根据库名获取所有表的信息

SELECT
    *
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = 'erp';

根据库名获取所有表名称和表说明

SELECT
    TABLE_NAME,
    TABLE_COMMENT
FROM
    information_schema.`TABLES`
WHERE
    TABLE_SCHEMA = 'erp';

view:

根据库名获取所有的字段信息

SELECT
    TABLE_SCHEMA AS '库名',
    TABLE_NAME AS '表名',
    COLUMN_NAME AS '列名',
    ORDINAL_POSITION AS '列的排列顺序',
    COLUMN_DEFAULT AS '默认值',
    IS_NULLABLE AS '是否为空',
    DATA_TYPE AS '数据类型',
    CHARACTER_MAXIMUM_LENGTH AS '字符最大长度',
    NUMERIC_PRECISION AS '数值精度(最大位数)',
    NUMERIC_SCALE AS '小数精度',
    COLUMN_TYPE AS 列类型,
    COLUMN_KEY 'KEY',
    EXTRA AS '额外说明',
    COLUMN_COMMENT AS '注释'
FROM
    information_schema.`COLUMNS`
WHERE
    TABLE_SCHEMA = 'erp'
ORDER BY
    TABLE_NAME,
    ORDINAL_POSITION;

view:

根据库名获取所有的库和表字段的基本信息

SELECT
    C.TABLE_SCHEMA AS '库名',
    T.TABLE_NAME AS '表名',
    T.TABLE_COMMENT AS '表注释',
    C.COLUMN_NAME AS '列名',
    C.COLUMN_COMMENT AS '列注释',
    C.ORDINAL_POSITION AS '列的排列顺序',
    C.COLUMN_DEFAULT AS '默认值',
    C.IS_NULLABLE AS '是否为空',
    C.DATA_TYPE AS '数据类型',
    C.CHARACTER_MAXIMUM_LENGTH AS '字符最大长度',
    C.NUMERIC_PRECISION AS '数值精度(最大位数)',
    C.NUMERIC_SCALE AS '小数精度',
    C.COLUMN_TYPE AS 列类型,
    C.COLUMN_KEY 'KEY',
    C.EXTRA AS '额外说明'
FROM
    information_schema.`TABLES` T
LEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAME
AND T.TABLE_SCHEMA = C.TABLE_SCHEMA
WHERE
    T.TABLE_SCHEMA = 'erp' 
ORDER BY
    C.TABLE_NAME,
    C.ORDINAL_POSITION;

view: 

Navicat目前查看数据库信息的方式并不友好，故想了另外一种方式，供参考，如下

执行存储过程

 CREATE PROCEDURE ShowTableDesc(tablename VARCHAR(200))

BEGIN
SELECT t2.*,t1.* FROM (select COLUMN_NAME as '字段',COLUMN_DEFAULT as '默认值',IS_NULLABLE as '允许为空',COLUMN_TYPE as '数据类型',
 COLUMN_COMMENT as '描述' from information_schema.columns
where table_schema =(select database() as databasename) and table_name = tablename) t1,
(select table_name as '表名',table_comment as '表描述' from information_schema.tables  where table_schema = (select database() as databasename) and table_name = tablename)
t2;
END

调用方式

call ShowTableDes('order');

ShowTableDes为存储过程名字，order 为表名。