我遇到了一个非常奇怪的错误，当我运行连接到 SQL 的程序时，出现一个错误，其中显示
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "WHERE" at line 1, column 40.
其他 SQL 连接中的代码工作正常，但是这个的行为非常不同，我将下面不起作用的 SQL 连接分离出来。
请帮我解决这个问题，这已经让我头疼了两天了
public void pintransferfunds() {
//PIN FRAME
enterpinframe = new JFrame("Enter Pin");
enterpinframe.setSize(WIDTH, HEIGHT);
enterpinframe.setVisible(true);
enterpinframe.setResizable(false);
enterpinframe.setLocationRelativeTo(null);
enterpinframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//PIN PANEL
enterpinbg = new JPanel();
enterpinbg.setSize(WIDTH, HEIGHT);
enterpinbg.setBackground(Color.orange);
enterpinbg.setVisible(true);
enterpinbg.setLayout(null);
enterpinframe.add(enterpinbg);
JPasswordField inputpin = new JPasswordField();
inputpin.setFont(new Font("Consolas", Font.BOLD, 20));
inputpin.setForeground(Color.gray);
//Setbounds
inputpin.setBounds(250, 550, 100, 40);
//tester + image
enteryourpin = new ImageIcon(getClass().getResource("Enter yout PIN.png"));
tester = new JLabel(enteryourpin);
tester.setBounds(50, 50, 500, 500);
//enterpin Add
enterpinbg.add(tester);
enterpinbg.add(inputpin);
//exit and option button
OpEx();
this.dispose();
inputpin.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == (KeyEvent.VK_ENTER)) {
String pinx = inputpin.getText();
Connection con = null;
Statement stmt = null;
try {
Class.forName(JDBC_DRIVER1);
Class.forName(JDBC_DRIVER2);
con = DriverManager.getConnection(URL, USER, PASS);
stmt = con.createStatement();
String sql = "SELECT*FROM TBL_BANK WHERE PIN ='" + pinx + "' ";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
pindb = rs.getString("PIN");
account_name = rs.getString("ACCOUNT_NAME");
balance = rs.getString("BALANCE");
id =rs.getInt("ID");
}
rs.close();
} catch (Exception f) {
System.out.println(f);
}
//if Login Success and Failed
if (pinx.equals(pindb)) {
//BALANCE
//PIN FRAME
frame = new JFrame("OptionFrame");
frame.setSize(WIDTH, HEIGHT);
frame.setVisible(true);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//PIN PANEL
panel = new JPanel();
panel.setSize(WIDTH, HEIGHT);
panel.setBackground(Color.cyan);
panel.setVisible(true);
panel.setLayout(null);
username = new JLabel();
username.setBounds(0,0,300,50);
username.setText(" Welcome user:"+account_name);
panel.add(username);
pic = new ImageIcon(getClass().getResource("TranceForm(Sending money).png"));
pictester= new JLabel(pic);
pictester.setBounds(50,50, 500,500);
panel.add(pictester);
//Enter amount text
JLabel transferFunds = new JLabel("Enter Amount Php:");
transferFunds.setBounds(50,400,200,200);
transferFunds.setFont(new Font("Century Gothic",Font.BOLD,20));
//Enter receiver Id text
JLabel receiverId = new JLabel("Enter Receiver ID:");
receiverId.setBounds(50,450,200,200);
receiverId.setFont(new Font("Century Gothic",Font.BOLD,20));
//Textfield Enter Amount Php
JTextField transferField = new JTextField();
transferField.setBackground(Color.white);
transferField.setBounds(250,490,200,30);
//TextField Enter receiver Id
JTextField receiverField = new JTextField();
receiverField.setBackground(Color.white);
receiverField.setBounds(250,540,200,30);
amount =transferField.getText();
receive =receiverField.getText();
panel.add(receiverId);
panel.add(receiverField);
panel.add(transferFunds);
panel.add(transferField);
receiverField.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
//HELP ME HERE IS WHERE IT DOESNT WORK
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_ENTER)
{
Connection con = null;
Statement stmt =null;
try
{
Class.forName(JDBC_DRIVER1);
Class.forName(JDBC_DRIVER2);
con= DriverManager.getConnection(URL,USER,PASS);
stmt=con.createStatement();
String receivesql =("UPDATE TBL_BANK SET BALANCE = BALANCE+"+amount+" WHERE ID = "+receive+"");
String sendersql =("UPDATE TBL_BANK SET BALANCE= BALANCE-"+amount+" WHERE ACCOUNT_NAME='"+account_name+"'");
stmt.executeUpdate(receivesql);
stmt.executeUpdate(sendersql);
}
catch(Exception x)
{
System.out.println(x);
}
//END
if(receiverField.getText().equals(id))
{
JOptionPane.showMessageDialog(null,"You CANNOT enter your own id");
}
else
{
ImageIcon transImg = new ImageIcon(getClass().getResource("Transform (sending) is sucsseful!.png"));
JLabel transimgLoc= new JLabel(transImg);
transimgLoc.setBounds(50,50, 500,500);
panel.add(transimgLoc);
panel.remove(pictester);
panel.remove(receiverId);
panel.remove(receiverField);
panel.remove(transferFunds);
panel.remove(transferField);
panel.repaint();
}
}
}
@Override
public void keyReleased(KeyEvent e) {
}
});
frame.add(panel);
OpExtrue();
enterpinframe.dispose();
} else if (pinx != (pindb)) {
x++;
if (x <= 7) {
//LoginFailed
//if Failed to Login 3 times image icon will change to cop
enterpinbg.remove(tester);
pinwrong = new ImageIcon(getClass().getResource("PIN Wrong (1_2Times).png"));
pinwrongtester = new JLabel(pinwrong);
pinwrongtester.setBounds(50, 50, 500, 500);
inputpin.setText("");
//ADD Frame
enterpinbg.add(pinwrongtester);
System.out.println(x);
enterpinbg.repaint();
} else if (x >=8) {
enterpinbg.removeAll();
enterpinbg.add(inputpin);
inputpin.setText("");
System.out.println(x);
pinwronger = new ImageIcon(getClass().getResource("PIN Wrong2 (Many times).png"));
pinwrongertester = new JLabel(pinwronger);
pinwrongertester.setBounds(50, 50, 500, 500);
enterpinbg.add(pinwrongertester);
enterpinbg.add(panelOpEx);
enterpinbg.repaint();
}
}
}
}
@Override
public void keyReleased(KeyEvent e) {
}
});
}
最佳答案
试试这个，
String receivesql = "UPDATE TBL_BANK SET BALANCE = BALANCE + " + amount + " WHERE ID = " + receive + ";";
String sendersql = "UPDATE TBL_BANK SET BALANCE = BALANCE - " + amount + " WHERE ACCOUNT_NAME = '" + account_name + "';";
stmt.addBatch(receivesql);
stmt.addBatch(sendersql);
stmt.executeBatch();
您也可以尝试此操作，因为您同时执行两个 SQL 查询，
Connection con = null;
Statement stmt = null;
try
{
Class.forName(JDBC_DRIVER1);
Class.forName(JDBC_DRIVER2);
con = DriverManager.getConnection(URL,USER,PASS);
con.setAutoCommit(false);
stmt = con.createStatement();
String receivesql = "UPDATE TBL_BANK SET BALANCE = BALANCE + " + amount + " WHERE ID = " + receive + ";";
String sendersql = "UPDATE TBL_BANK SET BALANCE = BALANCE - " + amount + " WHERE ACCOUNT_NAME = '" + account_name + "';";
stmt.executeUpdate(receivesql);
stmt.executeUpdate(sendersql);
con.commit();
} catch(Exception x)
{
System.out.println(x);
}
关于java - 尽管我已经尝试过 SQL 中的代码，但我在 WHERE 子句中遇到错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54959533/