Verify support for H2 database aliases in SQL scripts

This commit introduces a test to demonstrate how to define an alias in
an SQL script executed against an embedded H2 database.

Issue: SPR-15896

spring-jdbc/src/test/java/org/springframework/jdbc/datasource/init/AbstractDatabasePopulatorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,7 @@ import static org.mockito.Mockito.*;
  */
 public abstract class AbstractDatabasePopulatorTests extends AbstractDatabaseInitializationTests {
 
-	private final ResourceDatabasePopulator databasePopulator = new ResourceDatabasePopulator();
+	protected final ResourceDatabasePopulator databasePopulator = new ResourceDatabasePopulator();
 
 
 	@Test

spring-jdbc/src/test/java/org/springframework/jdbc/datasource/init/H2DatabasePopulatorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,12 @@
 
 package org.springframework.jdbc.datasource.init;
 
+import org.junit.Test;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
 
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
 /**
  * @author Sam Brannen
  * @since 4.0.3
@@ -28,4 +32,22 @@ public class H2DatabasePopulatorTests extends AbstractDatabasePopulatorTests {
 		return EmbeddedDatabaseType.H2;
 	}
 
+	/**
+	 * https://jira.spring.io/browse/SPR-15896
+	 *
+	 * @since 5.0
+	 */
+	@Test
+	public void scriptWithH2Alias() throws Exception {
+		databasePopulator.addScript(usersSchema());
+		databasePopulator.addScript(resource("db-test-data-h2-alias.sql"));
+		// Set statement separator to double newline so that ";" is not
+		// considered a statement separator within the source code of the
+		// aliased function 'REVERSE'.
+		databasePopulator.setSeparator("\n\n");
+		DatabasePopulatorUtils.execute(databasePopulator, db);
+		String sql = "select REVERSE(first_name) from users where last_name='Brannen'";
+		assertThat(jdbcTemplate.queryForObject(sql, String.class), equalTo("maS"));
+	}
+
 }

spring-jdbc/src/test/resources/org/springframework/jdbc/datasource/init/db-test-data-h2-alias.sql

@@ -0,0 +1,10 @@
+DROP ALIAS IF EXISTS REVERSE;
+
+-- REVERSE function borrowed from http://www.h2database.com/html/grammar.html#create_alias
+CREATE ALIAS REVERSE AS $$
+	String reverse(String s) {
+		return new StringBuilder(s).reverse().toString();
+	}
+$$;
+
+INSERT INTO users(first_name, last_name) values('Sam', 'Brannen');