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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.forum.dao.TagDao">
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<select id="getTag" resultType="Tag">
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select id,name from tag where id = #{id}
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</select>
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<insert id="saveTag" parameterType="Tag">
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insert into tag values (#{id},#{name});
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</insert>
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<!--两个id可能会相冲，取别名即可-->
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<resultMap id="tags" type="Tag">
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<id property="id" column="tid"/>
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<result property="name" column="name"/>
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<collection property="forums" ofType="Forum">
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<id property="id" column="bid"/>
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<result property="title" column="title"/>
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</collection>
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</resultMap>
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<select id="getAllTag" resultType="com.forum.entity.Tag">
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select * from tag
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</select>
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<select id="getForumTag" resultMap="tags">
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select t.id tid, t.name, b.id bid, b.title
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from tag t, forum b, forum_tags bt
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where t.id = bt.tag_id and b.id = bt.forum_id
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</select>
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<select id="getTagByName" resultType="Tag">
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select * from tag where name = #{name}
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</select>
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<select id="getTagById" resultType="Tag">
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select * from tag where id = #{id}
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</select>
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<select id="countTag" resultType="java.lang.Integer">
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select count(*) from tag
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</select>
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<delete id="deleteTag">
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delete from tag where id = #{id}
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</delete>
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<update id="updateTag" parameterType="Tag">
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update tag set name = #{name} where id = #{id};
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</update>
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</mapper>
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