我想在Coldfusion中循环存储过程。我有以下代码循环查询。
I3
现在,查询已被如下所示的存储过程所代替,我想执行与上述代码相同的循环功能。在存储过程中,我确实有与上面相同的查询。先感谢您!
<cfquery name="rates" dbtype="query">
select code, rate
from application.qry.currency
where code = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.origCode#" />
or code = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.toCode#" />
</cfquery>
<cfloop query="rates">
<cfscript>
if (code == arguments.origCode) origRate = rate;
if (code == arguments.toCode) toRate = rate;
</cfscript>
</cfloop>
上面的完整代码:
<cfstoredproc procedure="usp_get_rates" datasource="#variables.dsn#">
<cfprocparam cfsqltype="cf_sql_varchar" dbvarname="@origCode" type="in" value="#arguments.origCode#"/>
<cfprocparam cfsqltype="cf_sql_varchar" dbvarname="@toCode" type="in" value="#arguments.toCode#" />
</cfstoredproc>
<cffunction name="convertCurrency" access="public" output="false" returntype="string">
<cfargument name="amount" required="true" type="numeric" />
<cfargument name="origCode" required="true" type="string" />
<cfargument name="toCode" required="true" type="string" />
<cfscript>
var theAmount = 0;
var origRate = 0;
var toRate = 0;
var baseVal = 0;
var newVal = 0;
if (isNumeric(arguments.amount)) theAmount = arguments.amount;
if (arguments.origCode == 'USD' && arguments.toCode == 'USD' || theAmount == 0) return theAmount;
if (not isDefined("application.qry.currency")) initCurrencyRecordset();
</cfscript>
<cfquery name="rates" dbtype="query">
select code, rate
from application.qry.currency
where code = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.origCode#" />
or code = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.toCode#" />
</cfquery>
<cfloop query="rates">
<cfscript>
if (code == arguments.origCode) origRate = rate;
if (code == arguments.toCode) toRate = rate;
</cfscript>
</cfloop>
<cfscript>
if (origRate neq 0){
baseVal = theAmount * (1 / origRate);
newVal = baseVal * toRate;
}
else {
baseVal = theAmount * 1;
newVal = baseVal * toRate;
}
return newVal;
</cfscript>
答案 0 :(得分:1)
根据到目前为止的详细信息,完成您所要的.....
我假设您的存储过程看起来像这样:
CREATE PROCEDURE dbo.usp_get_rates @origCode varchar(20), @toCode varchar(20)
AS
BEGIN
SET NOCOUNT ON ;
SELECT code, rate
FROM dbo.currency
WHERE code IN ( @origCode, @toCode )
END;
GO
注意:您想用任何合适的数据库模式替换“ dbo”。但是,如果您要跨数据库查询(请参见上面有关application.qry.currency
的评论),则将保持FROM
调用不变,并在适当的架构中放置/引用存储过程。 < / p>
通过该过程,您的ColdFusion代码将类似于:
<cfstoredproc procedure="usp_get_rates" datasource="#variables.dsn#">
<cfprocparam cfsqltype="cf_sql_varchar" dbvarname="@origCode" type="in" value="#arguments.origCode#">
<cfprocparam cfsqltype="cf_sql_varchar" dbvarname="@toCode" type="in" value="#arguments.toCode#">
<cfprocresult name="rates">
</cfstoredproc>
<cfscript>
// Initialize your variables. They won't exist if your query has 0 rows.
var origRate = 0 ; // Or expected datatype
var toRate = 0 ; // Or expected datatype
for (var thisrow in rates) {
if ( thisrow.code == arguments.origCode ) { origRate = thisrow.rate ; }
if ( thisrow.code == arguments.toCode) { toRate = thisrow.rate ; }
}
</cfscript>
由于您使用的是arguments
范围,因此我假设此代码位于函数内部。这样一来,您就可以使用var
关键字。
请注意,dbvarname
自CFMX以来已被忽略,并已在CF11 Update 3中恢复。CF11具有JVM标志(-Dcoldfusion.ignoredbvarname
)以继续忽略dbvarname
,但该标志在CF2016 +中被忽略。
您可以使用简单的for
循环遍历查询,但是正如我上面所说,这可能并不是您真正想要的。如果查询/存储过程返回多个结果,则将为多个返回的值覆盖origRate
或toRate
。也就是说,如果您的查询中包含[{code:"x",rate:41},{code:"x",rate:42}]
,它将覆盖rate
的{{1}}。