added restrict and set null for alter statement

Author: wumpz

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

@@ -51,6 +51,26 @@ 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() {
@@ -148,6 +168,10 @@ public String toString() {
             b.append("FOREIGN KEY (").append(PlainSelect.getStringList(fkColumns)).append(") REFERENCES ").append(fkSourceTable).append(" (").append(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");
             }
         }
         return b.toString();

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 */
@@ -2771,7 +2772,11 @@ 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

@@ -34,4 +34,16 @@ public void testAlterTableUniqueKey() throws JSQLParserException {
     public void testAlterTableForgeignKey() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("ALTER TABLE test ADD FOREIGN KEY (user_id) REFERENCES ra_user (id) ON DELETE CASCADE");
     }
+    
+    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");
+    }
 }