mybatis开发时报错：
org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'str' in 'class java.lang.String'
问题出在判断这行
<if test="str != null">
WHERE phone_md5 = #{str}
</if>
应该String类型变量用_parameter替换
<if test="_parameter != null">
WHERE phone_md5 = #{str}
</if>
