<!--通过map进行条件查询-->
<select id="selectByMap" resultType="com.heiketu.testpackage.pojo.Product">
? ? select * from Products where prod_price = #{prodPrice} and prod_desc = #{prodDesc}
</select>

//输入参数为Map的条件查询
Product selectByMap(Map<String,Object> map);

//...前面有创建sqlSessionFactory对象和SQLSession对象的代码
Map<String,Object> map = new HashMap<>();
map.put("prodPrice","11.99");
map.put("prodDesc","18 inch teddy bear, comes with cap and jacket");
ProductsMapper mapper = sqlSession.getMapper(ProductsMapper.class);
Product product = mapper.selectByMap(map);
System.out.println(product);

<!--如果是List集合(或set集合)就如下入参取值-->
<select id="selectByMap" resultType="com.heiketu.testpackage.pojo.Product">
? ? select * from Products where prod_price = #{list[0]} and prod_desc = #{collection[1]}
</select>

<!--如果是数组就如下入参取值-->
<select id="selectByMap" resultType="com.heiketu.testpackage.pojo.Product">
? ? select * from Products where prod_price = #{array[0]} and prod_desc = #{array[1]}
</select>

<select id="getObjectByMap" parameterType="map" resultMap="BaseResultMap">
        select
            <include refid="Base_Column_List" />
        from
            s_app
        <where>
            <foreach collection="map" item="v" index="k" separator="and">
                <if test="v != null and v != ''">
                    ${k} = #{v}
                </if>
                <!--<choose>
                    <when test="v instanceof integer">
                        <if test="v != null">
                            ${k} = #{v}
                        </if>
                    </when>
                    <when test="v instanceof list">
                        <if test="v != null and v.size() > 0">
                            ${k} in
                            <foreach collection="list" item="v" separator="," open="(" close=")">
                                #{v}
                            </foreach>
                        </if>
                    </when>
                    <when test="v instanceof array">
                        <if test="v != null and v.length > 0">
                            ${k} in
                            <foreach collection="array" item="v" separator="," open="(" close=")">
                                #{v}
                            </foreach>
                        </if>
                    </when>
                    <otherwise>
                        <if test="v != null and v != ''">
                            ${k} = #{v}
                        </if>
                    </otherwise>
                </choose>-->
            </foreach>
        </where>
    </select>

    @PostMapping({"demo"})
    public AjaxResult demo(String appNo, String name) {
        Map map = Map.of("app_no", appNo, "cust_name", name);
        SApp objectByMap = service.getObjectByMap(map);
        return success(objectByMap);
    }

public interface SAppMapper extends BaseMapper<SApp> {
    SApp getObjectByMap(@Param("map") Map<String, Object> map);
}