SpringMVC第七阶段：SpringMVC的增删改查（01）

SpringMVC的增删改查

1、准备单表的数据库

drop database if exists springmvc;

create database springmvc;

use springmvc; 

##创建图书表
create table t_book(
	`id` int(11) primary key auto_increment, 	## 主键
	`name` varchar(50) not null,				## 书名 
	`author` varchar(50) not null,				## 作者
	`price` decimal(11,2) not null,				## 价格
	`sales` int(11) not null,					## 销量
	`stock` int(11) not null					## 库存
);


## 插入初始化测试数据
insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '怎样拐跑别人的媳妇' , '龙伍' , 68, 99999 , 52);

insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '木虚肉盖饭' , '小胖' , 16, 1000 , 50);

insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , 'C++编程思想' , '刚哥' , 45.5 , 14 , 95);

insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '蛋炒饭' , '周星星' , 9.9, 12 , 53);
 
insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '赌神' , '龙伍' , 66.5, 125 , 535);

insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '西游记' , '罗贯中' , 12, 19 , 9999);

insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '水浒传' , '华仔' , 33.05 , 22 , 88);
 
insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '操作系统原理' , '刘优' , 133.05 , 122 , 188);
 
insert into t_book(`id` , `name` , `author` , `price` , `sales` , `stock`) 
values(null , '数据结构 java版' , '封大神' , 173.15 , 21 , 81);

## 查看表内容
select id,name,author,price,sales,stock from t_book;

2、SpringMVC的增，删，改，查

需要导入的jar包有:

druid-1.1.9.jar
junit_4.12.jar
mysql-connector-java-5.1.37-bin.jar
org.hamcrest.core_1.3.0.jar
spring-aop-5.2.5.RELEASE.jar
spring-beans-5.2.5.RELEASE.jar
spring-context-5.2.5.RELEASE.jar
spring-core-5.2.5.RELEASE.jar
spring-expression-5.2.5.RELEASE.jar
spring-jcl-5.2.5.RELEASE.jar
spring-jdbc-5.2.5.RELEASE.jar
spring-orm-5.2.5.RELEASE.jar
spring-test-5.2.5.RELEASE.jar
spring-tx-5.2.5.RELEASE.jar
spring-web-5.2.5.RELEASE.jar
spring-webmvc-5.2.5.RELEASE.jar

在src目录下记得配置 jdbc.properties属性配置文件:

SpringMVC的配置文件内容如下:

<?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">

    <context:component-scan base-package="com"></context:component-scan>

    <!--
        配置视图解析器
    -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/book/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 加载jdbc.properties属性配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!-- 配置数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${user}" />
        <property name="password" value="${password}" />
        <property name="url" value="${url}" />
        <property name="driverClassName" value="${driverClassName}" />
        <property name="initialSize" value="${initialSize}" />
        <property name="maxActive" value="${maxActive}" />
    </bean>

    <!-- 配置用于执行sql语句的jdbcTemplate工具类 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
</beans>

web.xml中的配置内容如下:

<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">
    <!-- 配置前端控制器 -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

3、创建实体bean对象

public class Book {
    private Integer id;
    private String name;
    private String author;
    private BigDecimal price;
    private Integer sales;
    private Integer stock;
}

4、创建BookDao以及测试

@Repository
public class BookDao {

    @Autowired
    JdbcTemplate jdbcTemplate;

    public int saveBook(Book book) {
        String sql = "insert into t_book( `name`,`author`,`price`,`sales`,`stock`) values(?,?,?,?,?)";
        return jdbcTemplate.update(sql, book.getName(), book.getAuthor(), book.getPrice(), book.getSales(), book.getStock());
    }

    public int deleteBookById(Integer id) {
        String sql = "delete from t_book where id = ?";
        return jdbcTemplate.update(sql, id);
    }

    public int updateBook(Book book) {
        String sql = "update t_book set `name`=?,`author`=?,`price`=?,`sales`=?,`stock`=? where id = ?";
        return jdbcTemplate.update(sql, book.getName(), book.getAuthor(),
                book.getPrice(), book.getSales(), book.getStock(), book.getId());
    }

    public Book queryBookById(Integer id){
        String sql = "select `name`,`author`,`price`,`sales`,`stock`,`id` from t_book where id = ?";
        return jdbcTemplate.queryForObject(sql,new BeanPropertyRowMapper<Book>(Book.class), id );
    }

    public List<Book> queryBooks(){
        String sql = "select `name`,`author`,`price`,`sales`,`stock`,`id` from t_book";
        return jdbcTemplate.query(sql,new BeanPropertyRowMapper<Book>(Book.class));
    }

}

5、创建BookService以及测试

@Service
public class BookService {

    @Autowired
    BookDao bookDao;

    public void saveBook(Book book){
        bookDao.saveBook(book);
    }

    public void deleteBookById(Integer id){
        bookDao.deleteBookById(id);
    }

    public void updateBook(Book book){
        bookDao.updateBook(book);
    }

    public Book queryBookById(Integer id){
        return bookDao.queryBookById(id);
    }

    public List<Book> queryBooks(){
        return bookDao.queryBooks();
    }

}

6、拷贝CRUD页面到WebContent目录下

从SpringMVC第二个的目录里,笔记目录中的CRUD目录

7、配置springMVC的视图解析器到springmvc.xml配置文件中

<!--
    配置视图解析器
-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/book/" />
    <property name="suffix" value=".jsp" />
</bean>