qt sqlite数据库操作

青旅半醒 2022-06-15 09:17 337阅读 0赞

**\*\*\*\***\*Qt 提供了与平台以及数据库种类无关的访问SQL数据库的接口， QSqlDatabase对象象征了数据库的关联。下面就qt 操作sqlite3数据库做总结。**\*\*\*\***\*

**首先，在新建一个工程之后，在pro文件中做修改：QT += core gui concurrent sql multimedia**

包含头文件

\#include <QtSql/QSqlDatabase>

\#include <QtSql/QSqlQuery>

\#include <QtSql/QSqlError>

\#include <QtSql/QSqlRecord>

定义：

const QString dbName = "QSqlite.db"; //数据库名

const QString tableName = "student"; //数据表名

**连接数据库**

QSqlDatabase::addDatabase("QSQLITE");

**创建数据库**

//如果该数据库不存在则会创建

QSqlDatabase db = QSqlDatabase::database();

db.setDatabaseName(dbName);

if( !db.open())\{

return false;

return true;

**2.创建数据表**

if(!QSqlDatabase::database().record(tableName).isEmpty() )

//若数据表存在则返回

QMessageBox::about(NULL,"create student","the table student has existed");

return;

QSqlQuery query; bool ok = query.exec("CREATE TABLE " +tableName +"(" //创建表

"id INTEGER PRIMARY KEY,"

"name VARCHAR(30),"

"age int,"

"address VARCHAR(30),"

"IDNum int,"

"school VARCHAR(30)"

")"

);

if(!ok)\{

errMsg = QSqlDatabase::database().lastError().text();

QMessageBox::warning(NULL,"create student",errMsg);

**3.增**

QSqlQuery query;

//做准备

bool ok = query.prepare("INSERT INTO student"

"(name,age,address,IDNum,school)"

"VALUES"

"(:name,:age,:address,:IDNum,:school)"

);

if( !ok )\{

errMsg = QSqlDatabase::database().lastError().text();

QMessageBox::warning(NULL,"prepare:","*\*\*\**"+errMsg);

//绑定数据

query.bindValue(":name",“张三”);

query.bindValue(":age",20);

query.bindValue(":address",“北京”);

query.bindValue(":IDNum",1234567890);

query.bindValue(":school",“北大附中”);

//执行该操作

if( !query.exec())\{

errMsg = QSqlDatabase::database().lastError().text();

QMessageBox::warning(NULL,"insert student","---"+errMsg);

**4.删**

QSqlQuery query;

QString dlCondition = "”删除的条件";

bool ok = query.exec("DELETE FROM student WHERE "+dlCondition);

if( !ok )\{

errMsg = QSqlDatabase::database().lastError().text();

QMessageBox::warning(NULL,"delete:",errMsg);

**5.改**

QSqlQuery query;

//将name含有三的人的 age改为50.

bool ok = query.exec("UPDATE student SET age=50 WHERE name like '%三'");

if( !ok )\{

errMsg = QSqlDatabase::database().lastError().text();

QMessageBox::warning(NULL,"update:",errMsg);

**6.查**

QString sqlCon = "查询的条件";

QString sqlCmd = QString("SELECT \* FROM %1 WHERE %2").arg(tableName).arg(sqlCon);

QSqlQuery query(sqlCmd);

while(query.next())\{ //将查询的结果取出来

QString temp 1= query.value(0).toString()；

QString temp 2 = query.value(1).toString();

QString temp 3 = query.value(2).toString(); //参数可以理解为数据表的列号

qt sqlite数据库操作

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