Mybatis接口编程方式实现增删改查
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转载自Mybatis接口编程方式实现增删改查
Mybatis接口编程方式实现增删改查
前面一章【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 ，已经搭建好了eclipse,mybatis,MySQL的环境，并且实现了一个简单的查询。请注意，这种方式是用SqlSession实例来直接执行已映射的SQL语句：
session.selectOne("com.mucfc.model.EmployeerMapper.findEmployeerByID", 1);其实还有更简单的方法，而且是更好的方法，使用合理描述参数和SQL语句返回值的接口（比如EmployeerMapper.Java），这样现在就可以至此那个更简单，更安全的代码，没有容易发生的字符串文字和转换的错误.下面是详细过程:
本文要改成以接口类来实现增删改查
整个工程目录 ：
本文示例工程免费下载
1.首先还是mybatis的配置文件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"> <!-- 这是根标签 --> <configuration> <!-- 元素允许在主配置文件之外提供一个properties格式对应文件，从而使得主配置文件更加通用。这样对部署非常有用 --> <properties resource="mysql.properties" /> <!-- 设置别名，一定要放在properties下面 --> <typeAliases> <typeAlias alias="Employeer" type="com.mucfc.model.Employeer" /> </typeAliases> <!-- 配置数据源相关的信息 --> <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?characterEncoding=UTF-8"/> <property name="username" value="root"/> <property name="password" value="christmas258@"/> --> <property name="driver" value="${driver}" /> <property name="url" value="${url}" /> <property name="username" value="${username}" /> <property name="password" value="${password}" /> </dataSource> </environment> </environments> <!-- 列出映射文件 --> <mappers> <mapper resource="com/mucfc/model/Employeer.xml" /> </mappers> </configuration> 其中配置文件mysql.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/test?charset=utf8 username=root password=christmas258@ 2.数据表对应的类Employeer.java
package com.mucfc.model; import java.io.Serializable; /** * 雇员信息类 *@author linbingwen *@time 2015.5.11 */ public class Employeer { private Integer employeer_id; private String employeer_name; private Integer employeer_age ; private String employeer_department; private String employeer_worktype; public Employeer() { super(); } public Integer getEmployeer_id() { return employeer_id; } public void setEmployeer_id(Integer employeer_id) { this.employeer_id = employeer_id; } public String getEmployeer_name() { return employeer_name; } public void setEmployeer_name(String employeer_name) { this.employeer_name = employeer_name; } public Integer getEmployeer_age() { return employeer_age; } public void setEmployeer_age(Integer employeer_age) { this.employeer_age = employeer_age; } public String getEmployeer_department() { return employeer_department; } public void setEmployeer_department(String employeer_department) { this.employeer_department = employeer_department; } public String getEmployeer_worktype() { return employeer_worktype; } public void setEmployeer_worktype(String employeer_worktype) { this.employeer_worktype = employeer_worktype; } @Override public String toString() { return "Employeer [employeer_id=" + employeer_id + ", employeer_name=" + employeer_name + ", employeer_age=" + employeer_age + ", employeer_department=" + employeer_department + ", employeer_worktype=" + employeer_worktype + "]"; } } 然后是SQL语句的配置Employeer.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.mucfc.mapper.EmployeerMapper"> <!-- 查找 --> <select id="findEmployeerByID" parameterType="int" resultType="Employeer"> select* from `t_employeer` where employeer_id =#{employeer_id} </select> <!-- 插入 --> <!-- useGeneratedKeys设置为"true"表明要MyBatis获取由数据库自动生成的主键；keyProperty="id"指定把获取到的主键值注入到Employeer的id属性 --> <insert id="addEmployeer" parameterType="Employeer" useGeneratedKeys="true" keyProperty="employeer_id"> insert into `t_employeer`(employeer_name,employeer_age,employeer_department,employeer_worktype) values(#{employeer_name},#{employeer_age},#{employeer_department},#{employeer_worktype}) </insert> <!-- 删除 --> <delete id="deleteEmployeer" parameterType="int"> delete from `t_employeer` where employeer_id = #{employeer_id} </delete> <!-- 修改 --> <update id="updateEmployeer" parameterType="Employeer"> update t_employeer set employeer_name = #{employeer_name},employeer_age= #{employeer_age},employeer_department = #{employeer_department} ,employeer_worktype=#{employeer_worktype} where employeer_id = #{employeer_id} </update> </mapper> 注意com.mucfc.mapper.EmployeerMapper这个类是存在的，它是一个接口类，上一讲我们是使用com.mucfc.model.EmployeerMapper，而上一讲的这个类是不存在的
4.SQL语句映射类EmployeerMapper.java
package com.mucfc.mapper; import com.mucfc.model.Employeer; /** * SQL语句映射类 * @author linbingwen * @time 2015.5.11 */ public interface EmployeerMapper { /** * 注意要和Employeer.xml的方法名对应 */ public Employeer findEmployeerByID(int id); /** * 注意要和Employeer.xml的方法名对应 */ public void addEmployeer(Employeer employeer); /** * 注意要和Employeer.xml的方法名对应 */ public void deleteEmployeer(int id); /** * 注意要和Employeer.xml的方法名对应 */ public void updateEmployeer(Employeer employeer); } 5.测试：
（1）增加命令
上一讲【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 中的方式：
/** * 增加 */ public static void addEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); //返回值是记录条数 int resultCount = session.insert("com.mucfc.model.EmployeerMapper.addEmployeer", employeer ); System.out.printf("当前插入的employeer_id :%d 当前插入数据库中条数:%d " , employeer.getEmployeer_id() ,resultCount); //获取插入对象的id System.out.println(""); session.commit() ; } finally { session.close(); } } 改成以接口编程的方式：
/** * 增加 */ public static void addEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.addEmployeer(employeer); session.commit() ; } finally { session.close(); } } （2）删除命令
上一讲【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 中的方式：
/** * 删除 * */ public static void deleteEmployeer(int id){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); //返回值是记录条数 int resultCount=session.delete("com.mucfc.model.EmployeerMapper.deleteEmployeer",id); System.out.println("当前删除数据库中条数: "+resultCount); //获取插入对象的id session.commit() ; } finally { session.close(); } } 改成以接口编程的方式：
/** * 删除 * */ public static void deleteEmployeer(int id){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.deleteEmployeer(id); session.commit() ; } finally { session.close(); } } （3）查找命令
上一讲【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 中的方式：
/** * 查找 */ public static void findEmployeerById(int id) { SqlSession session = null; try { session = sqlSessionFactory.openSession(); Employeer employeer = (Employeer) session.selectOne( "com.mucfc.model.EmployeerMapper.findEmployeerByID", 1); if (employeer == null) System.out.println("null"); else System.out.println(employeer); } finally { session.close(); } } 改成以接口编程的方式：
/** * 查找 */ public static void findEmployeerById(int id) { SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); Employeer employeer=employeerMapper.findEmployeerByID(id); if (employeer == null) System.out.println("null"); else System.out.println(employeer); } finally { session.close(); } } （4）修改命令
上一讲【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 中的方式：
/** * 更改 */ public static void updateEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); session.update("com.mucfc.model.EmployeerMapper.updateEmployeer",employeer); session.commit() ; } finally { session.close(); } } 改成以接口编程的方式：
/** * 更改 */ public static void updateEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.updateEmployeer(employeer); session.commit() ; } finally { session.close(); } } 这是一个完整的测试：
package com.mucfc.test; import java.io.IOException; import java.io.Reader; 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.mucfc.mapper.EmployeerMapper; import com.mucfc.model.Employeer; public class MybatisTest { private static SqlSessionFactory sqlSessionFactory; private static Reader reader; static { try { reader = Resources.getResourceAsReader("mybatis-config.xml"); sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); } catch (Exception e) { e.printStackTrace(); } } /** * 查找 */ public static void findEmployeerById(int id) { SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); Employeer employeer=employeerMapper.findEmployeerByID(id); if (employeer == null) System.out.println("null"); else System.out.println(employeer); } finally { session.close(); } } /** * 增加 */ public static void addEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.addEmployeer(employeer); session.commit() ; } finally { session.close(); } } /** * 删除 * */ public static void deleteEmployeer(int id){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.deleteEmployeer(id); session.commit() ; } finally { session.close(); } } /** * 更改 */ public static void updateEmployeer(Employeer employeer){ SqlSession session = null; try { session = sqlSessionFactory.openSession(); EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class); employeerMapper.updateEmployeer(employeer); session.commit() ; } finally { session.close(); } } public static void main(String[] args) { Employeer employeer1=new Employeer(); employeer1.setEmployeer_name("李四"); employeer1.setEmployeer_age(23); employeer1.setEmployeer_department("产品一部"); employeer1.setEmployeer_worktype("开发工程师"); Employeer employeer2=new Employeer(); employeer2.setEmployeer_name("张三"); employeer2.setEmployeer_age(30); employeer2.setEmployeer_department("产品二部"); employeer2.setEmployeer_worktype("测试工程师"); Employeer employeer3=new Employeer(); employeer3.setEmployeer_name("小王"); employeer3.setEmployeer_age(22); employeer3.setEmployeer_department("产品三部"); employeer3.setEmployeer_worktype("数据分析师"); Employeer employeer4=new Employeer(); employeer4.setEmployeer_name("明明"); employeer4.setEmployeer_age(22); employeer4.setEmployeer_department("财会部"); employeer4.setEmployeer_worktype("财务人员"); //插入 addEmployeer(employeer1); addEmployeer(employeer2); addEmployeer(employeer3); addEmployeer(employeer4); findEmployeerById(26); deleteEmployeer(27); //更改 employeer2.setEmployeer_id(28); employeer2.setEmployeer_age(21); employeer2.setEmployeer_department("产品四部"); updateEmployeer(employeer2); } } 测试结果：
插入了4条数据，ID为25~28
然后27号被删除
29号被修改
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