快速搭建mybatis,測試數據庫等功能

1.項目結構

1.0示意圖

1.1pom.xml文件依賴的jar包

<?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>com.atguigu.mybatis</groupId>
	<artifactId>MyBatis</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<name>MyBatis</name>
	<!-- FIXME change it to the project's website -->
	<url>http://www.example.com</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.1</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.38</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>



	</dependencies>

	<build>
		<pluginManagement><!-- lock down plugins versions to avoid using Maven 
				defaults (may be moved to parent pom) -->
			<plugins>
				<plugin>
					<artifactId>maven-clean-plugin</artifactId>
					<version>3.0.0</version>
				</plugin>
				<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
				<plugin>
					<artifactId>maven-resources-plugin</artifactId>
					<version>3.0.2</version>
				</plugin>
				<plugin>
					<artifactId>maven-compiler-plugin</artifactId>
					<version>3.7.0</version>
				</plugin>
				<plugin>
					<artifactId>maven-surefire-plugin</artifactId>
					<version>2.20.1</version>
				</plugin>
				<plugin>
					<artifactId>maven-jar-plugin</artifactId>
					<version>3.0.2</version>
				</plugin>
				<plugin>
					<artifactId>maven-install-plugin</artifactId>
					<version>2.5.2</version>
				</plugin>
				<plugin>
					<artifactId>maven-deploy-plugin</artifactId>
					<version>2.8.2</version>
				</plugin>
			</plugins>
		</pluginManagement>
	</build>
</project>

1.2實體類

public class Employee {
	private Integer id ;
	private String lastName;
	private String email;
	private String gender;
    //getter/setter方法
}

1.3 mapper接口

package com.atguigu.myabtis.mapper;

import com.atguigu.mybatis.bean.Employee;

public interface EmployeeMapper {
	public Employee selectEmployee(Integer id);
}

1.4 mapper映射文件EmployeeMapper.xml

<?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.atguigu.myabtis.mapper.EmployeeMapper">

	<select id="selectEmployee" resultType="com.atguigu.mybatis.bean.Employee">
		select id ,last_name lastName ,email ,gender from tbl_employee where id = #{id}
		<!-- select * from tbl_employee  where id = #{id} -->
	</select>
	
</mapper>

1.5 日誌配置文件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>

1.6 mybatis核心配置文件mybatis.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>
	
<!-- 數據庫連接環境的配置 -->
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/test_mybatis" />
				<property name="username" value="root" />
				<property name="password" value="root" />
			</dataSource>
		</environment>
	</environments>
	<!-- 引入SQL映射文件,Mapper映射文件 	-->
	<mappers>
		<mapper resource="EmployeeMapper.xml" />
	</mappers>


</configuration>

1.7 數據庫準備的數據

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,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8

1.8編寫測試類

public class TestEmp {
	@Test
	public void test() throws IOException {

		String resource = "mybatis.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory build = new SqlSessionFactoryBuilder().build(inputStream);
		System.out.println(build);
		SqlSession openSession = build.openSession();
		try {
			Employee employee = openSession.selectOne("com.atguigu.myabtis.mapper.EmployeeMapper.selectEmployee", 1);
			System.out.println(employee);
		} finally {
			openSession.close();
		}
	}

}

 

1.9測試結果

2.0 剩下的增刪改，可以修改一下相應的接口及sql，即可實現，就省略了。

注意：測試類 方法中，增刪改，還需要在try裏面最後加多一行代碼sqlSession.commit(); 提交 數據才能入庫！