Date expressions

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitor.java

@@ -164,5 +164,7 @@ public interface ExpressionVisitor {
     void visit(RowConstructor rowConstructor);
 
     void visit(OracleHint hint);
-
+
+    void visit(TimeKeyExpression timeKeyExpression);
+
 }

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitorAdapter.java

@@ -455,5 +455,10 @@ public void visit(HexValue hexValue) {
     public void visit(OracleHint hint) {
 
     }
-
+
+    @Override
+    public void visit(TimeKeyExpression timeKeyExpression) {
+
+    }
+
 }

src/main/java/net/sf/jsqlparser/expression/TimeKeyExpression.java

@@ -0,0 +1,49 @@
+/*
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2016 JSQLParser
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 2.1 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ * #L%
+ */
+package net.sf.jsqlparser.expression;
+
+public class TimeKeyExpression implements Expression {
+
+    private String stringValue;
+
+    public TimeKeyExpression(final String value) {
+        this.stringValue = value;
+    }
+
+    @Override
+    public void accept(ExpressionVisitor expressionVisitor) {
+        expressionVisitor.visit(this);
+    }
+
+    public String getStringValue() {
+        return stringValue;
+    }
+
+    public void setStringValue(String string) {
+        stringValue = string;
+    }
+
+    @Override
+    public String toString() {
+        return getStringValue();
+    }
+}

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -652,4 +652,7 @@ public void visit(AlterView alterView) {
         throw new UnsupportedOperationException(NOT_SUPPORTED_YET); 
     }
 
+    @Override
+    public void visit(TimeKeyExpression timeKeyExpression) {
+    }
 }

src/main/java/net/sf/jsqlparser/util/deparser/ExpressionDeParser.java

@@ -575,5 +575,10 @@ public void visit(RowConstructor rowConstructor) {
     public void visit(OracleHint hint) {
         buffer.append(hint.toString());
     }
-
+
+    @Override
+    public void visit(TimeKeyExpression timeKeyExpression) {
+        buffer.append(timeKeyExpression.toString());
+    }
+
 }

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -233,6 +233,7 @@ TOKEN: /* SQL Keywords. prefixed with K_ to avoid name clashes */
 |	<K_HIGH_PRIORITY : "HIGH_PRIORITY">
 |	<K_IGNORE : "IGNORE">
 |   <K_SEMI : "SEMI">
+|   <K_TIME_KEY_EXPR : ( "CURRENT_TIMESTAMP" | "CURRENT_TIME" | "CURRENT_DATE" ) ( "()" )?>
 }
 
 TOKEN : /* Operators */
@@ -2046,6 +2047,9 @@ Expression PrimaryExpression():
 
 	| LOOKAHEAD(2) [sign="+" | sign="-"] retval=CastExpression()
 
+    // support timestamp expressions
+	| token=<K_TIME_KEY_EXPR> { retval = new TimeKeyExpression(token.image); }
+
 	| LOOKAHEAD(["+" | "-"] Column())         [sign="+" | sign="-"] retval=Column()
 
 	| LOOKAHEAD(["+" | "-"] "(" BitwiseAndOr() ")") [sign="+" | sign="-"] "(" retval=BitwiseAndOr() ")" {retval = new Parenthesis(retval); }
@@ -2790,6 +2794,8 @@ String CreateParameter():
             tk=<K_DELETE> { retval = tk.image; } 
             |
             tk=<K_UPDATE> { retval = tk.image; }
+            |
+            tk=<K_TIME_KEY_EXPR> { retval = new TimeKeyExpression(tk.image).toString(); }
             |
 			"=" { retval = "="; }
 			|

src/test/java/net/sf/jsqlparser/expression/ExpressionVisitorAdapterTest.java

@@ -24,6 +24,7 @@
 import net.sf.jsqlparser.expression.operators.relational.InExpression;
 import net.sf.jsqlparser.expression.operators.relational.ItemsList;
 import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.schema.Column;
 import net.sf.jsqlparser.statement.select.PlainSelect;
 import net.sf.jsqlparser.statement.select.Select;
 import org.junit.After;
@@ -130,5 +131,42 @@ public void visit(OracleHint hint) {
         assertEquals(singleLine, holder[0].isSingleLine());
         assertEquals(hint, holder[0].getValue());
     }
-
+
+    @Test
+    public void testCurrentTimestampExpression() throws JSQLParserException{
+        final List<String> columnList = new ArrayList<String>();
+        Select select = (Select) CCJSqlParserUtil.parse( "select * from foo where bar < CURRENT_TIMESTAMP" );
+        PlainSelect plainSelect = (PlainSelect) select.getSelectBody();
+        Expression where = plainSelect.getWhere();
+        where.accept(new ExpressionVisitorAdapter() {
+
+            @Override
+            public void visit(Column column) {
+                super.visit(column);
+                columnList.add(column.getColumnName());
+            }
+        });
+
+        assertEquals(1, columnList.size());
+        assertEquals("bar", columnList.get(0));
+    }
+
+    @Test
+    public void testCurrentDateExpression() throws JSQLParserException{
+        final List<String> columnList = new ArrayList<String>();
+        Select select = (Select) CCJSqlParserUtil.parse( "select * from foo where bar < CURRENT_DATE" );
+        PlainSelect plainSelect = (PlainSelect) select.getSelectBody();
+        Expression where = plainSelect.getWhere();
+        where.accept(new ExpressionVisitorAdapter() {
+
+            @Override
+            public void visit(Column column) {
+                super.visit(column);
+                columnList.add(column.getColumnName());
+            }
+        });
+
+        assertEquals(1, columnList.size());
+        assertEquals("bar", columnList.get(0));
+    }
 }