Mybatis的简单使用步骤（java项目）

1、在eclipse中创建mavenjava项目（jar）,并初始化依赖,放入log4j的配置文件

pom文件如下（一个是Mybatis必须的，一个是log4j的日志）

<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.iflytek</groupId>
  <artifactId>Mybatis1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <dependencies>
		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.5</version>
		</dependency>
		
	
		<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
	</dependencies>
  
</project>

放入log4j的配置文件（log4j.properties）

# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.com.iflytek=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

2、创建mybatis-config.xml文件，指定最基本的environments和mappers，这里我用外部加载数据库配置文件jdbc.properties

jdbc.properties如下

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@172.16.130.35:1521:orcl
jdbc.username=uuid
jdbc.password=uuid

hibernate.dialect=org.hibernate.dialect.Oracle10gDialect
hibernate.hbm2ddl.auto=update
hibernate.show_sql=true
hibernate.format_sql=true

mybatis-config.xml如下

<?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>
	<properties resource="jdbc.properties" />

	<!-- 设置整个包下的文件都以自己的类名为别名 ，不然在之后的mapper.xml中要写类的全路径-->
	<typeAliases>
		<package name="com.iflytek.domain" />
	</typeAliases>

	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="${jdbc.driverClassName}" />
				<property name="url" value="${jdbc.url}" />
				<property name="username" value="${jdbc.username}" />
				<property name="password" value="${jdbc.password}" />

			</dataSource>
		</environment>
	</environments>
	<!-- 将映射的文件指定到类中而不是资源文件中，可用resource 或者class指定到资源文件中 -->
	<mappers>
		<package name="com.iflytek.dao"/>
	</mappers>
</configuration>

3、创建对应的pojo, mapper.xml文件和对应在dao中的接口，这里用Blog.java, BlogMapper.xml和BlogMapper.java三个文件

Blog.java

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package com.iflytek.domain;

public class Blog {
	private int id;
	private String title;
	private String auth;

	public int getId() {
		return id;
	}

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

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getAuth() {
		return auth;
	}

	public void setAuth(String auth) {
		this.auth = auth;
	}

	@Override
	public String toString() {
		return "Blog [id=" + id + ", title=" + title + ", auth=" + auth + "]";
	}

}

BlogMapper.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.iflytek.dao.BlogMapper">

	<!-- 当数据库的字段与pojo的字段不匹配时，要指定resultMap,下面指定resultMap 而不是resultType column为数据库的，property为pojo的 -->
	<resultMap type="Blog" id="bid">
		<id column="id" property="id" />
		<result column="title1" property="title" />
		<result column="auth1" property="auth" />
	</resultMap>

	<!--select,insert,update,delete四个标签定义sql语句，每一个标签对应一条接口中的抽象方法  -->
	<select id="selectBlog" resultMap="bid">
		select *
		from tt_blog where id = #{id}
	</select>

	<insert id="saveBlog" parameterType="Blog">
		insert into tt_blog (id,title) values(SEQ_BLOG.nextval,#{title})
	</insert>

	<update id="updateBlog" parameterType="Blog">
		update tt_blog set title = #{title}
		<!-- 动态sql，当想更新的内容不为空的时候，则会执行，否则将不会执行 -->
		<if test="auth != null">
			,auth = #{auth}
		</if>
		where id = #{id}
	</update>

	<delete id="deleteBlog">
		delete from tt_blog where id = #{id}
	</delete>
</mapper>

BlogMapper.java

package com.iflytek.dao;

import com.iflytek.domain.Blog;

public interface BlogMapper {
	public Blog selectBlog(Blog blog);
	public void saveBlog(Blog blog);
	public void updateBlog(Blog blog);
	public void deleteBlog(Blog blog);
	
}

4、代建对应的数据库和表，本例创建如下

初始化部分数据

5、创建测试类进行测试，这里对SQLsessionfactory还没有进行封装，开发中一般使用单例模式进行封装，只有一个工厂sessionfactory，可有多个session对象（Test.java）

package com.iflytek.test;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.iflytek.dao.BlogMapper;
import com.iflytek.domain.Blog;

public class Test {
	public static void main(String[] args) throws IOException {
		
		String resource = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		
		SqlSession session = sqlSessionFactory.openSession();
		try {
			
			BlogMapper mapper = session.getMapper(BlogMapper.class);
			
			Blog blog = new Blog();
			blog.setId(1);
			
			Blog res = mapper.selectBlog(blog);
			
			System.out.println(res.getTitle());
		} finally {
		  session.close();
		}
	}
}

6、查看结果（id为1的对应title为1111），正确

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Mybatis的简单使用步骤（java项目）

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