Question

代码：

package com.qapro.register;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;

import java.util.ArrayList;
import java.util.Date;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/RegisterMember")
public class RegisterMember extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public RegisterMember() {
        super();
        // TODO Auto-generated constructor stub
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String username = request.getParameter("username");
        String name = request.getParameter("name");
        String surname = request.getParameter("surname");
        String email = request.getParameter("email");
        String password = request.getParameter("password");

        Connection connection = null;
        PreparedStatement preparedStatement = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");

            String connectionUrl = "jdbc:mysql://localhost:3306/qapro?user=root&password=root";
            connection = DriverManager.getConnection(connectionUrl);

            String userInsertSql = "INSERT INTO qapro.user (user_name, `password`, is_active, name, surname, email, insert_date) VALUES (?, ?, ?, ?, ?, ?, ?);";
            preparedStatement = connection.prepareStatement(userInsertSql);

            preparedStatement.setString(1, username);
            preparedStatement.setString(2, password);
            preparedStatement.setBoolean(3, true);
            preparedStatement.setString(4, name);           
            preparedStatement.setString(5, surname);
            preparedStatement.setString(6, email);
            preparedStatement.setTimestamp(7, new Timestamp(new Date().getTime()));

            int affectedRowCount = preparedStatement.executeUpdate(userInsertSql);
            if(affectedRowCount > 0)
                System.out.println("User has been inserted succesfully");
            else
                System.out.println("Error occurred while inserting user");

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

        finally{
            try {
                preparedStatement.close();
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }           
    }

}

＆＃13;

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>Title</title>
	</head>

	<body>
	
		<form action="RegisterMember" method="POST">
			<fieldset>
				<legend>Log in!</legend>

					Username: <input type="text" name="username"></input>
					<br></br>
					Name: <input type="text" name="name"></input>
					<br></br>
					Surname: <input type="text" name="surname"></input>
					<br></br>
					Email: <input type="email" name="email"></input>
					<br></br>
					Password: <input type="password" name="password"></input>
					<br></br>
		
					<input type="submit" value="Submit"></input>
					
			</fieldset>
		</form>
	
	</body>

</html>

＆＃13;

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：您的SQL语法中有错误;查看与您的MySQL服务器版本相对应的手册，以便在“＆＃39;？，？，？）附近使用正确的语法”＆＃39;在第1行

My database

为什么会出现此错误？并且即使发生此错误，我的数据库也在更新。

Answer 1

您正在使用

int affectedRowCount = preparedStatement.executeUpdate(userInsertSql);

尝试执行查询，但这是不正确的。您已在userInsertSql来电中使用.prepareStatement(userInsertSql)，因此您需要做的就是

int affectedRowCount = preparedStatement.executeUpdate();

为什么PreparedStatement（JDBC）会在MySQL 5.7.9中导致MySQLSyntaxErrorException？

1 个答案: