<!--資料動態sql處理 -->
        <select id="dynamicSql" parameterType="java.util.Map" resultType="com.imooc.mybatis.entity.GoodsEntity">
            <!--編寫sql-->
            select * from t_goods
            <where>
                <!--test中是javabean的屬性判斷-->
                <if
 
 test="categoryId != null">
                    and category_id = #{categoryId}
                </if>
                <if test="currentPrice !=null">
                    <!-- < &lt > &gt & &amp -->
                    and current_price &lt; #{currentPrice}
                
 
</if>
            </where>
        </select>

    public void DynamicSql() throws Exception {
        SqlSession sqlSession = null;
        try {
            //獲取sql物件
            sqlSession = MybatisUtils.openSession();
            //例項化goods,插入資料
            Map map = new HashMap();
            map.put(
 
"categoryId",43);
            map.put("currentPrice",200f);
            //執行sql
            List<GoodsEntity> list = sqlSession.selectList("goods.dynamicSql",map);
            //提交資料
            sqlSession.commit();
            System.out.println(list);
            //檢視連線狀態
            Connection conn = MybatisUtils.getConnection(sqlSession);

        }catch (Exception e){
            sqlSession.rollback();//資料回滾
            throw e;
        }finally {
            MybatisUtils.release(sqlSession);
        }
    }