一、准备环境(我的demo数据如下) 1、创建数据。
CREATE DATABASE my_db; CREATE TABLE user( id INT(11) PRIMARY KEY AUTO_INCREMENT, parentId INT(11), sonId INT(11), name VARCHAR(255), birthday DATE )DEFAULT CHARSET=utf8;2、加入 jar包 maven pom.xml :
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.2</version> </dependency> <dependency> <groupId>MySQL</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.40</version> </dependency> </dependencies>二、目录结构如下:
1、创建 User.java 对象
package com.zll.TestMyBatis.bean;import java.util.Date;public class User { private int id; private int parentId; private int sonId; private String name; private Date birthday; public int getId() { return id; } public void setId(int id) { this.id = id; } public int getParentId() { return parentId; } public void setParentId(int parentId) { this.parentId = parentId; } public int getSonId() { return sonId; } public void setSonId(int sonId) { this.sonId = sonId; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; }}2、创建 User.xml 映射文件。 注意: namespace=”hello” 和 insert id=”world” 这个hello 和 world 关键字后面会用到,这里你先跟着写。
<?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"> <!--会面会根据关键字 hello 和 world的来查找对象的方法--><mapper namespace="hello"> <!-- 增加 要使用 insert标签 --> <insert id="world" parameterType="com.zll.TestMyBatis.bean.User"> insert into user(parentId,sonId,name,birthday) value(#{parentId},#{sonId},#{name},#{birthday}) </insert></mapper>1、先创建 mybatis 配置文件:mybatis-config.xml 注意:数据库名称,账号,密码,参数要改成你自己的。
<?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/my_db?characterEncoding=UTF8"/> <property name="username" value="root"/> <property name="passWord" value="root"/> </dataSource> </environment> </environments> <mappers> <!-- 这里改成自己User.xml的路径 --> <mapper resource="com/zll/TestMyBatis/bean/User.xml"/> </mappers></configuration>4、使用junit 开始测试:
public class APPTest extends TestCase { public void insertUser() throws IOException { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlsessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); SqlSession session = sqlSessionFactory.openSession(); User user = new User(); user.setName("小明"); user.setBirthday(new Date()); //这里调用的就是 User.xml 映射的 namespace 和 id了,insert内部是根据这两个关键字来查找映射路径的,(当然起名字最好起的有意义) session.insert("hello.world", user); session.commit(); session.close(); }}一条简单的数据插入成功。
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