Mybatis-Plus 实战完整学习笔记(二)------环境搭建

 第二章    使用实例

 

1.搭建测试数据库

 -- 创建库
 CREATE DATABASE mp;
 -- 使用库
 USE mp;
 -- 创建表
 CREATE TABLE tbl_employee(
 id INT(11) PRIMARY KEY AUTO_INCREMENT, last_name VARCHAR(50),
 email VARCHAR(50),
 gender CHAR(1),
 age int );
 INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Tom','tom@atguigu.com',1,22); INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Jerry','jerry@atguigu.com',0,25); INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Black','black@atguigu.com',1,30); INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('White','white@atguigu.com',0,35);

2.搭建成功后

3. 项目搭建

建立一个maven项目

设置包名和项目名称

确认成功

新建包名

4.实体类创建

这里是标准的写法，根据阿里云Java手册规范写的，如果你需要可以下载其插件 网址：https://github.com/alibaba/p3c

源码：

 package com.baidu.www.mplus;

 /**
  *
  * @author liuyangos8888
  *
  * 实体类
  *
  */
 public class Employee {

     /**
      * 字段的ID
      */
     private Integer id ;

     /**
      * 名字
      */
     private String lastName;

     /**
      * 邮箱
      */
     private String email ;

     /**
      * 性别
      */
     private Integer gender ;

     /**
      * 年龄
      */
     private Integer age ;

     public Integer getId() {
         return id;
     }

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

     public String getLastName() {
         return lastName;
     }

     public void setLastName(String lastName) {
         this.lastName = lastName;
     }

     public String getEmail() {
         return email;
     }

     public void setEmail(String email) {
         this.email = email;
     }

     public Integer getGender() {
         return gender;
     }

     public void setGender(Integer gender) {
         this.gender = gender;
     }

     public Integer getAge() {
         return age;
     }

     public void setAge(Integer age) {
         this.age = age;
     }
 }

5.SSM基础环境配置搭建

（1）全局mybaits-config.xml

 <?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">
 <configuration>

 </configuration>

(2)log4j.xml日志配置，标红没问题

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
     <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
         <param name="Encoding" value="UTF-8"/>
         <layout class="org.apache.log4j.PatternLayout">
             <param name="ConversionPattern" value="%-5p
 %d{HH:mm :ss,SSS} %m (%F:%L) \n"/>
         </layout>
     </appender>
     <logger name="java.sql">
         <level value="debug"/>
     </logger>
     <logger name="org.apache.ibatis">
         <level value="info"/>
     </logger>
     <root>
         <level value="debug"/>
         <appender-ref ref="STDOUT"/>
     </root>
 </log4j:configuration>

（3）数据库配置db.properties

 jdbc.driver=com.mysql.jdbc.Driver
 jdbc.url=jdbc:mysql://localhost:3306/mp
 jdbc.username=root
 jdbc.password=123456

(4) applicationContext.xml组合配置

 <?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"
        xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
        xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring
     http://mybatis.org/schema/mybatis-spring-1.2.xsd
     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-4.0.xsd
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
     <!-- 数据源 -->
     <context:property-placeholder location="classpath:db.properties"/>

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

     <!-- 事务管理器 -->
     <bean id="dataSourceTransactionManager"
           class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <property name="dataSource" ref="dataSource"></property>
     </bean>

     <!-- 基于注解的事务管理 -->
     <tx:annotation-driven
             transaction-manager="dataSourceTransactionManager"/>

     <!-- 配置 SqlSessionFactoryBean -->
     <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactoryBean">

         <!-- 数据源 -->
         <property name="dataSource" ref="dataSource"></property>

         <property name="configLocation" value="classpath:mybatis-config.xml">

         </property>

         <!-- 别名处理 -->
         <property name="typeAliasesPackage" value="com.baidu.www.mplus.bean">
         </property>
     </bean>

     <!--配置 mybatis 扫描 mapper 接口的路径 -->
     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage"
                   value="com.baidu.www.mplus.mapper">

         </property>
     </bean>
 </beans>

（5）目录结构

6.测试类编写

 import org.junit.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 import javax.sql.DataSource;
 import java.sql.Connection;
 import java.sql.SQLException;

 /**
  * test
  */
 public class TestMp {
     private ApplicationContext iocContext = new ClassPathXmlApplicationContext("applicationContext.xml");

     @Test
     public void context() throws SQLException {

         DataSource ds = iocContext.getBean("dataSource", DataSource.class);
         Connection conn = ds.getConnection();
         System.out.println(conn);

     }
 }

7.Mybatisplus替代SqlSessionFactory，修改 applicationContext.xml组合配置

 <?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"
        xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
        xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring
     http://mybatis.org/schema/mybatis-spring-1.2.xsd
     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-4.0.xsd
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
     <!-- 数据源 -->
     <context:property-placeholder location="classpath:db.properties"/>

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

     <!-- 事务管理器 -->
     <bean id="dataSourceTransactionManager"
           class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <property name="dataSource" ref="dataSource"></property>
     </bean>

     <!-- 基于注解的事务管理 -->
     <tx:annotation-driven
             transaction-manager="dataSourceTransactionManager"/>

     <!-- 配置 SqlSessionFactoryBean -->
     <!--<bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactoryBean">-->

         <!--&lt;!&ndash; 数据源 &ndash;&gt;-->
         <!--<property name="dataSource" ref="dataSource"></property>-->

         <!--<property name="configLocation" value="classpath:mybatis-config.xml">-->

         <!--</property>-->

         <!--&lt;!&ndash; 别名处理 &ndash;&gt;-->
         <!--<property name="typeAliasesPackage" value="com.baidu.www.mplus.bean">-->
         <!--</property>-->
     <!--</bean>-->

     <!--&lt;!&ndash;修改为MybatisPlus配置&ndash;&gt;-->
     <bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">

         <!-- 数据源 -->
         <property name="dataSource" ref="dataSource"></property>

         <property name="configLocation" value="classpath:mybatis-config.xml">

         </property>

         <!-- 别名处理 -->
         <property name="typeAliasesPackage" value="com.baidu.www.mplus.bean">
         </property>
     </bean>

     <!--配置 mybatis 扫描 mapper 接口的路径 -->
     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage"
                   value="com.baidu.www.mplus.mapper">

         </property>
     </bean>
 </beans>

8.再次测试。无误初步MybaitsPlus的SSM环境配置成功。