Dataweave, 生成一个csv文件时，如何去除多余的\n？

Question

我正在生成一个csv文件，准备发送到一个SFTP的位置，这个文件是按照预期创建的，除了额外的/nis有什么办法可以去除它？

输入。

[
    {
        "reference": "TPL",
        "newId": "07223455",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "TIN",
        "newId": "07123455",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "THW",
        "newId": "05550910",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "THW",
        "newId": "05533112",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "TSB",
        "newId": "05567865",
        "dateCreated": "020200509",
        "error": "000"
    }
]

Dataweave。

%dw 2.0
output application/csv header = false
import * from dw::core::Strings
---
payload filter ( $.error == '000' ) map (
    values:
       rightPad($.reference, 16)
    ++ rightPad('0', 1)
    ++ rightPad($.newId, 9)
    ++ rightPad('0', 1)
    ++ rightPad($.dateCreated,9)
    ++ rightPad("", 16)
    ++ rightPad("P",1)
    ++ rightPad("", 103)
 ) 

结果：

TPL             07223455  020200509                 P                                                                                                       
TIN             07123455  020200509                 P                                                                                                       
THW             05550910  020200509                 P                                                                                                       
THW             05533112  020200509                 P                                                                                                       
TSB             05567865  020200709                 P                                                                                                       
TSB             05533112  020200509                 P                                                                                                       

我尝试删除最后一行

result[0 to sizeOf(result) -1]

但每行末尾都默认添加了"\n"。

Answer 1

你可能想试试这个。

%dw 2.0
output application/flatfile schemaPath="schema.ffd"
var data = [
    {
        "reference": "TPL",
        "newId": "07223455",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "TIN",
        "newId": "07123455",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "THW",
        "newId": "05550910",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "THW",
        "newId": "05533112",
        "dateCreated": "020200509",
        "error": "000"
    },
    {
        "reference": "TSB",
        "newId": "05567865",
        "dateCreated": "020200509",
        "error": "000"
    }
]
---
data map {($ - "error"), p: "P"}

你必须在你的classpath下创建一个文件(我是在你的classpath下创建的) src/main/resources)，包含模式，我把它称为 schema.ffd 你可以看到下面的内容。

form: FIXEDWIDTH
name: my-flat-file
values:
- { name: 'reference', type: String, length: 16 }
- { name: 'newId', type: String, length: 10 }
- { name: 'dateCreated', type: String, length: 25 }
- { name: 'p', type: String, length: 104 }

我得到了以下的输出。

TPL             07223455  020200509                P                                                                                                       
TIN             07123455  020200509                P                                                                                                       
THW             05550910  020200509                P                                                                                                       
THW             05533112  020200509                P                                                                                                       
TSB             05567865  020200509                P                                                                                                       

Answer 2

你可以一直这样做。

%dw 2.0
output text/plain
import * from dw::core::Strings
---
write(payload filter ( $.error == '000' ) map (
    values:
       rightPad($.reference, 16)
    ++ rightPad('0', 1)
    ++ rightPad($.newId, 9)
    ++ rightPad('0', 1)
    ++ rightPad($.dateCreated,9)
    ++ rightPad("", 16)
    ++ rightPad("P",1)
    ++ rightPad("", 103)
 ), "application/csv", { header: false})[0 to -2]

编辑包括关闭头部。