Version: Next

整合Mybatis

环境依赖

IDEA
Mysql 5.7.19
Tomcat 9
Maven 3.6

数据库环境

闯进啊一个存书数据库表

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,'从进门到进牢');

环境搭建

新建Maven项目
添加WEB支持
Maven依赖
<dependencies>

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>

<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>


<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>


<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>


<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>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
<scope>provided</scope>
</dependency>
</dependencies>
Maven静态资源导出问题
<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>
建包
- pojo
- dao(mapper)
- service
- controller
建resources
- 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>

配置Mybatis

数据库配置文件database.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root
pojo.Books
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}

Dao

public interface BookMapper {

    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(@Param("bookID") int id);

    //修改一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(@Param("bookID") int id);

    //查询所有书
    List<Books> queryAllBooks();
}

Mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.bsx.dao.BookMapper">

<insert id="addBook" parameterType="com.bsx.pojo.Books">
insert into books (bookName, bookCounts, detail) values
(#{bookName}, #{bookCounts}, #{detail});
</insert>

<delete id="deleteBookById">
delete from books where bookID = #{bookID};
</delete>

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

<select id="queryBookById" resultType="com.bsx.pojo.Books">
select * from books where bookID = #{bookID};
</select>

<select id="queryAllBooks" resultType="com.bsx.pojo.Books">
select * from books
</select>
</mapper>
将mapper.xml绑定到mybatis配置文件中
<mappers>
<mapper resource="com/bsx/dao/BookMapper.xml"/>
</mappers>

Service

BookService
public interface BookService {
//增加一本书
int addBook(Books books);

//删除一本书
int deleteBookById(@Param("bookID") int id);

//修改一本书
int updateBook(Books books);

//查询一本书
Books queryBookById(@Param("bookID") int id);

//查询所有书
List<Books> queryAllBooks();
}
BookServiceImpl
- 组合一个BookMapper对象
- 写一个构造方法或者set方法供Spring实现依赖注入

@Service("bookService")
public class BookServiceImpl implements BookService {

    //业务层调用Dao,组合一个BookMapper
    //也可以用构造器注入，设置一个构造方法就行
    @Autowired
    private BookMapper bookMapper;

    //用来Spring Set注入
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

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

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

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

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

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

整合Mybatis#

环境依赖#

数据库环境#

环境搭建#

配置Mybatis#

Dao#

Service#

整合Mybatis

环境依赖

数据库环境

环境搭建

配置Mybatis

Dao

Service