02_集成MP
創(chuàng)建測試表
/*
Navicat MySQL Data Transfer
Source Server : tom
Source Server Version : 50525
Source Host : localhost:3306
Source Database : mp-test
Target Server Type : MYSQL
Target Server Version : 50525
File Encoding : 65001
Date: 2019-06-08 14:36:59
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for tbl_employee
-- ----------------------------
DROP TABLE IF EXISTS `tbl_employee`;
CREATE TABLE `tbl_employee` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`last_name` varchar(50) DEFAULT NULL,
`email` varchar(50) DEFAULT NULL,
`gender` char(1) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of tbl_employee
-- ----------------------------
INSERT INTO `tbl_employee` VALUES ('1', 'Tom', 'tom@tomxwd.top', '1', '22');
INSERT INTO `tbl_employee` VALUES ('2', 'Jerry', 'jerry@tomxwd.top', '0', '25');
INSERT INTO `tbl_employee` VALUES ('3', 'Black', 'black@tomxwd.top', '1', '30');
INSERT INTO `tbl_employee` VALUES ('4', 'White', 'white@tomxwd.top', '0', '35');
創(chuàng)建javaBean
public class Employee {
private Integer id;
private String lastName;
private String email;
private Integer gender;
private Integer age;
@Override
public String toString() {
return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", age="
+ 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;
}
}
需要注意的是砂沛，在定義javabean的時候仁烹，成員變量使用的類型：建議使用包裝類型，因?yàn)榛绢愋陀赡J(rèn)值。
- int ==> 0
- boolean ==> false
如果有默認(rèn)值双絮，那么就不會有null值出現(xiàn)。
依賴配置
- 在pom.xml文件中加入對MP邓尤、Spring畔况、連接池、Junit澄干、Mysql驅(qū)動等依賴逛揩。
<dependencies>
<!-- MP -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>2.3</version>
</dependency>
<!-- Junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
<!-- log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- c3p0連接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- spring相關(guān) -->
<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>
</dependencies>
可以發(fā)現(xiàn)沒有加入Mybatis以及Mybatis-Spring橋梁包的信息，因?yàn)镸ybatis-Plus插件會自動維護(hù)麸俘。
- 搭建Mybatis以及Spring相關(guān)的環(huán)境
首先創(chuàng)建mybatis-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>
由于要遷移到spring中辩稽，所以mybatis的配置文件這里是為空的。
- log4j.xml文件
<?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>
- db.properties文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mp-test
jdbc.username=root
jdbc.password=root
- spring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://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
http://mybatis.org/schema/mybatis-spring
http://mybatis.org/schema/mybatis-spring-1.2.xsd"
>
<!-- 數(shù)據(jù)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>
<!-- 事務(wù)管理器 -->
<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 基于注解的事務(wù)管理 -->
<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<!-- 配置SqlSessionFactoryBean -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 數(shù)據(jù)源 -->
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 別名處理 -->
<property name="typeAliasesPackage" value="top.tomxwd.mp.beans"></property>
</bean>
<!-- 配置mybatis 掃描mapper接口的路徑 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="top.tomxwd.mp.mapper"></property>
</bean>
</beans>
測試
public class TestMP {
private ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");
@Test
public void testDataSource() throws SQLException {
DataSource ds = ioc.getBean("dataSource",DataSource.class);
System.out.println(ds);
Connection conn = ds.getConnection();
System.out.println(conn);
}
}
測試是否能夠拿到DataSource疾掰，如果能夠get到Connection搂誉，則說明成功。
集成MP
Mybatis-Plus的集成非常簡單静檬，對于Spring炭懊，我們僅僅需要把Mybatis自帶的MybatisSqlSessionFactoryBean替換為MP自帶的即可。
<!-- 配置MybatisSqlSessionFactoryBean -->
<bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
<!-- 數(shù)據(jù)源 -->
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 別名處理 -->
<property name="typeAliasesPackage" value="top.tomxwd.mp.beans"></property>
</bean>
