build/classes/com/mapper/MajorMapper.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.MajorDao" >
  <resultMap id="BaseResultMap" type="com.entity.Major" >
    <id column="maid" property="maid" jdbcType="INTEGER" />
    <result column="maname" property="maname" jdbcType="VARCHAR" />
    <result column="collid" property="collid" jdbcType="INTEGER" />
  </resultMap>
  <sql id="Base_Column_List" >
    maid, maname, collid
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from major
    where maid = #{maid,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from major
    where maid = #{maid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.entity.Major" >
    insert into major (maid, maname, collid
      )
    values (#{maid,jdbcType=INTEGER}, #{maname,jdbcType=VARCHAR}, #{collid,jdbcType=INTEGER}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.entity.Major" >
    insert into major
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="maid != null" >
        maid,
      </if>
      <if test="maname != null" >
        maname,
      </if>
      <if test="collid != null" >
        collid,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="maid != null" >
        #{maid,jdbcType=INTEGER},
      </if>
      <if test="maname != null" >
        #{maname,jdbcType=VARCHAR},
      </if>
      <if test="collid != null" >
        #{collid,jdbcType=INTEGER},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.entity.Major" >
    update major
    <set >
      <if test="maname != null" >
        maname = #{maname,jdbcType=VARCHAR},
      </if>
      <if test="collid != null" >
        collid = #{collid,jdbcType=INTEGER},