MSSQL 获取数据库字段类型

 1 SELECT
 2    col.name AS 列名,
 3    typ.name as 数据类型,
 4    col.max_length AS 占用字节数,
 5    col.precision AS 数字长度,
 6    col.scale AS 小数位数,
 7    col.is_nullable  AS 是否允许非空,
 8    col.is_identity  AS 是否自增,
 9    case when exists 
10       ( SELECT 1 
11         FROM 
12           sys.indexes idx 
13             join sys.index_columns idxCol 
14             on (idx.object_id = idxCol.object_id)
15          WHERE
16             idx.object_id = col.object_id
17             AND idxCol.index_column_id = col.column_id
18             AND idx.is_primary_key = 1
19        ) THEN 1 ELSE 0 END  AS 是否是主键,
20   isnull(prop.[value],‘-‘) AS 说明
21 FROM
22   sys.columns col 
23     left join sys.types typ 
24       on (col.system_type_id = typ.system_type_id)
25     left join sys.extended_properties prop
26       on (col.object_id = prop.major_id AND prop.minor_id = col.column_id)
27 WHERE
28   col.object_id =
29     (SELECT object_id FROM sys.tables WHERE name = ‘band‘)