10-ssm整合-Mybatis层

ssm整合-Mybatis层 （重中之重）

第一步数据库

/*
Navicat MySQL Data Transfer

Source Server         : localhost
Source Server Version : 80023
Source Host           : localhost:3306
Source Database       : ssmbuild

Target Server Type    : MYSQL
Target Server Version : 80023
File Encoding         : 65001

Date: 2021-07-24 16:07:48
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for books
-- ----------------------------
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
  `bookID` int NOT NULL AUTO_INCREMENT,
  `bookName` varchar(100) COLLATE utf8mb4_general_ci NOT NULL,
  `bookCounts` int NOT NULL,
  `detail` varchar(200) COLLATE utf8mb4_general_ci NOT NULL,
  PRIMARY KEY (`bookID`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

-- ----------------------------
-- Records of books
-- ----------------------------
INSERT INTO `books` VALUES ('1', 'Java', '2', '从入门到放弃');
INSERT INTO `books` VALUES ('2', 'mysql', '1', '从删库到跑路');
INSERT INTO `books` VALUES ('3', 'linux', '4', '从进门到进牢');

第二步创maven项目导入依赖

 <!--依赖 junit 数据库驱动 servlet jsp mybatis mybatis-spring spring-->
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</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>1.16.10</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
    </dependencies>
    <!--    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>

第三步 包结构构建出来 还有resources资源

包结构
com.kuang.pojo
com.kuang.dao
com.kuang.controller
com.kuang.service


resources资源
applicationContext.xml
mybatis-config.xml
database.properties

spring-dao.xml
spring-mvc.xml
spring-service.xml

第四步 数据库

第一小步 database.properties

#如果使用的是mysql8.0+，增加一个时区的配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
jdbc.username=root
jdbc.password=root

第二小步 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>
<typeAliases>
    <package name="com.kuang.pojo"/>
</typeAliases>

    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>
</configuration>

第五步，实体类Books

package com.kuang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private  String detail;
}

第六步 dao层 接口BookMapper

package com.kuang.dao;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

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);
        //查询全部书
        List<Books> queryAllBook();

        Books queryBookByName(@Param("bookName")String bookName);
}

第七步 BookMapper.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.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>
    
    <select id="queryBookByName" resultType="Books">
        select * from ssmbuild.books where bookName=#{bookName}
    </select>
</mapper>

写完记得绑定Mappers

---

第八步 service层 BookService

package com.kuang.service;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books books);
    //删除一本书
    int deleteBookByID( int id);
    //修改一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(int id);
    //查询全部书
    List<Books> queryAllBook();


    Books queryBookByName(@Param("bookName")String bookName);


}

第九步 BookServiceImpl

package com.kuang.service;

import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{
    private BookMapper bookMapper;

    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> queryAllBook() {
        return bookMapper.queryAllBook();
    }

    public Books queryBookByName(String bookName) {
        return bookMapper.queryBookByName(bookName);
    }
}