MybatisPlus整合spring+mybatis

一.pom.xml【重點】

1.代碼塊

<properties>
    <spring.version>5.1.6.RELEASE</spring.version>
</properties>
<dependencies>
    <!-- mybatis-plus插件依賴 -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus</artifactId>
        <version>3.1.1</version>
    </dependency>
    <!-- MySql -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <!-- 連接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.11</version>
    </dependency>
    <!--簡化bean代碼的工具包-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
        <version>1.18.4</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.6.4</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${spring.version}</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

2.圖解

二.數據庫配置文件jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/db2
jdbc.username=root
jdbc.password=root

三.applicationContext.xml【重點】

1.代碼塊

<?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"
       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">
    <!-- 掃描包路徑 -->
    <context:property-placeholder location="classpath*:jdbc.properties" />
    <!-- 定義數據源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="maxActive" value="10"/>
        <property name="minIdle" value="5"/>
    </bean>
    <!--這裏使用MP提供的sqlSessionFactory，完成了Spring與MP的整合-->
    <bean id="sqlSessionFactory"
          class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--掃描mapper接口，使用的依然是Mybatis原生的掃描器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="mapper"/>
    </bean>
</beans>

2.範例

四.日誌文件

log4j.rootLogger=DEBUG,A1 
log4j.appender.A1=org.apache.log4j.ConsoleAppender 
log4j.appender.A1.layout=org.apache.log4j.PatternLayout 
log4j.appender.A1.layout.ConversionPattern=[%t] [%c]-[%p] %m%n

五.映射配置文件

1.代碼塊

<?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="mapper.UserMapper">
    <select id="findAll" resultType="pojo.User">
        select * from tb_user
    </select>
</mapper>

2.範例

六.實體類【重點】

1.代碼塊

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor  //空參構造方法
@AllArgsConstructor //全參構造方法
@TableName("tb_user")
public class User {
    private Long id;
    private String userName;
    private String password;
    private String name;
    private Integer age;
    private String email;
}

2.範例

七.dao層【重點】

1.代碼塊

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Repository;
import pojo.User;
import java.util.List;
/**
 * mybatisPlus整合spring
 */
public interface UserMapper extends BaseMapper<User> {
    public List<User> findAll();
}

2.範例

八.測試類

1.代碼塊

import mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.web.context.support.XmlWebApplicationContext;
import pojo.User;
import java.util.List;
/**
 * 測試spring整合mybatisPlus
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class SpringTest {
    @Autowired
    private UserMapper userMapper;
    @Test
    public void test01(){
        List<User> users = userMapper.selectList(null);
        for (User user:users) {
            System.out.println(user);
        }
    }

2.範例

九.源碼

mybatis-plus.rar