refactor sql parser

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

@@ -18,12 +18,20 @@ package com.alibaba.druid.sql.ast.statement;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class SQLAlterTableAddColumn extends SQLObjectImpl implements SQLAlterTableItem {
 
     private final List<SQLColumnDefinition> columns = new ArrayList<SQLColumnDefinition>();
+    
+    
+    // for mysql
+    private SQLName firstColumn;
+    private SQLName afterColumn;
+
+    private boolean first;
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {
@@ -37,4 +45,27 @@ public class SQLAlterTableAddColumn extends SQLObjectImpl implements SQLAlterTab
         return columns;
     }
 
+    public SQLName getFirstColumn() {
+        return firstColumn;
+    }
+
+    public void setFirstColumn(SQLName first) {
+        this.firstColumn = first;
+    }
+
+    public boolean isFirst() {
+        return first;
+    }
+
+    public void setFirst(boolean first) {
+        this.first = first;
+    }
+
+    public SQLName getAfterColumn() {
+        return afterColumn;
+    }
+
+    public void setAfterColumn(SQLName after) {
+        this.afterColumn = after;
+    }
 }

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

@@ -31,6 +31,9 @@ public class SQLCreateIndexStatement extends SQLStatementImpl implements SQLDDLS
     private List<SQLSelectOrderByItem> items = new ArrayList<SQLSelectOrderByItem>();
 
     private String                     type;
+    
+    // for mysql
+    private String                     using;
 
     public SQLCreateIndexStatement(){
 
@@ -75,6 +78,14 @@ public class SQLCreateIndexStatement extends SQLStatementImpl implements SQLDDLS
     public void setType(String type) {
         this.type = type;
     }
+    
+    public String getUsing() {
+        return using;
+    }
+
+    public void setUsing(String using) {
+        this.using = using;
+    }
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

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

@@ -24,6 +24,10 @@ public class SQLShowTablesStatement extends SQLStatementImpl {
 
     protected SQLName database;
     protected SQLExpr like;
+    
+    // for mysql
+    protected boolean full;
+    protected SQLExpr where;
 
     public SQLName getDatabase() {
         return database;
@@ -49,6 +53,22 @@ public class SQLShowTablesStatement extends SQLStatementImpl {
         this.like = like;
     }
     
+    public boolean isFull() {
+        return full;
+    }
+
+    public void setFull(boolean full) {
+        this.full = full;
+    }
+
+    public SQLExpr getWhere() {
+        return where;
+    }
+
+    public void setWhere(SQLExpr where) {
+        this.where = where;
+    }
+    
     @Override
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {