Question

我正在尝试使用条件elsif，其中需要使用类似解码的内容，以便条件为真并进行插入。我在一个程序和条件就是这样做

elsif ((v_DIVIDEND/Divisor)-1 < ABS(0.2)) then 
    insert into table(Divisor,b,c) values(Dividend,y,z);

当除数不为零时它工作正常但是当除数为零时它失败。我想在elsif或类似解码之类的情况下使用另一个嵌套if条件来排除除数中的零。我尝试了另一个if，但语法似乎错了。使用Decode表示它只能在SQL语句中使用。有任何建议，请...

Answer 1

好吧，根据你想要得到的结果，当divisor = 0时（即大或某些小），你可以使用这样的东西：< / p>

对于小结果（除以1E99）：

case when divisor = 0 then 1E99 else divisor end

对于大的结果（除以1E-99）

case when divisor = 0 then 1E-99 else divisor end

由于您无法使用DECODE：这是正确的，它只能在SELECT语句中使用。这意味着您应该重写代码并将所有内容放入SELECT（这可能是一个坏主意）。所以 - 试试CASE。

Answer 2

也许您可以添加这样的条件来检查org.ow2.authzforce.core.pdp.api.IndeterminateEvaluationException: Function urn:oasis:names:tc:xacml:1.0:function:integer-equal: indeterminate arg at org.ow2.authzforce.core.pdp.api.func.BaseFirstOrderFunctionCall$EagerSinglePrimitiveTypeEval.evaluate(BaseFirstOrderFunctionCall.java:662) at org.ow2.authzforce.core.pdp.api.func.BaseFirstOrderFunctionCall.evaluate(BaseFirstOrderFunctionCall.java:359) at org.ow2.authzforce.core.pdp.impl.expression.ApplyExpressions$VariableApplyExpression.evaluate(ApplyExpressions.java:87) at org.ow2.authzforce.core.pdp.impl.rule.ConditionEvaluators$BooleanExpressionEvaluator.evaluate(ConditionEvaluators.java:94) at org.ow2.authzforce.core.pdp.impl.rule.RuleEvaluator.evaluate(RuleEvaluator.java:535) at org.ow2.authzforce.core.pdp.impl.combining.CombiningAlgEvaluators$RulesWithSameEffectEvaluator.evaluate(CombiningAlgEvaluators.java:134) at org.ow2.authzforce.core.pdp.impl.policy.PolicyEvaluators$BaseTopLevelPolicyElementEvaluator.evaluate(PolicyEvaluators.java:764) at org.ow2.authzforce.core.pdp.impl.policy.PolicyEvaluators$BaseTopLevelPolicyElementEvaluator.evaluate(PolicyEvaluators.java:881) at org.ow2.authzforce.core.pdp.impl.policy.RootPolicyEvaluators$StaticView.findAndEvaluate(RootPolicyEvaluators.java:190) at org.ow2.authzforce.core.pdp.impl.BasePdpEngine$IndividualDecisionRequestEvaluator.evaluateInNewContext(BasePdpEngine.java:685) at org.ow2.authzforce.core.pdp.impl.BasePdpEngine$NonCachingIndividualDecisionRequestEvaluator.evaluate(BasePdpEngine.java:730) at org.ow2.authzforce.core.pdp.impl.BasePdpEngine.evaluate(BasePdpEngine.java:984) at org.ow2.authzforce.core.pdp.api.io.BasePdpEngineAdapter.evaluate(BasePdpEngineAdapter.java:128) at org.ow2.authzforce.core.pdp.api.io.BasePdpEngineAdapter.evaluate(BasePdpEngineAdapter.java:149) at XACMLTester.main(XACMLTester.java:29) Caused by: org.ow2.authzforce.core.pdp.api.IndeterminateEvaluationException: Indeterminate arg #0 at org.ow2.authzforce.core.pdp.api.func.BaseFirstOrderFunctionCall.evalPrimitiveArgs(BaseFirstOrderFunctionCall.java:94) at org.ow2.authzforce.core.pdp.api.func.BaseFirstOrderFunctionCall.access$200(BaseFirstOrderFunctionCall.java:53) at org.ow2.authzforce.core.pdp.api.func.BaseFirstOrderFunctionCall$EagerSinglePrimitiveTypeEval.evaluate(BaseFirstOrderFunctionCall.java:658) ... 14 more Caused by: org.ow2.authzforce.core.pdp.api.IndeterminateEvaluationException: Function urn:oasis:names:tc:xacml:1.0:function:integer-one-and-only: Invalid arg #0: empty bag or bag size > 1. Required: one and only one value in bag. at org.ow2.authzforce.core.pdp.api.func.FirstOrderBagFunctions$SingletonBagToPrimitive.<init>(FirstOrderBagFunctions.java:82) at org.ow2.authzforce.core.pdp.api.func.FirstOrderBagFunctions.getFunctions(FirstOrderBagFunctions.java:554) at org.ow2.authzforce.core.pdp.impl.func.StandardFunction.getRegistry(StandardFunction.java:901) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.<init>(PdpEngineConfiguration.java:286) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.getInstance(PdpEngineConfiguration.java:479) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.getInstance(PdpEngineConfiguration.java:519) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.getInstance(PdpEngineConfiguration.java:551) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.getInstance(PdpEngineConfiguration.java:687) at org.ow2.authzforce.core.pdp.impl.PdpEngineConfiguration.getInstance(PdpEngineConfiguration.java:704) at XACMLTester.main(XACMLTester.java:23)是否为零。

Divisor

Answer 3

您可以尝试nullif：

declare 
    divisor constant integer := 0;
    result number;
begin
    result := 100 / nullif(divisor,0);
end;

如果divisor的值为0，则result替换为null，将<Directory>设为空。

Answer 4

你也可以处理“divisor equal to zero”异常并在发生错误时进行插入，参见处理“divisor equal to zero”异常的示例代码，

示例1：此示例定义了divisor_equal_to_zero异常

DECLARE
    divisor_equal_to_zero EXCEPTION;
    PRAGMA EXCEPTION_INIT(divisor_equal_to_zero, -1476);
    v_divisor NUMBER := 0;
    v_quotient NUMBER;
BEGIN
    v_quotient := 1/v_divisor;
    DBMS_OUTPUT.PUT_LINE('Print A: '||v_quotient);
EXCEPTION
    WHEN divisor_equal_to_zero THEN
        v_divisor := 1;
        v_quotient := 1/v_divisor;
        DBMS_OUTPUT.PUT_LINE('Print B: '||v_quotient);
        --you can put the insert statement here
END;
/

示例2：此示例使用预定义的ZERO_DIVIDE异常

DECLARE
    v_divisor NUMBER := 0;
    v_quotient NUMBER;
BEGIN
    v_quotient := 1/v_divisor;
    DBMS_OUTPUT.PUT_LINE('Print A: '||v_quotient);
EXCEPTION
    WHEN ZERO_DIVIDE THEN
        v_divisor := 1;
        v_quotient := 1/v_divisor;
        DBMS_OUTPUT.PUT_LINE('Print B: '||v_quotient);
        --you can put the insert statement here
END;
/

替换为DECODE，就像在PLSQL过程中的elsif语句中使用的函数一样

4 个答案: