QT 運算元據庫SQLite例項

#include "widget.h"

qsqlquery query(dbconn);//以下執行相關qsl語句
//新建student表，id設定為主鍵，還有乙個name項
query.exec("create table student(id varchar,name varchar)");
query.exec(qobject::tr("insert into student values(1,'李剛')"));
query.exec(qobject::tr("insert into student values(2,'蘋果')"));
query.exec(qobject::tr("insert into student values(3,'葡萄')"));
query.prepare("insert into student values(?,?)");
qvariantlist ids;
ids << 4 << 5 << 6;
query.addbindvalue(ids);
qvariantlist names;
names << "kevin" << "xiang" << "jie";
query.addbindvalue(names);
if( !query.execbatch() )
qdebug() << "error: " << query.lasterror();
query.exec("update student set name='xiangjie' where id=5"); //更新
query.exec("delete from student where id=6"); //刪除
"select id,name from student where id>=2");
query.exec("select * from student");
while(query.next())指向查詢到的第一條記錄，然後每次後移一條記錄
query.seek(3);
qsqlrecord record = query.record(); //獲取當前行記錄
qdebug() << "id: " << record.value("id").toint() << " name: " << record.value("name").tostring();
qsqlfield field = record.field(1);  //獲取索引字段
qdebug() << "field name:" << field.name() << " field value:" << field.value().tostring();
query.exec(qobject::tr("drop table student")); //刪除table
//return a.exec();
}

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