improved OracleSysdateExpr toString, fix #4084

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/OracleSQLObjectImpl.java

@@ -19,6 +19,7 @@ import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLDataType;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
+import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public abstract class OracleSQLObjectImpl extends SQLObjectImpl implements OracleSQLObject {
@@ -31,6 +32,11 @@ public abstract class OracleSQLObjectImpl extends SQLObjectImpl implements Oracl
     protected void accept0(SQLASTVisitor v) {
         if (v instanceof OracleASTVisitor) {
             this.accept0((OracleASTVisitor) v);
+            return;
+        }
+
+        if (v instanceof SQLASTOutputVisitor) {
+            ((SQLASTOutputVisitor) v).print(this.toString());
         }
     }
 

src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSysdateTest.java

@@ -0,0 +1,39 @@
+/*
+ * 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.oracle.select;
+
+import com.alibaba.druid.DbType;
+import com.alibaba.druid.sql.OracleTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.expr.OracleSysdateExpr;
+import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
+import com.alibaba.druid.util.JdbcConstants;
+
+import java.util.List;
+
+public class OracleSysdateTest extends OracleTest {
+    private DbType dbType = JdbcConstants.ORACLE;
+
+    public void test_0() throws Exception {
+        OracleSysdateExpr sysdate = new OracleSysdateExpr();
+
+        StringBuffer buf = new StringBuffer();
+        SQLASTOutputVisitor v = new SQLASTOutputVisitor(buf);
+        sysdate.accept(v);
+        assertEquals("SYSDATE",  buf.toString());
+    }
+}