Issue#556 close connections in tests (at least in case of successful execution)

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

@@ -92,7 +92,7 @@ public class TestFullText extends TestBase {
 
     private static void close(Collection<Connection> list) throws SQLException {
         for (Connection conn : list) {
-            conn.close();
+            try { conn.close(); } catch (SQLException ignore) {/**/}
         }
     }
 
@@ -491,8 +491,7 @@ public class TestFullText extends TestBase {
             return;
         }
         deleteDb("fullText");
-        ArrayList<Connection> connList = new ArrayList<Connection>();
-        Connection conn = getConnection("fullText", connList);
+        Connection conn = getConnection("fullText");
         String prefix = lucene ? "FTL_" : "FT_";
         Statement stat = conn.createStatement();
         String className = lucene ? "FullTextLucene" : "FullText";
@@ -590,15 +589,15 @@ public class TestFullText extends TestBase {
 
         if (!config.memory) {
             conn.close();
+            conn = getConnection("fullText");
         }
 
-        conn = getConnection("fullText", connList);
         stat = conn.createStatement();
         stat.executeQuery("SELECT * FROM " + prefix + "SEARCH('World', 0, 0)");
 
         stat.execute("CALL " + prefix + "DROP_ALL()");
 
-        close(connList);
+        conn.close();
     }
 
     private void testDropIndex(boolean lucene) throws SQLException {
@@ -625,7 +624,6 @@ public class TestFullText extends TestBase {
                 "_CREATE_INDEX('PUBLIC', 'TEST', 'NAME1, NAME2')");
         stat.execute("UPDATE TEST SET NAME2=NULL WHERE ID=1");
         stat.execute("UPDATE TEST SET NAME2='Hello World' WHERE ID=1");
-        conn.close();
 
         conn.close();
         FileUtils.deleteRecursive(getBaseDir() + "/fullTextDropIndex", false);

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

@@ -1285,6 +1285,7 @@ public class TestFunctions extends TestBase implements AggregateFunction {
                 String.format("SELECT ORA_HASH('%s', 0) FROM DUAL", testStr));
         assertResult(String.valueOf("foo".hashCode()), stat,
                 String.format("SELECT ORA_HASH('%s', 0, 0) FROM DUAL", testStr));
+        conn.close();
     }
 
     private void testToDateException() {
@@ -2058,6 +2059,7 @@ public class TestFunctions extends TestBase implements AggregateFunction {
 
         assertFalse(parsed.before(before));
         assertFalse(parsed.after(after));
+        conn.close();
     }
 
 
@@ -2083,6 +2085,7 @@ public class TestFunctions extends TestBase implements AggregateFunction {
         rs.close();
 
         assertEquals(first, second);
+        conn.close();
     }
 
     private void testThatCurrentTimestampUpdatesOutsideATransaction()
@@ -2107,26 +2110,26 @@ public class TestFunctions extends TestBase implements AggregateFunction {
         rs.close();
 
         assertTrue(second.after(first));
+        conn.close();
     }
 
     private void callCompiledFunction(String functionName) throws SQLException {
         deleteDb("functions");
-        Connection conn = getConnection("functions");
-        Statement stat = conn.createStatement();
-        ResultSet rs;
-        stat.execute("create alias " + functionName + " AS "
-                + "$$ boolean " + functionName + "() "
-                + "{ return true; } $$;");
-
-        PreparedStatement stmt = conn.prepareStatement(
-                "select " + functionName + "() from dual");
-        rs = stmt.executeQuery();
-        rs.next();
-        assertEquals(Boolean.class.getName(), rs.getObject(1).getClass().getName());
-
-        stat.execute("drop alias " + functionName + "");
+        try (Connection conn = getConnection("functions")) {
+            Statement stat = conn.createStatement();
+            ResultSet rs;
+            stat.execute("create alias " + functionName + " AS "
+                    + "$$ boolean " + functionName + "() "
+                    + "{ return true; } $$;");
+
+            PreparedStatement stmt = conn.prepareStatement(
+                    "select " + functionName + "() from dual");
+            rs = stmt.executeQuery();
+            rs.next();
+            assertEquals(Boolean.class.getName(), rs.getObject(1).getClass().getName());
 
-        conn.close();
+            stat.execute("drop alias " + functionName + "");
+        }
     }
 
     private void assertCallResult(String expected, Statement stat, String sql)

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

@@ -36,75 +36,75 @@ public class TestQueryCache extends TestBase {
     }
 
     private void test1() throws Exception {
-        Connection conn = getConnection("queryCache;QUERY_CACHE_SIZE=10");
-        Statement stat = conn.createStatement();
-        stat.execute("create table test(id int, name varchar)");
-        PreparedStatement prep;
-        // query execution may be fast here but the parsing must be slow
-        StringBuilder queryBuilder = new StringBuilder("select count(*) from test t1 where \n");
-        for (int i = 0; i < 1000; i++) {
-            if (i != 0) {
-                queryBuilder.append(" and ");
+        try (Connection conn = getConnection("queryCache;QUERY_CACHE_SIZE=10")) {
+            Statement stat = conn.createStatement();
+            stat.execute("create table test(id int, name varchar)");
+            PreparedStatement prep;
+            // query execution may be fast here but the parsing must be slow
+            StringBuilder queryBuilder = new StringBuilder("select count(*) from test t1 where \n");
+            for (int i = 0; i < 1000; i++) {
+                if (i != 0) {
+                    queryBuilder.append(" and ");
+                }
+                queryBuilder.append(" TIMESTAMP '2005-12-31 23:59:59' = TIMESTAMP '2005-12-31 23:59:59' ");
             }
-            queryBuilder.append(" TIMESTAMP '2005-12-31 23:59:59' = TIMESTAMP '2005-12-31 23:59:59' ");
-        }
-        String query = queryBuilder.toString();
-        conn.prepareStatement(query);
-        int firstGreater = 0;
-        int firstSmaller = 0;
-        long time;
-        ResultSet rs;
-        long first = 0;
-        // 1000 iterations to warm up and avoid JIT effects
-        for (int i = 0; i < 1005; i++) {
-            // this should both ensure results are not re-used
-            // stat.execute("set mode regular");
-            // stat.execute("create table x()");
-            // stat.execute("drop table x");
-            time = System.nanoTime();
-            prep = conn.prepareStatement(query);
-            execute(prep);
-            prep.close();
-            rs = stat.executeQuery(query);
-            rs.next();
-            int c = rs.getInt(1);
-            rs.close();
-            assertEquals(0, c);
-            time = System.nanoTime() - time;
-            if (i == 1000) {
-                // take from cache and do not close, so that next iteration will have a cache miss
+            String query = queryBuilder.toString();
+            conn.prepareStatement(query);
+            int firstGreater = 0;
+            int firstSmaller = 0;
+            long time;
+            ResultSet rs;
+            long first = 0;
+            // 1000 iterations to warm up and avoid JIT effects
+            for (int i = 0; i < 1005; i++) {
+                // this should both ensure results are not re-used
+                // stat.execute("set mode regular");
+                // stat.execute("create table x()");
+                // stat.execute("drop table x");
+                time = System.nanoTime();
                 prep = conn.prepareStatement(query);
-            } else if (i == 1001) {
-                first = time;
-                // try to avoid pauses in subsequent iterations
-                System.gc();
-            } else if (i > 1001) {
-                if (first > time) {
-                    firstGreater++;
-                } else {
-                    firstSmaller++;
+                execute(prep);
+                prep.close();
+                rs = stat.executeQuery(query);
+                rs.next();
+                int c = rs.getInt(1);
+                rs.close();
+                assertEquals(0, c);
+                time = System.nanoTime() - time;
+                if (i == 1000) {
+                    // take from cache and do not close, so that next iteration will have a cache miss
+                    prep = conn.prepareStatement(query);
+                } else if (i == 1001) {
+                    first = time;
+                    // try to avoid pauses in subsequent iterations
+                    System.gc();
+                } else if (i > 1001) {
+                    if (first > time) {
+                        firstGreater++;
+                    } else {
+                        firstSmaller++;
+                    }
                 }
             }
+            // first prepare time must be always greater because of query cache,
+            // but JVM is too unpredictable to assert that, so just check that
+            // usually this is true
+            assertSmaller(firstSmaller, firstGreater);
+            stat.execute("drop table test");
         }
-        // first prepare time must be always greater because of query cache,
-        // but JVM is too unpredictable to assert that, so just check that
-        // usually this is true
-        assertSmaller(firstSmaller, firstGreater);
-        stat.execute("drop table test");
-        conn.close();
     }
 
     private void testClearingCacheWithTableStructureChanges() throws Exception {
-        Connection conn = getConnection("queryCache;QUERY_CACHE_SIZE=10");
-        assertThrows(ErrorCode.TABLE_OR_VIEW_NOT_FOUND_1, conn).
-                prepareStatement("SELECT * FROM TEST");
-        Statement stat = conn.createStatement();
-        stat.executeUpdate("CREATE TABLE TEST(col1 bigint, col2 varchar(255))");
-        PreparedStatement prep = conn.prepareStatement("SELECT * FROM TEST");
-        prep.close();
-        stat.executeUpdate("DROP TABLE TEST");
-        assertThrows(ErrorCode.TABLE_OR_VIEW_NOT_FOUND_1, conn).
-                prepareStatement("SELECT * FROM TEST");
-        conn.close();
+        try (Connection conn = getConnection("queryCache;QUERY_CACHE_SIZE=10")) {
+            assertThrows(ErrorCode.TABLE_OR_VIEW_NOT_FOUND_1, conn).
+                    prepareStatement("SELECT * FROM TEST");
+            Statement stat = conn.createStatement();
+            stat.executeUpdate("CREATE TABLE TEST(col1 bigint, col2 varchar(255))");
+            PreparedStatement prep = conn.prepareStatement("SELECT * FROM TEST");
+            prep.close();
+            stat.executeUpdate("DROP TABLE TEST");
+            assertThrows(ErrorCode.TABLE_OR_VIEW_NOT_FOUND_1, conn).
+                    prepareStatement("SELECT * FROM TEST");
+        }
     }
 }

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

@@ -33,34 +33,36 @@ public class TestShow extends TestBase {
     }
 
     private void testPgCompatibility() throws SQLException {
-        Connection conn = getConnection("mem:pg");
-        Statement stat = conn.createStatement();
+        try (Connection conn = getConnection("mem:pg")) {
+            Statement stat = conn.createStatement();
 
-        assertResult("UNICODE", stat, "SHOW CLIENT_ENCODING");
-        assertResult("read committed", stat, "SHOW DEFAULT_TRANSACTION_ISOLATION");
-        assertResult("read committed", stat, "SHOW TRANSACTION ISOLATION LEVEL");
-        assertResult("ISO", stat, "SHOW DATESTYLE");
-        assertResult("8.1.4", stat, "SHOW SERVER_VERSION");
-        assertResult("UTF8", stat, "SHOW SERVER_ENCODING");
+            assertResult("UNICODE", stat, "SHOW CLIENT_ENCODING");
+            assertResult("read committed", stat, "SHOW DEFAULT_TRANSACTION_ISOLATION");
+            assertResult("read committed", stat, "SHOW TRANSACTION ISOLATION LEVEL");
+            assertResult("ISO", stat, "SHOW DATESTYLE");
+            assertResult("8.1.4", stat, "SHOW SERVER_VERSION");
+            assertResult("UTF8", stat, "SHOW SERVER_ENCODING");
+        }
     }
 
     private void testMysqlCompatibility() throws SQLException {
-        Connection conn = getConnection("mem:pg");
-        Statement stat = conn.createStatement();
-        ResultSet rs;
+        try (Connection conn = getConnection("mem:pg")) {
+            Statement stat = conn.createStatement();
+            ResultSet rs;
 
-        // show tables without a schema
-        stat.execute("create table person(id int, name varchar)");
-        rs = stat.executeQuery("SHOW TABLES");
-        assertTrue(rs.next());
-        assertEquals("PERSON", rs.getString(1));
-        assertEquals("PUBLIC", rs.getString(2));
-        assertFalse(rs.next());
+            // show tables without a schema
+            stat.execute("create table person(id int, name varchar)");
+            rs = stat.executeQuery("SHOW TABLES");
+            assertTrue(rs.next());
+            assertEquals("PERSON", rs.getString(1));
+            assertEquals("PUBLIC", rs.getString(2));
+            assertFalse(rs.next());
 
-        // show tables with a schema
-        assertResultRowCount(1, stat.executeQuery("SHOW TABLES FROM PUBLIC"));
+            // show tables with a schema
+            assertResultRowCount(1, stat.executeQuery("SHOW TABLES FROM PUBLIC"));
 
-        // columns
-        assertResultRowCount(2, stat.executeQuery("SHOW COLUMNS FROM person"));
+            // columns
+            assertResultRowCount(2, stat.executeQuery("SHOW COLUMNS FROM person"));
+        }
     }
 }

h2/src/test/org/h2/test/jdbc/TestConnection.java

@@ -45,6 +45,7 @@ public class TestConnection extends TestBase {
 
         assertThrows(SQLClientInfoException.class, conn).setClientInfo("numServers", "SomeValue");
         assertThrows(SQLClientInfoException.class, conn).setClientInfo("server23", "SomeValue");
+        conn.close();
     }
 
     private void testSetUnsupportedClientInfoProperties() throws SQLException {
@@ -54,6 +55,7 @@ public class TestConnection extends TestBase {
         properties.put("ClientUser", "someUser");
 
         assertThrows(SQLClientInfoException.class, conn).setClientInfo(properties);
+        conn.close();
     }
 
     private void testSetSupportedClientInfoProperties() throws SQLException {
@@ -67,6 +69,7 @@ public class TestConnection extends TestBase {
         assertNull(conn.getClientInfo("ApplicationName"));
         // new property has been set
         assertEquals(conn.getClientInfo("ClientUser"), "someUser");
+        conn.close();
     }
 
     private void testSetSupportedClientInfo() throws SQLException {
@@ -74,17 +77,20 @@ public class TestConnection extends TestBase {
         conn.setClientInfo("ApplicationName", "Connection Test");
 
         assertEquals(conn.getClientInfo("ApplicationName"), "Connection Test");
+        conn.close();
     }
 
     private void testSetUnsupportedClientInfo() throws SQLException {
         Connection conn = getConnection("clientInfoDB2;MODE=DB2");
         assertThrows(SQLClientInfoException.class, conn).setClientInfo(
                 "UnsupportedName", "SomeValue");
+        conn.close();
     }
 
     private void testGetUnsupportedClientInfo() throws SQLException {
         Connection conn = getConnection("clientInfo");
         assertNull(conn.getClientInfo("UnknownProperty"));
+        conn.close();
     }
 
     private void testSetGetSchema() throws SQLException {