小编Chr*_*son的帖子

我正在尝试存储和索引 IP 地址。我从一个简单而愚蠢的表格开始：

CREATE TABLE [dbo].[IP_addresses](
    [IP_as_text] [char](16) NOT NULL,
    [IP]  AS ([dbo].[fnBinaryIPv4]([IP_as_text]))
) ON [PRIMARY]

哪里fnBinaryIPv4来自/sf/ask/96988671/。

CREATE FUNCTION dbo.fnBinaryIPv4(@ip AS VARCHAR(15)) RETURNS BINARY(4)
AS
BEGIN
    DECLARE @bin AS BINARY(4)

    SELECT @bin = CAST( CAST( PARSENAME( @ip, 4 ) AS INTEGER) AS BINARY(1))
                + CAST( CAST( PARSENAME( @ip, 3 ) AS INTEGER) AS BINARY(1))
                + CAST( CAST( PARSENAME( @ip, 2 ) AS INTEGER) AS BINARY(1))
                + CAST( CAST( PARSENAME( @ip, 1 ) AS INTEGER) AS BINARY(1)) …