code: public void init(String tableName, ResultSet columnMetaRs) throws SQLException {
  		this.tableName = tableName;
  
  		this.name = columnMetaRs.getString("COLUMN_NAME");
  		this.type = columnMetaRs.getInt("DATA_TYPE");
  		this.size = columnMetaRs.getInt("COLUMN_SIZE");
  		this.isNullable = columnMetaRs.getBoolean("NULLABLE");
  		this.comment = columnMetaRs.getString("REMARKS");
  	}
docs: 初始化
  
  @param tableName 表名
  @param columnMetaRs 列的meta ResultSet
  @throws SQLException SQL执行异常