SELECT 
    TABLE_SCHEMA as `Database`, 
    TABLE_NAME as `Table`, 
    COLUMN_NAME as `Column`, 
    DATA_TYPE as `DataType`, 
    IS_NULLABLE as `IsNullable`, 
    COLUMN_DEFAULT as `Default`, 
      INFORMATION_SCHEMA.COLUMNS.CHARACTER_MAXIMUM_LENGTH  AS `LENGTH`, 
    COLUMN_COMMENT as `Comment`   
FROM     INFORMATION_SCHEMA.COLUMNS
WHERE   TABLE_SCHEMA = 'dbname'          -- 替换为你的数据库名
        and COLUMN_NAME like '%colname%' -- 替换为你的字段名