/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.test.db;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.h2.api.ErrorCode;
import org.h2.engine.Session;
import org.h2.jdbc.JdbcConnection;
import org.h2.test.TestBase;
/**
* Test for views.
*/
public class TestView extends TestBase {
private static int x;
/**
* Run just this test.
*
* @param a ignored
*/
public static void main(String... a) throws Exception {
TestBase.createCaller().init().test();
}
@Override
public void test() throws SQLException {
deleteDb("view");
testSubSubQuery();
testSubQueryViewIndexCache();
testInnerSelectWithRownum();
testInnerSelectWithRange();
testEmptyColumn();
testChangeSchemaSearchPath();
testParameterizedView();
testCache();
testCacheFunction(true);
testCacheFunction(false);
testInSelect();
testUnionReconnect();
testManyViews();
testReferenceView();
testViewAlterAndCommandCache();
testViewConstraintFromColumnExpression();
deleteDb("view");
}
private void testSubSubQuery() throws SQLException {
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("drop table test if exists");
stat.execute("create table test(a int, b int, c int)");
stat.execute("insert into test values(1, 1, 1)");
ResultSet rs = stat.executeQuery("select 1 x from (select a, b, c from " +
"(select * from test) bbb where bbb.a >=1 and bbb.a <= 1) sp " +
"where sp.a = 1 and sp.b = 1 and sp.c = 1");
assertTrue(rs.next());
conn.close();
}
private void testSubQueryViewIndexCache() throws SQLException {
if (config.networked) {
return;
}
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("drop table test if exists");
stat.execute("create table test(id int primary key, " +
"name varchar(25) unique, age int unique)");
// check that initial cache size is empty
Session s = (Session) ((JdbcConnection) conn).getSession();
s.clearViewIndexCache();
assertTrue(s.getViewIndexCache(true).isEmpty());
assertTrue(s.getViewIndexCache(false).isEmpty());
// create view command should not affect caches
stat.execute("create view v as select * from test");
assertTrue(s.getViewIndexCache(true).isEmpty());
assertTrue(s.getViewIndexCache(false).isEmpty());
// check view index cache
stat.executeQuery("select * from v where id > 0").next();
int size1 = s.getViewIndexCache(false).size();
assertTrue(size1 > 0);
assertTrue(s.getViewIndexCache(true).isEmpty());
stat.executeQuery("select * from v where name = 'xyz'").next();
int size2 = s.getViewIndexCache(false).size();
assertTrue(size2 > size1);
assertTrue(s.getViewIndexCache(true).isEmpty());
// check we did not add anything to view cache if we run a sub-query
stat.executeQuery("select * from (select * from test) where age = 17").next();
int size3 = s.getViewIndexCache(false).size();
assertEquals(size2, size3);
assertTrue(s.getViewIndexCache(true).isEmpty());
// check clear works
s.clearViewIndexCache();
assertTrue(s.getViewIndexCache(false).isEmpty());
assertTrue(s.getViewIndexCache(true).isEmpty());
// drop everything
stat.execute("drop view v");
stat.execute("drop table test");
conn.close();
}
private void testInnerSelectWithRownum() throws SQLException {
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("drop table test if exists");
stat.execute("create table test(id int primary key, name varchar(1))");
stat.execute("insert into test(id, name) values(1, 'b'), (3, 'a')");
ResultSet rs = stat.executeQuery(
"select nr from (select row_number() over() as nr, " +
"a.id as id from (select id from test order by name) as a) as b " +
"where b.id = 1;");
assertTrue(rs.next());
assertEquals(2, rs.getInt(1));
assertFalse(rs.next());
stat.execute("drop table test");
conn.close();
}
private void testInnerSelectWithRange() throws SQLException {
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery(
"select x from (select x from (" +
"select x from system_range(1, 5)) " +
"where x > 2 and x < 4) where x = 3");
assertTrue(rs.next());
assertFalse(rs.next());
rs = stat.executeQuery(
"select x from (select x from (" +
"select x from system_range(1, 5)) " +
"where x = 3) where x > 2 and x < 4");
assertTrue(rs.next());
assertFalse(rs.next());
conn.close();
}
private void testEmptyColumn() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("create table test(a int, b int)");
stat.execute("create view test_view as select a, b from test");
stat.execute("select * from test_view where a between 1 and 2 and b = 2");
conn.close();
}
private void testChangeSchemaSearchPath() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view;FUNCTIONS_IN_SCHEMA=TRUE");
Statement stat = conn.createStatement();
stat.execute("CREATE ALIAS X AS $$ int x() { return 1; } $$;");
stat.execute("CREATE SCHEMA S");
stat.execute("CREATE VIEW S.TEST AS SELECT X() FROM DUAL");
stat.execute("SET SCHEMA=S");
stat.execute("SET SCHEMA_SEARCH_PATH=S");
stat.execute("SELECT * FROM TEST");
conn.close();
}
private void testParameterizedView() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("CREATE TABLE Test(id INT AUTO_INCREMENT NOT NULL, " +
"f1 VARCHAR NOT NULL, f2 VARCHAR NOT NULL)");
stat.execute("INSERT INTO Test(f1, f2) VALUES ('value1','value2')");
stat.execute("INSERT INTO Test(f1, f2) VALUES ('value1','value3')");
PreparedStatement ps = conn.prepareStatement(
"CREATE VIEW Test_View AS SELECT f2 FROM Test WHERE f1=?");
ps.setString(1, "value1");
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, ps).
executeUpdate();
// ResultSet rs;
// rs = stat.executeQuery("SELECT * FROM Test_View");
// assertTrue(rs.next());
// assertFalse(rs.next());
// rs = stat.executeQuery("select VIEW_DEFINITION " +
// "from information_schema.views " +
// "where TABLE_NAME='TEST_VIEW'");
// rs.next();
// assertEquals("...", rs.getString(1));
conn.close();
}
private void testCacheFunction(boolean deterministic) throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
x = 8;
stat.execute("CREATE ALIAS GET_X " +
(deterministic ? "DETERMINISTIC" : "") +
" FOR \"" + getClass().getName() + ".getX\"");
stat.execute("CREATE VIEW V AS SELECT * FROM (SELECT GET_X())");
ResultSet rs;
rs = stat.executeQuery("SELECT * FROM V");
rs.next();
assertEquals(8, rs.getInt(1));
x = 5;
rs = stat.executeQuery("SELECT * FROM V");
rs.next();
assertEquals(deterministic ? 8 : 5, rs.getInt(1));
conn.close();
}
/**
* This method is called via reflection from the database.
*
* @return the static value x
*/
public static int getX() {
return x;
}
private void testCache() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("SET @X 8");
stat.execute("CREATE VIEW V AS SELECT * FROM (SELECT @X)");
ResultSet rs;
rs = stat.executeQuery("SELECT * FROM V");
rs.next();
assertEquals(8, rs.getInt(1));
stat.execute("SET @X 5");
rs = stat.executeQuery("SELECT * FROM V");
rs.next();
assertEquals(5, rs.getInt(1));
conn.close();
}
private void testInSelect() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("create table test(id int primary key) as select 1");
PreparedStatement prep = conn.prepareStatement(
"select * from test t where t.id in " +
"(select t2.id from test t2 where t2.id in (?, ?))");
prep.setInt(1, 1);
prep.setInt(2, 2);
prep.execute();
conn.close();
}
private void testUnionReconnect() throws SQLException {
if (config.memory) {
return;
}
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("create table t1(k smallint, ts timestamp(6))");
stat.execute("create table t2(k smallint, ts timestamp(6))");
stat.execute("create table t3(k smallint, ts timestamp(6))");
stat.execute("create view v_max_ts as select " +
"max(ts) from (select max(ts) as ts from t1 " +
"union select max(ts) as ts from t2 " +
"union select max(ts) as ts from t3)");
stat.execute("create view v_test as select max(ts) as ts from t1 " +
"union select max(ts) as ts from t2 " +
"union select max(ts) as ts from t3");
conn.close();
conn = getConnection("view");
stat = conn.createStatement();
stat.execute("select * from v_max_ts");
conn.close();
deleteDb("view");
}
private void testManyViews() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement s = conn.createStatement();
s.execute("create table t0(id int primary key)");
s.execute("insert into t0 values(1), (2), (3)");
for (int i = 0; i < 30; i++) {
s.execute("create view t" + (i + 1) + " as select * from t" + i);
s.execute("select * from t" + (i + 1));
ResultSet rs = s.executeQuery(
"select count(*) from t" + (i + 1) + " where id=2");
assertTrue(rs.next());
assertEquals(1, rs.getInt(1));
}
conn.close();
conn = getConnection("view");
conn.close();
deleteDb("view");
}
private void testReferenceView() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement s = conn.createStatement();
s.execute("create table t0(id int primary key)");
s.execute("create view t1 as select * from t0");
assertThrows(ErrorCode.FEATURE_NOT_SUPPORTED_1, s).execute(
"create table t2(id int primary key, " +
"col1 int not null, foreign key (col1) references t1(id))");
conn.close();
deleteDb("view");
}
/**
* Make sure that when we change a view, that change in reflected in other
* sessions command cache.
*/
private void testViewAlterAndCommandCache() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("create table t0(id int primary key)");
stat.execute("create table t1(id int primary key)");
stat.execute("insert into t0 values(0)");
stat.execute("insert into t1 values(1)");
stat.execute("create view v1 as select * from t0");
ResultSet rs = stat.executeQuery("select * from v1");
assertTrue(rs.next());
assertEquals(0, rs.getInt(1));
stat.execute("create or replace view v1 as select * from t1");
rs = stat.executeQuery("select * from v1");
assertTrue(rs.next());
assertEquals(1, rs.getInt(1));
conn.close();
deleteDb("view");
}
/**
* Make sure that the table constraint is still available when create a view
* of other table.
*/
private void testViewConstraintFromColumnExpression() throws SQLException {
deleteDb("view");
Connection conn = getConnection("view");
Statement stat = conn.createStatement();
stat.execute("create table t0(id1 int primary key CHECK ((ID1 % 2) = 0))");
stat.execute("create table t1(id2 int primary key CHECK ((ID2 % 1) = 0))");
stat.execute("insert into t0 values(0)");
stat.execute("insert into t1 values(1)");
stat.execute("create view v1 as select * from t0,t1");
// Check with ColumnExpression
ResultSet rs = stat.executeQuery(
"select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME = 'V1'");
assertTrue(rs.next());
assertEquals("ID1", rs.getString("COLUMN_NAME"));
assertEquals("((ID1 % 2) = 0)", rs.getString("CHECK_CONSTRAINT"));
assertTrue(rs.next());
assertEquals("ID2", rs.getString("COLUMN_NAME"));
assertEquals("((ID2 % 1) = 0)", rs.getString("CHECK_CONSTRAINT"));
// Check with AliasExpression
stat.execute("create view v2 as select ID1 key1,ID2 key2 from t0,t1");
rs = stat.executeQuery("select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME = 'V2'");
assertTrue(rs.next());
assertEquals("KEY1", rs.getString("COLUMN_NAME"));
assertEquals("((KEY1 % 2) = 0)", rs.getString("CHECK_CONSTRAINT"));
assertTrue(rs.next());
assertEquals("KEY2", rs.getString("COLUMN_NAME"));
assertEquals("((KEY2 % 1) = 0)", rs.getString("CHECK_CONSTRAINT"));
// Check hide of constraint if column is an Operation
stat.execute("create view v3 as select ID1 + 1 ID1, ID2 + 1 ID2 from t0,t1");
rs = stat.executeQuery("select * from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME = 'V3'");
assertTrue(rs.next());
assertEquals("ID1", rs.getString("COLUMN_NAME"));
assertEquals("", rs.getString("CHECK_CONSTRAINT"));
assertTrue(rs.next());
assertEquals("ID2", rs.getString("COLUMN_NAME"));
assertEquals("", rs.getString("CHECK_CONSTRAINT"));
conn.close();
deleteDb("view");
}
}