0
点赞
收藏
分享

微信扫一扫

Mybatis-Plus入门 基础篇(2)

微笑沉默 2022-01-24 阅读 39
javaintellij-ideamavenmybatismysql

文章目录

本次学习目标

使用Spring + Mybatis + mybatis-plubs 来完成对于数据库的操作
在本次学习中我们引入了Spring框架，数据源、构建等工作就交给了Spring管理。

创建运行环境

运行环境与上一篇文章( 基础篇1)大体相同
在这里插入图片描述

UserMapper

package com.tong1.mp.simple.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.tong1.mp.simple.pojo.User;

public interface UserMapper extends BaseMapper<User> {
}

从上可知 UserMapper继承于BaseMapper 那么BaseMapper有什么功能呢
在这里插入图片描述
我们查看可知 BaseMapper里面基本上实现了增删改查的功能

User实体类

package com.tong1.mp.simple.pojo;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    @TableName("tb_user")
    public class User {
        private Long id;
        private String userName;
        private String password;
        private String name;
        private Integer age;
        private String email;
    }

在基础篇1中已经对此有所解释这里就不再赘述了

配置文件

spring配置文件

<?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">
    <context:property-placeholder location="classpath:*.properties"/>


    <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>


    <bean id="sqlSessionFactory"
          class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--扫描mapper接口，使用的依然是Mybatis原生的扫描器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.tong1.mp.simple.mapper"/>
    </bean>

</beans>

这里来说一下这个sqlSessionFactory
这里使用mybatis-plus提供的sqlSessionFactory，完成了Spring与MP的整合

 <bean id="sqlSessionFactory"
          class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

这个bean对象让我们可以不用写这一部分

String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new
                MybatisSqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

把这一部分的工作交给spring来帮我们自动完成

测试

package mytest;

import com.tong1.mp.simple.mapper.UserMapper;
import com.tong1.mp.simple.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:applicationContext.xml")
public class t1 {
    @Autowired
    private UserMapper userMapper;

    @Test
    public void test(){
        List<User> users = userMapper.selectList(null);
        for (User user : users) {
            System.out.println(user);
        }
    }

}

maven配置文件

基础篇2的maven文件

<?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>
        <artifactId>itcast-mybatis-plus</artifactId>
        <groupId>cn.itcast.mp</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>



    <artifactId>mybatis-plus-spring</artifactId>

    <properties>
        <spring.version>5.1.6.RELEASE</spring.version>
    </properties>


    <dependencies>
        <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>

</project>

基础篇1的maven配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an
  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
  under the License.
-->
<!-- $Id: pom.xml 642118 2008-03-28 08:04:16Z reinhard $ -->
<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/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <packaging>war</packaging>

  <name>mybatis-plus-simple</name>
  <groupId>cn.itcast.mp</groupId>
  <artifactId>mybatis-plus-simple</artifactId>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>

    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.1</version>
      <configuration>
        <source>1.8</source>
        <target>1.8</target>
      </configuration>
    </plugin>

      <plugin>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>maven-jetty-plugin</artifactId>
        <version>6.1.7</version>
        <configuration>
          <connectors>
            <connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
              <port>8888</port>
              <maxIdleTime>30000</maxIdleTime>
            </connector>
          </connectors>
          <webAppSourceDirectory>${project.build.directory}/${pom.artifactId}-${pom.version}</webAppSourceDirectory>
          <contextPath>/</contextPath>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <!--dependency>
      <groupId>cn.itcast.mp</groupId>
      <artifactId>[the artifact id of the block to be mounted]</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>RELEASE</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-core</artifactId>
      <version>3.1.1</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
</project>

他们俩的maven父文件

<?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>

    <groupId>cn.itcast.mp</groupId>
    <artifactId>itcast-mybatis-plus</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>

        <module>mybatis-plus-simple</module>
        <module>mybatis-plus-spring</module>
    </modules>

    <dependencies>
        <!-- mybatis-plus插件依赖 -->
        <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>5.1.6</version>
        </dependency>
        <!-- 连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.11</version>
        </dependency>
        <!--简化bean代码的工具包-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
            <version>1.18.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.9.1</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>
    </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>

</project>

maven文件关系如下
在这里插入图片描述

举报

相关推荐

Mybatis-Plus入门 基础篇

intellij-ideamavenjavamysqlmybatis

【Mybatis-Plus】Mybatis-Plus快速入门

人工智能

mybatis-plus入门

mybatisplus软件研发

Mybatis-Plus入门

javaspring bootmysql

【MyBatis-Plus】MyBatis-Plus框架入门学习

mybatisspringUsermysqlJavaScript前端开发

【MyBatis-Plus】MyBatis-Plus基本操作快速入门

mybatismybatisplusmapper持久层spring编程语言

MyBatis-Plus【启程篇】

javaspring bootmysqlspring数据库系统/运维

mybatis-plus入门使用

kotlinjavamybatis-plusspring bootdatabase

Mybatis-Plus极速入门

MyBatisJava

Mybatis-Plus快速入门

postgresqljava数据库springUser虚拟化云计算
0 条评论