content: import net.sf.jsqlparser.expression.Alias;
  import net.sf.jsqlparser.expression.ExpressionVisitor;
  import net.sf.jsqlparser.schema.Table;
  import net.sf.jsqlparser.statement.select.Pivot;
  import net.sf.jsqlparser.util.deparser.SelectDeParser;
  
  public class DBSelectDeParser extends SelectDeParser {
  
      public DBSelectDeParser(ExpressionVisitor expressionVisitor, StringBuilder buffer){
          super(expressionVisitor, buffer);
      }
  
      @Override
      public void visit(Table tableName) {
          String schema = tableName.getSchemaName();
          String table = tableName.getName();
  
  //        if (fullTableName ==null){
  //            throw new SqlvpException("table is null");
  //        }
          tableName.setSchemaName("user");
          tableName.setName("age");
          StringBuilder buffer = getBuffer();
  
          buffer.append(tableName.getFullyQualifiedName());
          Pivot pivot = tableName.getPivot();
          if (pivot != null) {
              pivot.accept(this);
          }
          Alias alias = tableName.getAlias();
          if (alias != null) {
              buffer.append(alias);
          }
      }
  }