Question

如何基于字符串中的月份名称（一月，二月，三月等）获取月份差异作为整数？

例如，我有一个变量declare @month varchar(20) = 'May'；并选择DATEDIFF(month, month(getdate()), @month)为7（十月和五月之间的差异）。

Answer 1

在SQL Server中，您将使用datediff()：

select datediff(month, '2010-01-15', '2011-02-28')

这将计算两个日期之间的月边界数。这听起来像是对您问题的合理解释。

Answer 2

Declare @M1 varchar(25) = 'October'
Declare @M2 varchar(25) = 'May'

Select DateDiff(MONTH,@M1+' 01 1980',@M2+' 01 1980')
       +case when DateDiff(MONTH,@M1+' 01 1980',@M2+' 01 1980')<0 then 12 else 0 end

返回7

Answer 3

DECLARE @M1 as varchar(20) = 'October';
DECLARE @M2 as varchar(20) = 'May';

SELECT ABS(datediff(mm,
                    convert(datetime, @M1 + ' 1 2012 11:01AM', 100),
                    convert(datetime, @M2 + ' 1 2012 11:01AM', 100) 
                    )
        );

这不允许很多年了，您以前没有提到

Answer 4

假设input1，input2，就可以了：

declare @input1 nvarchar(max)='October'
declare @input2 nvarchar(max)='May'

select 
    case 
        when DATEPART(MM,@input1+' 01 2011')>DATEPART(MM,@input2+' 01 2011') 
            then 12 
        else 0
    end-DATEPART(MM,@input1+' 01 2011')+DATEPART(MM,@input2+' 01 2011')

Answer 5

尝试

select  DATEPART(MM,'march 01 2011') - DATEPART(MM,'january 01 2011')

Answer 6

不确定您要做什么，但是类似的事情可能起作用：

select MONTH(STR_TO_DATE('October', '%M')) - MONTH(STR_TO_DATE('May', '%M')) -- returns 5

Answer 7

尝试一下

class CustomWebviewClient : WebViewClient() {
    private val charsetPattern = Pattern.compile(".*?charset=(.*?)(;.*)?$")

    override fun shouldInterceptRequest(view: WebView, request: WebResourceRequest): WebResourceResponse? {
        try {
            val connection: HttpURLConnection = URL(request.url.toString()).openConnection() as HttpURLConnection
            connection.requestMethod = request.method
            for ((key, value) in request.requestHeaders) {
                connection.addRequestProperty(key, value)
            }

            connection.addRequestProperty("custom header key", "custom header value")

            var contentType: String? = connection.contentType
            var charset: String? = null
            if (contentType != null) {
                // some content types may include charset => strip; e. g. "application/json; charset=utf-8"
                val contentTypeTokenizer = StringTokenizer(contentType, ";")
                val tokenizedContentType = contentTypeTokenizer.nextToken()

                var capturedCharset: String? = connection.contentEncoding
                if (capturedCharset == null) {
                    val charsetMatcher = charsetPattern.matcher(contentType)
                    if (charsetMatcher.find() && charsetMatcher.groupCount() > 0) {
                        capturedCharset = charsetMatcher.group(1)
                    }
                }
                if (capturedCharset != null && !capturedCharset.isEmpty()) {
                    charset = capturedCharset
                }

                contentType = tokenizedContentType
            }

            val status = connection.responseCode
            var inputStream = if (status == HttpURLConnection.HTTP_OK) {
                connection.inputStream
            } else {
                // error stream can sometimes be null even if status is different from HTTP_OK
                // (e. g. in case of 404)
                connection.errorStream ?: connection.inputStream
            }
            val headers = connection.headerFields
            val contentEncodings = headers.get("Content-Encoding")
            if (contentEncodings != null) {
                for (header in contentEncodings) {
                    if (header.equals("gzip", true)) {
                        inputStream = GZIPInputStream(inputStream)
                        break
                    }
                }
            }
            return WebResourceResponse(contentType, charset, status, connection.responseMessage, convertConnectionResponseToSingleValueMap(connection.headerFields), inputStream)
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return super.shouldInterceptRequest(view, request)
    }

    private fun convertConnectionResponseToSingleValueMap(headerFields: Map<String, List<String>>): Map<String, String> {
        val headers = HashMap<String, String>()
        for ((key, value) in headerFields) {
            when {
                value.size == 1 -> headers[key] = value[0]
                value.isEmpty() -> headers[key] = ""
                else -> {
                    val builder = StringBuilder(value[0])
                    val separator = "; "
                    for (i in 1 until value.size) {
                        builder.append(separator)
                        builder.append(value[i])
                    }
                    headers[key] = builder.toString()
                }
            }
        }
        return headers
    }
}

Answer 8

我将获得所需月份（在您的情况下为5月）与当前月份之间的差额，如果差额小于0，则将其加上月数（12）进行计算，否则将无任何结果添加。这只是以上更好的答案之一

declare @RequiredMonth varchar(25) = 'February';
declare @difference as int;

set @difference = MONTH(cast(@RequiredMonth+'1 2016' as datetime)) - MONTH(getdate())

select case when  @difference >= 0 then  @difference else @difference + 12 end

Answer 9

您可以使用类似这样的内容：

DECLARE
    @month varchar(20) = 'May'

SELECT DATEDIFF(MONTH, GETDATE(), EndDate)
FROM (SELECT CAST(@month  + CAST( YEAR(GETDATE()) + 1 AS VARCHAR(4))  AS DATE) EndDate) D

如何在SQL Server中获取月份（字符串）差异

9 个答案: