private String sql_select(String vendorName,String catalogName,String schemaName,String tableName,String tableAlias,ArrayList<String> columnNames,ArrayList<String> aliasNames,ArrayList<String> conditions,ArrayList<String> sortColumns,boolean isDistinct){
  return sql_select(vendorName,catalogName,schemaName,tableName,tableAlias,columnNames,aliasNames,null,null,null,null,conditions,sortColumns,isDistinct);
}

private String sql_select ( String vendorName , String catalogName , String schemaName , String tableName , String tableAlias , ArrayList < String > columnNames , ArrayList < String > aliasNames , ArrayList < String > conditions , ArrayList < String > sortColumns , boolean isDistinct ) { return sql_select ( vendorName , catalogName , schemaName , tableName , tableAlias , columnNames , aliasNames , null , null , null , null , conditions , sortColumns , isDistinct ) ; }
gets the database specific sql command to select records from a table
