MyBatis删除数据异常，无法删除数据

Question

如下图所示，mybatis删除数据异常：

log4j调试的信息表示SQL语句应该是对的，然而数据库中并没有删除信息。
相关的配置文件及代码如下：
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="Message"> <!-- 命名空间不能省略，类似于package -->


  <resultMap type="model.Message" id="MessageResult">
    <id column="ID" jdbcType="VARCHAR" property="id"/> <!-- id是查找结果集的主键 -->
    <result column="COMMAND" jdbcType="VARCHAR" property="command"/>
    <result column="DESCRIPTION" jdbcType="VARCHAR" property="description"/>
    <result column="CONTENT" jdbcType="VARCHAR" property="content"/>
  </resultMap>

  <select id="Message.queryAll" resultMap="MessageResult">
    SELECT ID,COMMAND,DESCRIPTION,CONTENT FROM message WHERE 1=1
    <if test="command != null and !&quot;&quot;.equals(command.trim())">and COMMAND LIKE '%' #{command} '%'</if>
    <if test="description != null and !&quot;&quot;.equals(description.trim())">and DESCRIPTION LIKE '%' #{description} '%'</if>
  </select>

  <delete id="deleteOne" parameterType="java.lang.Integer">
    DELETE FROM message WHERE ID=#{_parameter}
  </delete>
</mapper>

DAO层方法：

 public void deleteOne(int id){
        DBAccess dbAccess = new DBAccess();
        SqlSession sqlSession = null;
        try{
            sqlSession = dbAccess.getSqlSession();//实例化并打开数据库会话
            sqlSession.delete("Message.deleteOne",id);//message.xml配置文件中对应ID号的SQL语句
        }catch(IOException e){
            e.printStackTrace();
        }finally{
            if(sqlSession!=null){
                sqlSession.close();
            }
        }
    }

service层方法

 package service;

import dao.MessageDAO;

public class MaintainService {
    public void deleteOne(String id){
        if(id != null && !"".equals(id.trim())){
            MessageDAO messageDao = new MessageDAO();
            messageDao.deleteOne(Integer.valueOf(id));
        }

    }

}

Servlet

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //获取页面的值
        String id = request.getParameter("id");
        MaintainService maintainService = new MaintainService();
        maintainService.deleteOne(id);
        //dao方法和跳转页面
        try {
            request.getRequestDispatcher("/servlet/ShowServlet").forward(request,response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

求各路大神解答，谢谢！

Answer 1

谢谢大家！是因为没有手动提交事务，要加上语句sqlSession.commit();