java - 你的 SQL 语法错误在附近

标签 java mysql jdbc servlet-3.0

我需要帮助。我正在开发用于上传文本文件的应用程序。此刻我遇到了我无法清楚理解的错误。这是我的代码:

Index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Servlet based API for querying text file</title>
<link rel="stylesheet" href="css/bootstrap.min.css" type="text/css">
</head>
<body>
    <h3>Please choose file</h3>
    <div class="container">
    <form action="TextProccessing" method="post"
        enctype="multipart/form-data">

        <div class="form-group">
            <label for="browseTxt">Upload file:</label> 
            <input type="file" name="browseTxt" id="browseTxt" value="select text file">
            <p class="help-block">
                <b>Note:</b> Please choose .txt file only
            </p>
        </div>

        <BUTTON class="btn btn-default" type="submit">Upload</BUTTON>

    </form>
    </div>

    <h2>Place for text</h2>
    <div class="container"></div>
</body>
</html>

文本处理

package com.controller;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
//import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@MultipartConfig(maxFileSize = 16177215)
public class TextProccessing extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private final static String RESULT_PAGE = "/result.jsp";
    private final String dbURL = "jdbc:mysql://127.0.0.1:3306/textfilesdb";
    private final String dbUser = "root";
    private final String dbPassword = "root";
    // for this moment
    private String file_Name_test = "file_Name_test";
    private String file_size_test = "file_size_test";
    private String fileCreationDate_test = "fileCreationDate_test";

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

        InputStream inputStream = null;

        Part filePart = request.getPart("browseTxt");
        if (filePart != null) {
            // prints out some information for debugging
            System.out.println(filePart.getName());
            System.out.println(filePart.getSize());
            System.out.println(filePart.getContentType());

            // obtains input stream of the upload file
            inputStream = filePart.getInputStream();
        }

        Connection conn = null; // connection to the database
        String message = null; // message will be sent back to client

        try {
            // connects to the database
            DriverManager.registerDriver(new com.mysql.jdbc.Driver());
            conn = DriverManager.getConnection(dbURL, dbUser, dbPassword);

            // constructs SQL statement
            String sql = "INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)";
            PreparedStatement statement = conn.prepareStatement(sql);
            statement.setString(1, file_Name_test);
            statement.setString(2, file_size_test);
            statement.setString(3, fileCreationDate_test);

            if (inputStream != null) {
                // fetches input stream of the upload file for the blob column
                statement.setBlob(4, inputStream);
            }

            // sends the statement to the database server
            int row = statement.executeUpdate();
            if (row > 0) {
                message = "File uploaded and saved into database";
            }
        } catch (SQLException ex) {
            message = "ERROR: " + ex.getMessage();
            ex.printStackTrace();
        } finally {
            if (conn != null) {
                // closes the database connection
                try {
                    conn.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
            }

            // sets the message in request scope
            request.setAttribute("Message", message);
            getServletContext().getRequestDispatcher(RESULT_PAGE).forward(request, response);
        }

    }
}

看起来不错，但我有这样的错误堆栈跟踪

browseTxt 1189 text/plain 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 '?le_Name, file_size, ?leCreationDate, text_file) values ('?le_Name_test', 'file_' at line 1 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:400) at com.mysql.jdbc.Util.getInstance(Util.java:383) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:980) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3847) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3783) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2447) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2594) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1901) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2113) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2049) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2034) at com.controller.TextProccessing.doPost(TextProccessing.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1482) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source)

还有我的数据库结构

创建数据库TextFilesDB；

使用TextFilesDB；

CREATE TABLE files ( id int(11) NOT NULL AUTO_INCREMENT,
file_Name varchar(45) NOT NULL, file_size varchar(45) DEFAULT NULL, fileCreationDate varchar(45) DEFAULT NULL, text_file mediumblob, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=utf16

最佳答案

您的列名称似乎存在格式问题。您可以尝试更换

INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)

由

INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)

关于java - 你的 SQL 语法错误在附近，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33724584/

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