Python reads all the data in the table in the XML database and obtains the field names of all tables in the database.

In the work, you need to read the data in the specified XML database and the field names required for the table. Therefore, we can improve the implementation in the existing example:

XML database xmldabase. xml:

<database><manifest><pair key="schema_major_vsn" value="5"/><pair key="schema_minor_vsn" value="63"/><pair key="generation_count" value="8541968"/></manifest><table name="PCI"><row ref="OpaqueRef:1e2c98ee-a6fe-b1d5-e91c-d27911deb21d" __ctime="8489729" __mtime="8489775" _ref="OpaqueRef:1e2c98ee-a6fe-b1d5-e91c-d27911deb21d" attached_VMs="()" class_id="03" class_name="Display controller" dependencies="()" device_id="2000" device_name="ASPEED Graphics Family" functions="1" host="OpaqueRef:d92d7211-482f-c68f-f89b-4c8b22faec1a" other_config="()" pci_id="0000:09:00.0" uuid="5907d30d-7d53-4682-4ff1-ed32974cb3b6" vendor_id="1a03" vendor_name="ASPEED Technology, Inc."/></table><table name="xx_metrics"><row ref="OpaqueRef:5105a1b6-a689-15a9-708d-57417c69d4b4" __ctime="8489729" __mtime="8490755" _ref="OpaqueRef:5105a1b6-a689-15a9-708d-57417c69d4b4" carrier="true" device_id="10d3" device_name="82574L Gigabit Network Connection" duplex="true" io__read_kbs="0." io__write_kbs="0." last_updated="20130508T00:02:46Z" other_config="()" pci_bus_path="0000:06:00.0" speed="1000" uuid="a26a8b42-b4c1-1b3c-1236-ea62d2d05236" vendor_id="8086" vendor_name="Intel Corporation"/><row ref="OpaqueRef:63f81794-55b1-af60-5225-900673b300d2" __ctime="8489729" __mtime="8490752" _ref="OpaqueRef:63f81794-55b1-af60-5225-900673b300d2" carrier="false" device_id="10d3" device_name="82574L Gigabit Network Connection" duplex="false" io__read_kbs="0." io__write_kbs="0." last_updated="20130508T00:02:46Z" other_config="()" pci_bus_path="0000:07:00.0" speed="65535" uuid="74bc3019-9c04-ca9d-6ea8-3be63840620d" vendor_id="8086" vendor_name="Intel Corporation"/><row ref="OpaqueRef:a0e992d8-5293-581a-0ad1-2b9a00c53d2a" __ctime="8489729" __mtime="8490754" _ref="OpaqueRef:a0e992d8-5293-581a-0ad1-2b9a00c53d2a" carrier="true" device_id="10d3" device_name="82574L Gigabit Network Connection" duplex="true" io__read_kbs="0." io__write_kbs="0." last_updated="20130508T00:02:46Z" other_config="()" pci_bus_path="0000:06:00.0" speed="1000" uuid="fc9d0a76-eb60-dfc8-18b6-bfe26fe8be9d" vendor_id="8086" vendor_name="Intel Corporation"/><row ref="OpaqueRef:f9374ed7-316b-0f53-92d1-f7f70823f6ce" __ctime="8489729" __mtime="8490753" _ref="OpaqueRef:f9374ed7-316b-0f53-92d1-f7f70823f6ce" carrier="true" device_id="10d3" device_name="82574L Gigabit Network Connection" duplex="true" io__read_kbs="0." io__write_kbs="0." last_updated="20130508T00:02:46Z" other_config="()" pci_bus_path="0000:06:00.0" speed="1000" uuid="e4f38332-1317-b9df-07f9-ab5681569c91" vendor_id="8086" vendor_name="Intel Corporation"/></table></database>

Obtain the data of a specified table:

from xml.etree import ElementTreedef get_table_records( xmlfile = None,text = None,table_name=None):    root=None    if xmlfile:        root = ElementTree.parse(xmlfile)    elif text:        root = ElementTree.fromstring(text)        node_findall = root.findall("table")    for e in node_findall:               for key,value in e.items():            if value==table_name:                print( "%s:%s" % (key, value)   )                ar=e.findall('row')                for row in ar:                    for k,v in row.items():                                                print( "%s:%s" % (k, v)   )

Obtain the field names of all tables:

def get_table_field(text =None, xmlfile =None):    root=None    if xmlfile:        root = ElementTree.parse(xmlfile)    elif text:        root = ElementTree.fromstring(text)        node_findall = root.findall("table")    for e in node_findall:        list_field=[]            for key,value in e.items():#                print( "%s:%s" % (key, value)   )                first_row=e.find('row')#                print(type(first_row))                if first_row==None :                    print('%s_need_fields=%s'%(value,list_field))#                    continue                else:                    for k,v in first_row.items():                        list_field.append(k)    #                        print( "%s:%s" % (k, v)   )                        print('%s_need_fields=%s'%(value,list_field))

Test cases:

If _ name _ = '_ main _': # get_table_records (text = open ("xmldabase. XML "). read (), table_name = 'pci ') # get_table_records (xmlfile = "xmldabase. XML ", table_name = 'pci ') get_table_field (xmlfile =" xmldabase. XML ")

Output result:

name:PCIclass_name:Display controllervendor_id:1a03__mtime:8489775host:OpaqueRef:d92d7211-482f-c68f-f89b-4c8b22faec1adependencies:()_ref:OpaqueRef:1e2c98ee-a6fe-b1d5-e91c-d27911deb21ddevice_id:2000functions:1uuid:5907d30d-7d53-4682-4ff1-ed32974cb3b6class_id:03other_config:()__ctime:8489729pci_id:0000:09:00.0device_name:ASPEED Graphics Familyattached_VMs:()vendor_name:ASPEED Technology, Inc.ref:OpaqueRef:1e2c98ee-a6fe-b1d5-e91c-d27911deb21dPCI_need_fields=['class_name', 'vendor_id', '__mtime', 'host', 'dependencies', '_ref', 'device_id', 'functions', 'uuid', 'class_id', 'other_config', '__ctime', 'pci_id', 'device_name', 'attached_VMs', 'vendor_name', 'ref']xx_metrics_need_fields=['last_updated', 'vendor_id', '__mtime', '_ref', 'device_name', 'speed', 'device_id', 'uuid', 'duplex', 'other_config', '__ctime', 'pci_bus_path', 'io__write_kbs', 'carrier', 'io__read_kbs', 'vendor_name', 'ref']