ipv4_compare()ipv4_compare()

• 10/29/2020
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比较两个 IPv4 字符串。Compares two IPv4 strings. 分析并比较两个 IPv4 字符串，同时考虑根据参数前缀和可选的 PrefixMask 参数计算出的组合 IP 前缀掩码。The two IPv4 strings are parsed and compared while accounting for the combined IP-prefix mask calculated from argument prefixes, and the optional PrefixMask argument.

ipv4_compare("127.0.0.1", "127.0.0.1") == 0
ipv4_compare('192.168.1.1', '192.168.1.255') < 0
ipv4_compare('192.168.1.1/24', '192.168.1.255/24') == 0
ipv4_compare('192.168.1.1', '192.168.1.255', 24) == 0

语法Syntax

ipv4_compare(Expr1, Expr2[ ,PrefixMask])ipv4_compare(Expr1, Expr2[ ,PrefixMask])

参数Arguments

• Expr1、Expr2：表示 IPv4 地址的字符串表达式。Expr1 , Expr2 : A string expression representing an IPv4 address. 可以使用 IP 前缀表示法对 IPv4 字符串进行掩码操作。IPv4 strings can be masked using IP-prefix notation.
• PrefixMask：从 0 到 32 的整数，表示所考虑的最有效位的数目。PrefixMask : An integer from 0 to 32 representing the number of most-significant bits that are taken into account.

IP 前缀表示法IP-prefix notation

IP 地址可以通过斜杠 (/) 字符使用 IP-prefix notation 进行定义。IP addresses can be defined with IP-prefix notation using a slash (/) character. 斜杠 (/) 左边的 IP 地址是基本 IP 地址。The IP address to the LEFT of the slash (/) is the base IP address. 斜杠 (/) 右边的数字（1 到 32）是网络掩码中连续位的数目。The number (1 to 32) to the RIGHT of the slash (/) is the number of contiguous 1 bit in the netmask.

例如，192.168.2.0/24 将具有关联的网络/子网掩码，其中包含 24 个连续位或点分十进制格式的 255.255.255.0。For example, 192.168.2.0/24 will have an associated net/subnetmask containing 24 contiguous bits or 255.255.255.0 in dotted decimal format.

返回Returns

• 0：如果第一个 IPv4 字符串参数的长表示形式等于第二个 IPv4 字符串参数0: If the long representation of the first IPv4 string argument is equal to the second IPv4 string argument
• 1：如果第一个 IPv4 字符串参数的长表示形式大于第二个 IPv4 字符串参数1: If the long representation of the first IPv4 string argument is greater than the second IPv4 string argument
• -1：如果第一个 IPv4 字符串参数的长表示形式小于第二个 IPv4 字符串参数-1: If the long representation of the first IPv4 string argument is less than the second IPv4 string argument
• null：如果两个 IPv4 字符串之一转换不成功。null: If conversion for one of the two IPv4 strings wasn't successful.

示例:IPv4 比较相等的情况Examples: IPv4 comparison equality cases

使用 IPv4 字符串中指定的 IP 前缀表示法比较 IPCompare IPs using the IP-prefix notation specified inside the IPv4 strings

datatable(ip1_string:string, ip2_string:string)
[
 '192.168.1.0',    '192.168.1.0',       // Equal IPs
 '192.168.1.1/24', '192.168.1.255',     // 24 bit IP-prefix is used for comparison
 '192.168.1.1',    '192.168.1.255/24',  // 24 bit IP-prefix is used for comparison
 '192.168.1.1/30', '192.168.1.255/24',  // 24 bit IP-prefix is used for comparison
]
| extend result = ipv4_compare(ip1_string, ip2_string)

使用 IPv4 字符串中指定的 IP 前缀表示法作为 ipv4_compare() 函数的附加参数比较 IPCompare IPs using IP-prefix notation specified inside the IPv4 strings and as additional argument of the ipv4_compare() function

datatable(ip1_string:string, ip2_string:string, prefix:long)
[
 '192.168.1.1',    '192.168.1.0',   31, // 31 bit IP-prefix is used for comparison
 '192.168.1.1/24', '192.168.1.255', 31, // 24 bit IP-prefix is used for comparison
 '192.168.1.1',    '192.168.1.255', 24, // 24 bit IP-prefix is used for comparison
]
| extend result = ipv4_compare(ip1_string, ip2_string, prefix)