SSM框架整合（一）Mybatis層
阿新 • • 發佈：2021-06-24
環境搭建
一、資料庫環境
CREATE DATABASE `ssmbuild`; USE `ssmbuild`; DROP TABLE IF EXISTS `books`; CREATE TABLE `books` ( `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '書id', `bookName` VARCHAR(100) NOT NULL COMMENT '書名', `bookCounts` INT(11) NOT NULL COMMENT '數量', `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,'從入門到放棄'), (2,'MySQL',10,'從刪庫到跑路'), (3,'Linux',5,'從進門到進牢');
二、基本環境
1、新建一Maven專案ssmbuild，新增web的支援
2、匯入相關的依賴和靜態資源過濾問題！
<!--依賴：junit,資料庫驅動，連線池，servlet，jsp，mybatis,mybatis-spring--> <dependencies> <!--Junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!--資料庫驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- 資料庫連線池 :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> <!--Lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> </dependency> </dependencies> <!--在build中配置resources，來防止我們資源匯出失敗的問題--> <build> <resources> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build>
3、建立基本結構和配置框架！
com.study.pojo
com.study.dao
com.study.service
com.study.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/springbeans.xsd">
</beans>
三、編寫Mybatis層
1、資料庫配置檔案 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=123456
2、IDEA連線資料庫
3、編寫資料庫對應的實體類com.study.pojo.Books
package com.study.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
4、編寫Dao層的Mapper介面
package com.study.dao;
import com.study.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface BookMapper {
//增加一本書
int addBook(@Param("bookId") Books books);
//刪除一本書
int deleteBook(int id);
//更新一本書
int updateBook(Books books);
//查詢一本書
Books queryBookById(@Param("bookID") int id);
//查詢全部的書
List<Books> queryAllBook();
}
5、編寫介面對應的Mapper.xml檔案
<?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.study.dao.BookMapper">
<!--新增一本書-->
<insert id="addBook" parameterType="Books">
insert into ssmbuild.books (bookName,bookCounts,detail)
values (#{bookName},#{bookCounts},#{detail});
</insert>
<!--刪除一本書-->
<delete id="deleteBookById" parameterType="int">
delete from ssmbuild.books where bookID = #{bookId}
</delete>
<!--更新一本書-->
<update id="updateBook" parameterType="Books">
update ssmbuild.books
set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
where bookID = #{bookID};
</update>
<!--根據ID查詢一本書-->
<select id="queryBookById" parameterType="Books">
select * from ssmbuild.books where bookID = #{bookID}
</select>
<!--查詢所有的書-->
<select id="queryAllBook" parameterType="Books">
select * from ssmbuild.books
</select>
</mapper>
6、編寫MyBatis的核心配置檔案
<?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>
<!--設定別名-->
<typeAliases>
<package name="com.study.pojo"/>
</typeAliases>
<!--註冊mapper-->
<mappers>
<mapper class="com.study.dao.BookMapper"/>
</mappers>
</configuration>
7、編寫service層（業務層在這裡也可理解為代理層）
package com.study.service;
import com.study.pojo.Books;
import java.util.List;
public interface BookService {
//增加一本書
int addBook(Books books);
//刪除一本書
int deleteBook(int id);
//更新一本書
int updateBook(Books books);
//查詢一本書
Books queryBookById(int id);
//查詢全部的書
List<Books> queryAllBook();
}
8、編寫介面實現類(service層調dao層：組合dao層)
package com.study.service;
import com.study.dao.BookMapper;
import com.study.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService{
//service層調dao(mapper)層
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
@Override
public int addBook(Books books) {
return bookMapper.addBook(books);
}
@Override
public int deleteBook(int id) {
return bookMapper.deleteBook(id);
}
@Override
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
@Override
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
@Override
public List<Books> queryAllBook() {
return bookMapper.queryAllBook();
}
}