spring集成mybatis

1、新建一个javaEE web项目

2、加入相关依赖的坐标

XML 复制代码

<dependencies>
    <!--数据系列：mybatis,mysgl,druid数据源,junit-->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.16</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.2</version>
    </dependency>
    <!-- 阿里数据源 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.10</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>provided</scope>
    </dependency>
    <!--spring系列：spring-context,aop,jdbc-->
    <!-- spring-context -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.2.RELEASE</version>
    </dependency>
    <!-- spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.2.RELEASE</version>
    </dependency>
    <!--aop-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>5.2.2.RELEASE</version>
    </dependency>
</dependencies>

3、创建相应的包和类，以登录为例

java 复制代码

package com.ffyc.ssm.model;

import lombok.Data;
import org.springframework.format.annotation.DateTimeFormat;

import java.util.Date;
@Data
public class Admin {
    private Integer id;
    private String account;
    private String password;
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date birthday;
}

java 复制代码

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.4</version>
    <scope>provided</scope>
</dependency>

@Data注解在类上，会为类的所有属性自动生成setter/getter、equals、canEqual、hashCode、toString方法，如为final属性，则不会为该属性生成setter方法。

java 复制代码

@Service(value = "loginService")
@Transactional
public class LoginService {
    //注入dao层对象
    @Autowired
    LoginDao loginDao;//注入的直接是接口的代理对象sqlsession.getMapper();

    public Admin login(Admin admin){
        Admin a=loginDao.Login(admin);
        return a;
    }
}

java 复制代码

@Repository
public interface LoginDao {
    public Admin Login(Admin admin);
}

java 复制代码

<?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">
<!--映射文件与操作接口绑定的-->
<mapper namespace="com.ffyc.ssm.dao.LoginDao">

    <select id="Login" resultType="com.ffyc.ssm.model.Admin">
        select * from admin where account=#{account} and password=#{password}
    </select>
</mapper>

4、创建并配置spring和mybatis配置文件

1.mybatis配置文件（mybatis-config.xml）

java 复制代码

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings> <!--常用设置-->
        <!--启用日志功能,在运行时,可以将实际执行的sgL细节打印到控制台-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <setting name="cacheEnabled" value="true"/>  <!--全局开启二级缓存-->
    </settings>

    <typeAliases> <!--配置类型简称-->
        <package name="com.ffyc.ssm.model"/>
    </typeAliases>
</configuration>

2.数据库连接配置

mybatis-config.xml

java 复制代码

classDriverName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/ssmdb?serverTimezone=Asia/Shanghai
uname=root
pwd=123456

db.xml

java 复制代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--配置jdbc功能-->
    <!--负责加载config.properties文件-->
    <context:property-placeholder location="classpath:config.properties"></context:property-placeholder>
    <!--spring统一管理数据库链接对象-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${classDriverName}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${uname}"></property>
        <property name="password" value="${pwd}"></property>
        <property name="initialSize" value="5"></property>
        <property name="maxActive" value="10"></property>
    </bean>

    <!-- 配置spring事务管理类, 并注入数据源 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--开启注解事务管理-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

3.spring集成mybatis

Spring 集成 Mybatis 其核心是将 SqlSessionFactory 交由 Spring 管理，并由 Spring 管理对 dao 接口的代理实现。

3.1 导入 mybatis jar 包

XML 复制代码

<!--spring集成mybatis框架-->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.1</version>
</dependency>

3.2 配置 sqlSessionFactory，spring-mybatis.xml中

XML 复制代码

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--导入数据库连接 以及事务管理配置-->
    <import resource="classpath:db.xml"></import> <!--target/classes下的-->

    <!--让spring框架生成sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"></property>
        <!--配置mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!--扫描SQL映射文件-->
        <property name="mapperLocations" value="classpath:mappers/*Mapper.xml">
        </property>
    </bean>

    <!--让spring框架生成接口代理对象-->
    <bean id="mapperFactory" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ffyc.ssm.dao"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory">
        </property>
    </bean>
</beans>

4.spring.xml

spring.xml中需要导入spring-mybatis.xml，spring-mybatis.xml中导入db.xml

XML 复制代码

<!--spring.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    <!--开启注解扫描-->
    <context:component-scan base-package="com.ffyc.ssm"> </context:component-scan>

    <!--开启自动代理-->
    <aop:aspectj-autoproxy />

    <!--导入mybatis配置文件-->
    <import resource="classpath:spring-mybatis.xml"></import>


</beans>

5、测试

java 复制代码

public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext app=new ClassPathXmlApplicationContext("spring.xml");
        LoginService loginService=app.getBean("loginService",LoginService.class);
        Admin admin=new Admin();
        admin.setAccount("admin");
        admin.setPassword("admin");
        Admin a=loginService.login(admin);
        System.out.println(a);
    }
}