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mybatis：3.2.8
数据库：mysql
项目结构
jar包准备：
mybatis-3.2.8.jar
mysql-connector-java-5.1.39-bin.jar
配置文件
1、jdbc.properties配置文件：
jdbc.driverClassName = com.mysql.jdbc.Driver jdbc.url = jdbc:mysql://127.1.0.1:3306/db_mybatis jdbc.username=root jdbc.password=root
2、mybatis主要配置文件，mybatis-config.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> <properties resource="jdbc.properties"></properties> <typeAliases> <typeAlias type="com.cz.model.Student" alias="Student"/> <!-- 类型别名 --> </typeAliases> <environments default="development"> <!-- 默认开发环境 --> <environment id="development"> <transactionManager type="JDBC"></transactionManager> <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> <mappers> <mapper resource="com/cz/mappers/StudentMapper.xml"/> </mappers> </configuration>
创建SqlSessionFactoryUtil工具类：
该工具类主要是加载mybatis配置文件并通过相应的builder生成session工厂，再从工厂产生sql session对象，这里使用到了单例设计模式（懒汉式）：
package com.cz.utill; 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; public class SqlSessionFactoryUtil { private static SqlSessionFactory sqlSessionFactory; private SqlSessionFactoryUtil() {} private static SqlSessionFactory getSqlSessionFactory() { if (sqlSessionFactory == null) { // 读取mybatis配置 InputStream inputStream = null; try { inputStream = Resources.getResourceAsStream("mybatis-config.xml"); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } catch (IOException e) { e.printStackTrace(); } } return sqlSessionFactory; } public static SqlSession openSession(){ return getSqlSessionFactory().openSession(); } }
创建实体映射类：
实体类Student.java，这里只有三个属性：
package com.cz.model; public class Student { private Integer id; private String name; private int age; public Student(String name, int age) { super(); this.name = name; this.age = age; } public Student() { super(); } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
编写Dao接口:
mybatis支持传统的类似hibernate的Dao层封装数据库操作，也支持面向mapper.xml配置文件的动态sql类型，如果使用传统的Dao数据库编程模型的话，需要在相应的Dao类中注入sql session工厂对象（一般通过构造注入），这里使用后一种方式即mapper配置：
package com.cz.mappers; import com.cz.model.Student; public interface StudentDao { /** * 新增 * @param student * @return */ public int add(Student student); }
mapper.xml配置文件：
<?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.cz.mappers.StudentDao"> <!-- 插入 --> <insert id="add" parameterType="Student"> insert into t_student values(null,#{name},#{age}) </insert> </mapper>
dao接口跟mapper文件的对应关系如下：
其中namespace只是为了简化parameterType的类型定义，如果未定义namespace的话，这里必须填写完整类名。
编写测试类StudentServiceTest.java：
package com.cz.service; import org.apache.ibatis.session.SqlSession; import com.cz.mappers.StudentDao; import com.cz.model.Student; import com.cz.utill.SqlSessionFactoryUtil; public class StudentServiceTest { public static void main(String[] args) { SqlSession sqlSession = SqlSessionFactoryUtil.openSession(); StudentDao studentDao = sqlSession.getMapper(StudentDao.class); //返回student dao接口 int result = studentDao.add(new Student("张三", 20)); sqlSession.commit(); if (result > 0) { System.out.println("添加成功"); } } }
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原文地址：http://www.cnblogs.com/caiya928/p/5629216.html
