SSM整合

目录

SSM框架整合
 搭建数据库(MySQL)
基本项目的搭建
 Mybatis层
 Spring层
 SpringMVC层
 小结(MySQL数据库主键无法连续自增问题)

SSM框架整合

环境

IDEA
MySQL 5.5
Tomcat 8.5.34
Maven 3.6.0

搭建数据库(MySQL)

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从入门到进牢');

基本项目的搭建

新建maven项目,添加web支持

导入相关的maven依赖

<dependencies>
   <!--Junit-->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
   </dependency>
   <!--数据库驱动-->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.47</version>
   </dependency>
   <!-- 数据库连接池 -->
   <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>

3.Maven资源过滤问题

<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>false</filtering>
       </resource>
       <resource>
           <directory>src/main/resources</directory>
           <includes>
               <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.inspur.pojo (持久层)
com.inspur.dao (Dao层)
com.inspur.service (业务处理层)
com.inspur.controller (业务控制层)

mybatis-config.xml (可在IDEA中设置xml模版) --> File | Settings | 编辑器 | 文件和代码模板

<?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>
    
    <!-- 别名设置 pojo:实体类上可加注解 @Alias("books")-->
    <!--可在Mapper.xml文件中使用时无需类的全限定名,默认为类名 -->
    <typeAliases>
        <package name=""/>
    </typeAliases>
    <!-- mapper文件路径 -->
    <mappers>
        <mapper resource=""></mapper>
    </mappers>
</configuration>

applicationContext.xml (IDEA含有spring的初始化的配置文件)

<?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>

Mybatis层

数据库配置文件db.properties (设为模版,同上), --> 在Spring配置文件中读取

jdbc.driver=com.mysql.jdbc.Driver
#如果使用MySQL8.0+,需要增加一个时区的配置; &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

IDEA关联数据库(idea自带的数据库链接)

编写(完善配置信息注意标签的顺序)MyBatis的核心配置文件(mybatis-config.xml)

    <!-- 标准的 日志工厂实现  -->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--  是否开启自动驼峰命名规则 (camel case)映射 -->
        <!--  <setting name="mapUnderscoreToCamelCase" value="true"/>-->
		<!-- 开启全局缓存  -->
        <setting name="cacheEnabled" value="true"/>
    </settings>


<typeAliases>
	<package name="com.inspur.pojo"/>
</typeAliases>
<mappers>
	<mapper resource="com.inspur.dao.BookNapper.xml"/>
</mappers>

编写数据库对应的实体类com.inspur.pojo.Books

使用Lombok插件

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.ibatis.type.Alias;
import java.io.Serializable;
/**
 * @author 12093
 * @Created by 12093
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Alias("books")   //可在Mapper.xml文件中使用,无需类的全限定名
public class Books implements Serializable {
     //我们需要将实体类序列化(implements Serializable)！否则就会报错！
     private int bookID;
     private String bookName;
     private int bookCounts;
     private String detail;
}

编写Dao层的Mapper接口

import com.inspur.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
/**
 * @author 12093
 */
public interface BookMapper {
    //实现 增/删/改/查
    // 增加一本书
    int addBook(Books books);
    //  删除一本书
    int deleteBookById(@Param("bookID") int id);
    // 更新一本书
    int updateBookById(Books books);
	// 查询一本书
    Books queryBookById(@Param("bookID") int id);
    // 查询全部的书
    List<Books> queryAllBook();
    //根据ID查询一本书
    List queryBookByName(@Param("bookName") String bookName);
    
}

编写接口对应的Mapper.xml文件(最好与其接口同名/同路径)

<?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">
<!--   MyBatis映射文件  -->
<!--namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.inspur.dao.BookMapper">
    <cache/>   <!-- 设置此xml文件,使用二级缓存  -->
    
    <!--增加一个Book-->
    <insert id="addBook" parameterType="Books">
        insert into books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>

     <!--根据id删除一个Book-->
    <delete id="deleteBookById" parameterType="int">
        delete from books where bookID = #{bookID}
    </delete>

    <!--更新Book-->
    <update id="updateBookById" parameterType="Books">
        update books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID};
    </update>

    <!--根据id查询,返回一个Book-->
    <select id="queryBookById" resultType="Books">
        select * from books 
        where bookID = #{bookID}
    </select>
    
    <!--查询全部Book-->
    <select id="queryAllBook" resultType="Books">
        select * from books;
    </select>
    
    <!--根据bookName查询,返回一个Book-->
    <select id="queryBookByName" resultType="Books">
        select * from books where bookName like "%"#{bookName}"%"
    </select>
    
</mapper>

编写Service层的接口和实现类

接口:

package com.inspur.service;

import com.inspur.pojo.Books;
import java.util.List;
/**
 * @author 12093
 * @Classname BookService
 * @Date 2020/11/8 22:58
 *   BookService:底下需要去实现,调用dao层
 */
public interface BookService {
    // 增加一本Book
    int addBook(Books books);
    
    //根据id删除一本书Book
    int deleteBookById(int id);

    // 更新Book
    int updateBookById(Books books);

    //根据ID查询,返回一个Book
    Books queryBookById(int id);

    //查询全部Book,返回list集合
    List<Books> queryAllBook();
    
    //根据书名模糊查询一本书
 List<Books> queryBookByName(@Param("bookName") String bookName);
}

   
   实现类:
   
   ```java
   mport com.inspur.dao.BookMapper;
   import com.inspur.pojo.Books;
   import java.util.List;
   public class BookServiceImpl implements BookService{
      
       //service调dao层:  组合Dao    可添加业务
       private BookMapper bookMapper;
   
       public void setBookMapper(BookMapper bookMapper) {
           this.bookMapper = bookMapper;
       }
   
       @Override
       public int addBook(Books books) {
           return bookMapper.addBook(books);
       }
   
       @Override
       public int deleteBookById(int id) {
           return bookMapper.deleteBookById(id);
       }
   
       @Override
       public int updateBookById(Books books) {
           return bookMapper.updateBookById(books);
       }
   
       @Override
       public Books queryBookById(int id) {
           return bookMapper.queryBookById(id);
       }
   
       @Override
       public List<Books> queryAllBook() {
           return bookMapper.queryAllBook();
    }
       
     @Override
       public List<Books> queryBookByName(String bookName) {
           return bookMapper.queryBookByName(bookName);
       }
   }

底层需求操作完毕

Spring层

🕶️注意事项: 所有的Spring的配置文件,配置的应用程序上下文在一个文件中

配置 Spring整合MyBatis ,这里使用c3p0连接池;

我们去编写Spring整合MyBatis的相关配置文件; Spring-dao.xml (多个Spring配置文件,整合,分层管理)

<?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">
    
<!--    DataSource:使用Spring的数据源替换MyBatis的配置 c3p0/dbcp/druid-->
<!--    1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>

<!--    2.连接池
        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">
         <property name="driverClass" value="${jdbc.driver}"/>
         <property name="jdbcUrl" value="${jdbc.url}"/>
         <property name="user" value="${jdbc.username}"/>
         <property name="password" value="${jdbc.password}"/>
         
         <!-- c3p0连接池的私有属性    可默认不使用-->
         <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.配置sqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <!--  注入数据库连接池  -->
        <property name="dataSource" ref="dataSource"/>
<!--       配置MyBatis的全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

<!-- 4. 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"/>
<!--        给出需要扫描的Dao接口包  -->
        <property name="basePackage" value="com.inspur.dao"/>
    </bean>
</beans>

Spring整合Service层

<?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. 扫描service下的包 -->
    <context:component-scan base-package="com.inspur.service"/>

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

<!--   3. 配置事务管理器 -->
    <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! Spring就是一个大杂烩,一个容器!

SpringMVC层

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>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
        <!-- 一定要注意: 这里加载的是总的配置文件!!!  不是Spring-mvc.xml   -->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--   启动优先级     -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
        <!--  "/",处理所有文件; "/*"不处理.jsp文件    -->
    </servlet-mapping>
    
<!--    乱码过滤  encodingFilter  -->
    <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过期时间  -->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

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:nvc="http://www.springframework.org/schema/mvc" 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-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

<!--  配置SpringMVC  -->
    <!--    1.开启SpringMVC注解驱动 -->
    <nvc:annotation-driven/>
    
    <!--    2.静态资源过滤默认servlet配置 -->
    <mvc:default-servlet-handler/>
    
    <!--    3.扫描web相关的bean:controller -->
    <context:component-scan base-package="com.inspur.controller"/>
    
    <!--    4.配置jsp显示ViewResolver试图解析器  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

Spring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">
	<!--    整合配置文件   -->
    <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

BookController类编写, 一、查询所有书籍

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    /// 查询全部书籍,并发挥到一个书籍的展示页面
    @RequestMapping("/allBook")  //查询所有Book
    public String list(Model model){
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }

编写首页index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head>
   <title>首页</title>
   <style type="text/css">
       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: 4px;
      }
   </style>
</head>
<body>

<h3>
   <a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
</h3>
</body>
</html>

书籍列表展示页面 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>书籍列表</title>
    
<%--    引入Bootstrap 美化界面 --%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<%--    Bootstrap框架提供了更好的跨浏览器一致性 --%>
    <link href="../../css/normalize.css" rel="stylesheet">
</head>
<body>
<%--边框线--%>
<div class="container">
    <%-- 清除浮动--%>
    <div class="row clearfix">
    <%--    把一个列中等(md)屏幕(12份)分成12份     --%>
        <div class="col-md-12 column">
            <%-- 头部 标签--%>
            <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">
            <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" placeholder="请输入要查询的书籍名称" required>
                <input type="submit" value="查询" class="btn btn-primary">
            </form>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
<%--     table-hover:隔行变色     --%>
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>

                <tbody>
                <c:forEach var="book" items="${list}">
                    <tr>
                        <td>${book.getBookID()}</td>
                        <td>${book.getBookName()}</td>
                        <td>${book.getBookCounts()}</td>
                        <td>${book.getDetail()}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> |&nbsp;
                            <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
             </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

添加书籍

//跳转到添加书籍页面(addBook.jsp)
    @RequestMapping("/toAddBook")
    public String toAddPaper(){
        return "addBook";
    }
//  从addBook.jsp页面,返回的书籍数据,添加到数据库
//添加书籍的请求
    @RequestMapping("/addBook")
    public String addPaper(Books books) {
        System.out.println("books==>"+books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="../../css/normalize.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="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label for="bkname">书籍名称:</label>
            <input type="text" class="form-control" id="bkname" name="bookName" required>
        </div>
        <div class="form-group">
            <label for="bknum">书籍数量:</label>
            <input type="text" class="form-control" id="bknum" name="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="bkdetail">书籍描述:</label>
            <input type="text" class="form-control" id="bkdetail" name="detail" required>
        </div>
        <button type="submit" class="btn btn-primary">添加</button>
        <a href="${pageContext.request.contextPath}/book/allBook" class="btn btn-default">取消</a>
    </form>


</div>
</body>
</html>

修改书籍

/////   方法三：修改书籍
    // 先根据ID查询到书籍信息返回至修改页面,
    // 在updateBook页面 将id设为隐藏域,再将书籍信息更改后重定向到allBook

    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(Model model,int id){
        Books books = bookService.queryBookById(id);
        System.out.println(books);
        model.addAttribute("book",books);
        return "updateBook";
    }

    @RequestMapping("/updateBook")
    public String updateBook(Model model,Books book){
        System.out.println("updateBook==>"+book);
        bookService.updateBook(book);
        Books books = bookService.queryBookById(book.getBookID());
        model.addAttribute("books",books);
        return "redirect:/book/allBook";
    }

updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改信息</title>
    
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="../../css/normalize.css" rel="stylesheet">
</head>
<body>
<div class="container">

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

    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
<%--        修改书籍需要用到BookID  设置隐藏域   --%>
        <input type="hidden" name="bookID" value="${book.getBookID()}"/>
        <div class="from-group">
            <label>书籍名称:</label>
            <input  class="form-control" type="text" name="bookName" value="${book.getBookName()}" required/>
        </div>
        <div class="form-group">
            <label>书籍数量:</label>
            <input class="form-control" type="text" name="bookCounts" value="${book.getBookCounts()}" required/>
        </div>
        <div class="form-group">
            <label>书籍详情:</label>
            <input class="form-control" type="text" name="detail" value="${book.getDetail() }" required/>
        </div>
        <div class="form-group">
            <input class="form-control" type="submit" value="修改"/>
        </div>
        <div class="form-group">
            <a href="${pageContext.request.contextPath}/book/allBook" class="align-middle form-control">取消</a>
        </div>
    </form>

</div>

删除书籍

////  方法四:  删除书籍

    @RequestMapping("/del/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id){
        System.out.println("删除书籍的ID==>"+id);
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

按书名查询书籍(找不到则显示全部书籍,并报错)

///查询书籍

    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
//        boolean q = false;
        List<Books> list = bookService.queryBookByName(queryBookName);
        for (Books books : list) {
            //红色输出
            System.err.println("queryBookName==>"+books);
        }
        if (list.size() == 0){
            list = bookService.queryAllBook();
            model.addAttribute("error","未查到");
            System.out.println("===未查到===");
        }
        model.addAttribute("list",list);
        return "allBook";
    }

小结(`MySQL数据库主键无法连续自增问题`)

MySQL数据库:

解决单条数据id自增不连续问题

创建的表的类型为InnoDB类型,为了提升性能设置AUTO_INCREMNT不会回退,因此innoDB使用了不连续的自增值

解决:

使用Mybatis中的标签

<!-- 当用户表为空时，id设置为1
当用户表不为空时，id设置为当前最大id加1   -->
    <insert id="addBook" parameterType="Books">
        <selectKey keyProperty="bookID" resultType="int" order="BEFORE">
            select if(max(bookID) is null,1,max(bookID)+1) as bookID from books
        </selectKey>
        insert into books (bookID,bookName,bookCounts,detail)
        values (#{bookID},#{bookName},#{bookCounts},#{detail});
    </insert>

posted @ 2021-02-16 12:57 李海家阅读(56) 评论(0) 编辑收藏举报

会员力量，点亮园子希望

刷新页面返回顶部

学无止境

红白简约，一份暖心，一份宁静

SSM整合

SSM框架整合

环境

搭建数据库(MySQL)

基本项目的搭建

新建maven项目,添加web支持

导入相关的maven依赖

3.Maven资源过滤问题

建立基本结构和配置框架

Mybatis层

数据库配置文件db.properties (设为模版,同上), --> 在Spring配置文件中读取

IDEA关联数据库(idea自带的数据库链接)

编写(完善配置信息注意标签的顺序)MyBatis的核心配置文件(mybatis-config.xml)

编写数据库对应的实体类com.inspur.pojo.Books

使用Lombok插件

编写Dao层的Mapper接口

编写接口对应的Mapper.xml文件(最好与其接口同名/同路径)

Spring层

配置 `Spring整合MyBatis` ,这里使用c3p0连接池;

我们去编写Spring整合MyBatis的相关配置文件; Spring-dao.xml (多个Spring配置文件,整合,分层管理)

Spring整合Service层

SpringMVC层

Spring配置整合文件,applicationContext.xml

配置文件,暂时结束! Controller 和视图层编写

小结(`MySQL数据库主键无法连续自增问题`)

公告

学无止境

红白简约，一份暖心，一份宁静

SSM整合

SSM框架整合

环境

搭建数据库(MySQL)

基本项目的搭建

新建maven项目,添加web支持

导入相关的maven依赖

3.Maven资源过滤问题

建立基本结构和配置框架

Mybatis层

数据库配置文件db.properties (设为模版,同上), --> 在Spring配置文件中读取

IDEA关联数据库(idea自带的数据库链接)

编写(完善配置信息 注意标签的顺序)MyBatis的核心配置文件(mybatis-config.xml)

编写数据库对应的实体类com.inspur.pojo.Books

使用Lombok插件

编写Dao层的Mapper接口

编写接口对应的Mapper.xml文件(最好与其接口 同名/同路径)

Spring层

配置 Spring整合MyBatis ,这里使用c3p0连接池;

我们去编写Spring整合MyBatis的相关配置文件; Spring-dao.xml (多个Spring配置文件,整合,分层管理)

Spring整合Service层

SpringMVC层

Spring配置整合文件,applicationContext.xml

配置文件,暂时结束! Controller 和 视图层编写

小结(MySQL数据库主键无法连续自增问题)

公告

编写(完善配置信息注意标签的顺序)MyBatis的核心配置文件(mybatis-config.xml)

编写接口对应的Mapper.xml文件(最好与其接口同名/同路径)

配置 `Spring整合MyBatis` ,这里使用c3p0连接池;

配置文件,暂时结束! Controller 和视图层编写

小结(`MySQL数据库主键无法连续自增问题`)