fixes #174

Author: wumpz

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

@@ -41,6 +41,46 @@ public class Alter implements Statement {
     private List<String> ukColumns;
     private String ukName;
 
+    private boolean onDeleteCascade;
+
+    public boolean isOnDeleteCascade() {
+        return onDeleteCascade;
+    }
+
+    public void setOnDeleteCascade(boolean onDeleteCascade) {
+        this.onDeleteCascade = onDeleteCascade;
+    }
+
+    private List<String> fkColumns;
+
+    public List<String> getFkColumns() {
+        return fkColumns;
+    }
+
+    public void setFkColumns(List<String> fkColumns) {
+        this.fkColumns = fkColumns;
+    }
+
+    private String fkSourceTable;
+
+    public String getFkSourceTable() {
+        return fkSourceTable;
+    }
+
+    public void setFkSourceTable(String fkSourceTable) {
+        this.fkSourceTable = fkSourceTable;
+    }
+
+    private List<String> fkSourceColumns;
+
+    public List<String> getFkSourceColumns() {
+        return fkSourceColumns;
+    }
+
+    public void setFkSourceColumns(List<String> fkSourceColumns) {
+        this.fkSourceColumns = fkSourceColumns;
+    }
+
     public Table getTable() {
         return table;
     }
@@ -104,6 +144,11 @@ public String toString() {
             b.append("PRIMARY KEY (").append(PlainSelect.getStringList(pkColumns)).append(")");
         } else if (ukColumns != null) {
             b.append("UNIQUE KEY ").append(ukName).append(" (").append(PlainSelect.getStringList(ukColumns)).append(")");
+        } else if (fkColumns != null) {
+            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");
+            }
         }
         return b.toString();
     }

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

@@ -225,6 +225,7 @@ TOKEN: /* SQL Keywords. prefixed with K_ to avoid name clashes */
 |   <K_SKIP: "SKIP">
 |   <K_MERGE: "MERGE">
 |   <K_MATCHED: "MATCHED">
+|   <K_CASCADE: "CASCADE">
 }
 
 TOKEN : /* Numeric Constants */
@@ -2655,6 +2656,8 @@ String CreateParameter():
 			tk=<K_ROWS> { retval = tk.image; } 
             |
             tk=<K_UNIQUE> { retval = tk.image; } 
+            |
+            tk=<K_CASCADE> { retval = tk.image; } 
 			|
             tk=<K_DELETE> { retval = tk.image; } 
             |
@@ -2717,7 +2720,7 @@ Drop Drop():
 	)
     { drop.setType(tk.image); }
 	name = Table() { drop.setName(name); }
-	(tk=<S_IDENTIFIER> { dropArgs.add(tk.image); })*
+	((tk=<S_IDENTIFIER> | tk=<K_CASCADE>) { dropArgs.add(tk.image); })*
 
 	{
 		if (dropArgs.size() > 0)
@@ -2745,8 +2748,7 @@ Alter Alter():
 	Table table;
 	Token tk;
 	ColDataType dataType;
-    List<String> pkColumnNames = null;
-    List<String> ukColumnNames = null;
+    List<String> columnNames = null;
 }
 {
 	<K_ALTER> <K_TABLE> table=Table() { alter.setTable(table); } 
@@ -2762,9 +2764,14 @@ Alter Alter():
             }
         )
         |
-        ( <K_PRIMARY> <K_KEY> pkColumnNames=ColumnsNamesList() { alter.setPkColumns(pkColumnNames); } )
+        ( <K_PRIMARY> <K_KEY> columnNames=ColumnsNamesList() { alter.setPkColumns(columnNames); } )
+        |
+        ( <K_UNIQUE> <K_KEY> (tk=<S_IDENTIFIER>	| tk=<S_QUOTED_IDENTIFIER>) columnNames=ColumnsNamesList() { alter.setUkName(tk.image); alter.setUkColumns(columnNames); } )
         |
-        ( <K_UNIQUE> <K_KEY> (tk=<S_IDENTIFIER>	| tk=<S_QUOTED_IDENTIFIER>) ukColumnNames=ColumnsNamesList() { alter.setUkName(tk.image); alter.setUkColumns(ukColumnNames); } )
+        ( <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); } ] )
     )
 
     {

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

@@ -30,4 +30,8 @@ public void testAlterTablePrimaryKey() throws JSQLParserException {
     public void testAlterTableUniqueKey() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("ALTER TABLE `schema_migrations` ADD UNIQUE KEY `unique_schema_migrations` (`version`)");
     }
+    
+    public void testAlterTableForgeignKey() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("ALTER TABLE test ADD FOREIGN KEY (user_id) REFERENCES ra_user (id) ON DELETE CASCADE");
+    }
 }