Qt怎么创建SQlite数据库

今天小编给大家分享一下Qt怎么创建SQlite数据库的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

Qt 创建 SQlite数据库

void Widget::initDB(){    // 创建并打开数据库    QSqlDatabase database;    database = QSqlDatabase::addDatabase("QSQLITE");//    qDebug() << QApplication::applicationDirPath(); // 获取应用程序当前目录    database.setDatabaseName("test.sqlite3");    if(!database.open())    {        qDebug() << "Error: Failed to connect database." << database.lastError();    }    else    {        qDebug() << "Succeed to connect database.";    }    // 创建表格    QSqlQuery sql_query = database.exec("DROP TABLE student");    // 先清空一下表，可按需添加此句//    sql_query.exec("DROP TABLE student");    // 创建表格student    if(!sql_query.exec("create table student(UserId int primary key, UserName text, PassWord text)"))    {        qDebug() << "Error: Fail to create table." << sql_query.lastError();    }    else    {        qDebug() << "Table created!";    }    // 填充表    if(!sql_query.exec("INSERT INTO student VALUES(1, 'AppleCai', '23')"))    {        qDebug() << "Error: Fail to create table." << sql_query.lastError();    }    else    {        qDebug() << "add one created!";    }    // 批量填充表    QStringList names;    names << "小A" << "小B" << "小C" << "小D" << "小E" << "小F" << "小G" << "小H" << "小I";    QStringList password;    password << "12" << "23" << "34" << "45" << "56" << "67" << "78" << "89" << "90";    // 绑定关键字后才能进行操作    sql_query.prepare("INSERT INTO student (UserId, UserName, PassWord) "                      "VALUES (:UserId, :UserName, :PassWord)");    qint8 i = 0;    foreach (QString name, names) // 从names表里获取每个名字    {        sql_query.bindValue(":UserId", i+2); // 向绑定值里加入名字        sql_query.bindValue(":UserName", name); // 成绩        sql_query.bindValue(":PassWord", password[i]); // 班级        if(!sql_query.exec())        {            qDebug() << "Error: Fail." << sql_query.lastError();        }        i++;    }    // 读取sqlite    studentInfo tmp;    QVector infoVect; // 数据库缓存    sql_query.exec("SELECT * FROM student WHERE UserId >= 5 AND UserId <= 9;");    while (sql_query.next())    {        tmp.UserId = sql_query.value(0).toInt();        tmp.UserName = sql_query.value(1).toString();        tmp.Password = sql_query.value(2).toString();        qDebug() << tmp.UserId << tmp.UserName << tmp.Password;        infoVect.push_back(tmp);    }    qDebug("done");    // 更改表中数据    sql_query.prepare("UPDATE student SET PassWord = 'admin' WHERE UserName = 'AppleCai'");    if(!sql_query.exec())    {        qDebug() << "Error: Fail." << sql_query.lastError();    }    // 删除表中数据    sql_query.prepare("DELETE FROM student WHERE UserName = '小H'");    if(!sql_query.exec())    {        qDebug() << "Error: Fail." << sql_query.lastError();    }}

以下是个人代码备份

这个代码是在qt写的，包含了数据库的创建和写入，但是我在项目准备直接在dataGrip把数据一键导入创建好数据库之后再用qt里面的sql语句读，所以就不需要这一部分了

#include "sqlitedatabase.h"SqliteDatabase::SqliteDatabase(){    qDebug() << "hhh";//    initPickNameDB();}void SqliteDatabase::initPickNameDB(){    // 创建并打开数据库    QSqlDatabase database;    database = QSqlDatabase::addDatabase("QSQLITE");//    qDebug() << QApplication::applicationDirPath();    database.setDatabaseName(QApplication::applicationDirPath() + "/CONFIG/" + "PickNameDB.sqlite3");    if(!database.open())    {        qDebug() << "Error: Failed to connect database." << database.lastError();    }    else    {        qDebug() << "Succeed to connect database.";    }    // 创建表格 先清空一下表    QSqlQuery sql_query = database.exec("DROP TABLE department");    sql_query = database.exec("DROP TABLE person");    if(!sql_query.exec("create table department (Id int primary key not null, "                       "DeptName vchar(50) not null )"))    {        qDebug() << "Error: Fail to create department table." << sql_query.lastError();    }    else    {        qDebug() << "Department table created!";    }    if(!sql_query.exec("create table person (Id int primary key not null , "                       "DeptID integer not null , "                       "PerName vchar(50) not null, "                       "foreign key(DeptID) references department (Id))"))    {        qDebug() << "Error: Fail to create person table." << sql_query.lastError();    }    // 填充表//    sql_query.exec("insert into department (id, name) values (1, '办领导')");//    sql_query.exec("insert into department (id, name) values (2, '综合处')");//    sql_query.exec("insert into department (id, name) values (3, '政策法规处')");//    sql_query.exec("insert into department (id, name) values (4, '机构改革处')");//    sql_query.exec("insert into department (id, name) values (5, '党群政法行政机构编制管理处')");//    sql_query.exec("insert into department (id, name) values (6, '政府行政机构编制管理处')");//    sql_query.exec("insert into department (id, name) values (7, '市县行政机构编制管理处')");//    sql_query.exec("insert into department (id, name) values (8, '事业机构编制管理处')");//    sql_query.exec("insert into department (id, name) values (9, '事业单位登记管理处')");//    sql_query.exec("insert into department (id, name) values (10, '机构编制监督检查处')");//    sql_query.exec("insert into department (id, name) values (11, '人事处')");//    sql_query.exec("insert into department (id, name) values (12, '机关党委')");//    sql_query.exec("insert into department (id, name) values (13, '省机构编制电子政务中心')");//    sql_query.exec("insert into department (id, name) values (14, '省机构编制研究中心')");    // 批量填充表    QStringList deptNames;    deptNames << "办领导" << "综合处" << "政策法规处" << "机构改革处"              << "党群政法行政机构编制管理处" << "政府行政机构编制管理处"              << "市县行政机构编制管理处" << "事业机构编制管理处" << "事业单位登记管理处"              << "机构编制监督检查处" << "人事处" << "机关党委"              << "省机构编制电子政务中心" << "省机构编制研究中心";    // 绑定关键字后才能进行操作    sql_query.prepare("INSERT INTO department (Id, DeptName) "                      "VALUES (:Id, :DeptName)");    qint8 i = 0;    foreach (QString deptName, deptNames)    {        sql_query.bindValue(":Id", i + 1);        sql_query.bindValue(":DeptName", deptName);        if(!sql_query.exec())        {            qDebug() << "Error: Fail." << sql_query.lastError();        }        i++;    }    // 读取sqlite    department dept;    QVector tmpDept; // 数据库缓存    sql_query.exec("SELECT * FROM ");}

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