判断php操作mysql（添删改查）是否成功
最近在使用CI框架 , 但是里面的数据库操作没有ThinkPhp方便 , 不知道数据库操作的反馈信息 , 只好借助原生方法来判断是否操作数据库成功
判断php操作mysql（添删改查）是否成功，主要借助两个函数
1. mysql_num_rows(data) 函数返回结果集中行的数目
2.mysql_affected_rows() 函数返回前一次 MySQL 操作所影响的记录行数
mysql_num_rows(data)主要用于select操作，返回值有三种情况
1.返回为0表示select取得值为0，没有获取到任何的结果
2.返回值为NULL,表示上一条select语句有错误
3.返回值大于0，表示满足条件的行数
mysql_affected_rows()主要用于insert、update、delete三种操作
1.返回值为0 表示受影响的行数为0
2.返回值为-1 表示上一条sql语句有问题
3.返回值大于0 表示受影响的行数
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