mybaits trim用法

prefix : 給<trim>包裹的sql語句加上前綴.

suffix : 給<trim>包裹的sql語句加上後綴.

prefixOverrides: 若是<trim>包裹的sql語句是空語句（常常出如今 if 判斷爲否的狀況下）,取消指定的前綴，如where.

suffixOverrides: 若是<trim>包裹的sql語句是空語句（常常出如今 if 判斷爲否的狀況下）,取消指定的後綴，如and | or. 逗號等

<!-- 新增--><insert id="save" parameterType="com.yp.api.qa.model.QuestionTemplate" keyProperty="id">   insert into yp_qa.q_question_template   <trim prefix="(" suffix=")" suffixOverrides="," >      <if test="cateid != null">         cateid,      </if>      <if test="title != null">         title,      </if>      <if test="author != null">         author,      </if>      <if test="type != null">         type,      </if>      <if test="img != null">         img,      </if>      <if test="video != null">         video,      </if>      <if test="music != null">         music,      </if>      <if test="hydesc != null">         hydesc,      </if>      <if test="uid != null">         uid,      </if>         createtime,      <if test="tags != null">         tags,      </if>      <if test="accountid != null">         accountid,      </if>   </trim>   <trim prefix="values (" suffix=")" suffixOverrides="," >      <if test="cateid != null">         #{cateid},      </if>      <if test="title != null">         #{title},      </if>      <if test="author != null">         #{author},      </if>      <if test="type != null">         #{type},      </if>      <if test="img != null">         #{img},      </if>      <if test="video != null">         #{video},      </if>      <if test="music != null">         #{music},      </if>      <if test="hydesc != null">         #{hydesc},      </if>      <if test="uid != null">         #{uid},      </if>         now(),      <if test="tags != null">         #{tags},      </if>      <if test="accountid != null">         #{accountid},      </if>   </trim></insert>