查询数据库字段主键，外键，唯一键等相关属性
查询表相关主外键属性：主表，主表字段，外表，外表字段
SELECT *
FROM (
SELECT a.*,
b.fname
FROM (
SELECT OBJECT_NAME(rkeyid) rtable,
col.name rname,
OBJECT_NAME(fkeyid) ftable
FROM sysforeignkeys f
INNER JOIN syscolumns col
ON f.rkeyid = col.id
AND f.rkey = col.colid
) a
RIGHT JOIN (
SELECT OBJECT_NAME(rkeyid) rtable,
col.name fname,
OBJECT_NAME(fkeyid) ftable
FROM sysforeignkeys f
INNER JOIN syscolumns col
ON f.fkeyid = col.id
AND f.fkey = col.colid
) b
ON a.rtable = b.rtable
AND a.ftable = b.ftable
) a
ORDER BY
ftable
查询字段名，表名，架构名，序号，是否主键，是否外键，是否唯一键，是否为空，是否自动增长，默认值，字段类型，大小，长度，小数位数，相关属性
DECLARE @TableName VARCHAR(50)
SET @TableName = 'BuildingInfo'
SELECT a.*,
ISNULL(b.rtable, '0') AS RefTable,
ISNULL(b.rname, '0') AS RefName
FROM (
SELECT d.name AS TableName, --如果表名相同就返回空
a.colorder AS ID, --字段序号
a.name AS NAME, --字段名
(
CASE
WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') = 1 THEN
1
ELSE 0
END
) AS DbIdentity, --自动增长
(
CASE
WHEN (
SELECT COUNT(*)
FROM sysobjects--查询主键
WHERE (
NAME IN (SELECT NAME
FROM sysindexes
WHERE (id = a.id)
AND (
indid IN (SELECT
indid
FROM
sysindexkeys
WHERE (id = a.id)
AND (
colid IN (SELECT
colid
FROM
syscolumns
WHERE (id = a.id)
AND (NAME = a.name))
))
))
)
AND (xtype = 'PK')
) > 0 THEN 1
ELSE 0
END
) AS PK, --查询主键END
(
CASE
WHEN (
SELECT COUNT(*)
FROM (
SELECT OBJECT_NAME(f.fkeyid) AS
fname,
col.name,
f.constid AS temp
FROM syscolumns col,
sysforeignkeys f
WHERE f.fkeyid = col.id
AND f.fkey = col.colid
) ft
WHERE ft.fname = d.name
AND ft.name = a.name
) > 0 THEN 1
ELSE 0
END
) AS FK, --查询外键
(
CASE
WHEN (
SELECT COUNT(COLUMN_NAME)
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE CONSTRAINT_NAME IN (SELECT NAME
FROM sys.key_constraints
WHERE
OBJECT_NAME(parent_object_id) =
d.name
AND TYPE =
'UQ')
AND COLUMN_NAME = a.name
) > 0 THEN 1
ELSE 0
END
) AS UQ, --查询唯一键
b.name AS DbType, --字段类型
a.length AS DbLength, --占用字节数
(
SELECT TOP 1 TABLE_SCHEMA
FROM information_schema.COLUMNS
WHERE TABLE_NAME = d.name
) AS TableSchema, --架构
COLUMNPROPERTY(a.id, a.name, 'PRECISION') AS DbPrecision, -- 长度
ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) AS DbScale, -- 小数位数
(CASE WHEN a.isnullable = 1 THEN 1 ELSE 0 END) AS DbNull, --允许空
ISNULL(e.text, '') AS DefaultValue --默认值
FROM syscolumns a
LEFT JOIN systypes b
ON a.xtype = b.xusertype
INNER JOIN sysobjects d
ON a.id = d.id
AND d.name <> 'dtproperties'
LEFT JOIN syscomments e
ON a.cdefault = e.id
LEFT JOIN sys.extended_properties g
ON a.id = g.major_id
AND a.colid = g.minor_id
WHERE d.name LIKE @TableName --所要查询的表
)a
LEFT JOIN (
SELECT a.*,
b.fname
FROM (
SELECT OBJECT_NAME(rkeyid) rtable,
col.name rname,
OBJECT_NAME(fkeyid) ftable
FROM sysforeignkeys f
INNER JOIN syscolumns col
ON f.rkeyid = col.id
AND f.rkey = col.colid
AND OBJECT_NAME(fkeyid) = '表名'
) a
INNER JOIN (
SELECT OBJECT_NAME(rkeyid) rtable,
col.name fname,
OBJECT_NAME(fkeyid) ftable
FROM sysforeignkeys f
INNER JOIN syscolumns col
ON f.fkeyid = col.id
AND f.fkey = col.colid
AND OBJECT_NAME(fkeyid) = '表名'
) b
ON a.rtable = b.rtable
)b
ON a.tablename = b.ftable
AND a.name = b.fname
ORDER BY
REPLACE(a.Name, '_', '')