config.xml的配置
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<?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> <!-- 拿到数据库信息,这是db.properties的内容 driver=com.MySQL.jdbc.Driver url=jdbc:mysql: //localhost:3306/usertest username=root password=root --!> <properties resource= "db.properties" > </properties> <!-- 别名优化--!> <typeAliases> <!-- < package name= "com.leige.entity" /> --> <typeAlias type= "com.leige.entity.User" alias= "user" /> </typeAliases> <!--设置框架工作模式development开发者模式 ,work是工作模式 --> <environments default = "development" > <environment id= "development" > <transactionManager type= "jdbc" ></transactionManager> <!-- 配置数据源 --> <dataSource type= "POOLED" > <!-- 注册驱动 --> <property name= "driver" value= "${driver}" /> <!-- 连接数据库 --> <property name= "url" value= "${url}" /> <!-- 密码帐号登录 --> <property name= "username" value= "${username}" /> <property name= "password" value= "${password}" /> </dataSource> </environment> </environments> <!-- 使用xml,mapper resource需要设置--!> <!-- <mappers> <mapper resource= "com/leige/entity/UserMappen.xml" ></mapper> </mappers> --> <!--使用注解,mapper配置 class ,查询方法写在接口中--!> <mappers> <mapper class = "com.leige.impl.UserImpl" /> </mappers> |
使用xml需要再配置一个mappen.xml
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<?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" > <!-- 建立表与类的映射关系有两种:一个是xml(倾向),另一个是注解 --> <mapper namespace= "com.leige.entity.UserMappen" > <!-- 查询全部 --> <select id= "selectAll" resultType= "user" > select * from user </select> <!-- 增加用户 --> <update id= "insertUser" parameterType= "user" > insert into user values ( null ,#{name},#{password},#{age}) </update> </mapper> 使用注解则用接口 public interface UserImpl { //更新用户,更新用@update,查询用@select,插入用@insert,删除使用@delete这些注解 @Update ( "update user set name=#{name} where id=#{id}" ) public void updateUser(User user); } demo测试代码 public class Demo { static InputStream in = null ; static SqlSessionFactory ssf = null ; static { in = Demo. class .getClassLoader().getResourceAsStream( "config.xml" ); ssf = new SqlSessionFactoryBuilder().build(in); } public static void main(String[] args) { //selectAll(); //insertUser(); updateUser(); } //查询全部 public static void selectAll(){ SqlSession session = ssf.openSession(); List<User> list = session.selectList( "com.leige.entity.UserMappen.selectAll" ); System.out.println(list); session.close(); } //增加用户 public static void insertUser(){ SqlSession session = ssf.openSession(); User user = new User(); user.setName( "小霸王" ); user.setPassword( "aaaaa" ); user.setAge( 25 ); int num = session.insert( "com.leige.entity.UserMappen.insertUser" ,user); session.commit(); System.out.println(num); session.close(); } //修改用户信息 public static void updateUser(){ SqlSession session = ssf.openSession(); UserImpl userImpl = session.getMapper(UserImpl. class ); User user = new User(); user.setName( "我是大头鬼" ); user.setPassword( "aaaaa" ); user.setAge( 25 ); user.setId( 79 ); userImpl.updateUser(user); session.commit(); session.close(); } } </configuration> |
以上所述是小编给大家介绍的Mybatis开发环境搭建实现数据的增删改查功能,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://blog.csdn.net/leigelg/article/details/59638687