WebRoot/WEB-INF/classes/com/mapper/UsersMapper.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.UsersMapper">
  <resultMap id="BaseResultMap" type="com.entity.Users">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="username" jdbcType="VARCHAR" property="username" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="realname" jdbcType="VARCHAR" property="realname" />
    <result column="birthday" jdbcType="VARCHAR" property="birthday" />
    <result column="idcard" jdbcType="VARCHAR" property="idcard" />
    <result column="contact" jdbcType="VARCHAR" property="contact" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="address" jdbcType="VARCHAR" property="address" />
    <result column="address2" jdbcType="VARCHAR" property="address2" />
    <result column="regdate" jdbcType="VARCHAR" property="regdate" />
    <result column="isdel" jdbcType="VARCHAR" property="isdel" />
    <result column="utype" jdbcType="VARCHAR" property="utype" />
  </resultMap>
  <sql id="Base_Column_List">
    id, username, password, realname, birthday, idcard, contact, email, address2,  regdate, 
    isdel, utype
  </sql>
   <select id="adminLogin"  parameterType="java.util.Map" resultMap="BaseResultMap" >
    select 
    <include refid="Base_Column_List" />
    from users
    where utype = #{utype,jdbcType=VARCHAR} and isdel="0"  and username = #{username,jdbcType=VARCHAR} and password=#{password,jdbcType=VARCHAR} 
  </select>
  <select id="checkUname"  parameterType="java.util.Map" resultMap="BaseResultMap" >
    select 
    <include refid="Base_Column_List" />
    from users
    where username = #{username,jdbcType=VARCHAR} and isdel="0"
  </select>
 <select id="getCount"   resultType="int" parameterType="java.util.Map" >
    select  count(*) from users  where isdel="0"
    <if test="utype!=null">
    and utype =#{utype}
    </if>
  </select> 
  <select id="getAll"   resultMap="BaseResultMap" parameterType="java.util.Map" >
    select  * from users  where isdel="0"
    <if test="utype!=null">
    and utype =#{utype}
    </if>
  </select> 
   <select id="getByPage" parameterType="java.util.Map" resultMap="BaseResultMap">
     select *from users where isdel="0" 
     <if test="username!=null">
   <!--  and username like  concat('%',#{username,jdbcType=VARCHAR},'%') -->
    and username = #{username,jdbcType=VARCHAR}
     </if>
     <if test="utype!=null">
    and utype =#{utype}
     </if>
     <if test="pageno!=null and pageSize!=null">
     limit #{pageno},#{pageSize}
     </if>
     </select>