- from clause can now be used in update statements

Author: wumpz

src/main/java/net/sf/jsqlparser/statement/update/Update.java

@@ -21,6 +21,7 @@
  */
 package net.sf.jsqlparser.statement.update;
 
+import java.util.Iterator;
 import java.util.List;
 
 import net.sf.jsqlparser.expression.Expression;
@@ -113,13 +114,26 @@ public String toString() {
 		StringBuilder b = new StringBuilder("UPDATE ");
 		b.append(getTable()).append(" SET ");
 		for (int i = 0; i < getColumns().size(); i++) {
-			if (i !=0 ) {
+			if (i != 0) {
 				b.append(", ");
 			}
 			b.append(columns.get(i)).append(" = ");
 			b.append(expressions.get(i));
 		}
 
+		if (fromItem != null) {
+			b.append(" FROM ").append(fromItem);
+			if (joins != null) {
+				for (Join join : joins) {
+					if (join.isSimple()) {
+						b.append(", ").append(join);
+					} else {
+						b.append(" ").append(join);
+					}
+				}
+			}
+		}
+
 		if (where != null) {
 			b.append(" WHERE ");
 			b.append(where);

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

@@ -24,6 +24,7 @@
 import net.sf.jsqlparser.expression.Expression;
 import net.sf.jsqlparser.expression.ExpressionVisitor;
 import net.sf.jsqlparser.schema.Column;
+import net.sf.jsqlparser.statement.select.Join;
 import net.sf.jsqlparser.statement.update.Update;
 
 /**
@@ -68,7 +69,19 @@ public void deParse(Update update) {
 			if (i < update.getColumns().size() - 1) {
 				buffer.append(", ");
 			}
-
+		}
+		
+		if (update.getFromItem() != null) {
+			buffer.append(" FROM ").append(update.getFromItem());
+			if (update.getJoins() != null) {
+				for (Join join : update.getJoins()) {
+					if (join.isSimple()) {
+						buffer.append(", ").append(join);
+					} else {
+						buffer.append(" ").append(join);
+					}
+				}
+			}
 		}
 
 		if (update.getWhere() != null) {

src/test/java/net/sf/jsqlparser/test/update/UpdateTest.java

@@ -47,6 +47,10 @@ public void testUpdateWithDeparser() throws JSQLParserException {
 		assertSqlCanBeParsedAndDeparsed("UPDATE table1 AS A SET A.column = 'XXX' WHERE A.cod_table = 'YYY'");
 	}
 
+	public void testUpdateWithFrom() throws JSQLParserException {
+		assertSqlCanBeParsedAndDeparsed("UPDATE table1 SET column = 5 FROM table1 LEFT JOIN table2 ON col1 = col2");
+	}
+	
 	private void assertSqlCanBeParsedAndDeparsed(String statement) throws JSQLParserException {
 		Statement parsed = parserManager.parse(new StringReader(statement));
 		assertStatementCanBeDeparsedAs(parsed, statement);