效果预览：
一、准备好对应的 QSqlTableModel
#ifndef LOCALMUSICMODEL_H
#define LOCALMUSICMODEL_H
#include <QObject>
#include <QSqlTableModel>
#include <QMediaPlayer>
#include "libzplay.h"
using namespace libZPlay;
struct songInfo
{
QString Artist;
QString title;
QString album;
qint32 duration = 0;
QString path;
};
class LocalMusicModel : public QSqlTableModel
{
Q_OBJECT
Q_PROPERTY(int m_musicNum READ musicNum WRITE setMusicNum NOTIFY musicNumChanged)
public:
explicit LocalMusicModel(QObject *parent = nullptr);
QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;
QHash<int, QByteArray> roleNames() const Q_DECL_OVERRIDE;
Q_INVOKABLE void reloadMusicRecord(const QString &path);
int musicNum(){return m_musicNum;}
void setMusicNum(int val){
m_musicNum = val;
emit musicNumChanged();
}
signals:
void musicNumChanged();
private:
void parseMusicInfo(QString path);
void clearDb();
private:
ZPlay *player;
int m_musicNum = 0;
};
#endif // LOCALMUSICMODEL_H#include "localmusicmodel.h"
#include <QDateTime>
#include <QSqlRecord>
#include <QDebug>
#include <QSqlError>
#include <QSqlQuery>
#include <QDir>
static const char *localMusicTableName = "LocalMusicInfo";
static void createTable()
{
if (QSqlDatabase::database().tables().contains(localMusicTableName)) {
// The table already exists; we don't need to do anything.
return;
}
QSqlQuery query;
QString sql_ = QStringLiteral("CREATE TABLE IF NOT EXISTS [LocalMusicInfo] ( \
[title] VARCHAR2 , \
[singer] VARCHAR2 , \
[album] VARCHAR2 , \
[duration] INTEGER ,\
[path] VARCHAR2 NOT NULL , \
UNIQUE([path]) ON CONFLICT REPLACE \
)");
if (!query.exec(sql_)) {
qFatal("Failed to query database: %s", qPrintable(query.lastError().text()));
}
//query.exec("INSERT INTO LocalMusicInfo VALUES('title', 'singer', 'album', 123,'c://')");
}
LocalMusicModel::LocalMusicModel(QObject *parent)
: QSqlTableModel(parent)
{
createTable();
setTable(localMusicTableName);
/*可以看到这个模型很强大，而且完全脱离了SQL语句，就算你不怎么懂数据库，
* 也可以利用它进行大部分常用的操作。这个模型提供了缓冲区，可以将所有修改先保存到model中，
* 只有当我们执行提交修改后，才会真正写入数据库。当然这也是因为我们在最开始设置了它的保存策略：
submitAll(); revertAll();*/
setEditStrategy(QSqlTableModel::OnManualSubmit);
select();
player = CreateZPlay();
setMusicNum(this->rowCount());
}
QVariant LocalMusicModel::data(const QModelIndex &index, int role) const
{
if (role < Qt::UserRole)
return QSqlTableModel::data(index, role);
const QSqlRecord sqlRecord = record(index.row());
//qDebug() << sqlRecord.value(role - Qt::UserRole);
switch (role) {
case Qt::UserRole:
if(sqlRecord.value(0).toString().isEmpty())
{
QString path = sqlRecord.value(role - Qt::UserRole + 4).toString();
path = path.right(path.lastIndexOf('/'));
path.chop(4);
return path.simplified();
}
break;
case Qt::UserRole+1:
if(sqlRecord.value(1).toString().isEmpty())
return tr("未知歌手");
break;
case Qt::UserRole+2:
if(sqlRecord.value(2).toString().isEmpty())
return tr("未知专辑");
break;
case Qt::UserRole+3:
int time = sqlRecord.value(3).toInt();
return QString("%1:%2").arg(time/60).arg(time%60,2,10,QChar('0'));
}
return sqlRecord.value(role - Qt::UserRole);
}
QHash<int, QByteArray> LocalMusicModel::roleNames() const
{
QHash<int, QByteArray> names;
names[Qt::UserRole] = "title";
names[Qt::UserRole + 1] = "singer";
names[Qt::UserRole + 2] = "album";
names[Qt::UserRole + 3] = "duration";
names[Qt::UserRole + 4] = "path";
return names;
}
void LocalMusicModel::reloadMusicRecord(const QString &path_)
{
parseMusicInfo(path_);
}
//获取指定目录下所有歌曲信息
void LocalMusicModel::parseMusicInfo(QString path)
{
QList<songInfo> songRecords;
QStringList dirList=path.split(",");
QString temp;
foreach (temp, dirList) {
temp=temp.right(temp.length()-8);
QDir dir(temp);
dir.setNameFilters(QStringList() << "*.mp3" << "*.flac" << "*.wav");
QFileInfoList fileList=dir.entryInfoList();
QFileInfo fileInfo;
foreach (fileInfo, fileList) {
TID3InfoEx id3_info;
//如果直接使用LoadFileID3Ex函数，会得不到时长信息
if(player->OpenFile((const char*) fileInfo.absoluteFilePath().toLocal8Bit(),sfAutodetect))
if(player->LoadID3Ex(&id3_info,1))
{
songInfo tempSongInfo;
tempSongInfo.title = QString::fromLocal8Bit(id3_info.Title); //音乐标题
tempSongInfo.Artist = QString::fromLocal8Bit(id3_info.Artist); //歌手
tempSongInfo.path = fileInfo.absoluteFilePath(); //路径
tempSongInfo.album = QString::fromLocal8Bit(id3_info.Album); //专辑
// get stream info,获取时长信息
TStreamInfo pInfo;
player->GetStreamInfo(&pInfo);
tempSongInfo.duration =pInfo.Length.sec;
songRecords.append(tempSongInfo);
}
else
{
qDebug() << QString("No ID3 data:%1\r\n\r\n").arg(QString::fromLocal8Bit(player->GetError()));
}
else
{
qDebug() << "LoadID3Ex faild";
}
}
}
clearDb();
QSqlRecord newRecord = record();
for(auto songItem : songRecords)
{
newRecord.setValue("title", songItem.title);
newRecord.setValue("singer", songItem.Artist);
newRecord.setValue("album", songItem.album);
newRecord.setValue("duration", songItem.duration);
newRecord.setValue("path", songItem.path);
if (!insertRecord(rowCount(), newRecord)) {
qWarning() << "Failed to send message:" << lastError().text();
return;
}
}
submitAll();//提交数据库
setMusicNum(songRecords.size());
}
void LocalMusicModel::clearDb()
{
if (!QSqlDatabase::database().tables().contains(localMusicTableName)) {
createTable();
}
QSqlQuery query;
QString sql_ = QStringLiteral("delete from [LocalMusicInfo]");
if (!query.exec(sql_)) {
qFatal("Failed to query database: %s", qPrintable(query.lastError().text()));
}
qDebug() << "clear table ok";
}重点是
QHash<int, QByteArray> roleNames() const Q_DECL_OVERRIDE;QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;给你需要的数据设置好role，方便qml进行调用。
二、qml调用
main.cpp
qmlRegisterType<LocalMusicModel>("io.qt.CloudMusic", 1, 0, "LocalMusicModel");qml：
import io.qt.CloudMusic 1.0LocalMusicModel{
id:localmusic;} TableView{
id: tableview
anchors.fill: parent
visible: localmusic.m_musicNum >0
backgroundVisible: false;
frameVisible: false;
//itemDelegate: StandardTabelItemDelegate{} //代理
//headerDelegate: headerDele; //表头委托
//rowDelegate: rowDele; //行委托
model: localmusic
TableViewColumn {
role: "title"
title: qsTr("标题")
width: 300
}
TableViewColumn {
role: "singer"
title: qsTr("歌手")
width: 300
}
TableViewColumn {
role: "album"
title: qsTr("专辑")
width: 300
}
TableViewColumn {
role: "duration"
title: qsTr("时长")
width: 300
}
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