jdao-dynamic.xml

<?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="io.github.donnie4w.jdao.action.Dynamic">

    <!-- where if -->
    <select id="demo1" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest
        <where>
            <if test="rowname!= 'hello'">
                and rowname = #{rowname}
            </if>
            <if test="id >0">
                AND id = #{id}
            </if>
        </where>
    </select>

    <!-- trim -->
    <select id="demo2" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest
        <trim prefix="WHERE" prefixOverrides="AND|OR">
            <if test="rowname != null">
                AND rowname = #{rowname}
            </if>
            <if test="id != null">
                AND id = #{id}
            </if>
        </trim>
    </select>

    <!-- foreach -->
    <select id="demo3" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest where 1=1 and id in
        <foreach collection="list" item="id" index="index" separator="," open="(" close=")">
            #{id}
        </foreach>
    </select>

    <!-- foreach -->
    <select id="demo4" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest where 1=1 and id in
        <foreach collection="hstest" item="item" index="index" separator="," open="(" close=")">
            <if test="item.id > 0">
                #{item.id}
            </if>
        </foreach>
    </select>

    <!-- foreach -->
    <select id="demo5" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest where 1=1 and id in
        <foreach collection="list" item="item" index="index" separator="," open="(" close=")">
            <!-- index>=2 && index <=5 特殊符号需转义 -->
            <if test="index >= 2 &amp;&amp; index &lt;= 5">
                #{item}
            </if>
        </foreach>
    </select>

    <!-- choose -->
    <select id="demo6" resultType="io.github.donnie4w.jdao.dao.Hstest">
        SELECT * FROM hstest where 1=1
        <choose>
            <when test="rowname != 'hello'">
                and rowname = #{rowname}
            </when>
            <when test="id > 0">
                AND id = #{id}
            </when>
            <otherwise>
                AND id = 1
            </otherwise>
        </choose>
    </select>

    <!-- set -->
    <update id="dome7">
        UPDATE hstest1
        <set>
            <trim suffixOverrides=",">
                <if test="rowname != null">
                    rowname = #{rowname},
                </if>
                <if test="value != null">
                    value = #{value},
                </if>
                <if test="goto != null">
                    goto = #{goto},
                </if>
            </trim>
        </set>
        <where>
            id = #{id}
        </where>
    </update>

</mapper>