fixes #178, merged upstream

Author: bgaborg

src/main/java/net/sf/jsqlparser/statement/alter/Alter.java

@@ -53,6 +53,26 @@ public void setOnDeleteCascade(boolean onDeleteCascade) {
         this.onDeleteCascade = onDeleteCascade;
     }
 
+    private boolean onDeleteRestrict;
+
+    public boolean isOnDeleteRestrict() {
+        return onDeleteRestrict;
+    }
+
+    public void setOnDeleteRestrict(boolean onDeleteRestrict) {
+        this.onDeleteRestrict = onDeleteRestrict;
+    }
+
+    private boolean onDeleteSetNull;
+
+    public boolean isOnDeleteSetNull() {
+        return onDeleteSetNull;
+    }
+
+    public void setOnDeleteSetNull(boolean onDeleteSetNull) {
+        this.onDeleteSetNull = onDeleteSetNull;
+    }
+
     private List<String> fkColumns;
 
     public List<String> getFkColumns() {
@@ -159,6 +179,10 @@ public String toString() {
 				PlainSelect.getStringList(fkSourceColumns)).append(")");
             if (isOnDeleteCascade()) {
                 b.append(" ON DELETE CASCADE");
+            } else if (isOnDeleteRestrict()) {
+                b.append(" ON DELETE RESTRICT");
+            } else if (isOnDeleteSetNull()) {
+                b.append(" ON DELETE SET NULL");
             }
 		} else if (fkIndex != null) {
 			b.append(fkIndex);

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

@@ -226,6 +226,7 @@ TOKEN: /* SQL Keywords. prefixed with K_ to avoid name clashes */
 |   <K_MERGE: "MERGE">
 |   <K_MATCHED: "MATCHED">
 |   <K_CASCADE: "CASCADE">
+|   <K_RESTRICT: "RESTRICT">
 }
 
 TOKEN : /* Numeric Constants */
@@ -2775,7 +2776,11 @@ Alter Alter():
         ( <K_FOREIGN> <K_KEY> columnNames=ColumnsNamesList() { alter.setFkColumns(columnNames); }
              <K_REFERENCES> tk=<S_IDENTIFIER> columnNames=ColumnsNamesList() 
                     { alter.setFkSourceTable(tk.image); alter.setFkSourceColumns(columnNames); }
-            [<K_ON> <K_DELETE> <K_CASCADE> { alter.setOnDeleteCascade(true); } ] )
+            [<K_ON> <K_DELETE>
+                            (<K_CASCADE> { alter.setOnDeleteCascade(true); }
+                            | <K_RESTRICT> { alter.setOnDeleteRestrict(true); }
+                            | <K_SET> <K_NULL> { alter.setOnDeleteSetNull(true); } ) ]
+        )
         |
         (
             {

src/test/java/net/sf/jsqlparser/test/alter/AlterTest.java

@@ -38,4 +38,16 @@ public void testAlterTableForgeignKey() throws JSQLParserException {
 	public void testAlterTableAddConstraint() throws JSQLParserException {
 		assertSqlCanBeParsedAndDeparsed("ALTER TABLE RESOURCELINKTYPE ADD CONSTRAINT FK_RESOURCELINKTYPE_PARENTTYPE_PRIMARYKEY FOREIGN KEY (PARENTTYPE_PRIMARYKEY) REFERENCES RESOURCETYPE(PRIMARYKEY)");
 	}
+    
+    public void testAlterTableForgeignKey2() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("ALTER TABLE test ADD FOREIGN KEY (user_id) REFERENCES ra_user (id)");
+    }
+    
+    public void testAlterTableForgeignKey3() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("ALTER TABLE test ADD FOREIGN KEY (user_id) REFERENCES ra_user (id) ON DELETE RESTRICT");
+    }
+    
+    public void testAlterTableForgeignKey4() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("ALTER TABLE test ADD FOREIGN KEY (user_id) REFERENCES ra_user (id) ON DELETE SET NULL");
+    }
 }