程序運(yùn)行截圖如下：

代碼如下：

connection.h

#ifndef CONNECTION_H #define CONNECTION_H#include <QMessageBox> #include <QSqlQuery> #include <QSqlQuery> #include <QSqlDatabase>static bool createConnection(){QSqlDatabase db1=QSqlDatabase::addDatabase("QSQLITE","connection1");db1.setDatabaseName("my1.db");if(!db1.open()){QMessageBox::critical(NULL,"提示","數(shù)據(jù)庫打開失敗！");return false;}QSqlQuery query(db1);query.exec("create table student (id int primary key, ""name varchar(20))");query.exec("insert into student values(0, 'LiMing')");query.exec("insert into student values(1, 'LiuTao')");query.exec("insert into student values(2, 'WangHong')");return true; }#endif // CONNECTION_H

main.cpp

#include <QApplication> #include <QDebug> #include <QSqlDatabase> #include <QStringList> #include <QSqlRecord> #include <QSqlField> #include <QSqlDriver> #include <QSqlError> #include "connection.h"int main(int argc, char *argv[]) {QApplication a(argc, argv);if(!createConnection()){qDebug()<<"連接失敗!";return 1;}QSqlDatabase db1=QSqlDatabase::database("connection1");QSqlQuery query(db1);qDebug()<<"connection1:";query.exec("select * from student");while(query.next()){qDebug()<<query.value(0).toInt()<<query.value(1).toString();}int numRows;//獲取行號(hào)if(db1.driver()->hasFeature(QSqlDriver::QuerySize)){qDebug()<<"QSqlDriver::QuerySize";numRows=query.size();}else{qDebug()<<"unQSqlDriver::QuerySize";query.last();numRows=query.at()+1;}qDebug()<<"row number:"<<numRows;//指向索引query.seek(1);qDebug()<<"current index:"<<query.at();qDebug()<<"current data:"<<query.value(0).toInt()<<query.value(1).toString();//獲取當(dāng)前行的記錄QSqlRecord record=query.record();int id=record.value("id").toInt();QString name=record.value("name").toString();qDebug()<<"id:"<<id<<"name:"<<name;//獲取索引為1的字段，即第二個(gè)字段QSqlField field=record.field(1);qDebug()<<"second field:"<<field.name()<<"field value:"<<field.value().toString();//SQL查詢 方式1：query.prepare("insert into student (id,name) values (:id,:name)");int idValue=100;QString nameValue="CSDN IT1995";query.bindValue(":id",idValue);query.bindValue(":name",nameValue);query.exec("select * from student");while(query.next()){qDebug()<<query.value(0).toInt()<<query.value(1).toString();}//SQL查詢 方式2：query.prepare("insert into student (id,name) values (?,?)");int idValue1=101;QString nameValue1="CSDN IT1995 two";query.addBindValue(idValue1);query.addBindValue(nameValue1);query.exec();query.exec("select * from student");while(query.next()){qDebug()<<query.value(0).toInt()<<query.value(1).toString();}//SQL查詢 方式3：query.prepare("insert into student (id,name) values (?,?)");QVariantList ids;ids<<20<<21<<22;query.addBindValue(ids);QVariantList names;names<<"球球"<<"腿腿"<<"閏土";query.addBindValue(names);if(!query.execBatch())qDebug()<<query.lastError();query.exec("select * from student");while(query.next()){qDebug()<<query.value(0).toInt()<<query.value(1).toString();}return a.exec(); }

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