Qt使用SqlLite实现权限管理

根据Sqlite轻量级数据库的优势，便于对于数据进行增删改查等操作。
本例模拟权限列表对不同界面进行权限管理，管理员针对不同人员进行权限设定，灵活性更高。
动态演示效果如下：

考虑数据库数据安全，可进行哈希散列值计算进行加密，Qt提供QCryptographicHash类进行数据加密，本例中使用的加密函数为：

QString SqlHelper::encode(QString str) {
	QString strPwdSha = "";
	if (str == "") {
		return "";
	}
	QByteArray bytePwd = str.toLatin1();
	QByteArray bytePwdSha = QCryptographicHash::hash(bytePwd, QCryptographicHash::Sha256);
	strPwdSha = bytePwdSha.toHex().toUpper();
	return strPwdSha;
}
QString SqlHelper::encodePwd(QString str) {
	if (str == "") {
		return "";
	}
	QString endata = encode(str);
	QString strdata = "";
	for (int i = 0; i < endata.size(); i++) {
		if (i % 4 == 0) {
			strdata += endata[i];
		}
	}
	return strdata + "SAP";
}

初始化数据库：

void SqlHelper::connectDataBase() {
	db = QSqlDatabase::addDatabase("QSQLITE", "sqlite1");// 驱动类型,连接名(默认)
	db.setDatabaseName("DbData/data.db");
	db.setHostName("localhost.");
	db.setUserName("root");
	db.setPassword("123456");
	m_DbState = db.open();
}

创建数据表：

void SqlHelper::IniSql() {
	QSqlQuery query(db);
	QString strCmd = QString("create table employee(employee_id varchar(64) primary key,"
		"employee_name varchar(64),employee_pass varchar(32),employee_settingrole varchar(16),"
		"employee_menurole varchar(16),employee_logrole varchar(16),employee_sex varchar(16))");
	query.prepare(strCmd);
	if (query.exec())
	{
		qDebug() << "----employee 数据库表：创建成功！";
		insertData("admin", "root", "root123456", 1,1,1,"male");
	}
	else {
		qDebug() << "----employee 数据表已经存在-----";
	}
}

插入数据：

bool SqlHelper::insertData(QString userid, QString username, QString userpass, int sflag, int mflag, int lflag, QString usersex) {
	if (!m_DbState) {
		return false;
	}
	QList list = queryAllInfo();
	m_mutex.lock();
	bool flag = false;
	//qDebug() << "m_id:  " << m_id;
	QSqlQuery query(db);
	QString str = QString("insert into employee values(?,?,?,?,?,?,?)");
	query.prepare(str);
	//query.bindValue(0, list.size() + 1);
	query.bindValue(0, userid);
	query.bindValue(1, username);
	QString pass = encodePwd(userpass);
	query.bindValue(2, pass);
	QString setrole = userid;
	setrole.append(QString::number(sflag));
	setrole = encodeRole(setrole,RoleType::SettingRole);
	query.bindValue(3, setrole);
	QString mrole = userid;
	mrole.append(QString::number(mflag));
	mrole = encodeRole(mrole, RoleType::MenuRole);
	query.bindValue(4, mrole);
	QString lrole = userid;
	lrole.append(QString::number(lflag));
	lrole = encodeRole(lrole, RoleType::LogRole);
	query.bindValue(5, lrole);
	query.bindValue(6, usersex);
		if (query.exec()) {
		qDebug() << "插入数据成功----";
		flag = true;
	}
	else {
		qDebug() << "插入数据失败----";
	}
	m_mutex.unlock();
	//qDebug() << "777777777777777777777777";
	return flag;
}

可使用结构体对数据信息进行封装：

struct employeeInfo {
	QString employee_id = "";
	QString employee_name;
	QString employee_pass;
	QString employee_settingrole;
	QString employee_menurole;
	QString employee_logrole;
	QString employee_sex;
}; 

数据库查询函数为：

QList SqlHelper::queryAllInfo() {
	QList list;
	if (!m_DbState) {
		return list;
	}
	m_mutex.lock();
	QSqlQuery query(db);
	QString str = "select * from employee";
	query.prepare(str);
	if (query.exec()) {
		while (query.next()) {
			//qDebug() << "name---" << query.value(1).toString() << " age-" << query.value(2).toInt();
			employeeInfo employee;
			employee.employee_id = query.value(0).toString();
			employee.employee_name = query.value(1).toString();
			employee.employee_pass = query.value(2).toString();
			employee.employee_settingrole = query.value(3).toString();
			employee.employee_menurole = query.value(4).toString();
			employee.employee_logrole = query.value(5).toString();
			employee.employee_sex = query.value(6).toString();
			list.append(employee);
		}
	}
	m_mutex.unlock();
	return list;
}
employeeInfo SqlHelper::queryOne(QString userid) {
	employeeInfo employee;
	if (!m_DbState) {
		return employee;
	}
	m_mutex.lock();
	QSqlQuery query(db);
	QString str = "select * from employee where employee_id =?";
	query.prepare(str);
	query.addBindValue(userid);
		if (query.exec()) {
		while (query.next()) {
			employee.employee_id = query.value(0).toString();
			employee.employee_name = query.value(1).toString();
			employee.employee_pass = query.value(2).toString();
			employee.employee_settingrole = query.value(3).toString();
			employee.employee_menurole = query.value(4).toString();
			employee.employee_logrole = query.value(5).toString();
			employee.employee_sex = query.value(6).toString();
		}
	}
	m_mutex.unlock();
	return employee;
}

数据库更新数据函数为：

bool SqlHelper::updateData(QString userid, QString username, QString userpass, int sflag ,int mflag, int lflag, QString usersex) {
	if (!m_DbState) {
		return false;
	}
	QSqlQuery query(db);
	QString str = "update employee set employee_name =?,employee_pass=?,"
		"employee_settingrole=?,employee_menurole=?,employee_logrole=? , employee_sex = ? where employee_id =?";
	query.prepare(str);
	query.addBindValue(username);
	QString ss = queryPass(userid);
	m_mutex.lock();
	bool flag = false;
	if (ss == userpass) {
		query.addBindValue(ss);
	}
	else {
		userpass = encodePwd(userpass);
		query.addBindValue(userpass);
	}
	QString nsr = userid;
	nsr.append(QString::number(sflag));
	nsr = encodeRole(nsr, RoleType::SettingRole);
	query.addBindValue(nsr);
	QString nmr = userid;
	nmr.append(QString::number(mflag));
	nmr = encodeRole(nmr, RoleType::MenuRole);
	query.addBindValue(nmr);
	QString nlr = userid;
	nlr.append(QString::number(lflag));
	nlr = encodeRole(nlr, RoleType::LogRole);
	query.addBindValue(nlr);
	query.addBindValue(usersex);
	query.addBindValue(userid);
	if (query.exec()) {
		flag = true;
		qDebug() << "更新成功---";
	}
	else {
		flag = false;
		qDebug() << "更新失败---";
	}
	m_mutex.unlock();
	return flag;
}

删除数据函数为：

bool SqlHelper::deleteData(QString userid) {
	if (!m_DbState) {
		return false;
	}
	employeeInfo one = queryOne(userid);
	if (one.employee_id == "") {
		qDebug() << "此人已删除----";
		return false;
	}
	m_mutex.lock();
	bool flag = false;
	QSqlQuery query(db);
	QString str = "delete from employee where employee_id=?";
	query.prepare(str);
	query.addBindValue(userid);
	if (query.exec()) {
		flag = true;
		qDebug() << "删除成功---";
	}
	else {
		flag = false;
		qDebug() << "删除失败---";
	}
	m_mutex.unlock();
	return flag;
}