Question

我正在使用for循环在我的控制器中迭代上传的CSV文件。如果我的任何记录包含错误，我需要能够在GSP中显示整个错误列表而不保存任何记录。如果没有错误，请保存整批记录。

我正在努力学习如何做到这一点。您是否迭代CSV文件两次，第一次查找错误，第二次处理数据库提交？我是否创建了错误列表并将其作为flash.message发回？

我的代码

public class MainActivity extends Activity {

    Button b_bleu;
    PrgressBar bar1;

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        b_bleu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            ObjectAnimator animation = ObjectAnimator.ofInt(bar1, "progress", 100, 0);
            animation.setDuration(5000);
            animation.addListener(new Animator.AnimatorListener() {
                @Override
                public void onAnimationStart(Animator animator) {

                }

                @Override
                public void onAnimationEnd(Animator animator) {
                    //application se termine
                }

                @Override
                public void onAnimationCancel(Animator animator) {

                }

                @Override
                public void onAnimationRepeat(Animator animator) {

                }
            });

            animation.cancel();
            animation.start();
        }
    });  
}

.gsp

def uploadFile() {
    CsvToBean<EffortDetail> csvToBean = new CsvToBean<>();

    Map<String, String> columnMapping = new HashMap<String, String>();
    columnMapping.put("ExternalID", "alternateId");
    columnMapping.put("Full Name", "fullName");
    columnMapping.put("OrgKey", "orgkey");
    columnMapping.put("expenseDate", "expenseDate");
    columnMapping.put("projectHours", "projectHours");
    columnMapping.put("totalHours", "totalHours");

    HeaderColumnNameTranslateMappingStrategy<EffortDetail> strategy = new HeaderColumnNameTranslateMappingStrategy<EffortDetail>();
    strategy.setType(EffortDetail.class);
    strategy.setColumnMapping(columnMapping);

    MultipartFile file = request.getFile('file');

    if(file.empty) {
        flash.message = "File cannot be empty"
    } else {
        List<EffortDetail> effortDetails = null;
        CSVReader reader = new CSVReader(new InputStreamReader(file.getInputStream()));
        effortDetails = csvToBean.parse(strategy, reader);

        int count = 0;

        //iterate for errors
        for(EffortDetail effortDetail : effortDetails) {
            println "loop 1 " + count++

            def recoveryDetailInstance = recoveryDetailService.populate(effortDetail)
            // Test code to try and throw a list of flash messages
            flash.message = count++;
        }

        count = 0;

        //Iterate for commit
        for(EffortDetail effortDetail : effortDetails) {
            println "loop 2 " + count++

            def recoveryDetailInstance = recoveryDetailService.populate(effortDetail)
            recoveryDetailInstance.save(flush:true,failOnError:true)
        }
    }

    redirect (action:'upload')
}

Answer 1

您需要查看交易。这是另一个Stackoverflow线程，我相信它正是您正在寻找的。

Grails - Saving multiple object, Rollback all object if one fails to save

TLDR是将处理逻辑从控制器移动到Service类方法。然后将您的循环组合成一个循环，同时执行验证和域保存。如果出现任何错误，您可以在调用回滚后返回失败的域对象列表。

控制器for循环中的Grails错误处理

1 个答案: