WebRoot/WEB-INF/classes/com/mapper/TopicMapper.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">
<mapper namespace="com.dao.TopicMapper">
  <resultMap id="BaseResultMap" type="com.entity.Topic">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="uid" jdbcType="INTEGER" property="uid" />
    <result column="bid" jdbcType="INTEGER" property="bid" />
    <result column="num" jdbcType="VARCHAR" property="num" />
    <result column="contents" jdbcType="VARCHAR" property="contents" />
    <result column="addtime" jdbcType="VARCHAR" property="addtime" />
    <result column="status" jdbcType="VARCHAR" property="status" />
  </resultMap>
  <sql id="Base_Column_List">
    id, uid, bid, num, contents, addtime, status
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from topic
    where id = #{id,jdbcType=INTEGER}
  </select>
  <select id="checkUname"  parameterType="java.util.Map" resultMap="BaseResultMap" >
    select 
    <include refid="Base_Column_List" />
    from topic
    where username = #{username,jdbcType=VARCHAR} 
  </select>
 <select id="getCount"   resultType="int" parameterType="java.util.Map" >
    select  count(*) from topic  where 1=1
    <if test="utype!=null">
    and utype =#{utype}
    </if>
  </select> 
  <select id="getAll"   resultMap="BaseResultMap" parameterType="java.util.Map" >
    select  * from topic  where 1=1
    <if test="utype!=null">
    and utype =#{utype}
    </if>
  </select> 
   <select id="getByPage" parameterType="java.util.Map" resultMap="BaseResultMap">
     select *from topic where 1=1 
     <if test="username!=null">
    and username like  concat('%',#{username,jdbcType=VARCHAR},'%')
     </if>
     <if test="utype!=null">
    and utype =#{utype}
     </if>
     <if test="pageno!=null and pageSize!=null">
     limit #{pageno},#{pageSize}
     </if>
     </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from topic
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.entity.Topic">
    insert into topic (id, uid, bid, 
      num, contents, addtime, 
      status)
    values (#{id,jdbcType=INTEGER}, #{uid,jdbcType=INTEGER}, #{bid,jdbcType=INTEGER},