QT+SQLite3 基础

环境：DebianGNU/Linux8.1

QT版本：Qt Creator 3.2.1 Based on Qt 5.3.2(GCC 4.9.2,32bit)

SQLite可视化软件：sqlitebrowser

.pro文件加上

QT += sql

#include<QtSql>

    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("DB.db");
    if(!db.open())
    {
        qDebug() << "database open failed!";
        return ;
    }


    QSqlQuery query;

    query.exec("create table student(id varchar,name varchar)");
    query.exec(QObject::tr("insert into student values(1,'Rachel')"));
    query.exec(QObject::tr("insert into student values(2,'Phoebe')"));
    query.exec(QObject::tr("insert into student values(3,'Monica')"));
    query.exec(QObject::tr("insert into student values(4,'Chandler')"));
    query.exec(QObject::tr("insert into student values(5,'张三')"));
    query.exec(QObject::tr("insert into student values(6,'李四')"));
    query.exec(QObject::tr("insert into student values(7,'王五')"));
    query.exec(QObject::tr("insert into student values(8,'赵四')"));
    query.exec(QObject::tr("insert into student values(9,'赵五')"));
    query.exec(QObject::tr("insert into student values(10,'赵六')"));

    query.exec("select id,name from student where id>=1");
    while(query.next())
    {
        int ele0=query.value(0).toInt();
        QString ele1 = query.value(1).toString();
        qDebug() << ele0 << " " << ele1;
    }

（2）建数据库、建表（主键自增）、插入数据、读取数据

    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("DB.db");
    if(!db.open())
    {
        qDebug() << "database open failed!";
        return ;
    }


    QSqlQuery query;

    query.exec("create table student(id INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT NOT NULL)");
    query.exec(QObject::tr("insert into student values(NULL,'Rachel')"));
    query.exec(QObject::tr("insert into student values(NULL,'Phoebe')"));
    query.exec(QObject::tr("insert into student values(NULL,'Monica')"));
    query.exec(QObject::tr("insert into student values(NULL,'Chandler')"));
    query.exec(QObject::tr("insert into student values(NULL,'张三')"));
    query.exec(QObject::tr("insert into student values(NULL,'李四')"));
    query.exec(QObject::tr("insert into student values(NULL,'王五')"));
    query.exec(QObject::tr("insert into student values(NULL,'赵四')"));
    query.exec(QObject::tr("insert into student values(NULL,'赵五')"));
    query.exec(QObject::tr("insert into student values(NULL,name from student where id>=1");
    while(query.next())
    {
        int ele0=query.value(0).toInt();
        QString ele1 = query.value(1).toString();
        qDebug() << ele0 << " " << ele1;
    }

（编辑：李大同）

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