test: Call say_hello function for test

examples/booktest/postgresql/db_test.go

@@ -150,7 +150,18 @@ func TestBooks(t *testing.T) {
 		t.Logf("Book %d: '%s', Author: '%s', ISBN: '%s' Tags: '%v'\n", ab.BookID, ab.Title, ab.Name.String, ab.Isbn, ab.Tags)
 	}
 
-	// TODO: call say_hello(varchar)
+	// call function
+	pgText, err := dq.SayHello(ctx, "world")
+	if err != nil {
+		t.Fatal(err)
+	}
+	str, err := pgText.Value()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if str != "hello world" {
+		t.Fatal("expected function result to be \"hello world\". actual:", str)
+	}
 
 	// get book 4 and delete
 	b5, err := dq.GetBook(ctx, b3.BookID)

examples/booktest/postgresql/query.sql

@@ -58,3 +58,6 @@ WHERE book_id = $3;
 UPDATE books
 SET title = $1, tags = $2, isbn = $4
 WHERE book_id = $3;
+
+-- name: SayHello :one
+select * from say_hello($1);

examples/booktest/postgresql/schema.sql

@@ -23,9 +23,9 @@ CREATE TABLE books (
 
 CREATE INDEX books_title_idx ON books(title, year);
 
-CREATE FUNCTION say_hello(text) RETURNS text AS $$
+CREATE FUNCTION say_hello(s text) RETURNS text AS $$
 BEGIN
-          RETURN CONCAT('hello ', $1);
+          RETURN CONCAT('hello ', s);
 END;
 $$ LANGUAGE plpgsql;