javascript barcode scanner mobile 10: Single-Row and Conversion Functions in Software

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10: Single-Row and Conversion Functions
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The DECODE Function
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The DECODE function implements if-then-else conditional logic by testing its first two terms for equality and returns the third if they are equal and optionally returns another term if they are not The DECODE function takes at least three mandatory parameters, but it can take many more The syntax of the function is DECODE(expr1, comp1, iftrue1, [comp2, iftrue2 [ compN, iftrueN]], [iffalse]) These parameters are evaluated as shown in the following pseudocode example:
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If expr1 = comp1 then return iftrue1 else if expr1 = comp2 then return iftrue2 else if expr1 = compN then return iftrueN else return null | iffalse;
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Here, expr1 is compared with comp1 If they are equal, then iftrue1 is returned If expr1 is not equal to comp1, then what happens next depends on whether the optional parameters comp2 and iftrue2 are present If they are, then expr1 is compared to comp2 If they are equal, then iftrue2 is returned If not, what happens next depends on whether further compn, iftrueN pairs exist, and the cycle continues until no comparison terms remain If no matches have been found and if the iffalse parameter is defined, then iffalse is returned If the iffalse parameter does not exist and no matches are found, a null is returned All parameters to the DECODE function may be expressions The return data type is the same as that of the first matching comparison item The expression expr1 is implicitly converted to the data type of the first comparison parameter comp1 As the other comparison parameters comp2 compn are evaluated, they too are implicitly converted to the same data type as comp1 DECODE considers two nulls to be equivalent, so if expr1 is null and comp3 is the first null comparison parameter encountered, then the corresponding result parameter iftrue3 is returned Consider the following queries: Query 1: select decode(1234, 123, '123 is a match') from dual; Query 2: select decode(1234, 123, '123 is a match', 'No match') from dual; Query 3: select decode('search', 'comp1', 'true1', 'comp2', 'true2', 'search', 'true3', substr( 2search , 2, 6), 'true4', 'false') from dual; Query 1 compares the number 1234 with the first comparison term 123 Since they are not equal, the first result term cannot be returned Further, as there is no default iffalse parameter defined, a null is returned Query 2 is identical to the first except that an iffalse parameter is defined Therefore, since 1234 is not equal to 123, the string No match is returned Query 3 searches through the comparison parameters for a match The strings comp1 and comp2 are not equal to search, so the results true1 and true2 are not returned A match is found in the third comparison term comp3 (parameter 6), which contains the string search Therefore, the third result term iftrue3 (parameter 7) containing the string true3 is returned Note that since a match has
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been found, no further searching takes place So, although the fourth comparison term (parameter 8) is also a match to expr1, this expression is never evaluated, because a match was found in an earlier comparison term
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The CASE Expression
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Virtually all third- and fourth-generation programming languages implement a case construct Like the DECODE function, the CASE expression facilitates if-then-else conditional logic There are two variants of the CASE expression The simple CASE expression lists the conditional search item once, and equality to the search item is tested by each comparison expression The searched CASE expression lists a separate condition for each comparison expression The CASE expression takes at least three mandatory parameters but can take many more Its syntax depends on whether a simple or a searched CASE expression is used The syntax for the simple CASE expression is as follows:
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CASE search_expr WHEN comparison_expr1 THEN iftrue1 [WHEN comparison_expr2 THEN iftrue2 WHEN comparison_exprN THEN iftrueN ELSE iffalse] END
The simple CASE expression is enclosed within a CASE END block and consists of at least one WHEN THEN statement In its simplest form, with one WHEN THEN statement, the search_expr is compared with the comparison_expr1 If they are equal, then the result iftrue1 is returned If not, a null value is returned unless an ELSE component is defined, in which case, the default iffalse value is returned When more than one WHEN THEN statement exists in the CASE expression, searching for a matching comparison expression continues until a match is found The search, comparison, and result parameters can be column values, expressions, or literals but must all be of the same data type Consider the following query:
select case substr(1234, 1, 3) when '134' then '1234 is a match' when '1235' then '1235 is a match' when concat('1', '23') then concat('1', '23')||' is a match' else 'no match' end from dual;
The search expression derived from the SUBSTR(1234, 1, 3) is the character string 123 The first WHEN THEN statement compares the string 134 with 123 Since they are not equal, the result expression is not evaluated The second WHEN THEN statement compares the string 1235 with 123 and, again, they are not equal The third WHEN THEN statement compares the results derived from the CONCAT('1','23') expression, which is 123, to the search expression Since they are identical, the third results expression, 123 is a match , is returned
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