refactor

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDeleteStatement.java

@@ -26,7 +26,6 @@ public class SQLDeleteStatement extends SQLStatementImpl {
     private static final long    serialVersionUID = 1L;
     protected SQLExprTableSource tableSource;
     protected SQLExpr            where;
-    private String               alias;
 
     public SQLDeleteStatement(){
 
@@ -65,11 +64,11 @@ public class SQLDeleteStatement extends SQLStatementImpl {
     }
 
     public String getAlias() {
-        return this.alias;
+        return this.tableSource.getAlias();
     }
 
     public void setAlias(String alias) {
-        this.alias = alias;
+        this.tableSource.setAlias(alias);
     }
 
     @Override

src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertInto.java

@@ -12,7 +12,6 @@ public abstract class SQLInsertInto extends SQLObjectImpl {
 
     private static final long     serialVersionUID = 1L;
     protected SQLExprTableSource  tableSource;
-    protected String              alias;
 
     protected final List<SQLExpr> columns          = new ArrayList<SQLExpr>();
     protected ValuesClause        values;
@@ -23,11 +22,11 @@ public abstract class SQLInsertInto extends SQLObjectImpl {
     }
 
     public String getAlias() {
-        return alias;
+        return tableSource.getAlias();
     }
 
     public void setAlias(String alias) {
-        this.alias = alias;
+        this.tableSource.setAlias(alias);
     }
 
     public SQLExprTableSource getTableSource() {
@@ -45,7 +44,7 @@ public abstract class SQLInsertInto extends SQLObjectImpl {
     public void setTableName(SQLName tableName) {
         this.setTableSource(new SQLExprTableSource(tableName));
     }
-    
+
     public void setTableSource(SQLName tableName) {
         this.setTableSource(new SQLExprTableSource(tableName));
     }