MySql数据库查询表信息/列信息(列ID/列名/数据类型/长度/精度/是否可以为null/默认值/是否自增/是否是主键/列描述)

查询表信息（表名/表描述）：

SELECT table_name name,TABLE_COMMENT value FROM INFORMATION_SCHEMA.TABLES WHERE table_type='base table' 
and  table_schema = '数据库名' order by table_name asc

查询列信息（列ID/列名/数据类型/长度/精度/是否可以为null/默认值/是否自增/是否是主键/列描述）：

方式一：

SHOW FULL COLUMNS FROM 表名

方式二：

select ORDINAL_POSITION as Colorder,Column_Name as ColumnName,data_type as TypeName,COLUMN_COMMENT as DeText,
(case when data_type = 'float' or data_type = 'double' or data_type = 'decimal' then  NUMERIC_PRECISION else CHARACTER_MAXIMUM_LENGTH end ) as length,
NUMERIC_SCALE as Scale,( case when EXTRA='auto_increment' then 1 else 0 end) as IsIdentity,(case when COLUMN_KEY='PRI' then 1 else 0 end) as IsPK,
(case when IS_NULLABLE = 'NO' then 0 else 1 end)as CanNull,COLUMN_DEFAULT as DefaultVal
from information_schema.columns where table_schema = '数据库名' and table_name = '表名' order by ORDINAL_POSITION asc