Qt/C++ 数据库SQL 增删改查 语句示例

注:文中例子均使用QSQLITE

一，增  

QSqlQuery query;query.prepare(QString("INSERT INTO playList%1(songname,songurl,duration)"

                          "VALUES (:songname, :songurl,:duration)").arg(m_objIndex));

    query.bindValue(":songname", songname);

    query.bindValue(":songurl", url);

    query.bindValue(":duration", dur);

    query.exec(); 

二，删

 QSqlQuery query;

        query.prepare(QString("DELETE FROM playlistname WHERE listname = ?"));

        query.addBindValue(name);

         query.exec();

三，改

 query.prepare("update playlistname set listname = ? where listname = ?");

    query.addBindValue(newname);

    query.addBindValue(oldname);

    query.exec();

四，查

QSqlQuery query1(QString("SELECT * FROM playList%1").arg(m_objIndex));

    int fieldNo = query1.record().indexOf("songname");

    while (query1.next()) {

        QString name = query1.value(fieldNo).toString();

          list1<

    }

mfc的

常用SQL语句
查询语句sql.Format("select * from xsxx where name='%s'",m_user1)
表示从 xsxx表中 选择 name=m_user1这一列 
添加语句
sql.Format("insert into xsxx(name,sex,age,num) values('%s','%s','%s','%s')",m_user1,m_user2,m_user3,m_user4);
删除语句
sql.Format("delete from xsxx where name='%s'",m_user);
修改语句
sql.Format("update xsxx set num='%s',age='%s',sex='%s' where name='%s'",m_user4,m_user3,m_user2,m_user1);

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