MyBatis Plus (二) --------- 集成 MP

素颜马尾好姑娘i 2024-04-07 11:38 21阅读 0赞

#### 目录 ####

*  一、创建测试表
 *  二、创建 JavaBean
 *  三、依赖配置
 *  四、测试
 *  五、集成 MP

--------------------

## 一、创建测试表 ##

-- 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@fancy.com',1,22);
    INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Jerry','jerry@fancy.com',0,25);
    INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('Black','black@fancy.com',1,30);
    INSERT INTO tbl_employee(last_name,email,gender,age) VALUES('White','white@fancy.com',0,35);

## 二、创建 JavaBean ##

public class Employee {
        
    	
    	private Integer id;
    	private String lastName;
    	private String email;
    	private Integer gender;
    	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;
    	}
    	
    	@Override
    	public String toString() {
        
    		return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email
    		+ ", gender=" + gender + ", age=" + age + "]";
    	}
    }

## 三、依赖配置 ##

在 pom.xml 中加入对 MP、Spring、连接池、Junit、Mysql 驱动等依赖

<dependency>
    	<groupId>com.baomidou</groupId>
    	<artifactId>mybatis-plus</artifactId>
    	<version>2.3</version>
    </dependency>
    
    
    <dependency>
    	<groupId>junit</groupId>
    	<artifactId>junit</artifactId>
    	<version>4.9</version>
    </dependency>
    
    
    <dependency>
    	<groupId>log4j</groupId>
    	<artifactId>log4j</artifactId>
    	<version>1.2.17</version>
    </dependency>
    
    
    <dependency>
    	<groupId>com.mchange</groupId>
    	<artifactId>c3p0</artifactId>
    	<version>0.9.5.2</version>
    </dependency>
    
    
    <dependency>
    	<groupId>mysql</groupId>
    	<artifactId>mysql-connector-java</artifactId>
    	<version>5.1.37</version>
    </dependency>
    
    
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-context</artifactId>
    	<version>4.3.10.RELEASE</version>
    </dependency>
    
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-orm</artifactId>
    	<version>4.3.10.RELEASE</version>
    </dependency>

特别说明: Mybatis 及 Mybatis-Spring 依赖请勿加入项目配置，以免引起版本冲突。Mybatis-Plus 会自动帮你维护

加入 MyBatis 的全局配置文件

<?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>

加入 log4j.xml

<?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{MM-dd 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>

加入 db.properties 连接信息配置

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/mp
    jdbc.username=root
    jdbc.password=1234

加入 spring 的配置文件 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"
    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">
    
    	
    	<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>
    	
    	
    	<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    
    	
    	<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
    	
    	
    	<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    		
    		<property name="dataSource" ref="dataSource"></property>
    		<property name="configLocation"
    		value="classpath:mybatis-config.xml"></property>
    		
    		<property name="typeAliasesPackage" value="com.fancy.mp.beans"></property>
    	</bean>
    	
    	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    		<property name="basePackage" value="com.fancy.mp.mapper"></property>
    	</bean>
    </beans>

## 四、测试 ##

测试 Spring-Mybatis 的环境，保证 OK。

private ApplicationContext iocContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    
    @Test
    public void testEnvironment() throws Exception{
        
    	DataSource ds = iocContext.getBean("dataSource",DataSource.class);
    	Connection conn = ds.getConnection();
    	System.out.println(conn);
    }

## 五、集成 MP ##

Mybatis-Plus 的集成非常简单，对于 Spring，我们仅仅需要把 Mybatis 自带的  
MybatisSqlSessionFactoryBean 替换为 MP 自带的即可。