Qt 创建 SQlite数据库
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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<studentInfo> 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
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#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<department> tmpDept; // 数据库缓存 sql_query.exec("SELECT * FROM ");} |
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原文链接：https://blog.csdn.net/weixin_43232564/article/details/123724923
