Mybatis(1) 创建Mybatis HelloWorld

简介：

MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以使用简单的 XML 或注解来配置和映射原生信息，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。　　　　　　——百度百科

创建maven工程:

项目结构：

pom.xml文件：

 <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.itdoc.mybatis</groupId>
   <artifactId>mybatis-01</artifactId>
   <version>1.0-SNAPSHOT</version>
   <packaging>jar</packaging>

   <name>mybatis-01</name>
   <url>http://maven.apache.org</url>

   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>

   <dependencies>
     <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
       <version>2.8.2</version>
     </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/junit/junit -->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
     </dependency>

   </dependencies>
 </project>

pom.xml

 全局配置文件(mybatis-config.xml)：此配置文件不是必须的。

 <?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>
     <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/mybatis" />
                 <property name="username" value="root" />
                 <property name="password" value="root" />
             </dataSource>
         </environment>
     </environments>
     <!-- 将写好的sql映射文件（EmployeeMapper.xml）一定要注册到全局配置文件(mybatis-config.xml)中 -->
     <mappers>
         <mapper resource="mapper/EmployeeMapper.xml" />
     </mappers>
 </configuration>

mybatis-config.xml

Mybatis中配置中相应的对应关系：

github源码：https://github.com/wcd19901010/Mybatis/tree/master/mybatis-01