sql parser refactor

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -83,6 +83,7 @@ import com.alibaba.druid.sql.ast.statement.SQLUniqueConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
 import com.alibaba.druid.sql.ast.statement.SQLUseStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 
 public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
 
@@ -1005,4 +1006,16 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
         return false;
     }
 
+    @Override
+    public boolean visit(OracleAlterTableAddColumn x) {
+        print("ADD (");
+        printAndAccept(x.getColumns(), ", ");
+        print(")");
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleAlterTableAddColumn x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java

@@ -77,6 +77,7 @@ import com.alibaba.druid.sql.ast.statement.SQLUniqueConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
 import com.alibaba.druid.sql.ast.statement.SQLUseStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 
 public interface SQLASTVisitor {
 
@@ -336,4 +337,7 @@ public interface SQLASTVisitor {
     
     boolean visit(SQLUseStatement x);
 
+    boolean visit(OracleAlterTableAddColumn x);
+
+    void endVisit(OracleAlterTableAddColumn x);
 }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java

@@ -78,6 +78,7 @@ import com.alibaba.druid.sql.ast.statement.SQLUniqueConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
 import com.alibaba.druid.sql.ast.statement.SQLUseStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 
 public class SQLASTVisitorAdapter implements SQLASTVisitor {
 
@@ -585,4 +586,13 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
         return true;
     }
 
+    @Override
+    public boolean visit(OracleAlterTableAddColumn x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(OracleAlterTableAddColumn x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -21,6 +21,7 @@ import com.alibaba.druid.sql.ast.expr.SQLInSubQueryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCommentStatement;
@@ -40,6 +41,7 @@ import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLTableElement;
 import com.alibaba.druid.sql.ast.statement.SQLTruncateStatement;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.stat.TableStat;
 import com.alibaba.druid.stat.TableStat.Column;
 import com.alibaba.druid.stat.TableStat.Condition;
@@ -899,4 +901,21 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
     public boolean visit(SQLCurrentOfCursorExpr x) {
         return false;
     }
+    
+    @Override
+    public boolean visit(OracleAlterTableAddColumn x) {
+        SQLAlterTableStatement stmt = (SQLAlterTableStatement) x.getParent();
+        String table = stmt.getName().toString();
+
+        for (SQLColumnDefinition column : x.getColumns()) {
+            String columnName = column.getName().toString();
+            addColumn(table, columnName);
+        }
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleAlterTableAddColumn x) {
+
+    }
 }