【Mybatis】不启动项目直接测试Mapper的方法
- 0、前言
- 1. 依赖
- 2. 数据库
- 3. 实体类
- 4. Mapper文件
- 5. 配置类
- 6. Main方法
0、前言
在项目开发过程中，有时候一个庞大的SpringBoot 项目的启动时间可能要几分钟的时间，这时候我们如果想测试自己写的某个mybatis的Mapper的方法，要浪费大量时间在等待项目启动上。
本文通过一个Main方法和一个Mybatis配置类实现无需启动项目直接测试Mapper功能。
本文的工程目录结构如下：
1. 依赖
由于现在很多项目都是直接用mybatis-plus，所以本文依赖也是直接选用了mybatis-plus。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.3.2</version>
<dependency>
2. 数据库
数据库建表语句：
CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`score` int(11) NOT NULL,
`age` int(5) NOT NULL,
`gender` int(4) NOT NULL,
`oms_order_no` varchar(255) NOT NULL COMMENT 'oms单号',
`warehouse_code` varchar(64) NOT NULL COMMENT '仓库编码',
PRIMARY KEY (`id`),
UNIQUE KEY `idx_unique_oms_order_warehouse_code` (`oms_order_no`,`warehouse_code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
数据库中数据：
3. 实体类
package com.whut.mybatis.domain;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "student")
public class Student {
/**
* id
*/
@TableId(value = "id",type = IdType.AUTO)
private Integer id;
/**
* 名字
*/
@TableField("name")
private String name;
/**
* 分数
*/
@TableField("score")
private Integer score;
/**
* 年龄
*/
@TableField("age")
private Integer age;
/**
* 性别
*/
@TableField("gender")
private Integer gender;
/**
* oms单号
*/
@TableField("oms_order_no")
private String omsOrderNo;
/**
* 仓库号
*/
@TableField("warehouse_code")
private String warehouseCode;
}
4. Mapper文件
mapper接口：
public interface StudentMapper extends BaseMapper<Student> {
@Select("select age from student")
List<Integer> getAllage();
Student findByName(@Param("name") String name);
}
对应的xml文件
<?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="com.whut.mybatis.mapper.StudentMapper">
<select id="findByName" resultType="com.whut.mybatis.domain.Student">
select * from student where name=#{name} limit 1
</select>
</mapper>
5. 配置类
package com.whut.mybatis.config;
import com.baomidou.mybatisplus.core.MybatisConfiguration;
import org.apache.ibatis.logging.stdout.StdOutImpl;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.whut.mybatis.mapper")
public class TestMybatisConfig {
@Bean(name = "testDataSource")
public DataSource dbDataSource() {
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
driverManagerDataSource.setDriverClassName("com.mysql.jdbc.Driver");
driverManagerDataSource.setPassword("whut123456");
driverManagerDataSource.setUsername("root");
driverManagerDataSource.setUrl("jdbc:mysql://123.60.223.167:3306/mybatis?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC");
return driverManagerDataSource;
}
@Bean(name = "testSqlSessionFactory")
public SqlSessionFactory dbSqlSessionFactory(@Qualifier("testDataSource") DataSource dataSource,
@Value("classpath*:mapper/*Mapper.xml") Resource[] mapperLocations) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(mapperLocations);
//https://blog.csdn.net/weixin_41785851/article/details/119739897
MybatisConfiguration configuration = new MybatisConfiguration();
configuration.setMapUnderscoreToCamelCase(true);
// 配置打印sql语句
configuration.setLogImpl(StdOutImpl.class);
bean.setConfiguration(configuration);
return bean.getObject();
}
@Bean(name = "testTransactionManager")
public DataSourceTransactionManager dbTransactionManager(@Qualifier("testDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
}
6. Main方法
这个Main方法的原理是是使用了一种注解方式的SpringBoot容器AnnotationConfigApplicationContext，这个容器里面只存放了配置BeanTestMybatisConfig，因此容器的启动速度非常快。
package com.whut.mybatis;
import com.whut.mybatis.config.TestMybatisConfig;
import com.whut.mybatis.domain.Student;
import com.whut.mybatis.mapper.StudentMapper;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args ) {
AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(TestMybatisConfig.class);
Student student = ac.getBean(StudentMapper.class).findByName("111");
System.out.println(student);
}
}
启动后控制台打印如下：
JDBC Connection [com.mysql.jdbc.JDBC4Connection@33f676f6] will not be managed by Spring
==> Preparing: select * from student where name=? limit 1
==> Parameters: 111(String)
<== Columns: id, name, score, age, gender, oms_order_no, warehouse_code
<== Row: 3, 111, 100, 25, 1, 5416161, 4841851515
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6e535154]
Student(id=3, name=111, score=100, age=25, gender=1, omsOrderNo=5416161, warehouseCode=4841851515)
综上所述，本文通过一个Main方法和一个Mybatis配置类实现无需启动项目直接测试Mapper功能。虽然我们没有启动项目，但是实际上还是启动了一个SpringBoot容器，只是这个容器内的Bean非常少，所以启动速度非常快。当然这个容器也是必须要有的，不然Mybatis也无法正常工作。
