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MyBatis与Spring的整合
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MyBatis与Spring的整合 

MyBatis与Spring的整合的入门案例

   直接使用MyBatis框架的SqlSession访问数据库并不简便. Mybatis框架的重点是SQL映射文件.

代码结构图

https://s2.ax1x.com/2019/11/02/KLS5Af.png

所需要的相关的jar包

  • Spring的jar包
  • MyBatis的jar包
  • MyBatis与Spring的整合jar包
  • 这里使用c3p0数据源
  • 连接数据库的驱动jar包

pom.xml

    <dependencies>

        <!--Spring相关jar包-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>



<!--        Mybatis相关jar包-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.25</version>
            <!--      <scope>test</scope>-->
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

<!--        spring-mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>



        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.43</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

    </dependencies>

数据库结构

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `address` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
)

实体类User.java

package cn.lacknb.beans;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Repository;

@Repository
public class User {

    private Integer id;
    @Value("王二")
    private String username;
    @Value("89898998")
    private String password;
    @Value("弦歌大道")
    private String address;

    public User(String username, String password, String address) {
        this.username = username;
        this.password = password;
        this.address = address;
    }

    public User() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

dao层UserDao.java

package cn.lacknb.dao;

import cn.lacknb.beans.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserDao {

    @Insert("insert into user(username, password, address) values(#{username}, #{password}, #{address})")
    int addUser(User user);

    @Delete("delete from user where id=#{id}")
    int deleteUser(@Param("id") Integer id);

    @Update("update user set username=#{username}, password=#{password}, address=#{address} where id = #{id}")
    int updateUser(User user);

    @Select("select * from user where id = #{id}")
    User find(@Param("id") Integer id);

    @Select("select * from user")
    List<User> findAll();

}

service层UserService和UserServiceImpl

package cn.lacknb.service;

import cn.lacknb.beans.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

public interface UserService {

    int addUser(User user);
    int deleteUser(Integer id);
    int updateUser(User user);
    User find(Integer id);
    List<User> findAll();

}


package cn.lacknb.service;

import cn.lacknb.beans.User;
import cn.lacknb.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    public int addUser(User user) {
        return userDao.addUser(user);
    }

    public int deleteUser(Integer id) {
        return userDao.deleteUser(id);
    }

    public int updateUser(User user) {
        return userDao.updateUser(user);
    }

    public User find(Integer id) {
        return userDao.find(id);
    }

    public List<User> findAll() {
        return userDao.findAll();
    }
}

applicationContext.xml、mybatis-config.xml和jdbc.properties

  • 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"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://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 https://www.springframework.org/schema/tx/spring-tx.xsd">


    <!--    需要扫描的包(包括子包), 使注解生效-->
    <context:component-scan base-package="cn.lacknb"/>
<!--    读取properties文件-->
<!--    <context:property-placeholder location="xml/jdbc.properties"/>-->
<!--    另一种读取多个properties文件|-->
    <bean id="jdbcProperty" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath*:/xml/jdbc.properties</value>
            </list>
        </property>
    </bean>
<!--    配置数据源-->

<!--    配置数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

<!--        添加事务支持-->
<!--    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">-->
<!--        <property name="dataSource" ref="dataSource"/>-->
<!--    </bean>-->
<!--    &lt;!&ndash;    开启事务注解&ndash;&gt;-->
<!--    <tx:annotation-driven transaction-manager="txManager"/>-->

<!--    配置mybatis工厂, 同时指定数据源, 并与mybatis完美结合-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--        configlocation的属性值为mybatis的核心配置文件-->
        <property name="configLocation" value="classpath:xml/mybatis-config.xml"/>
    </bean>

<!--    Mapper代理开发,使用Spring自动扫描mybatis的接口并装配-->
<!--spring指定包中所有被@Mapper注解标注的接口自动装配为mybatis的映射接口-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        mybatis-Spring组件的扫描器-->
        <property name="basePackage" value="cn.lacknb"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

  • mybatis-config.xml

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>


    <!--  引入外部配置文件  加入变量propertis-->
    <properties resource="xml/jdbc.properties"/>


    <settings>
        <!--        开启mybatis支持延迟加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!--        任何方法的调用都会加载该对象的所有属性，否则每个属性都会按需加载-->
        <setting name="aggressiveLazyLoading" value="false"/>

        <!--        开启二级缓存     默认为true-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
    <!--    配置别名-->

    <typeAliases>
        <package name="cn.lacknb.beans"/>
    </typeAliases>

    <!--    起别名-->
    <!--    <typeAliases>-->
    <!--        <typeAlias type="MyUser" alias="beans"/>-->
    <!--    </typeAliases>-->
    <!--    配置环境-->
<!--    <environments default="development">-->
<!--        &lt;!&ndash;       配置mysql的环境， 和default保持一致&ndash;&gt;-->
<!--        <environment id="development">-->
<!--            &lt;!&ndash;           配置事务的类型　ＪＤＢＣ  &ndash;&gt;-->
<!--            <transactionManager type="JDBC"/>-->
<!--            &lt;!&ndash;            配置数据源（连接池）&ndash;&gt;-->
<!--            <dataSource type="POOLED">-->
<!--                <property name="driver" value="${jdbc.driver}"/>-->
<!--                <property name="url" value="${jdbc.url}"/>-->
<!--                <property name="password" value="${jdbc.password}"/>-->
<!--                <property name="username" value="${jdbc.username}"/>-->

<!--            </dataSource>-->
<!--        </environment>-->
<!--    </environments>-->
    <!--    指定带有注解的dao接口所在的位置-->
    <mappers>
        <package name="cn.lacknb.dao"/>
    </mappers>


</configuration>

  • jdbc.properties

    jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///jdbc_template?useSSL=false
jdbc.username=root
jdbc.password=123456

log4j.properties

#log4j.rootLogger=DEBUG,console
log4j.logger.cn.lacknb.dao.UserDao=DEBUG, console
log4j.additivity.org.apache=true
# 控制台(console)
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%-5p] %d(%r) --> %m %x %n
标题：MyBatis与Spring的整合
作者：gitsilence
地址：https://blog.lacknb.cn/articles/2019/11/03/1577974153209.html