Create caseWhenTest.gsql

demos/guru_scripts/docker/tutorial/4.x/script/caseWhenTest.gsql

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+USE GRAPH financialGraph
+CREATE OR REPLACE QUERY CaseWhenTest () SYNTAX V3{
+
+  SumAccum<INT> @@isBlocked;
+  SumAccum<INT> @@unBlocked;
+  SumAccum<INT> @@others;
+
+  SumAccum<INT> @@isBlocked2;
+  SumAccum<INT> @@unBlocked2;
+  SumAccum<INT> @@others2;
+
+
+  //case-when in a query block
+  S1 = SELECT a
+       FROM (a:Account)
+       ACCUM
+          //if-else semantic: within query block, statement
+          //does not need a semicolon to end.
+          CASE
+            WHEN a.isBlocked THEN @@isBlocked += 1
+            WHEN NOT a.isBlocked THEN @@unBlocked += 1
+            ELSE  @@others += 1
+          END;
+
+
+  PRINT @@isBlocked, @@unBlocked, @@others;
+
+  S2 = SELECT a
+       FROM (a:Account)
+       ACCUM
+          //switch semantic: within query block, statement
+          //does not need a semicolon to end.
+          CASE a.isBlocked
+            WHEN TRUE THEN @@isBlocked2 += 1
+            WHEN FALSE THEN @@unBlocked2 += 1
+            ELSE  @@others2 += 1
+          END;
+
+  PRINT @@isBlocked2, @@unBlocked2, @@others2;
+
+  STRING drink = "Juice";
+  SumAccum<INT> @@calories = 0;
+
+ //if-else version. Top-statement level. Each statement
+ //needs to end by a semicolon, including the “END”.
+  CASE
+    WHEN drink == "Juice" THEN @@calories += 50;
+    WHEN drink == "Soda"  THEN @@calories += 120;
+    ELSE @@calories = 0;       // Optional else-clause
+  END;
+  // Since drink = "Juice", 50 will be added to calories
+
+  //switch version. Top-statement level. Each statement
+  //needs to end by a semicolon, including the “END”.
+  CASE drink
+    WHEN "Juice" THEN @@calories += 50;
+    WHEN "Soda"  THEN @@calories += 120;
+    ELSE  @@calories = 0;    // Optional else-clause
+  END;
+
+  PRINT @@calories;
+}
+
+INSTALL QUERY CaseWhenTest
+
+RUN QUERY CaseWhenTest()