mysql中查询字段为null的数据navicat问题

想知道在Linux中你正在使用的网卡是什么吗？ 在Linux中很容易就找出网卡的生产商。打开一个终端并输入下面的额命令：复制代码代码如下:sudo lshw -C network假如上面的命令不能在sudo下使用，那就别用 sudo 的特权模式。它的输出看上去有点奇怪但是很有用。复制代码代码如下: *-network description: Wireless interface product: BCM4360 802.11ac Wireless Network Adapter vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:03:00.0 logical name: wlan0 version: 03 serial: 9c:f3:87:c1:5d:6a width: 64 bits clock: 33MHz capabilities: busmaster caplist ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=6.30.223.248 (r487574) ip=192.168.1.23 latency=0 multicast=yes wireless=IEEE 802.11abg resources: irq:18 memory:b0600000-b0607fff memory:b0400000-b05fffff如你所见，我Macbook Air上的无线网卡是BCM4360，这是一款在Ubuntu下面很容易出现无法检测无线网络问题的网卡。lshw 命令实际上是用来列出硬件的，因此命令的名字是lshw。带上网络的选项后，就会只过滤出网络硬件了。了解网卡的其他方法另外你还可以使用lspci命令来显示PCI总线上的信息。你应该使用普通用户来运行这个命令。只需要在命令行下输入：复制代码代码如下: lspci命令的输出看上去想这样：复制代码代码如下: 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09) 00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 09) 00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) 00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04) 00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 1 (rev e4) 00:1c.1 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 2 (rev e4) 00:1c.2 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4) 00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4) 00:1c.5 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 6 (rev e4) 00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04) 00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04) 02:00.0 Multimedia controller: Broadcom Corporation Device 1570 03:00.0 Network controller: Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter (rev 03) 04:00.0 SATA controller: Marvell Technology Group Ltd. 88SS9183 PCIe SSD Controller (rev 14)这些命令会同时列出有线和无线的网卡。你应该注意到上面的输出中显示我的系统中没有有线网卡。因为我使用的是Macbook Air，它没有以太网端口