Question

这是我的表：

CREATE TABLE IF NOT EXISTS CauHoi( MaCH VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_unicode_ci PRIMARY KEY, MaMH VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, Question TEXT CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, Difficulty VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, a TEXT CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, b TEXT CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, c TEXT CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, d TEXT CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, Answer VARCHAR(10) NOT NULL);

这是我的疑问：

answerComboBox->addItem("a");
answerComboBox->addItem("b");
answerComboBox->addItem("c");
answerComboBox->addItem("d");
q.prepare("INSERT INTO CauHoi(MaCH,MaMH,Question,Difficulty,a,b,c,d,Answer) VALUES ('"
          + maCHLineEdit->text() + "','"
          + maMHLineEdit->text() + "','"
          + questionTextEdit->toPlainText() + "','"
          + difficultyComboBox->currentText()+ "','"
          + aLineEdit->text() + "','"
          + bLineEdit->text() + "','"
          + cLineEdit->text() + "','"
          + dLineEdit->text() + "',"
          + answerComboBox->currentText()+");");

但是当q.exec（），如果answerComboBox-＆gt; currentText（）==“c”时，CauHoi表中的Answer列变为cLineEdit-＆gt; text（）。真是太疯狂了！我只想简单地说“a”，“b”，“c”，“d”。

请帮帮我

Answer 1

我找到了。我在answerComboBox-＆gt; currentText（）附近缺少单引号。

Answer 2

您需要在

周围添加开头和结尾的单引号

answerComboBox->currentText()

MySQL INSERT INTO问题

2 个答案: