Question

我试图将数据插入到我的SQL表中。我有一个Jframe：

表单的目的是将写在这些文本字段上的内容输入到数据库中。我的问题是，当我按发送请求时，没有任何反应..我错过了什么吗？

这是发送请求按钮的代码：

private void SendRequestActionPerformed(java.awt.event.ActionEvent evt) {                                            
    try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = (Connection)
            DriverManager.getConnection("jdbc:mysql://localhost:3306/database","my-user","my-pass");
            Statement stmt = con.createStatement();

            //execute commands that collects
            //the text/items from  the fields and converts them to strings
            String MedRole = ofMedRoleComboBox.getSelectedItem().toString();
            String PtID = ofPatientIDField.getText();
            String Date = ofDateField.getText();
            String Time = ofTimeField.getText();
            String Purpose = ofPurposeComboBox.getSelectedItem().toString();


            // sql query
            String insertOrdersDB = "INSERT INTO Orders ('PatientID','MedicalRole','Date','Time','Purpose') VALUES ("+MedRole+","+PtID+","+Date+","+Time+","+Purpose+")";

            // executing sql query
            stmt.executeUpdate(insertOrdersDB);

        }
        catch (Throwable e) {
        e.printStackTrace();
        }
}

在 e.printStackTrace（）; 中：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 
You have an error in your SQL syntax; check the manual 
that corresponds to your MySQL server version for the 
right syntax to use near ''PatientID','MedicalRole','Date','Time','Purpose') VALUES (Nurse,7,2016-04-13,12' at line 1

我认为这是日期语法，它与SQL不同。所以我改变它以匹配SQL表格式。但仍然有同样的错误。

现在我认为关于时间？

Answer 1

好的，所以我跟进了你的一些评论和反馈。对此感激不尽。我还在学习Java，我知道我还有很长的路要走。

但无论如何，多亏了你的指导，我设法让我的表格起作用。

PreparedStatement pstmt = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
            Connection con = (Connection)
        DriverManager.getConnection("jdbc:mysql://localhost:3306/database","my-user","my-pass");    

        String sql = "INSERT INTO Orders (PatientID, MedicalRole, Date, Time, Purpose) VALUES (?,?,?,?,?)";    

        pstmt = con.prepareStatement(sql);
        pstmt.setInt(1, Integer.parseInt(ofPatientIDField.getText()));
        pstmt.setString(2, ofMedRoleComboBox.getSelectedItem().toString());
        pstmt.setObject(3, ofDateField.getValue());
        pstmt.setObject(4, ofTimeField.getText());
        pstmt.setString(5, ofPurposeComboBox.getSelectedItem().toString());

        pstmt.executeUpdate();

    } catch (Exception e) {
        e.printStackTrace();
    }

所以是的，我用之前的尝试替换了它，并且它有效！

感谢您告诉我使用 Prepared Statements :) @MadProgrammer

将数据插入SQL DB时，操作按钮不起作用 - Java

1 个答案: