dynamic parameters example

h2/src/test/org/h2/test/db/TestFunctions.java

@@ -48,6 +48,7 @@ public class TestFunctions extends TestBase implements AggregateFunction {
 
     public void test() throws Exception {
         deleteDb("functions");
+        testDynamicArgumentAndReturn();
         testUUID();
         testDeterministic();
         testTransactionId();
@@ -59,6 +60,20 @@ public class TestFunctions extends TestBase implements AggregateFunction {
         deleteDb("functions");
     }
 
+    private void testDynamicArgumentAndReturn() throws SQLException {
+        Connection conn = getConnection("functions");
+        Statement stat = conn.createStatement();
+        ResultSet rs;
+        stat.execute("create alias dynamic deterministic for \"" + getClass().getName() + ".dynamic\"");
+        setCount(0);
+        rs = stat.executeQuery("call dynamic(('a', 1))[0]");
+        rs.next();
+        String a = rs.getString(1);
+        assertEquals("a1", a);
+        stat.execute("drop alias dynamic");
+        conn.close();
+    }
+
     private void testUUID() throws SQLException {
         Connection conn = getConnection("functions");
         Statement stat = conn.createStatement();
@@ -656,6 +671,20 @@ public class TestFunctions extends TestBase implements AggregateFunction {
                 a.getLeastSignificantBits() ^ b.getLeastSignificantBits());
     }
 
+    /**
+     * This method is called via reflection from the database.
+     *
+     * @param args the argument list
+     * @return an array of one element
+     */
+    public static Object[] dynamic(Object[] args) {
+        StringBuilder buff = new StringBuilder();
+        for (Object a : args) {
+            buff.append(a);
+        }
+        return new Object[] { buff.toString() };
+    }
+
     public void add(Object value) {
         // ignore
     }