#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>

// 初始化表結(jié)構(gòu)
// https://www.cnblogs.com/lyshark
bool InitSQL()
{
    // 指定數(shù)據(jù)庫(kù)驅(qū)動(dòng)類(lèi)型
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return false;
     }

    // 執(zhí)行SQL創(chuàng)建表
    db.exec("DROP TABLE LyShark");
    db.exec("CREATE TABLE LyShark ("
                    "id INTEGER PRIMARY KEY AUTOINCREMENT, "
                    "name VARCHAR(40) NOT NULL, "
                    "age INTEGER NOT NULL)"
         );

    // 提交事務(wù)請(qǐng)求
    bool ref = db.commit();
    db.close();
    return ref;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    bool ref = InitSQL();
    std::cout << "init: " << ref << std::endl;

    return a.exec();
}

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>

// 逐條插入數(shù)據(jù)
// https://www.cnblogs.com/lyshark
bool InsertSQL()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return false;
     }

     // 逐條插入數(shù)據(jù)
     db.exec("INSERT INTO LyShark(name,age) ""VALUES ('admin',23)");
     db.exec("INSERT INTO LyShark(name,age) ""VALUES ('zhangsan',25)");
     db.exec("INSERT INTO LyShark(name,age) ""VALUES ('lisi',34)");

     // 提交數(shù)據(jù)
     bool ref = db.commit();
     return ref;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    bool ref = InsertSQL();
    std::cout << "insert = > " << ref << std::endl;

    return a.exec();
}

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>

// 批量插入數(shù)據(jù)
// https://www.cnblogs.com/lyshark
bool InsertMultipleSQL()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
    if (!db.open())
    {
           std::cout << db.lastError().text().toStdString()<< std::endl;
           return false;
    }

    // 定義字符串鏈表
    QStringList user_name;
    QStringList user_age;

    // 批量插入數(shù)據(jù)到鏈表中
    user_name << "www.lyshark.com" << "https://www.cnblogs.com/lyshark" << "lyshark";
    user_age << "22" << "33" << "44";

    // 綁定數(shù)據(jù)記錄
    QSqlQuery query;
    query.prepare("INSERT INTO LyShark(name,age) ""VALUES (:name, :age)");

    // 判斷兩張表中字段數(shù)據(jù)量是否一致
    if(user_name.size() == user_age.size())
    {
        // 循環(huán)插入數(shù)據(jù)
        for(int x=0;x< user_name.size(); x++)
        {
            query.bindValue(":name",user_name[x]);
            query.bindValue(":age",user_age[x]);
            query.exec();
        }
    }
    // 提交數(shù)據(jù)
    db.commit();
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    bool ref = InsertMultipleSQL();
    std::cout << "insert = > " << ref << std::endl;

    return a.exec();
}

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>

// 查詢(xún)數(shù)據(jù)記錄
// https://www.cnblogs.com/lyshark
bool SelectSQL()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return false;
     }

     // 查詢(xún)數(shù)據(jù)
     QSqlQuery query("SELECT * FROM LyShark;",db);
     QSqlRecord rec = query.record();

     // 循環(huán)所有記錄
     while(query.next())
     {
         // 判斷當(dāng)前記錄是否有效
         if(query.isValid())
         {
             int id_ptr = rec.indexOf("id");
             int id_value = query.value(id_ptr).toInt();

             int name_ptr = rec.indexOf("name");
             QString name_value = query.value(name_ptr).toString();

             int age_ptr = rec.indexOf("age");
             int age_value = query.value(age_ptr).toInt();

             std::cout << "ID: " << id_value << "Name: " << name_value.toStdString() << "Age: " << age_value << std::endl;
         }
     }
     return true;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    bool ref = SelectSQL();
    std::cout << "select = > " << ref << std::endl;

    return a.exec();
}

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <iostream>
#include <QStringList>
#include <QString>
#include <QVariant>

// 修改表中數(shù)據(jù)
// https://www.cnblogs.com/lyshark
bool UpdateSQL(QString uid, QString new_name)
{
    // 指定數(shù)據(jù)庫(kù)驅(qū)動(dòng)類(lèi)型
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("./lyshark.db");
     if (!db.open())
     {
            std::cout << db.lastError().text().toStdString()<< std::endl;
            return false;
     }

    // 執(zhí)行SQL更新記錄
    QString sql = QString("update LyShark set name='%1' where id=%2;").arg(new_name).arg(uid);
    db.exec(sql);
    std::cout << "update => " << sql.toStdString() << std::endl;

    // 提交事務(wù)請(qǐng)求
    bool ref = db.commit();
    db.close();
    return true;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 更新ID=6的記錄更新為 www.cnblogs.com/lyshark
    bool ref = UpdateSQL("6","www.cnblogs.com/lyshark");
    std::cout << "update flag: " << ref << std::endl;

    return a.exec();
}