您的 SQL 语法附近有错误
error in your SQL syntax near
我需要帮助。我正在开发用于上传文本文件的应用程序。这一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);
}
}
}
看起来没问题，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
您的列名似乎存在格式问题。你可以尝试更换
INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)
来自
INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)
我需要帮助。我正在开发用于上传文本文件的应用程序。这一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);
}
}
}
看起来没问题，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(idint(11) NOT NULL AUTO_INCREMENT,
file_Namevarchar(45) NOT NULL,file_sizevarchar(45) DEFAULT NULL,fileCreationDatevarchar(45) DEFAULT NULL,text_filemediumblob, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=utf16
您的列名似乎存在格式问题。你可以尝试更换
INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)
来自
INSERT INTO files(file_Name, file_size, fileCreationDate, text_file) values (?, ?, ?, ?)