mysql> create database test
    -> default character set utf8
    -> default collate utf8_general_ci;

create table tbl(a text);

QTextCodec *c = QTextCodec::codecForName("UTF-8");
db().exec("SET NAMES 'utf8'");		
db().exec(QString("INSERT INTO tbl VALUES('%1')")
	.arg(c->fromUnicode(m_Le->text()).constData()));

db().exec("SET NAMES 'utf8'");		
db().exec(QString("INSERT INTO tbl VALUES('%1')").arg(m_Le->text()));