在DataStage中嵌套If-Then-Else用法

Question

我试图在DataStage的转换阶段编写以下嵌套的If-Then-else语句，但它给了我编译错误。谁能告诉我还有别的方法吗?

If IsNotNull(DSLink16.DECISION_ID) 
Then (
    If DSLink16.DECISION_RESULT = 1 Then (
        If DSLink16.DECISION_CODE = 'ALOW' Then 'DENY'
        Else If DSLink16.DECISION_CODE = 'DENY' Then 'ALOW'
        Else If DSLink16.DECISION_CODE = 'NOIS' Then 'NOIS'
    )
    Else If DSLink16.DECISION_RESULT = 2 Then 'DSMS'
    Else If DSLink16.DECISION_RESULT = 3 Then (
        If APPELANT_CODE = 'CLMT' Then 'ALOW' Else 'DENY'
    )
    Else If DSLink16.DECISION_RESULT = 4 Then (
        If APPELANT_CODE = 'CLMT' Then 'DENY' Else 'ALOW'
    )
    Else If DSLink16.DECISION_RESULT = 5 Then DSLink16.DECISION_CODE
    Else If DSLink16.DECISION_RESULT = 6 or DSLink16.DECISION_RESULT = 7 or DSLink16.DECISION_RESULT = 8 Then 'DENY'
)
Else (
    If DSLink16.DECISION_RESULT = 1 Then 'DENY'
    Else If DSLink16.DECISION_RESULT = 2 Then 'DENY'
    Else If DSLink16.DECISION_RESULT = 3 Then 'ALOW'
    Else If DSLink16.DECISION_RESULT = 4 Then 'DENY'
    Else If DSLink16.DECISION_RESULT = 5 Then 'ALOW'
    Else If DSLink16.DECISION_RESULT = 6 Then 'DENY'
    Else If DSLink16.DECISION_RESULT = 7 Then 'DENY'
    Else If DSLink16.DECISION_RESULT = 8 Then 'DENY'
)

Answer 1

似乎每个If都应该有相应的Else块与之关联。

If IsNotNull(DSLink16.DECISION_ID) 
Then (
              If DSLink16.DECISION_RESULT = 1 Then (
                                If DSLink16.DECISION_CODE = 'ALOW' Then 'DENY'
                               ELSE If DSLink16.DECISION_CODE = 'DENY' Then 'ALOW'
                               ELSE 'NOIS' 
                )   ELSE If DSLink16.DECISION_RESULT = 2 Then 'DSMS'   ELSE If DSLink16.DECISION_RESULT = 3 Then (
                                If DSLink16.APPELANT_CODE = 'CLMT' then 'ALOW' Else 'DENY'
                )   ELSE If DSLink16.DECISION_RESULT = 4 Then (
                                If DSLink16.APPELANT_CODE = 'CLMT' Then 'DENY' Else 'ALOW'
                )  ELSE If DSLink16.DECISION_RESULT = 5 Then DSLink16.DECISION_CODE
              ELSE   'DENY' 
)
Else (
            If DSLink16.DECISION_RESULT = 1 Then 'DENY' 
                ELSE If DSLink16.DECISION_RESULT = 2 Then 'DENY' 
                ELSE If DSLink16.DECISION_RESULT = 3 Then 'ALOW' 
                ELSE If DSLink16.DECISION_RESULT = 4 Then 'DENY' 
                ELSE If DSLink16.DECISION_RESULT = 5 Then 'ALOW' 
                ELSE If DSLink16.DECISION_RESULT = 6 Then 'DENY' 
                ELSE If DSLink16.DECISION_RESULT = 7 Then 'DENY' 
                ELSE If DSLink16.DECISION_RESULT = 8 Then 'DENY'
                                                                ELSE 'DENY'                )

Answer 2

假设DECISION_RESULT是某种整数，则可以写入最后的块:

If DSLink16.DECISION_RESULT = 3 Or DSLink16.DECISION_RESULT = 5
Then "ALOW" Else "DENY"