qsqlquery'参数计数不匹配'
我正在尝试从表单上的六个字段中获取数据,并将用户输入数据库(本地SQLITE3数据库)传递数据。 ID是一个整数,主键,其余的是足够长的Varchars。在阅读了许多相关问题之后,我仍然无法弄清楚我的代码在哪里出错。我已经确认该程序已连接到数据库,但是我继续获得“参数计数不匹配”。我要去哪里?我正在使用QT 5.15和C ++。存在表工具,因为我在SQLite Manager中打开了它,并且已经插入了测试行。
以下是应该提交数据的功能:
//passes data to database upon clicking submit button
void Add_item::on_submitButton_clicked() {
QString name, location, safety, summary, uses, idNumber;
idNumber = ui->testIdBox->text();
name = ui->nameField->text();
location = ui->locationField->text();
safety = ui->safetyField->text();
summary = ui->summaryField->text();
uses = ui->useField->text();
QSqlQuery qry;
qry.prepare("INSERT INTO TOOLS (TOOL_ID, TOOL_NAME, TOOL_SUMMARY, TOOL_LOCATION, TOOL_USE, TOOL_SAFETY) "
"VALUES (:idNumber, :name, :summary, :location, :uses, :safety)");
//binding all values to prevent sql injection attacks
qry.bindValue(":idNumber", idNumber);
qry.bindValue(":name", name);
qry.bindValue(":summary", summary);
qry.bindValue(":location", location);
qry.bindValue(":uses", uses);
qry.bindValue(":safety", safety);
if(qry.exec()){
QMessageBox::critical(this,tr("Confirmation Message"),tr("Success!"));
}
else {
QMessageBox::critical(this,tr("Confirmation Message"),tr("Error, data was not saved."), qry.lastError().text());
}
connClose();
}
我在这里连接到数据库:
//connecting to database
bool Add_item::connOpen() {
QSqlDatabase mydb = QSqlDatabase::addDatabase("QSQLITE");
mydb.setDatabaseName("C:/Users/laesc/OneDrive/Documents/ToolBuddy/test.db");
if (mydb.open()) {
ui->statusLabel->setText("Connected!");
qDebug()<<("Connected");
return true;
}
else {
ui->statusLabel->setText("Connection Not Successful...");
qDebug()<<("Not Connected");
return false;
}
}
I am trying to take data from six fields on a form and pass the data the user enters into a database (A local SQLite3 database). The ID is an integer and the primary key and the rest are varchars of enough length. After reading a lot of related questions, I still cannot figure out where my code is going wrong. I have confirmation that the program is connected to the database, but I keep getting 'parameter count mismatch'. Where am I going wrong? I'm using Qt 5.15 and C++. The table TOOL exists, as I have it open in SQLite Manager with a test row already inserted.
Below is the function that is supposed to submit the data:
//passes data to database upon clicking submit button
void Add_item::on_submitButton_clicked() {
QString name, location, safety, summary, uses, idNumber;
idNumber = ui->testIdBox->text();
name = ui->nameField->text();
location = ui->locationField->text();
safety = ui->safetyField->text();
summary = ui->summaryField->text();
uses = ui->useField->text();
QSqlQuery qry;
qry.prepare("INSERT INTO TOOLS (TOOL_ID, TOOL_NAME, TOOL_SUMMARY, TOOL_LOCATION, TOOL_USE, TOOL_SAFETY) "
"VALUES (:idNumber, :name, :summary, :location, :uses, :safety)");
//binding all values to prevent sql injection attacks
qry.bindValue(":idNumber", idNumber);
qry.bindValue(":name", name);
qry.bindValue(":summary", summary);
qry.bindValue(":location", location);
qry.bindValue(":uses", uses);
qry.bindValue(":safety", safety);
if(qry.exec()){
QMessageBox::critical(this,tr("Confirmation Message"),tr("Success!"));
}
else {
QMessageBox::critical(this,tr("Confirmation Message"),tr("Error, data was not saved."), qry.lastError().text());
}
connClose();
}
Here is where I connect to the database:
//connecting to database
bool Add_item::connOpen() {
QSqlDatabase mydb = QSqlDatabase::addDatabase("QSQLITE");
mydb.setDatabaseName("C:/Users/laesc/OneDrive/Documents/ToolBuddy/test.db");
if (mydb.open()) {
ui->statusLabel->setText("Connected!");
qDebug()<<("Connected");
return true;
}
else {
ui->statusLabel->setText("Connection Not Successful...");
qDebug()<<("Not Connected");
return false;
}
}
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对于未来的观众来说,我最终将参数数减少到2,并且查询工作了。出于某种原因,如果我试图绑定超过2个变量,则查询无效。我只是在做多个查询。
For future viewers, I ended up reducing the number of parameters to 2 and the query worked. For one reason or another the query didn't work if I tried to bind more than 2 variables. I'm just doing multiple queries.