Question

我想创建一个动态查询以获取表数据。使用此动态查询，我们需要选择所有列或所需的列。需要动态加入，条件也要加入。

Answer 1

我们可以在Coldfusion中创建一个动态SELECT查询。下面我添加了一个CFC函数，它具有动态查询。请检查一下。

<cffunction name="select" access="public" returntype="Query">
        <cfargument name="tableName" type="string" required="true">
        <cfargument name="joinType" type="array" required="false">
        <cfargument name="conditionType" type="array" required="false">
        <cfargument name="subQuery" type="array" required="false">
        <cfargument name="orderBy" type="string" required="false">
        <cfargument name="groupBy" type="string" required="false">
        <cfargument name="neededColumns" type="string" required="false">

        <cfquery name="selectQ">
            SELECT
                <cfif len(arguments.neededColumns)>
                    #arguments.neededColumns#
                <cfelse>
                    *
                </cfif>
                <cfif structKeyExists(arguments, "subQuery")>
                    <cfloop array="#arguments.subQuery#" index="i">
                        ,#PreserveSingleQuotes(i)#
                    </cfloop>
                </cfif>
            FROM
                #arguments.tableName#
                <cfif structKeyExists(arguments, "joinType") AND !ArrayIsEmpty(arguments.joinType)>
                    <cfloop array="#arguments.joinType#" index="i">
                        #i.type# JOIN #i.table# #i.alias# ON #i.primaryColumn# = #i.alias#.#i.secondaryColumn#
                    </cfloop>
                </cfif>
            WHERE 1=1
                <cfif structKeyExists(arguments, "conditionType") AND !ArrayIsEmpty(arguments.conditionType)>
                    <cfloop array="#arguments.conditionType#" index="i">
                        AND #i.column#
                        <cfif structKeyExists(i, "symbol")>
                            #i.symbol#
                        <cfelse>
                            =
                        </cfif>
                        <cfif isNumeric(i.value)>
                            <cfqueryparam value="#i.value#" cfsqltype="cf_sql_numeric">
                        <cfelseif isDate(i.value)>
                            <cfqueryparam value="#i.value#" cfsqltype="cf_sql_timestamp">
                        <cfelse>
                            <cfqueryparam value="#i.value#" cfsqltype="cf_sql_varchar">
                        </cfif>
                    </cfloop>
                </cfif>
                <cfif structKeyExists(arguments, "groupBy") AND len(arguments.groupBy)>
                    GROUP BY #arguments.groupBy#
                </cfif>
                <cfif structKeyExists(arguments, "orderBy") AND len(arguments.orderBy)>
                    #arguments.orderBy#
                </cfif>
        </cfquery>
        <cfreturn selectQ>
    </cffunction>

下面的代码说明了如何调用上述函数以及如何将参数发送给该函数。

<cfset getAllDatas = application.base.get(
        tableName = "Users U",
        joinType = [
          {"table" : "customers", "type" : "INNER", "alias" : "C", "primaryColumn" : "U.user_id" , "secondaryColumn" : "userid"},
          {"table" : "customerType", "type" : "INNER", "alias" : "CT", "primaryColumn" : "C.eventid" , "secondaryColumn" : "eventid"}
        ],
        subQuery = [
          "(SELECT COUNT(*) FROM Participants WHERE UserID = #session.UserID# AND status = 'attended') AS count"
        ],
        orderBy  = " ORDER BY C.CreatedDate DESC",
        groupBy  = "C.CreatedDate",
        conditionType = [
          { "column" : "UserID", "value" : session.userID},
          { "column" : "C.status", "value" : "Attended"}
        ]
 )/>

伙计们，如果您有任何想法，请与我分享。

谢谢！

创建单个动态查询以基于Coldfusion中的funcion调用获取表数据

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