Mysql query table field structure annotation

Query the fields and comments of a table

select  COLUMN_NAME 字段名,
column_comment 字段说明,
column_type 字段类型,
column_key 约束 from information_schema.columns 
where table_schema = '数据库名'
and table_name = '表名' ; 

 

Query the comments of all tables and table fields under a certain database

SELECT
a.table_name 表名,
a.table_comment 表说明,
b.COLUMN_NAME 字段名,
b.column_comment 字段说明,
b.column_type 字段类型,
b.column_key 约束
FROM
information_schema. TABLES a
LEFT JOIN information_schema. COLUMNS b ON a.table_name = b.TABLE_NAME
WHERE
a.table_schema = '数据库名'
ORDER BY
a.table_name

Query all table names and table comments under a database

SELECT
table_name 表名,
table_comment 表说明
FROM
information_schema.TABLES
WHERE
table_schema = '数据库名'
ORDER BY
table_name