插入sql语句时出错，把错误内容写log
接口文件往数据库中插入数据，如果没有执行成功，如何把报的错误写在log里面？
------解决方案--------------------
insert失败后，记录mysql_error()就可以了。
------解决方案--------------------
mysqli_error 需要传递参数进去,但是你没传递进去.
$link=mysqli_conn...
mysqli_error($link);
------解决方案--------------------
mysql_error()就可以
如果是mysqli_error()，需要加一个mysqli对象的参数
http://www.nusphere.com/kb/phpmanual/function.mysqli-error.htm
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