improved h2 support. for issue #2555

src/main/java/com/alibaba/druid/sql/parser/SQLSelectParser.java

@@ -274,6 +274,22 @@ public class SQLSelectParser extends SQLParser {
 
         parseFetchClause(queryBlock);
 
+        if (lexer.token() == Token.FOR) {
+            lexer.nextToken();
+            accept(Token.UPDATE);
+
+            queryBlock.setForUpdate(true);
+
+            if (lexer.identifierEquals(FnvHash.Constants.NO_WAIT) || lexer.identifierEquals(FnvHash.Constants.NOWAIT)) {
+                lexer.nextToken();
+                queryBlock.setNoWait(true);
+            } else if (lexer.identifierEquals(FnvHash.Constants.WAIT)) {
+                lexer.nextToken();
+                SQLExpr waitTime = this.exprParser.primary();
+                queryBlock.setWaitTime(waitTime);
+            }
+        }
+
         return queryRest(queryBlock, acceptUnion);
     }
 

src/test/java/com/alibaba/druid/bvt/sql/h2/H2_Select_1_for_update.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 1999-2017 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.h2;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+
+import java.util.List;
+
+public class H2_Select_1_for_update extends TestCase {
+
+    public void test_0() throws Exception {
+        String sql = //
+                "SELECT * FROM QRTZ_LOCKS WHERE SCHED_NAME = 'adminQuartzScheduler' AND LOCK_NAME = ? FOR UPDATE"; //
+
+//        System.out.println(sql);
+
+        List<SQLStatement> stmtList = SQLUtils.toStatementList(sql, JdbcConstants.H2);
+        SQLStatement stmt = stmtList.get(0);
+
+        assertEquals(1, stmtList.size());
+
+        SchemaStatVisitor visitor = SQLUtils.createSchemaStatVisitor(JdbcConstants.H2);
+        stmt.accept(visitor);
+
+        assertEquals("SELECT *\n" +
+                "FROM QRTZ_LOCKS\n" +
+                "WHERE SCHED_NAME = 'adminQuartzScheduler'\n" +
+                "\tAND LOCK_NAME = ?\n" +
+                "FOR UPDATE", stmt.toString());
+
+        assertEquals("select *\n" +
+                "from QRTZ_LOCKS\n" +
+                "where SCHED_NAME = 'adminQuartzScheduler'\n" +
+                "\tand LOCK_NAME = ?\n" +
+                "for update", stmt.toLowerCaseString());
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("relationships : " + visitor.getRelationships());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        assertEquals(1, visitor.getTables().size());
+        assertEquals(3, visitor.getColumns().size());
+        assertEquals(2, visitor.getConditions().size());
+        assertEquals(0, visitor.getRelationships().size());
+        assertEquals(0, visitor.getOrderByColumns().size());
+
+        assertTrue(visitor.containsTable("QRTZ_LOCKS"));
+
+    }
+}