fixes #928

Author: wumpz

README.md

@@ -66,6 +66,8 @@ Also I would like to know about needed examples or documentation stuff.
 
 ## Extensions in the latest SNAPSHOT version 3.2
 
+* allow **ON** as a value in a set statement (`SET myvalue = ON`)
+* support for **ALTER TABLE ONLY mytable ... **
 
 ## Extensions of JSqlParser releases
 

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

@@ -12,14 +12,14 @@
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
-
 import net.sf.jsqlparser.schema.Table;
 import net.sf.jsqlparser.statement.Statement;
 import net.sf.jsqlparser.statement.StatementVisitor;
 
 public class Alter implements Statement {
 
     private Table table;
+    private boolean useOnly = false;
 
     private List<AlterExpression> alterExpressions;
 
@@ -31,6 +31,14 @@ public void setTable(Table table) {
         this.table = table;
     }
 
+    public boolean isUseOnly() {
+        return useOnly;
+    }
+
+    public void setUseOnly(boolean useOnly) {
+        this.useOnly = useOnly;
+    }
+
     public void addAlterExpression(AlterExpression alterExpression) {
         if (alterExpressions == null) {
             alterExpressions = new ArrayList<AlterExpression>();
@@ -55,7 +63,11 @@ public void accept(StatementVisitor statementVisitor) {
     public String toString() {
 
         StringBuilder b = new StringBuilder();
-        b.append("ALTER TABLE ").append(table.getFullyQualifiedName()).append(" ");
+        b.append("ALTER TABLE ");
+        if (useOnly) {
+            b.append("ONLY ");
+        }
+        b.append(table.getFullyQualifiedName()).append(" ");
 
         Iterator<AlterExpression> altIter = alterExpressions.iterator();
 

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

@@ -4378,7 +4378,7 @@ Alter AlterTable():
 
 }
 {
-    <K_ALTER> <K_TABLE> table=Table() { alter.setTable(table); }
+    <K_ALTER> <K_TABLE> [ <K_ONLY> { alter.setUseOnly(true); } ] table=Table() { alter.setTable(table); }
      ( alterExp=AlterExpression() { alter.addAlterExpression(alterExp); }
        ("," alterExp=AlterExpression() { alter.addAlterExpression(alterExp); } )*
      )

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

@@ -388,4 +388,9 @@ public void testIssue259() throws JSQLParserException {
     public void testIssue633_2() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("CREATE INDEX idx_american_football_action_plays_1 ON american_football_action_plays USING btree (play_type)");
     }
+    
+    @Test
+    public void testAlterOnlyIssue928() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("ALTER TABLE ONLY categories ADD CONSTRAINT pk_categories PRIMARY KEY (category_id)");
+    }
 }