Question

我想遍历查询并比较列值。这是CFML代码的示例：

<cfquery name="qryUserPerm" datasource="#Application.dsn#">
    SELECT AccessType, AccessLevel, State, City, Building
    FROM Permissions
    WHERE AccountID = <cfqueryparam cfsqltype="cf_sql_integer" value="#trim(session.AccountID)#">
</cfquery>

<cfset local.permissionType = "">
<cfset local.permissionLevel = "">
<cfset local.permissionList = "">

<cfif qryUserPerm.AccessLevel EQ "S">
     <cfset local.permissionType = qryUserPerm.AccessType>
     <cfset local.permissionLevel = qryUserPerm.AccessLevel>
     <cfset local.permissionList = qryUserPerm.State>
<cfelseif qryUserPerm.AccessLevel EQ "C">
     <cfset local.permissionType = qryUserPerm.AccessType>
     <cfset local.permissionLevel = qryUserPerm.AccessLevel>
     <cfset local.permissionList = ListRemoveDuplicates(ValueList(permissionList,qryUserPerm.City))>
<cfelseif qryUserPerm.AccessLevel EQ "B">
     <cfset local.permissionType = qryUserPerm.AccessType>
     <cfset local.permissionLevel = qryUserPerm.AccessLevel>
     <cfset local.permissionList = ListRemoveDuplicates(ValueList(permissionList,qryUserPerm.Building))>
</cfif>

上面的代码应该转换为cfscript，我到此为止，但无法弄清楚如何访问列值。

<cfscript>
    public string function permissionList(required string AccountID) {
        local.fnResults = "";
        local.permissionList = "";

        try{
            local.qryPermissions = new Query();
            local.qryPermissions.setDatasource("#Application.dsn#");
            local.qryPermissions.setSQL("SELECT AccessType, AccessLevel, State, City, Building FROM Permissions WHERE AccountID = :AccountID");
            local.qryPermissions.addParam(name="AccountID",value="#trim(arguments.AccountID)#",cfsqltype="cf_sql_idstamp");
            local.qryRes = qryPermissions.execute();

            for ( i = 1 ; i <= qryRes.getResult().recordCount ; i++ ) {
                if(qryRes["AccessLevel"][i] EQ "S"){
                    local.permissionList = "";
                }else if(qryRes["AccessLevel"][i] EQ "S"){
                    local.permissionList = ListRemoveDuplicates(ValueList(qryRes.Agency,","));
                }else if(qryRes["AccessLevel"][i] EQ "C"){
                    local.permissionList = ListRemoveDuplicates(ValueList(qryRes.District,","));
                }else if(qryRes["AccessLevel"][i] EQ "B"){
                    local.permissionList = ListRemoveDuplicates(ValueList(qryRes.Building,","));
                }
            }

            local.fnResults = permissionList;
        }catch(any e){
            local.fnResults = e.message;
            //writeOutput(e.message);    
        }

        return fnResults;
    }

    writeOutput(permissionList(AccountID));
</cfscript>

如果有人可以帮助，请告诉我。

Answer 1

（来自评论...）

问题是local.qryRes实际上不包含查询对象。令人困惑的是，调用execute（）不会返回查询，但是调用execute（）。getResult（）会返回查询。尝试从以下位置更改分配：

local.qryRes = qryPermissions.execute();

收件人：

local.qryRes = qryPermissions.execute().getResult();

其他一些观察结果：

local 作用域内所有函数变量（包括循环索引i）很重要。否则，如果组件存储在共享作用域中，则可能会得到一些奇怪且不可预测的结果。

尽管我认为不需要循环，但如果要循环，请考虑使用更简单的for..in语法，而不是索引循环：

for (local.row in local.qryPermissions ) {
    if (local.row.AccessType eq "S") {
        //... code here 
    }
    .... 
}

由于访问字段是如此紧密地相关，所以我可能会让该函数返回一个包含所有三个键（AccessType，AccessLevel，PermissionList）的结构，而不是具有三个单独的函数。
考虑使用其他线程中的一项建议，而不是使用循环， Best way to store permissions for the user account?

Answer 2

您也可以使用：

local.qryPermissions = queryExecute(
        "SELECT AccessType, AccessLevel, State, City, Building
        FROM Permissions 
        WHERE AccountID = :AccountID" ,
        {AccountID={value="#trim(arguments.AccountID)#", cfsqltype="cf_sql_idstamp"}}  // Or "?" and "[value=xxx,cfsqltype=xxx]"
    ) ;

然后构建没有循环的权限块：

  local.permissionType = qryPermissions.AccessType ;
  local.permissionLevel = qryPermissions.AccessLevel ;

  switch( qryPermissions.AccessLevel ) {
    case "S" :  local.permissionList = qryPermissions.State ;
      break ;
    case "C" :  local.permissionList = ListRemoveDuplicates(ValueList(qryPermissions.City)) ;
      break ;
    case "B" :  local.permissionList = ListRemoveDuplicates(ValueList(qryPermissions.Building)) ;
      break ;
  }

另请参阅我关于另一个可能产生无意，半相关数据的问题的注释。

如何比较cfscript中的列值？

2 个答案: