Java数据库插入失败

我的程序应该从xml文件中获取数据并将它们放入数据库中

我使用phpmyadminmysql数据库

package jSpyDroidEclipse;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JFileChooser;

import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.spi.CurrencyNameProvider;
import java.awt.event.ActionEvent;

public class DBInput extends JFrame {

private JPanel contentPane;
private File xmlFile;

/**
 * Launch the application.
 */


public String strStr(String haystack, String needle) {
      if(haystack==null || needle==null) return null; 
      int hLength=haystack.length(); 
      int nLength=needle.length(); 
      if(hLength<nLength) return null; 
      if(nLength==0) return haystack;
      for(int i=0; i<=hLength-nLength; i++)
      {
        if(haystack.charAt(i)==needle.charAt(0))
        {
          int j=0; 
          for(; j<nLength; j++)
          {
            if(haystack.charAt(i+j)!=needle.charAt(j))
            {
              break; 
            }
          }
          if(j==nLength) return haystack.substring(i) ; 
        }  
      }
      return null; 
    }


public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                DBInput frame = new DBInput();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public DBInput() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    JButton b_browse = new JButton("Browse");
    b_browse.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            JFileChooser fileChooser = new JFileChooser();

             fileChooser.setCurrentDirectory(new java.io.File("user.home"));
                fileChooser.setDialogTitle("Select the XML file");
                fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
                if (fileChooser.showOpenDialog(b_browse) == JFileChooser.APPROVE_OPTION) {
                    xmlFile = fileChooser.getSelectedFile();


                    BufferedReader bufferedReader = null;
                    try {
                        bufferedReader = new BufferedReader(new FileReader(xmlFile));
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                    String currentLine = null;
                    try {
                        currentLine = bufferedReader.readLine();
                    } catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }


                    StringBuilder xmlCode = new StringBuilder();
                    xmlCode.append(currentLine);

                    if((currentLine!=null) && !currentLine.equals(""))
                    {
                        try {
                            while((currentLine = bufferedReader.readLine())!=null)
                            {
                                xmlCode.append(currentLine);
                            }
                        } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                        }
                    }


                    String sXMLCode = xmlCode.toString();

                    DBConnect connect = new DBConnect();
                    while(sXMLCode!=null)
                    {

                        String adv_name = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_ADV_NAME);
                        String category = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_CATEGORY);
                        String curency = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_CURENCY);
                        String free_shiping = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_FREE_SHIPPING);
                        String gift = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_GIFT_INCLUDED);
                        String manufacturer = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_MANUFACTURER);
                        String price_no_vat = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRICE_NO_VAT);
                        String price_vat = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRICE_VAT);
                        String PRODUCT_AFF_LINK = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_AFF_LINK);
                        String PRODUCT_CODE = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_CODE);
                        String PRODUCT_DESC = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_DESC);
                        String PRODUCT_NAME = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_NAME);
                        String PRODUCT_PIC = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_PIC);


                        String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) VALUES("+
                                                            PRODUCT_CODE + "," + adv_name + "," + category + "," + manufacturer + "," + gift + "," + PRODUCT_NAME + "," + PRODUCT_DESC + "," + PRODUCT_AFF_LINK + "," + PRODUCT_PIC + "," + price_no_vat + "," + price_vat + "," + free_shiping + ");";

                        connect.insertData(query);                      


                        //shifting to next product
                        String code = xmlCode.toString();
                        sXMLCode = strStr(sXMLCode.substring(1), XMLParser._TAG_PRODUCT);
                        //connect.disconnect();
                        //connect = null;
                    }
                }
        }
    });
    b_browse.setBounds(164, 103, 97, 25);
    contentPane.add(b_browse);
    }
}

我成功地从XML中获取了数据，但当我尝试将其放入数据库时失败了

DBInput.java//JFrame，带有一个按钮。当按下按钮时，程序应该将数据放入数据库中

package jSpyDroidEclipse;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JFileChooser;

import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.spi.CurrencyNameProvider;
import java.awt.event.ActionEvent;

public class DBInput extends JFrame {

private JPanel contentPane;
private File xmlFile;

/**
 * Launch the application.
 */


public String strStr(String haystack, String needle) {
      if(haystack==null || needle==null) return null; 
      int hLength=haystack.length(); 
      int nLength=needle.length(); 
      if(hLength<nLength) return null; 
      if(nLength==0) return haystack;
      for(int i=0; i<=hLength-nLength; i++)
      {
        if(haystack.charAt(i)==needle.charAt(0))
        {
          int j=0; 
          for(; j<nLength; j++)
          {
            if(haystack.charAt(i+j)!=needle.charAt(j))
            {
              break; 
            }
          }
          if(j==nLength) return haystack.substring(i) ; 
        }  
      }
      return null; 
    }


public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                DBInput frame = new DBInput();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public DBInput() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    JButton b_browse = new JButton("Browse");
    b_browse.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            JFileChooser fileChooser = new JFileChooser();

             fileChooser.setCurrentDirectory(new java.io.File("user.home"));
                fileChooser.setDialogTitle("Select the XML file");
                fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
                if (fileChooser.showOpenDialog(b_browse) == JFileChooser.APPROVE_OPTION) {
                    xmlFile = fileChooser.getSelectedFile();


                    BufferedReader bufferedReader = null;
                    try {
                        bufferedReader = new BufferedReader(new FileReader(xmlFile));
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                    String currentLine = null;
                    try {
                        currentLine = bufferedReader.readLine();
                    } catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }


                    StringBuilder xmlCode = new StringBuilder();
                    xmlCode.append(currentLine);

                    if((currentLine!=null) && !currentLine.equals(""))
                    {
                        try {
                            while((currentLine = bufferedReader.readLine())!=null)
                            {
                                xmlCode.append(currentLine);
                            }
                        } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                        }
                    }


                    String sXMLCode = xmlCode.toString();

                    DBConnect connect = new DBConnect();
                    while(sXMLCode!=null)
                    {

                        String adv_name = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_ADV_NAME);
                        String category = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_CATEGORY);
                        String curency = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_CURENCY);
                        String free_shiping = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_FREE_SHIPPING);
                        String gift = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_GIFT_INCLUDED);
                        String manufacturer = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_MANUFACTURER);
                        String price_no_vat = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRICE_NO_VAT);
                        String price_vat = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRICE_VAT);
                        String PRODUCT_AFF_LINK = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_AFF_LINK);
                        String PRODUCT_CODE = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_CODE);
                        String PRODUCT_DESC = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_DESC);
                        String PRODUCT_NAME = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_NAME);
                        String PRODUCT_PIC = XMLParser.getItem(new String(sXMLCode), XMLParser._TAG_PRODUCT_PIC);


                        String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) VALUES("+
                                                            PRODUCT_CODE + "," + adv_name + "," + category + "," + manufacturer + "," + gift + "," + PRODUCT_NAME + "," + PRODUCT_DESC + "," + PRODUCT_AFF_LINK + "," + PRODUCT_PIC + "," + price_no_vat + "," + price_vat + "," + free_shiping + ");";

                        connect.insertData(query);                      


                        //shifting to next product
                        String code = xmlCode.toString();
                        sXMLCode = strStr(sXMLCode.substring(1), XMLParser._TAG_PRODUCT);
                        //connect.disconnect();
                        //connect = null;
                    }
                }
        }
    });
    b_browse.setBounds(164, 103, 97, 25);
    contentPane.add(b_browse);
    }
}

我还测试了没有while循环的插入方法，它可以工作

错误消息：

java.sql.SQLException:没有为参数1指定值
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:964‌​)
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:897‌​)
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:886‌​)

---

你似乎没有使用撇号。至少应该是这样的：-

   String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) 
   VALUES('"+ PRODUCT_CODE + "','" + adv_name + "', [etc]

---

…虽然这会让您面临SQL注入攻击，所以我会使用参数。

您似乎没有使用撇号。至少应该是这样的：-

   String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) 
   VALUES('"+ PRODUCT_CODE + "','" + adv_name + "', [etc]

…虽然这会让您面临SQL注入攻击，所以我会使用参数

第一：您使用的是错误的

PrepapredStatement

第二：我假设像

PRODUCT\u code

，

adv\u name

这样的类型值是字符串，字符串应该在两个引号之间

“value”

要解决您的问题，您可以：

您可以创建两个方法，一个返回准备好的语句，另一个关闭语句，而不是

public void insertData（String query）

为每个对象创建一个方法，该方法接收您的对象，调用prepapred语句，执行该语句，最后关闭该语句

下面是一个简单的例子：

String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, "
        + "gift_included, product_name, product_desc, product_aff_link, "
        + "product_pic, price_no_vat, price_vat, free_shipping) VALUES(?, ?, ?, ....)";
try (PreparedStatement pstm = getPreparedStatement(query)) {
    pstm.setString(1, PRODUCT_CODE);
    pstm.setString(2, adv_name);
    pstm.setString(3, category);
    ...
    pstm.execute();
    closeStatement(pstm);
}

第一：您使用的是错误的

PrepapredStatement

第二：我假设像

PRODUCT\u code

，

adv\u name

这样的类型值是字符串，字符串应该在两个引号之间

“value”

要解决您的问题，您可以：

您可以创建两个方法，一个返回准备好的语句，另一个关闭语句，而不是

public void insertData（String query）

为每个对象创建一个方法，该方法接收您的对象，调用prepapred语句，执行该语句，最后关闭该语句

下面是一个简单的例子：

String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, "
        + "gift_included, product_name, product_desc, product_aff_link, "
        + "product_pic, price_no_vat, price_vat, free_shipping) VALUES(?, ?, ?, ....)";
try (PreparedStatement pstm = getPreparedStatement(query)) {
    pstm.setString(1, PRODUCT_CODE);
    pstm.setString(2, adv_name);
    pstm.setString(3, category);
    ...
    pstm.execute();
    closeStatement(pstm);
}

---

在下面的行中可以肯定：

String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) VALUES("+
                                                            PRODUCT_CODE + "," + adv_name + "," + category + "," + manufacturer + "," + gift + "," + PRODUCT_NAME + "," + PRODUCT_DESC + "," + PRODUCT_AFF_LINK + "," + PRODUCT_PIC + "," + price_no_vat + "," + price_vat + "," + free_shiping + ");";

您需要更改代码，如下所示：

'"+PRODUCT_CODE+"', 

以及其他变量

---

您可以感觉到这（字符串连接）是一种非常简单的查询方式。您需要使用。这也将避免。

请在下面的一行中确认：

String query = "INSERT INTO PRODUCTS(product_code, adv_name, category, manufacturer, gift_included, product_name, product_desc, product_aff_link, product_pic, price_no_vat, price_vat, free_shipping) VALUES("+
                                                            PRODUCT_CODE + "," + adv_name + "," + category + "," + manufacturer + "," + gift + "," + PRODUCT_NAME + "," + PRODUCT_DESC + "," + PRODUCT_AFF_LINK + "," + PRODUCT_PIC + "," + price_no_vat + "," + price_vat + "," + free_shiping + ");";

您需要更改代码，如下所示：

'"+PRODUCT_CODE+"', 

以及其他变量

---

您可以感觉到这一点（字符串连接）是一种不可编辑的查询方式。您需要使用。这也将避免。

您是否尝试调试应用程序？检查您的查询，看看参数的数量是否匹配。检查是否没有任何参数获得

null

值。如果您能够在不使用while循环的情况下插入值，则检查是否所有参数都是p在整个while循环中重新发送。请发布您的完整错误stack@Jeyaprakash它很长，有一个帖子limit@GaurangDespande参数肯定不是空的。我从一个文件中读取了它，并仔细检查了里面的内容。我还检查了参数的数量。“没有为参数1指定值”…我真的不知道这意味着什么。好的，你能添加stacktrace显示的行号吗，因为你的代码太长了。你试过调试你的应用程序吗？检查你的查询，看看参数的数量是否匹配。检查是否没有参数得到

null

值。如果你能插入值如果没有while循环，则检查整个while循环中是否存在所有参数。请发布您的完整错误stack@Jeyaprakash它很长，有一个帖子limit@GaurangDespande参数肯定不是空的。我从一个文件中读取了它，并仔细检查了里面的内容。我还检查了参数的数量。“没有为参数1指定值”…我真的不知道这意味着什么。好的，你能添加stacktrace显示的行号吗，因为你的代码太长了