8. sql 片段

sql 片段：

<sql id="columnBase">

`id`,

`title`,

`author_id` as authorId,

`state`,

`featured`,

`style`

</sql>

 

实际应用在代码中：

 <sql id="periodicalColumns">
         a.id AS "id",
         a.name AS "name",
         a.country AS "country",
         a.type AS "type",
         a.publish AS "publish",
         a.introduction AS  "introduction",
         a.logo AS "logo",
         a.company AS "company",
         a.CN AS "cn",
         a.size AS "size",
         a.address AS "address",
         a.ISSN AS "issn",
         a.languages AS "languages",
         a.email AS "email",
         a.year AS "year",
         a.create_by AS "createBy.id",
         a.create_date AS "createDate",
         a.update_by AS "updateBy.id",
         a.update_date AS "updateDate",
         a.remarks AS "remarks",
         a.del_flag AS "delFlag"
     </sql>

最后贴一个分完整的代码：

 <?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.thinkgem.jeesite.modules.tpydg.periodical.dao.PeriodicalDao">

     <sql id="periodicalColumns">
         a.id AS "id",
         a.name AS "name",
         a.country AS "country",
         a.type AS "type",
         a.publish AS "publish",
         a.introduction AS  "introduction",
         a.logo AS "logo",
         a.company AS "company",
         a.CN AS "cn",
         a.size AS "size",
         a.address AS "address",
         a.ISSN AS "issn",
         a.languages AS "languages",
         a.email AS "email",
         a.year AS "year",
         a.create_by AS "createBy.id",
         a.create_date AS "createDate",
         a.update_by AS "updateBy.id",
         a.update_date AS "updateDate",
         a.remarks AS "remarks",
         a.del_flag AS "delFlag"
     </sql>

     <sql id="periodicalJoins">
     </sql>

     <select id="get" resultType="Periodical">
         SELECT
             <include refid="periodicalColumns"/>
         FROM periodical a
         <include refid="periodicalJoins"/>
         WHERE a.id = #{id}
     </select>

     <select id="findList" resultType="Periodical">
         SELECT
             <include refid="periodicalColumns"/>
         FROM periodical a
         <include refid="periodicalJoins"/>
         <where>
             a.del_flag = #{DEL_FLAG_NORMAL}
             <if test="type != null and type != ''">
                 AND  type = #{type}
             </if>
             <if test="name != null and name != ''">
                 AND a.name LIKE
                     <if test="dbName == 'oracle'">'%'||#{name}||'%'</if>
                     <if test="dbName == 'mssql'">'%'+#{name}+'%'</if>
                     <if test="dbName == 'mysql'">concat('%',#{name},'%')</if>
             </if>
         </where>
         <choose>
             <when test="page !=null and page.orderBy != null and page.orderBy != ''">
                 ORDER BY ${page.orderBy}
             </when>
             <otherwise>
                 ORDER BY a.update_date DESC
             </otherwise>
         </choose>
     </select>

     <select id="findAllList" resultType="Periodical">
         SELECT
             <include refid="periodicalColumns"/>
         FROM periodical a
         <include refid="periodicalJoins"/>
         <where>
             a.del_flag = #{DEL_FLAG_NORMAL}
         </where>
         <choose>
             <when test="page !=null and page.orderBy != null and page.orderBy != ''">
                 ORDER BY ${page.orderBy}
             </when>
             <otherwise>
                 ORDER BY a.update_date DESC
             </otherwise>
         </choose>
     </select>

     <insert id="insert">
         INSERT INTO periodical(
             id,
             name,
             country,
             type,
             publish,
             introduction,
             logo,
             company,
             CN,
             size,
             address,
             ISSN,
             languages,
             email,
             year,
             create_by,
             create_date,
             update_by,
             update_date,
             remarks,
             del_flag
         ) VALUES (
             #{id},
             #{name},
             #{country},
             #{type},
             #{publish},
             #{introduction},
             #{logo},
             #{company},
             #{cn},
             #{size},
             #{address},
             #{issn},
             #{languages},
             #{email},
             #{year},
             #{createBy.id},
             #{createDate},
             #{updateBy.id},
             #{updateDate},
             #{remarks},
             #{delFlag}
         )
     </insert>

     <update id="update">
         UPDATE periodical SET
             name = #{name},
             country = #{country},
             type = #{type},
             introduction = #{introduction},
             logo = #{logo},
             company = #{company},
             CN = #{cn},
             size = #{size},
             address = #{address},
             ISSN = #{issn},
             languages = #{languages},
             email = #{email},
             year = #{year}
         WHERE id = #{id}
     </update>

     <update id="delete">
         UPDATE periodical SET
             del_flag = #{DEL_FLAG_DELETE}
         WHERE id = #{id}
     </update>

 </mapper>