用Navicat导出数据库的数据字典

USE information_schema;


SELECT
    C.COLUMN_NAME AS '字段名',
    C.COLUMN_TYPE AS '数据类型',
    C.IS_NULLABLE AS '允许为空',
    C.EXTRA AS 'PK',
    C.COLUMN_COMMENT AS '字段说明',
        C.TABLE_NAME AS '表名'
FROM
    COLUMNS C
INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA
AND C.TABLE_NAME = T.TABLE_NAME
WHERE
    T.TABLE_SCHEMA = '数据库名称'   

也可以在where条件后面指定表名称

and T.TABLE_NAME='表名称'

查询出的结果可以导出