mybatis之The expression 'oredCriteria' evaluated to a null value的解決方法

<if test="example!= null">
      <include refid="Example_Where_Clause" />
</if>

原因：執行過程中，顯示在使用example的時候，里面的criteria為null；將上面的XML用下面替換

<if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
</if>

例子：

<select id="selectByExampleLimit" resultMap="BaseResultMap">
        select
        <if test="distinct">
            distinct
        </if>
        <include refid="Base_Column_List" />
        from Test
        <if test="_parameter != null" >
            <include refid="Update_By_Example_Where_Clause" />
        </if>
        <if test="orderByClause != null">
            order by ${orderByClause}
        </if>
</select>