如下圖所示，mybatis刪除數(shù)據(jù)異常：

log4j調試的信息表示SQL語句應該是對的，然而數(shù)據(jù)庫中并沒有刪除信息。

相關的配置文件及代碼如下：

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"> <!-- 命名空間不能省略，類似于package -->
 
  <resultMap type="model.Message" id="MessageResult">
    <id column="ID" jdbcType="VARCHAR" property="id"/> <!-- id是查找結果集的主鍵 -->
    <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層方法：

 public void deleteOne(int id){
        DBAccess dbAccess = new DBAccess();
        SqlSession sqlSession = null;
        try{
            sqlSession = dbAccess.getSqlSession();//實例化并打開數(shù)據(jù)庫會話
            sqlSession.delete("Message.deleteOne",id);//message.xml配置文件中對應ID號的SQL語句
        }catch(IOException e){
            e.printStackTrace();
        }finally{
            if(sqlSession!=null){
                sqlSession.close();
            }
        }
    }

service層方法

 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");
        //獲取頁面的值
        String id = request.getParameter("id");
        MaintainService maintainService = new MaintainService();
        maintainService.deleteOne(id);
        //dao方法和跳轉頁面
        try {
            request.getRequestDispatcher("/servlet/ShowServlet").forward(request,response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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