SpringBootMVC04——Mybatis

简介

MyBatis是一个优秀的持久层框架，它对jdbc的操作数据库的过程进行封装，使开发者只需要关注SQL本身，而不需要花费精力去处理例如注册驱动、创建connection、创建statement、手动设置参数、
结果集检索等jdbc繁杂的过程代码。

配置文件

MybatisConfig.xml

SSM中需要配置

数据url
数据库连接池
映射文件
事务
在SpringBoot中整合到property中了

Mapper.xml

namespace
接口绑定 和接口

就可以不用写DAO实现类，Mybatis会通过绑定自动找到要执行的sql语句。

resultMap

结果集对应到实体类的字段到属性映射

xml 方式

传统方式

xml配置

<?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">  
  
<!-- version: $Id$ -->  
<configuration>  
    <!-- 引用JDBC属性的配置文件 -->  
    <properties resource="database.properties" />  
  
    <environments default="development">  
        <environment id="development">  
            <!-- 使用JDBC的事务管理 -->  
            <transactionManager type="JDBC" />  
            <!-- POOLED ：JDBC连接对象的数据源连接池的实现，不直接支持第三方数据库连接池 -->  
            <dataSource type="POOLED">  
                <property name="driver" value="${database.driver}" />  
                <property name="url" value="${database.url}" />  
                <property name="username" value="${database.username}" />  
                <property name="password" value="${database.password}" />  
            </dataSource>  
        </environment>  
  
    </environments>  
  
    <!-- ORM映射文件 -->  
    <mappers>  
        <!-- 注解的方式 -->  
        <mapper class="com.iflytek.dao.mapper.AccountMapper" />  
        <!-- XML的方式 -->  
        <mapper resource="com/mashibing/dao/xml/AccountMapper.xml" />  
        <!-- 这里对于注解，还可以通过<package name="com.mashibing.dao.mapper"/> -->  
    </mappers>  
</configuration>

Service 配置

public class AccountService {  

    public boolean insertAccount(Account account) {  
        boolean flag = false;  
        SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();  
        try {  
            accountMapper accountMapper = sqlSession.getMapper(AccountMapper.class);  
            int result = accountMapper.insert(student);  
            if (result > 0) {  
                flag = true;  
            }  
            sqlSession.commit();  
        } finally {  
            sqlSession.close();  
        }  
        return flag;  
    }  
  

    public Student getAccountById(int id) {  
        SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();  
        try {  
            AccountMapper AccountMapper = sqlSession.getMapper(AccountMapper.class);  
            return AccountMapper.selectByPrimaryKey(id);  
        } finally {  
            sqlSession.close();  
        }  
    }  
  

    public List<Student> getAllStudents() {  
        SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();  
        try {  
            StudentMapper StudentMapper = sqlSession.getMapper(StudentMapper.class);  
            return StudentMapper.selectByExample(new StudentExample());  
        } finally {  
            sqlSession.close();  
        }  
    }  
  

    public boolean updateAccount(Account account) {  
        SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();  
        boolean flag = false;  
        try {  
            AccountMapper AccountMapper = sqlSession.getMapper(AccountMapper.class);  
            int result = AccountMapper.updateByPrimaryKey(Account);  
            if (result > 0) {  
                flag = true;  
            }  
            sqlSession.commit();  
        } finally {  
            sqlSession.close();  
        }  
        return flag;  
  
    }  
  
 
    public boolean deleteAccount(int id) {  
        SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();  
        boolean flag = false;  
        try {  
            AccountMapper AccountMapper = sqlSession.getMapper(AccountMapper.class);  
            int result = AccountMapper.deleteByPrimaryKey(id);  
            if (result > 0) {  
                flag = true;  
            }  
            sqlSession.commit();  
        } finally {  
            sqlSession.close();  
        }  
        return flag;  
    }  
  
}

与SpringBoot整合

引入依赖

<?xml version="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>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springboot03-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot03-mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

mapper

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mashibing.springboot.mapper.AccountMapper">
   
   <resultMap type="com.mashibing.springboot.mapper.Account" id="BaseResultMap">
   
       <result column="login_name" property="loginName"/>
       <result column="password" property="password"/>
   
   </resultMap>
   
   
    <insert id="save" parameterType="Account">
        INSERT INTO account(login_name,password)
        VALUES
        (
        #{loginName},#{password}
        )
    </insert>
    
    <select id="findAll" resultMap="BaseResultMap">
        select * from account
    </select>
    
</mapper>

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf8&useSSL=false&serverTimezone=UTC
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=840416

# 用来实例化mapper接口
mybatis.type-aliases-package=com.mashibing.springboot.mapper
# 对应的sql映射
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

AccountMapper

package com.mashibing.springboot.mapper;

import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface AccountMapper {

    void save(Account account);
}

Account

public class Account {
    private int id;
    private String loginName;
    private String password;
    private String nickName;
    private int age;
    private String location;
    private int banlance;
    public int getId() {

显示日志

logging.level.com.mashibing.springboot.mapper=debug

注解查询

@Select("select * from account1")
    List<Account> findAll();

查找mapper接口

在入口加入 MapperScan

@MapperScan("com.mashibing.springboot.mapper") public class Springboot03MybatisApplication {

每一个mapper接口上加入

@Mapper public interface AccountMapper {

Mapper 自动生成

eclipse插件市场搜素

MyBatis Generator

图形化

https://github.com/zouzg/mybatis-generator-gui

分页查询

依赖

<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.12</version>
</dependency>

Service

    public Object findPage(int pageNum, int pageSize) {

        PageHelper.startPage(pageNum, pageSize);
        AccountExample example = new AccountExample();
        return mapper.selectByExample(example );
    }

SpringBootMVC04——Mybatis

简介

配置文件

Mapper.xml

xml 方式

传统方式

xml配置

Service 配置

与SpringBoot整合

引入依赖

mapper

application.properties

AccountMapper

Account

显示日志

注解查询

查找mapper接口

在入口加入 MapperScan

每一个mapper接口上加入

Mapper 自动生成

eclipse插件 市场搜素

图形化

分页查询

依赖

Service

猜你喜欢

eclipse插件市场搜素