SSM整合：mybatis层-P17

 首先构建新的项目。

MYSQL：

在mysql中创建我们需要的表

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');

注意：分段执行，不要一次性全部执行。

接着直接在IDEA中新建maven项目即可。

Mybatis层：

 

 BookMapper（dao层接口）

package com.Li.dao;
 
import com.Li.pojo.Books;
import org.apache.ibatis.annotations.Param;
 
import java.util.List;
 
public interface BookMapper {
 
    //增加一个Book
    int addBook(Books book);
 
    //根据id删除一个Book
    int deleteBookById(@Param("bookId") int id);
 
    //更新Book
    int updateBook(Books books);
 
    //根据id查询,返回一个Book
    Books queryBookById(@Param("bookId") int id);
 
    //查询全部Book,返回list集合
    List queryAllBook();
 
}

BookMapper.xml（编写dao层的映射文件，具体的sql语句。CRUD）

"1.0" encoding="UTF-8" ?>
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="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName,bookCounts,detail)
        values (#{bookName}, #{bookCounts}, #{detail})
    insert>
 
    
    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookID}
    delete>
 
    
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
        where bookID = #{bookID}
    update>
 
    
    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books
        where bookID = #{bookID}
    select>
 
    
    <select id="queryAllBook" resultType="Books">
        SELECT * from ssmbuild.books
    select>
 
mapper>

Books（实体类的创建）

package com.Li.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;
}

BookService（与dao层接口一样）

package com.Li.service;
 
import com.Li.pojo.Books;
import org.apache.ibatis.annotations.Param;
 
import java.util.List;
 
public interface BookService {
 
    //增加一本书
    int addBook(Books book);
 
    //删除一本书
    int deleteBookById(int id);
 
    //更新一本书
    int updateBook(Books books);
 
    //查询一本书
    Books queryBookById(int id);
 
    //查询全部书
    List queryAllBook();
 
}

BookServiceImpl（引用了dao层，相当于是代理模式，代理了dao层。并且还可以在dao层的内容上加自己的内容）

package com.Li.service;
 
import com.Li.dao.BookMapper;
import com.Li.pojo.Books;
 
import java.util.List;
 
public class BookServiceImpl implements BookService{
 
    //service调dao层：组合dao层
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
 
    @Override
    public int addBook(Books book) {
        return bookMapper.addBook(book);//业务层调dao层
    }
 
    @Override
    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }
 
    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }
 
    @Override
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }
 
    @Override
    public List queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

mybatis-config.xml

"1.0" encoding="UTF-8" ?>
configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
 
    
    <typeAliases>
        <package name="com.Li.pojo"/>
    typeAliases>
 
    <mappers>
        <mapper class="com.Li.dao.BookMapper"/>
    mappers>
 
configuration>

pom.xml

"1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
 
    <groupId>com.LigroupId>
    <artifactId>ssmbuildartifactId>
    <version>1.0-SNAPSHOTversion>
 
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>
 
 
    
    <dependencies>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>8.0.29version>
        dependency>
        
        <dependency>
            <groupId>com.mchangegroupId>
            <artifactId>c3p0artifactId>
            <version>0.9.5.2version>
        dependency>
 
        
        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>servlet-apiartifactId>
            <version>2.5version>
        dependency>
        <dependency>
            <groupId>javax.servlet.jspgroupId>
            <artifactId>jsp-apiartifactId>
            <version>2.2version>
        dependency>
        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>jstlartifactId>
            <version>1.2version>
        dependency>
 
        
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.5.2version>
        dependency>
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatis-springartifactId>
            <version>2.0.2version>
        dependency>
 
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>5.1.9.RELEASEversion>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-jdbcartifactId>
            <version>5.1.9.RELEASEversion>
        dependency>
 
        
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>1.18.24version>
        dependency>
    dependencies>
 
 
    
    <build>
        <resources>
            <resource>
                <directory>src/main/javadirectory>
                <includes>
                    <include>**/*.propertiesinclude>
                    <include>**/*.xmlinclude>
                includes>
                <filtering>falsefiltering>
            resource>
            <resource>
                <directory>src/main/resourcesdirectory>
                <includes>
                    <include>**/*.propertiesinclude>
                    <include>**/*.xmlinclude>
                includes>
                <filtering>falsefiltering>
            resource>
        resources>
    build>
 
project>

 这两个为spring层服务，所以mybatis层还不需要实现具体内容。

这就是mybatis层的实现。