狂神SSM整合笔记

SSM-CRUDSam:SpringMVC+Spring+MybatisCRUD:Create（创建）Retrieve（查询）Update（更新）Delete（删除）环境要求：+ Idea+ MySSQL+ Tomcat+ Maven要求：需要熟练掌握MySQL数据库，Spring，JavaWEB及MyBatis知识，简单的前端知识；Mybatis层1.数据库环境DROP TABLE IF EXI

HGW689

752人浏览 · 2021-10-31 21:09:15

HGW689 · 2021-10-31 21:09:15 发布

SSM-CRUD

Sam:SpringMVC+Spring+Mybatis

CRUD:

Create（创建）

Retrieve（查询）

Update（更新）

Delete（删除）

环境要求：

   + Idea
   + MySSQL
   + Tomcat
   + Maven

要求：

需要熟练掌握MySQL数据库，Spring，JavaWEB及MyBatis知识，简单的前端知识；

Mybatis层

1.数据库环境

 DROP TABLE IF EXISTS `books`;

CREATE TABLE books ( bookID int NOT NULL COMMENT '书id', bookName varchar(100) NOT NULL COMMENT '书名', bookCounts int NOT NULL COMMENT '数量', detail varchar(200) NOT NULL COMMENT '描述', PRIMARY KEY (bookID) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;

-- Records of books

BEGIN; INSERT INTO books VALUES (1001, 'Java', 1, '从入门到放弃'); INSERT INTO books VALUES (1002, 'MySQL', 10, '从删库到炮路'); INSERT INTO books VALUES (1003, 'Linux', 5, '从进门到进牢');

2.基本环境搭建

新建—Maven项目！ssmbuild,添加web的支持

导入相关的pom依赖

 <!--依赖：junit,数据库驱动，连接池，servlet,jsp,mybatis,mybatis-spring,spring-->
 <dependencies>
     <!--Junit-->
     <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>4.12</version>
     </dependency>
     <!--数据库驱动-->
     <!-- mysql驱动 -->
     <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>8.0.26</version>
     </dependency>
     <!-- 数据库连接池 c3p0-->
     <dependency>
         <groupId>com.mchange</groupId>
         <artifactId>c3p0</artifactId>
         <version>0.9.5.2</version>
     </dependency>
 
     <!--Servlet - JSP -->
     <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.5</version>
     </dependency>
     <dependency>
         <groupId>javax.servlet.jsp</groupId>
         <artifactId>jsp-api</artifactId>
         <version>2.2</version>
     </dependency>
     <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>jstl</artifactId>
         <version>1.2</version>
     </dependency>
 
     <!--mybatis-->
     <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis</artifactId>
         <version>3.5.2</version>
     </dependency>
     <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis-spring</artifactId>
         <version>2.0.2</version>
     </dependency>
 
     <!--Spring-->
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>5.1.9.RELEASE</version>
     </dependency>
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-jdbc</artifactId>
         <version>5.1.9.RELEASE</version>
     </dependency>
 </dependencies>

Maven资源过滤设置

 <!--静态资源导出-->
 <build>
     <!--资源插件：处理src/main/java目录中的xml-->
     <resources>
         <resource>
             <directory>src/main/java</directory><!--所在的目录-->
             <includes><!--包括目录下的.properties,.xml 文件都会扫描到-->
                 <include>**/*.properties</include>
                 <include>**/*.xml</include>
             </includes>
             <filtering>false</filtering>
         </resource>
         <resource>
             <directory>src/main/resources</directory><!--所在的目录-->
             <includes><!--包括目录下的.properties,.xml 文件都会扫描到-->
                 <include>**/*.properties</include>
                 <include>**/*.xml</include>
             </includes>
             <filtering>false</filtering>
         </resource>
     </resources>
 </build>

建立基本结构和配置框架！

com.kuang.pojo
com.kuang.dao
com.kuang.service
com.kuang.controller

mybatis-config.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE configuration
         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>
 
 </configuration>

applicationContext.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
 
 </beans>

3.Mybatis层编写

1、数据课配置文件

database.properties

 jdbc.dirver=com.mysql.jdbc.Driver
 # 如果使用的是MySQL8.0以上的，增加一个时区的配置；&serverTimezone=Asia/Shanghai
 jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useUnicode=true&characterEncoding=utf-8
 jdbc.username=root
 jdbc.password=hgw6721224

2、IDEA关联数据库

3、编写MyBatis的核心配置文件

mybatis-config.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE configuration
         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>
 
     <!--配置数据源，交给Spring去做-->
 
     <!--别名-->
     <typeAliases>
         <package name="com.kuang.pojo"/>
     </typeAliases>
 
     <mappers>
         <mapper class="com.kuang.dao.BookMapper" />
     </mappers>
 </configuration>

4、编写数据库对应的实体类 com.kuang.pojo.Books

使用lombok插件

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private String bookCounts;
    private String detail;
}

5、编写Dao层的Mapper接口

package com.kuang.dao;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;

/**
 * Data time:2021/10/15 10:13
 * StudentID:2019112118
 * Author:hgw
 * Description:
 */
public interface BookMapper {

    //增加一本书
    int addBoos(Books book);

    //删除一本书
    int deleteBookByID(@Param("bookId") int id);

    //更新一本书
    int updateBook(Books book);

    //查询一本书
    Books quertBookById(@Param("booId") int id);

    //查询全部书
    List<Books> queryAllBook();

    //查询一本书(书名)
    Books queryBookByName(@Param("bookName") String bookName);
}

6、编写接口对应的Mapper.xml文件。需要导入MyBatis的包：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.dao.BookMapper">
    
    <insert id="addBoos" parameterType="Books" >
        INSERT INTO books (bookName, bookCounts, detail)
        VALUES (#{bookName},#{bookCounts},#{detail});
    </insert>

    <delete id="deleteBookByID" parameterType="int" >
        delete from books where bookID = #{bookId}
    </delete>

    <update id="updateBook" parameterType="Books" >
        update books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID}
    </update>

    <select id="quertBookById" resultType="Books" >
        select * from books
        where bookID = #{booId}
    </select>

    <select id="queryAllBook" resultType="Books" >
        select *
        from books;
    </select>

    <select id="queryBookByName" resultType="Books">
        select *
        from books
        where bookName = #{bookName}
    </select>
</mapper>

7、编写Service层的接口和实现类

接口：

package com.kuang.service;

import com.kuang.pojo.Books;

import java.util.List;

/**
 * Data time:2021/10/15 10:47
 * StudentID:2019112118
 * Author:hgw
 * Description:
 */
public interface BookService {
    //增加一本书
    int addBoos(Books books);

    //删除一本书
    int deleteBookByID(int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books quertBookById(int id);

    //查询全部书
    List<Books> queryAllBook();
}

实现类：

package com.kuang.service;

import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;

import java.util.List;

/**
 * Data time:2021/10/15 10:49
 * StudentID:2019112118
 * Author:hgw
 * Description:
 */
public class BookServiceImpl implements BookService {

    //service 调用 dao层： 组合Dao
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    public int addBoos(Books books) {
        return bookMapper.addBoos(books);
    }

    public int deleteBookByID(int id) {
        return bookMapper.deleteBookByID(id);
    }

    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    public Books quertBookById(int id) {
        return bookMapper.quertBookById(id);
    }

    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

OK，到此，底层需求操作编写完毕！

Spring层

1.Spring整合MyBatis

配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

我们去编写Spring整合MyBatis的相关配置文件；spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties" />

    <!--2.链接池
        dbcp:   半自动化操作，不能自动连接
        c3p0:   自动化操作（自动化的加载配置文件，并且可以自动设置到对象中！）
        druid；  hikari:
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.dirver}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
        <property name="dataSource" ref="dataSource" />
        <!--绑定Mybatis的配置i文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml" />
    </bean>

    <!--配置dao接口扫描包，动态的实现了Dao接口可以注入到Spring容器中！-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" >
        <!--注入 SqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        <!--要扫描的dao包-->
        <property name="basePackage" value="com.kuang.dao" />
    </bean>

</beans>

2.Spring整合service层

Spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:conetxt="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.扫描service 下的包-->
    <conetxt:component-scan base-package="com.kuang.service" />

    <!--2.将我们的所有业务类，注入到Spring，可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl" >
        <property name="bookMapper" ref="bookMapper" />
    </bean>

    <!--3.声明式事务配置-->
    <bean id="TransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

Spring层搞定！再次理解一下，Spring就是一个大杂烩，一个容器！

SpringMVC层

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--DispatchServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

2、spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-cache.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.注解驱动-->
    <mvc:annotation-driven/>
    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler />
    <!--3.扫描包：controller-->
    <context:component-scan base-package="com.kuang.controller" />
    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

3、Srping配置整合文件，applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml" />
    <import resource="classpath:spring-service.xml" />
    <import resource="classpath:spring-mvc.xml" />
</beans>

配置文件，暂时结束！

Controller 和视图层编写

1.BookController类编写，增删改查

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.awt.print.Book;
import java.util.ArrayList;
import java.util.List;

/**
 * Data time:2021/10/15 15:37
 * StudentID:2019112118
 * Author:hgw
 * Description:
 */
@Controller
@RequestMapping("/book")
public class BookController {
    //controller 调用 service层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍，并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPage() {
        return "addBook";
    }

    //添加书籍的请求
    @RequestMapping("/addBook")
    public String addBook(Books books) {
        System.out.println("addBook=>" + books );
        bookService.addBoos(books);
        return "redirect:/book/allBook";    //重定向到我们的@RequestMapping("/allbook")请求；
    }

    //跳转到修改页面
    @RequestMapping("/toUpdate")
    public String toUpdatePaper(int id,Model model) {
        Books books = bookService.quertBookById(id);
        model.addAttribute("QBook", books);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books) {
        System.out.println("updateBook=>" + books );
        int i = bookService.updateBook(books);
        if (i>0) {
            System.out.println("添加成功" + books);
        }
        List<Books> list = bookService.queryAllBook();
        list.forEach(li-> System.out.println(li));
        return "redirect:/book/allBook";    //重定向到我们的@RequestMapping("/allbook")请求；
    }

    //删除书籍
    @RequestMapping("/deleteBook/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id){
        bookService.deleteBookByID(id);
        return "redirect:/book/allBook";    //重定向到我们的@RequestMapping("/allbook")请求；
    }

    //查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model) {
        Books books = bookService.queryBookByName(queryBookName);
        List<Books> list = new ArrayList<Books>();
        list.add(books);

        if (books==null) {
            list = bookService.queryAllBook();
            model.addAttribute("error", "未查到");
        }
        model.addAttribute("list", list);
        return "allBook";
    }
}

2.前端页面编写

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>首页</title>

    <style>
        a{
            text-decoration: none;
            color: black;
            font-size: 18px;
        }
        h3{
            width: 180px;
            height: 38px;
            margin: 100px auto;
            text-align: center;
            line-height: 38px;
            background: deepskyblue;
            border-radius: 5px;
        }
    </style>
</head>
<body>
<h3>
    <a href="${pageContext.request.contextPath}/book/allBook" >进入书籍页面</a>
</h3>
</body>
</html>

allBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示页面</title>

    <%--BootStrap美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">
        <div class="row clearfix">
            <div class="col-md-12 column" >
                <div class="page-header">
                    <h1>
                        <small>书籍列表 —— 显示所有书籍</small>
                    </h1>
                </div>
            </div>

            <div class="row" >
                <div class="col-md-4 column">
                    <%--toAddBook--%>
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
                </div>
                <div class="col-md-4 column"></div>
                <div class="col-md-4 column">
                    <%--查询书籍--%>
                    <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
                        <span style="color: red;font-weight: bold">${error}</span>
                        <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称">
                        <input type="submit" value="查询" class="btn btn-primary">
                    </form>
                </div>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column" >
            <table class="table table-hover table-striped" >
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                    </tr>
                </thead>

                <%--书籍从数据库查询出来，从这个list中遍历出来：foreach--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</body>
</html>

addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>增加书籍</title>
    <%--BootStrap美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">

        <div class="row clearfix">
            <div class="col-md-12 column" >
                <div class="page-header">
                    <h1>
                        <small>新增书籍</small>
                    </h1>
                </div>
            </div>

        </div>

        <form action="${pageContext.request.contextPath}/book/addBook" method="post">
            <div class="form-group">
                <label>书籍名称：</label>
                <input type="text" name="bookName" class="form-control" required>
            </div>
            <div class="form-group">
                <label >书籍数量：</label>
                <input type="text" name="bookCounts" class="form-control" required>
            </div>
            <div class="form-group">
                <label>书籍描述：</label>
                <input type="text" name="detail" class="form-control" required>
            </div>
            <div class="form-group">
                <input type="submit" class="form-control" value="添加" required>
            </div>
        </form>
    </div>
</body>
</html>

updateBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <%--BootStrap美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">

    <div class="row clearfix">
        <div class="col-md-12 column" >
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>

    </div>

    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">

        <%--出现的问题：我们提交了修改的SQL请求，但是修改失败，初次考虑，是事务问题，配置完毕事务，依旧失败！--%>
        <%--看一下SQl语句，能否执行成功：SQL失败，修改未完成--%>
        <%--前端传递隐藏域--%>

        <input type="hidden" name="bookID" value="${QBook.bookID}">
        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
        </div>
        <div class="form-group">
            <label >书籍数量：</label>
            <input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label>书籍描述：</label>
            <input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改" required>
        </div>
    </form>
</div>
</body>
</html>

CSDN学习社区

CSDN联合极客时间，共同打造面向开发者的精品内容学习社区，助力成长！

更多推荐

嵌入式作业（七）：基于Ardunio的STM32串口通信

嵌入式作业（七）0作业要求1Ardunio 完成STM32的串口通信（1）安装Ardunio IDE（2）stm32串口通信2关于 stduino IDE0作业要求安装 Ardunio IDE 和相关软件支持库，在Ardunio 完成STM32板子的串口通信程序：（1）持续向串口输出“Hello world！”；（2）当接收到“stop!”时，停止输出。网上有一个国人版的MCU集成开发平台， st

CSDN学习社区

JDBC详解

JDBC文章目录JDBC什么是JDBC?JDBC驱动程序:Java使用JDBC访问数据库的步骤:设置classpath:Oracle连接字符串的书写格式:简单的例子:常用数据库的驱动程序及JDBC URL:Oracle数据库:SQL Server数据库MySQL数据库Access数据库PreparedStatement接口:JNDI-数据源（Data Source）与连接池（Connection

CSDN学习社区

“模式识别与机器学习”学习笔记no2.再谈感知机

接**上篇：上篇主要进行了PLA，Pocket算法的理论过程分析和在给定数据集上利用pocket算法对数据集进行分类学习，得到错分数量最少的分类面。上篇中pocket算法的过程已经进行了编程和测试，框架已经建立了起来，这一篇主要上篇中没有提到或涉及不深的几个问题。1.数据集的构造。上篇是直接使用了题目给的向量，这次来根据正态分布来产生数据集。np.random.normal函数可以根据均值和方差生