配置文件SqlMapConfig.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>
<!-- 和spring整合后 environments配置将废除 -->
<!-- 环境配置 -->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/users?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="12345678" />
</dataSource>
</environment>
</environments>
<!-- 引入外部的xml映射文件 -->
<mappers>
<mapper resource="Bean/User.xml"/>
</mappers>
</configuration>
--------------------外部的配置文件---------------------
<?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">
<!-- 写Sql语句 -->
<mapper namespace="aa">
<!-- 通过id查询一个用户 -->
<select id="selectUserById" parameterType="Integer" resultType="Bean.User">
select * from user where id=#{id}
</select>
</mapper>
-------------------------测试代码---------------------------
public class oo {
@Test
public void testselect() throws IOException{
String resource="SqlMapConfig.xml";
//加载核心配置文件
InputStream in = Resources.getResourceAsStream(resource);
//创建sqlsessionFactory工厂
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建session
SqlSession Session = build.openSession();
//找到这个命名空间的这个select方法
User user = (User)Session.selectOne("aa.selectUserById",1);
System.out.println(user);
}
}
==========================================
模糊查询
<!-- 模糊查询
#{} 相当于? 占位符 == '网'
${} 字符串拼接 里面只能用value 拼接没有引号
-->
<select id="selectUserByName" parameterType="String" resultType="Bean.User">
select * from user where uname like '%${value}%'
</select>
<select id="selectUserByName" parameterType="String" resultType="Bean.User">
select * from user where uname like "%"#{c}"%"
</select>
</mapper>
@Test
public void testLink() throws IOException {
//加载核心配置文件
String resource="SqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
//创建sessionfactory工厂
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建sqlsesion
SqlSession session = build.openSession();
List<User> users = session.selectList("aa.selectUserByName","三");
System.out.println(users);
}
=====================================
添加用户
<!-- 添加用户 -->
<insert id="addUser" parameterType="Bean.User">
insert into user (uname,pwd) values (#{uname},#{pwd})
</insert>
@Test
public void testadd() throws IOException {
//加载核心配置文件
String resource="SqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
//创建sqlsessionFactory
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建sqlsession
SqlSession Session = build.openSession();
User user=new User();
user.setUname("8945");
user.setPwd(55);
Session.insert("aa.addUser",user);
Session.commit();
}
================================================
添加用户之返回Id
<!-- 添加用户返回Id -->
<insert id="addUserId">
<selectKey keyProperty="id" resultType="Integer" order="AFTER" >
select LAST_INSERT_ID()
</selectKey>
insert into user (uname,pwd) values (#{uname},#{pwd})
</insert>
@Test
public void testadd() throws IOException {
//加载核心配置文件
String resource="SqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
//创建sqlsessionFactory
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建sqlsession
SqlSession Session = build.openSession();
User user=new User();
user.setUname("8945");
user.setPwd(55);
Session.insert("aa.addUserId",user);
Session.commit();
System.out.println(user.getId());
}
====================================
修改用户信息
<!-- 更新用户 -->
<update id="updateUser" parameterType="Bean.User">
update user set uname=#{uname},pwd=#{pwd} where id=#{id}
</update>
@Test
public void testUpdate() throws IOException {
//加载核心配置文件
String resource="SqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
//创建SqlsessionFactory
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建sqlsession
SqlSession Session = build.openSession();
User user=new User();
user.setUname("王八");
user.setId(14);
Session.update("aa.updateUser",user);
Session.commit();
}
=============================================
删除用户
<!-- 删除用户 -->
<delete id="deleteUser" parameterType="Integer">
delete from user where id=#{s}
</delete>
@Test
public void testdelete() throws IOException {
//加载核心配置文件
String resource="SqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
//创建SqlsessionFactory
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
//创建sqlsession
SqlSession Session = build.openSession();
Session.delete("aa.deleteUser", 13);
Session.commit();
}
=============================================
如果你喜欢,或者有帮助到你的地方可以关注我的微信公众号,田园折耳,