通过 Netbeans 向数据库添加值

Question

我收到一个 SQLexception 错误，列计数与第 1 行的值计数不匹配。 我已尝试更改数据库以相应地检查语句，但未能识别问题。有什么建议请...

JButton btnNewButton_1 = new JButton("Save");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {


String PHN = textField_a.getText();
String Week1 = textField_4.getText();
String Week2 = textField_5.getText();
String Week3 = textField_6.getText();
String Week4 = textField_7.getText();

if (PHN.equals("") || (Week1.equals("") || (Week2.equals("") || (Week3.equals("") || (Week4.equals("") ))))) {
JOptionPane.showMessageDialog(frmTemplate, "Please enter values in all the fields.");   
}

else {

try {
db.stmt.executeUpdate("INSERT INTO weight (PHN, Week1, Week2, Week3, Week4)"+"VALUES"+"("+"'"+PHN+"',"+"'"+Week1+"',"+"'"+Week2+"'"+"'"+Week3+"'"+"'"+Week4+"')");
JOptionPane.showMessageDialog(frmTemplate, "New Record Added");

textField_a.setText(null);
textField_4.setText(null);
textField_5.setText(null);
textField_6.setText(null);
textField_7.setText(null);

}
catch (SQLException e) {
JOptionPane.showMessageDialog(frmTemplate, "The value you have entered already exist");
e.printStackTrace();



}

}
}
});

Answer 1

您好像少了几个逗号。尝试查看 PreparedStatement 类来创建你的陈述。使用它比尝试构建查询字符串要容易得多，它可以保护您免受sql injection 的侵害。祝你好运！