Mybatis开发环境搭建实现数据的增删改查功能

<?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>

<?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>