields_currentIndexChanged(int index);};

源文件

#include "QGuiSql.h"#include #include #include #include #include #pragma execution_character_set("utf-8")QGuiSql::QGuiSql(QWidget* parent)    : QMainWindow(parent){    ui.setupUi(this);    // tableView显示属性设置    ui.tableView->setSelectionBehavior(QAbstractItemView::SelectItems);    ui.tableView->setSelectionMode(QAbstractItemView::SingleSelection);    ui.tableView->setAlternatingRowColors(true);    ui.tableView->resizeColumnsToContents();    ui.tableView->horizontalHeader()->setStretchLastSection(true);    connect(ui.actOpenDB, SIGNAL(triggered()), this, SLOT(actOpenDB_triggered()));    connect(ui.actAppend, SIGNAL(triggered()), this, SLOT(actAppend_triggered()));    connect(ui.actInsert, SIGNAL(triggered()), this, SLOT(actInsert_triggered()));    connect(ui.actDelete, SIGNAL(triggered()), this, SLOT(actDelete_triggered()));    connect(ui.actPhoto, SIGNAL(triggered()), this, SLOT(actPhoto_triggered()));    connect(ui.actPhotoClear, SIGNAL(triggered()), this, SLOT(actPhotoClear_triggered()));    connect(ui.actScan, SIGNAL(triggered()), this, SLOT(actScan_triggered()));    connect(ui.actFields, SIGNAL(triggered()), this, SLOT(actFields_triggered()));    connect(ui.actSubmit, SIGNAL(triggered()), this, SLOT(actSubmit_triggered()));    connect(ui.actRevert, SIGNAL(triggered()), this, SLOT(actRevert_triggered()));    connect(ui.radioBtnAscend, SIGNAL(clicked()), this, SLOT(radioBtnAscend_clicked()));    connect(ui.radioBtnDescend, SIGNAL(clicked()), this, SLOT(radioBtnDescend_clicked()));    connect(ui.radioBtnMan, SIGNAL(clicked()), this, SLOT(radioBtnMan_clicked()));    connect(ui.radioBtnWoman, SIGNAL(clicked()), this, SLOT(radioBtnWoman_clicked()));    connect(ui.radioBtnBoth, SIGNAL(clicked()), this, SLOT(radioBtnBoth_clicked()));    connect(ui.comboFields, SIGNAL(currentIndexChanged(int)), this, SLOT(comboFields_currentIndexChanged(int)));}QGuiSql::~QGuiSql(){}void QGuiSql::Selection_currentChanged(const QModelIndex& current, const QModelIndex& previous){    //更新actPost和actCancel 的状态    Q_UNUSED(current);    Q_UNUSED(previous);    ui.actSubmit->setEnabled(m_pTabModel->isDirty()); //有未保存修改时可用    ui.actRevert->setEnabled(m_pTabModel->isDirty());}void QGuiSql::Selection_currentRowChanged(const QModelIndex& current, const QModelIndex& previous){    Q_UNUSED(previous);    // 行切换时的状态控制    ui.actDelete->setEnabled(current.isValid());    ui.actPhoto->setEnabled(current.isValid());    ui.actPhotoClear->setEnabled(current.isValid());    if (!current.isValid())    {        ui.dbLabPhoto->clear(); //清除图片显示        return;    }    m_pDataMapper->setCurrentIndex(current.row()); //更细数据映射的行号    int curRecNo = current.row();//获取行号    QSqlRecord  curRec = m_pTabModel->record(curRecNo); //获取当前记录    if (curRec.isNull("Photo"))  //图片字段内容为空    {        ui.dbLabPhoto->clear();    }    else    {        QByteArray data = curRec.value("Photo").toByteArray();        QPixmap pic;        pic.loadFromData(data);        ui.dbLabPhoto->setPixmap(pic.scaledToWidth(ui.dbLabPhoto->size().width()));    }}//QTableView的SelectionModel的行发生了变化，进行处理void QGuiSql::on_currentRowChanged(const QModelIndex& current, const QModelIndex& previous){    Q_UNUSED(previous);    // 行切换时的状态控制    ui.actRecDelete->setEnabled(current.isValid());    if (!current.isValid())    {        ui.dbLabPhoto->clear(); //清除图片显示        return;    }    m_pDataMapper->setCurrentModelIndex(current);//更新数据映射的行号    bool first = (current.row() == 0); //是否首记录    bool last = (current.row() == m_pQryModel->rowCount() - 1);//是否尾记录    ui.actRecFirst->setEnabled(!first); //更新使能状态    ui.actRecPrevious->setEnabled(!first);    ui.actRecNext->setEnabled(!last);    ui.actRecLast->setEnabled(!last);    int curRecNo = m_pSelection->currentIndex().row();    QSqlRecord  curRec = m_pQryModel->record(curRecNo); //获取当前记录    int empNo = curRec.value("EmpNo").toInt();    QSqlQuery query; //查询当前empNo的Memo和Photo字段的数据    query.prepare("select EmpNo, Memo, Photo from employee where EmpNo = :ID");    query.bindValue(":ID", empNo);    query.exec();    query.first();    QVariant va = query.value("Photo");//    if (!va.isValid())  //图片字段内容为空    {        ui.dbLabPhoto->clear();    }    else    {        //显示照片        QByteArray data = va.toByteArray();        QPixmap pic;        pic.loadFromData(data);        ui.dbLabPhoto->setPixmap(pic.scaledToWidth(ui.dbLabPhoto->size().width()));    }    va = query.value("Memo");//显示备注    ui.dbEditMemo->setPlainText(va.toString());}//打开数据表void QGuiSql::actOpenDB_triggered(){    QString aFile = QFileDialog::getOpenFileName(this, "选择数据库文件", "", "SQL Lite数据库(*.db *.db3)");    if (aFile.isEmpty())  //选择SQL Lite数据库文件        return;    //打开数据库    m_sqlDB = QSqlDatabase::addDatabase("QSQLITE"); //添加 SQL LITE数据库驱动    m_sqlDB.setDatabaseName(aFile); //设置数据库名称    //DB.setHostName();    //DB.setUserName();    //DB.setPassword();    if (!m_sqlDB.open())   //打开数据库    {        QMessageBox::warning(this, "错误", "加载数据库失败", QMessageBox::Ok, QMessageBox::NoButton);        return;    }    //打开数据表    m_pTabModel = new QSqlTableModel(this, m_sqlDB);//数据表    m_pTabModel->setTable("employee"); //设置数据表    m_pTabModel->setEditStrategy(QSqlTableModel::OnManualSubmit);//数据保存方式，OnManualSubmit , OnRowChange    m_pTabModel->setSort(m_pTabModel->fieldIndex("empNo"), Qt::AscendingOrder); //排序    if (!(m_pTabModel->select()))//查询数据    {        QString szText = QString("打开数据表错误,错误信息 1%\n").arg(m_pTabModel->lastError().text());        QMessageBox::critical(this, "错误信息", szText, QMessageBox::Ok, QMessageBox::NoButton);        return;    }    //字段显示名    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("empNo"), Qt::Horizontal, "工号");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Name"), Qt::Horizontal, "姓名");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Gender"), Qt::Horizontal, "性别");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Height"), Qt::Horizontal, "身高");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Birthday"), Qt::Horizontal, "出生日期");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Mobile"), Qt::Horizontal, "手机");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Province"), Qt::Horizontal, "省份");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("City"), Qt::Horizontal, "城市");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Department"), Qt::Horizontal, "部门");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Education"), Qt::Horizontal, "学历");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Salary"), Qt::Horizontal, "工资");    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Memo"), Qt::Horizontal, "备注"); //这两个字段不再tableView中显示    m_pTabModel->setHeaderData(m_pTabModel->fieldIndex("Photo"), Qt::Horizontal, "照片");    //关联选择模型    m_pSelection = new QItemSelectionModel(m_pTabModel);    //theSelection当前项变化时触发currentChanged信号    connect(m_pSelection, SIGNAL(currentChanged(QModelIndex, QModelIndex)),        this, SLOT(Selection_currentChanged(QModelIndex, QModelIndex)));    //选择行变化时    connect(m_pSelection, SIGNAL(currentRowChanged(QModelIndex, QModelIndex)),        this, SLOT(Selection_currentRowChanged(QModelIndex, QModelIndex)));    ui.tableView->setModel(m_pTabModel);//设置数据模型    ui.tableView->setSelectionModel(m_pSelection); //设置选择模型    ui.tableView->setColumnHidden(m_pTabModel->fieldIndex("Memo"), true);//隐藏列    ui.tableView->setColumnHidden(m_pTabModel->fieldIndex("Photo"), true);//隐藏列    //tableView上为“性别”和“部门”两个字段设置自定义代理组件    QStringList strList;    strList << "男" << "女";    bool isEditable = false;    m_delegateSex.setItems(strList, isEditable);    ui.tableView->setItemDelegateForColumn(m_pTabModel->fieldIndex("Gender"), &m_delegateSex); //Combbox选择型    strList.clear();    strList << "销售部" << "技术部" << "生产部" << "行政部";    isEditable = true;    m_delegateDepart.setItems(strList, isEditable);    ui.tableView->setItemDelegateForColumn(m_pTabModel->fieldIndex("Department"), &m_delegateDepart); //Combbox选择型    //创建界面组件与数据模型的字段之间的数据映射    m_pDataMapper = new QDataWidgetMapper();    m_pDataMapper->setModel(m_pTabModel);//设置数据模型    m_pDataMapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);//    //dataMapper->setItemDelegate(new QSqlRelationalDelegate(this)); //含有外键的    //界面组件与tabModel的具体字段之间的联系    m_pDataMapper->addMapping(ui.dbSpinEmpNo, m_pTabModel->fieldIndex("empNo"));    m_pDataMapper->addMapping(ui.dbEditName, m_pTabModel->fieldIndex("Name"));    m_pDataMapper->addMapping(ui.dbComboSex, m_pTabModel->fieldIndex("Gender"));    m_pDataMapper->addMapping(ui.dbSpinHeight, m_pTabModel->fieldIndex("Height"));    m_pDataMapper->addMapping(ui.dbEditBirth, m_pTabModel->fieldIndex("Birthday"));    m_pDataMapper->addMapping(ui.dbEditMobile, m_pTabModel->fieldIndex("Mobile"));    m_pDataMapper->addMapping(ui.dbComboProvince, m_pTabModel->fieldIndex("Province"));    m_pDataMapper->addMapping(ui.dbEditCity, m_pTabModel->fieldIndex("City"));    m_pDataMapper->addMapping(ui.dbComboDep, m_pTabModel->fieldIndex("Department"));    m_pDataMapper->addMapping(ui.dbComboEdu, m_pTabModel->fieldIndex("Education"));    m_pDataMapper->addMapping(ui.dbSpinSalary, m_pTabModel->fieldIndex("Salary"));    m_pDataMapper->addMapping(ui.dbEditMemo, m_pTabModel->fieldIndex("Memo"));    //m_pDataMapper->addMapping(ui->dbPhoto,tabModel->fieldIndex("Photo")); //图片无法直接映射    m_pDataMapper->toFirst();//移动到首记录    QSqlRecord  emptyRec = m_pTabModel->record();//获取空记录，只有字段名    for (int i = 0; i < emptyRec.count(); i++)        ui.comboFields->addItem(emptyRec.fieldName(i));    //更新actions和界面组件的使能状态    ui.actOpenDB->setEnabled(false);    ui.actAppend->setEnabled(true);    ui.actInsert->setEnabled(true);    ui.actDelete->setEnabled(true);    ui.actScan->setEnabled(true);    ui.groupBoxSort->setEnabled(true);    ui.groupBoxFilter->setEnabled(true);}//添加void QGuiSql::actAppend_triggered(){    m_pTabModel->insertRow(m_pTabModel->rowCount(), QModelIndex()); //在末尾添加一个记录    QModelIndex curIndex = m_pTabModel->index(m_pTabModel->rowCount() - 1, 1);//创建最后一行的ModelIndex    m_pSelection->clearSelection();//清空选择项    m_pSelection->setCurrentIndex(curIndex, QItemSelectionModel::Select);//设置刚插入的行为当前选择行    int currow = curIndex.row(); //获得当前行    m_pTabModel->setData(m_pTabModel->index(currow, 0), 2000 + m_pTabModel->rowCount()); //自动生成编号    m_pTabModel->setData(m_pTabModel->index(currow, 2), "男");}//插入void QGuiSql::actInsert_triggered(){    QModelIndex curIndex = ui.tableView->currentIndex();    m_pTabModel->insertRow(curIndex.row(), QModelIndex());    m_pSelection->clearSelection();//清除已有选择    m_pSelection->setCurrentIndex(curIndex, QItemSelectionModel::Select);}//删除void QGuiSql::actDelete_triggered(){    QModelIndex curIndex = m_pSelection->currentIndex();//获取当前选择单元格的模型索引    m_pTabModel->removeRow(curIndex.row()); //删除最后一行}//设置照片void QGuiSql::actPhoto_triggered(){    QString aFile = QFileDialog::getOpenFileName(this, "选择图片文件", "", "照片(*.jpg)");    if (aFile.isEmpty())        return;    QByteArray data;    QFile* file = new QFile(aFile); //fileName为二进制数据文件名    file->open(QIODevice::ReadOnly);    data = file->readAll();    file->close();    int curRecNo = m_pSelection->currentIndex().row();    QSqlRecord  curRec = m_pTabModel->record(curRecNo); //获取当前记录    curRec.setValue("Photo", data); //设置字段数据    m_pTabModel->setRecord(curRecNo, curRec);    QPixmap pic;    pic.load(aFile);  //在界面上显示    ui.dbLabPhoto->setPixmap(pic.scaledToWidth(ui.dbLabPhoto->width()));}//清除照片void QGuiSql::actPhotoClear_triggered(){    int curRecNo = m_pSelection->currentIndex().row();    QSqlRecord  curRec = m_pTabModel->record(curRecNo); //获取当前记录    curRec.setNull("Photo");//设置为空值    m_pTabModel->setRecord(curRecNo, curRec);    ui.dbLabPhoto->clear();}//涨工资，记录遍历void QGuiSql::actScan_triggered(){    if (m_pTabModel->rowCount() == 0)        return;    for (int i = 0; i < m_pTabModel->rowCount(); i++)    {        QSqlRecord aRec = m_pTabModel->record(i); //获取当前记录        float salary = aRec.value("Salary").toFloat();        salary = salary * 1.1;        aRec.setValue("Salary", salary);        m_pTabModel->setRecord(i, aRec);    }    if (m_pTabModel->submitAll())        QMessageBox::information(this, "消息", "涨工资计算完毕", QMessageBox::Ok, QMessageBox::NoButton);}//字段列表void QGuiSql::actFields_triggered(){    QSqlRecord  emptyRec = m_pTabModel->record();//获取空记录，只有字段名    if (emptyRec.count() > 0)    {        QString  str;        for (int i = 0; i < emptyRec.count(); i++)            str = str + emptyRec.fieldName(i) + '\n';        QMessageBox::information(this, "所有字段名", str, QMessageBox::Ok, QMessageBox::NoButton);    }}//保存void QGuiSql::actSubmit_triggered(){    bool res = m_pTabModel->submitAll();    if (!res)        QMessageBox::information(this, "消息", "数据保存错误,错误信息\n" + m_pTabModel->lastError().text(),            QMessageBox::Ok, QMessageBox::NoButton);    else    {        ui.actSubmit->setEnabled(false);        ui.actRevert->setEnabled(false);    }}//取消void QGuiSql::actRevert_triggered(){    m_pTabModel->revertAll();    ui.actSubmit->setEnabled(false);    ui.actRevert->setEnabled(false);}//升序void QGuiSql::radioBtnAscend_clicked(){    //queryModel = new QSqlQueryModel(this);    //proxyModel = new QSortFilterProxyModel(this);    //queryModel->setQuery(sql);    //proxyModel->setSourceModel(queryModel);    //tableView->setModel(proxyModel);    m_pTabModel->setSort(ui.comboFields->currentIndex(), Qt::AscendingOrder);    m_pTabModel->select();}//降序void QGuiSql::radioBtnDescend_clicked(){    m_pTabModel->setSort(ui.comboFields->currentIndex(), Qt::DescendingOrder);    m_pTabModel->select();}//男过滤void QGuiSql::radioBtnMan_clicked(){    m_pTabModel->setFilter(" Gender='男' ");}//女过滤void QGuiSql::radioBtnWoman_clicked(){    m_pTabModel->setFilter(" Gender='女' ");}//男女过滤void QGuiSql::radioBtnBoth_clicked(){    m_pTabModel->setFilter("");}void QGuiSql::comboFields_currentIndexChanged(int index){    if (ui.radioBtnAscend->isChecked())        m_pTabModel->setSort(index, Qt::AscendingOrder);    else        m_pTabModel->setSort(index, Qt::DescendingOrder);    m_pTabModel->select();}

代理类

#pragma once#include class QComboBoxDelegate : public QItemDelegate{    Q_OBJECTpublic:    QComboBoxDelegate(QObject* parent = 0);    ~QComboBoxDelegate();    void    setItems(QStringList items, bool isEdit);//初始化设置列表内容，是否可编辑    //自定义代理组件必须继承以下4个函数    QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option,        const QModelIndex& index) const Q_DECL_OVERRIDE;    void setEditorData(QWidget* editor, const QModelIndex& index) const Q_DECL_OVERRIDE;    void setModelData(QWidget* editor, QAbstractItemModel* model,        const QModelIndex& index) const Q_DECL_OVERRIDE;    void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option,        const QModelIndex& index) const Q_DECL_OVERRIDE;private:    QStringList m_ItemList;//选择列表    bool    m_isEdit; //是否可编辑};#include "QComboBoxDelegate.h"#include QComboBoxDelegate::QComboBoxDelegate(QObject *parent)    : QItemDelegate(parent){}QComboBoxDelegate::~QComboBoxDelegate(){}void QComboBoxDelegate::setItems(QStringList items, bool isEdit){    m_ItemList = items;    m_isEdit = isEdit;}QWidget* QComboBoxDelegate::createEditor(QWidget* parent,    const QStyleOptionViewItem& option, const QModelIndex& index) const{    //QComboBox* editor = new QComboBox(parent);    //editor->addItem("优");    //editor->addItem("良");    //editor->addItem("一般");    //editor->addItem("不合格");    Q_UNUSED(option);    Q_UNUSED(index);    QComboBox* editor = new QComboBox(parent);    for (int i = 0; i < m_ItemList.count(); i++)   //从字符串列表初始下拉列表        editor->addItem(m_ItemList.at(i));    editor->setEditable(m_isEdit); //是否可编辑    return editor;}void QComboBoxDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const{    QString str = index.model()->data(index, Qt::EditRole).toString();    QComboBox* comboBox = static_cast(editor);    comboBox->setCurrentText(str);}void QComboBoxDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const{    QComboBox* comboBox = static_cast(editor);    QString str = comboBox->currentText();    model->setData(index, str, Qt::EditRole);}void QComboBoxDelegate::updateEditorGeometry(QWidget* editor,    const QStyleOptionViewItem& option, const QModelIndex& index) const{    editor->setGeometry(option.rect);}