Question

我正在尝试连接保留的值。这是我的一段代码：

data &_output.;
set &_input.;
by cpn;
retain json_array;
if first.cpn and last.cpn then do;
   flag = 'both';
   concat = ('subscriptions:[{'||'"mpc" : "'||compress(mpc)||'" ,    '||'"contract_start_date" : "'||compress(contract_start_date)||'" '||' , "contract_end_date" : "'||compress(contract_end_date)||'"'||' , "subscription_status_code" : "'||compress(subscription_status_code)||'"'||' , '||'"promo_code" : "'||compress(promo_code)||'" '||' , "print_or_digi_flag" : "'||compress(print_or_digi_flag)||'"'||' , "payment_method_selection" : "'||compress(payment_method_selection)||'"'||', "subscription_type_code" : "'||compress(subscription_type_code)||'"'||' , "report_trial_subscription" : "'||compress(report_trial_subscription)||'"'||' , "product_desc" : "'||compress(product_desc)||'"}]');
end;
else if first.cpn then do;
    flag = 'first';
    concat = ('subscriptions:[{'||'"mpc" : "'||compress(mpc)||'" , '||'"contract_start_date" : "'||compress(contract_start_date)||'" '||' , "contract_end_date" : "'||compress(contract_end_date)||'"'||' , "subscription_status_code" : "'||compress(subscription_status_code)||'"'||' , '||'"promo_code" : "'||compress(promo_code)||'" '||' , "print_or_digi_flag" : "'||compress(print_or_digi_flag)||'"'||' , "payment_method_selection" : "'||compress(payment_method_selection)||'"'||', "subscription_type_code" : "'||compress(subscription_type_code)||'"'||' , "report_trial_subscription" : "'||compress(report_trial_subscription)||'"'||' , "product_desc" : "'||compress(product_desc)||'"} , ');
end;
else if last.cpn then do;
    flag = 'last';
    concat = ('{"mpc" : "'||compress(mpc)||'" , '||'"contract_start_date" : "'||compress(contract_start_date)||'" '||' , "contract_end_date" : "'||compress(contract_end_date)||'"'||' , "subscription_status_code" : "'||compress(subscription_status_code)||'"'||' , '||'"promo_code" : "'||compress(promo_code)||'" '||' , "print_or_digi_flag" : "'||compress(print_or_digi_flag)||'"'||' , "payment_method_selection" : "'||compress(payment_method_selection)||'"'||', "subscription_type_code" : "'||compress(subscription_type_code)||'"'||' , "report_trial_subscription" : "'||compress(report_trial_subscription)||'"'||' , "product_desc" : "'||compress(product_desc)||'"  }]');
end;
else if not  first.cpn and not last.cpn then do;
    flag = 'none';
    concat = trim(('{"mpc" : "'||compress(mpc)||'" , '||'"contract_start_date" : "'||compress(contract_start_date)||'" '||' , "contract_end_date" : "'||compress(contract_end_date)||'"'||' , "subscription_status_code" : "'||compress(subscription_status_code)||'"'||' , '||'"promo_code" : "'||compress(promo_code)||'" '||' , "print_or_digi_flag" : "'||compress(print_or_digi_flag)||'"'||' , "payment_method_selection" : "'||compress(payment_method_selection)||'"'||', "subscription_type_code" : "'||compress(subscription_type_code)||'"'||' , "report_trial_subscription" : "'||compress(report_trial_subscription)||'"'||' , "product_desc" : "'||compress(product_desc)||'"} , '));
end;
if first.cpn then json_array = trim(concat);
   else json_array = trim(json_array)||trim(concat);
run;

例如，如果cpn有4条记录，并且json_array的长度在第三条记录上达到955 - 这是修剪值的地方，这是该cpn的json_array的最终结果。 json_array和amp; concat设置为10,000个职位。为什么要修剪？

提前谢谢。

Answer 1

来自TRIM上的SAS文档（）（https://support.sas.com/documentation/cdl/en/lefunctionsref/67960/HTML/default/viewer.htm#n1io938ofitwnzn18e1hzel3u9ut.htm）

在DATA步骤中，如果TRIM函数向先前未分配长度的变量返回值，则该变量将被赋予参数的长度。

如果未明确设置JSON_ARRAY的大小，则其长度为CONCAT。如果您未设置CONCAT的长度，那么它将是首次分配的长度（在本例中为955）。

所以添加FORMAT或LENGTH语句并设置JSON_ARRAY（你也应该CONCAT），你应该好好去。

SAS：为什么字符串在955位被修剪

1 个答案: