我正在使用以下示例https://wiki.qt.io/How_to_Use_a_QSqlQueryModel_in_QML。它使用QSqlQueryModel并选择列名列表。但就我而言,我不知道输出中的表列名称,因为我正在使用 *
query "Select * from users"
。如何在 Qml的TableView中打印数据。
我的代码如下:
QtTest2.cpp
QtTest2::QtTest2(QObject *parent) :
QSqlQueryModel(parent)
{
}
void QtTest2::setQuery(const QString &query, const QSqlDatabase &db)
{
QSqlQueryModel::setQuery(query, db);
generateRoleNames();
}
void QtTest2::setQuery(const QSqlQuery & query)
{
QSqlQueryModel::setQuery(query);
generateRoleNames();
}
void QtTest2::generateRoleNames()
{
m_roleNames.clear();
for( int i = 0; i < record().count(); i ++) {
m_roleNames.insert(Qt::UserRole + i + 1, record().fieldName(i).toUtf8());
}
}
QVariant QtTest2::data(const QModelIndex &index, int role) const
{
QVariant value;
if(role < Qt::UserRole) {
value = QSqlQueryModel::data(index, role);
}
else {
int columnIdx = role - Qt::UserRole - 1;
QModelIndex modelIndex = this->index(index.row(), columnIdx);
value = QSqlQueryModel::data(modelIndex, Qt::DisplayRole);
}
return value;
}
void QtTest2::callSql()
{
this->setQuery("SELECT * FROM users");
}
qml文件
import QtQuick 2.12
import QtQuick.Controls 2.4
import QtQuick.Layouts 1.3
Page {
id : somepageid
Component.onCompleted: {
QtTest2.callsql();
}
TableView {
id: tableView
model: QtTest2
// This is for header
Row {
id: columnsHeader
y: tableView.contentY
z: 2
Repeater {
model: tableView.columns > 0 ? tableView.columns : 1
Label {
width: tableView.columnWidthProvider(modelData)
height: 35
text: QtTest2.headerData(modelData, Qt.Horizontal)
color: '#aaaaaa'
font.pixelSize: 15
padding: 10
verticalAlignment: Text.AlignVCenter
background: Rectangle { color: "#333333" }
}
}
}
// Here I cannot print the values dynamically.
// Currently this is printing the email (e.g.), in all columns in a row
// But yes, each row prints different email
// I want the rest of the column data dynamically printed
delegate:Rectangle {
Text {
text: email
anchors.fill: parent
anchors.margins: 10
color: 'black'
font.pixelSize: 15
verticalAlignment: Text.AlignVCenter
}
}
}
编辑
我已经调用了engine.rootContext()->setContextProperty("QtTest2", &qttest2);
main.cpp