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Multiples IFs statement

This pattern defines a function that uses conditional statements over local variables.

Components:

  1. Function Declaration:

    • CREATE FUNCTION functionName(parameters) RETURN returnType

    • Declares the function with input parameters and the return type.

  2. Variable Declaration:

    • Declares variables, including the return variable.

  3. BEGIN-END Block with IF Statement:

    • Check if a condition is true.

    • Each case is used to assign a value over the same variable.

Conversion:

DECLARE SECTION : variables with default an expression are moved to a common table expression.

IF/ELSE statement can be handled using the CASE EXPRESSION inside the select allowing conditionals inside the queries.

RETURN statement is transformed to the final select.

IN -> Oracle_01.sql
CREATE OR REPLACE FUNCTION Case1 (
   in_date_ IN DATE,
   min_max_ IN VARCHAR2 )
RETURN DATE
IS
   cond_date_  DATE := CURRENT_DATE;
BEGIN
   IF ( in_date_ IS NULL ) THEN
      IF ( min_max_ = 'MIN' ) THEN
         cond_date_ := FOO1();
      ELSE
         cond_date_ := FOO2();
      END IF;
   ELSE
      cond_date_ := TRUNC(in_date_);
   END IF;
   RETURN cond_date_;
END Case1;
IN -> Oracle_02.sql
CREATE OR REPLACE FUNCTION Case2 (
   year_        IN NUMBER,
   id           IN NUMBER) 
   RETURN VARCHAR2
IS
   base_value_        NUMBER;
   fully_depritiated_ VARCHAR2(5);
   residual_value_    NUMBER;
   acc_depr_prev_     NUMBER;
   acc_depr_          NUMBER;
BEGIN

   base_value_     := FOO1(year_, id);
   acc_depr_       := FOO2(year_, id);
   acc_depr_prev_  := FOO3(year_, id);
   residual_value_ := NVL(base_value_,0) -(acc_depr_ + acc_depr_prev_);

   IF (residual_value_=0 AND base_value_!=0) THEN
      fully_depritiated_ := 'TRUE';
   ELSE
      fully_depritiated_ := 'FALSE';
   END IF;

   RETURN fully_depritiated_;
END Case2;
IN -> Oracle_03.sql
CREATE OR REPLACE FUNCTION Case2_1 (
   year_        IN NUMBER,
   id           IN NUMBER) 
   RETURN VARCHAR2
IS
   base_value_        NUMBER;
   fully_depritiated_ VARCHAR2(5);
   residual_value_    NUMBER;
   acc_depr_prev_     NUMBER;
   acc_depr_          NUMBER;
BEGIN

   base_value_     := FOO1(year_, id);
   acc_depr_       := FOO2(year_, id);
   acc_depr_prev_  := FOO3(year_, id);
   residual_value_ := NVL(base_value_,0) -(acc_depr_ + acc_depr_prev_);

   IF (residual_value_=0 AND base_value_!=0) THEN
      fully_depritiated_ := 'TRUE';
   ELSE
      fully_depritiated_ := 'FALSE';
   END IF;

   fully_depritiated := fully_depritiated || ' CONCAT FOR TESTING';
   fully_depritiated := fully_depritiated || ' CONCAT FOR TESTING2';
   RETURN fully_depritiated_;
END Case2;
IN -> Oracle_04.sql
CREATE OR REPLACE FUNCTION Case2_1 (
   year_        IN NUMBER,
   id           IN NUMBER) 
   RETURN VARCHAR2
IS
   base_value_        NUMBER;
   fully_depritiated_ VARCHAR2(5);
   residual_value_    NUMBER;
   acc_depr_prev_     NUMBER;
   acc_depr_          NUMBER;
BEGIN

   base_value_     := FOO1(year_, id);
   acc_depr_       := FOO2(year_, id);
   acc_depr_prev_  := FOO3(year_, id);
   residual_value_ := NVL(base_value_,0) -(acc_depr_ + acc_depr_prev_);

   IF (residual_value_=0 AND base_value_!=0) THEN
      fully_depritiated_ := 'TRUE';
   ELSE
      fully_depritiated_ := 'FALSE';
   END IF;

   fully_depritiated := fully_depritiated || ' CONCAT FOR TESTING';
   fully_depritiated := fully_depritiated || ' CONCAT FOR TESTING2';
   RETURN fully_depritiated_;
END Case2;

Known Issues

No issues were found.

Related EWIS

  1. SSC-FDM-OR0042: Date Type Transformed To Timestamp Has A Different Behavior.

  2. SSC-EWI-0073: Pending Functional Equivalence Review.

  3. SSC-EWI-OR0036: Types resolution issues, the arithmetic operation may not behave correctly between string and date.

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