教你如何使用SQL提取数据库表名及字段名等信息
本文向大家介绍了使用SQL语句提取数据库所有表的表名、字段名的实例代码，在SQLserver 中进行了测试，具体内容如下：
–查询所有用户表所有字段的特征
SELECT D.Name as TableName, A.colorder AS ColOrder, A.name AS Name,
COLUMNPROPERTY(A.ID,A.Name, ‘IsIdentity’) AS IsIdentity,
CASE WHEN EXISTS
(SELECT 1
FROM dbo.sysobjects
WHERE Xtype = ‘PK’ AND Name IN
(SELECT Name
FROM sysindexes
WHERE indid IN
(SELECT indid
FROM sysindexkeys
WHERE ID = A.ID AND colid = A.colid)))
THEN 1 ELSE 0 END AS 主键,
B.name AS 类型,
A.length AS [长度],
A.xprec AS [精度],
A.xscale AS [小数],
CASE WHEN A.isnullable = 1 THEN 1 ELSE 0 END AS [可为空],
ISNULL(E.text, ‘ ‘) AS [默认值],
ISNULL(G.[value], ‘ ‘) AS [说明]
FROM dbo.syscolumns A LEFT OUTER JOIN
dbo.systypes B ON A.xtype = B.xusertype INNER JOIN
dbo.sysobjects D ON A.id = D.id AND D.xtype = ‘U’ AND
D.name <> ‘dtproperties’ LEFT OUTER JOIN
dbo.syscomments E ON A.cdefault = E.id
LEFT OUTER JOIN dbo.sysproperties G ON A.id = G.id AND A.colid = G.smallid
–WHERE D.Name=’tablename’ –如果找指定表,把注释去掉
ORDER BY 1, 2
——在SQLserver 2005中测试
–查询所有用户表所有字段的特征
SELECT
(case when a.colorder=1 then d.name else ” end) as 表名,–如果表名相同就返回空
a.colorder as 字段序号,
a.name as 字段名,
(case when COLUMNPROPERTY( a.id,a.name, ‘IsIdentity’ )=1 then ‘√’ else ” end) as 标识,
(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 ‘√’ else ” end) as 主键,–查询主键END
b.name as 类型,
a.length as 占用字节数,
COLUMNPROPERTY(a.id,a.name,’PRECISION’ ) as 长度,
isnull(COLUMNPROPERTY(a.id,a.name,’Scale’ ),0) as 小数位数,
(case when a.isnullable=1 then ‘√’ else ” end) as 允许空,
isnull(e.text,” ) as 默认值,
isnull(g.[value],” ) AS 字段说明
FROM syscolumns a left join systypes b
on a.xtype=b.xusertype
inner join sysobjects d
on a.id=d.id and d.xtype=’U’ 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=’PE_U_ValliMessage’ –所要查询的表
order by a.id,a.colorder
——提取某个表的字段名
SELECT
(case when a.colorder=1 then d.name else ” end) N’表名’,
a.colorder N’字段序号’,
a.name N’字段名’,
isnull(g.[value],”) AS N’字段说明’,
(case when COLUMNPROPERTY( a.id,a.name,’IsIdentity’)=1 then ‘√’else ”
end) N’标识’,
(case when (SELECT count(*)
FROM sysobjects
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 ‘√’ else ” end) N’主键’,
b.name N’类型’,
a.length N’占用字节数’,
COLUMNPROPERTY(a.id,a.name,’PRECISION’) as N’长度’,
isnull(COLUMNPROPERTY(a.id,a.name,’Scale’),0) as N’小数位数’,
(case when a.isnullable=1 then ‘√’else ” end) N’允许空’,
isnull(e.text,”) N’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.xtype=’U’ 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条件输入表名
where d.name=’ConsumeBillBody’
order by object_name(a.id),a.colorder
总结
本文向大家介绍了使用SQL语句提取数据库所有表的表名、字段名的实例代码，在SQLserver 中进行了测试，具体内容如下：
–查询所有用户表所有字段的特征
SELECT D.Name as TableName, A.colorder AS ColOrder, A.name AS Name,
COLUMNPROPERTY(A.ID,A.Name, ‘IsIdentity’) AS IsIdentity,
CASE WHEN EXISTS
(SELECT 1
FROM dbo.sysobjects
WHERE Xtype = ‘PK’ AND Name IN
(SELECT Name
FROM sysindexes
WHERE indid IN
(SELECT indid
FROM sysindexkeys
WHERE ID = A.ID AND colid = A.colid)))
THEN 1 ELSE 0 END AS 主键,
B.name AS 类型,
A.length AS [长度],
A.xprec AS [精度],
A.xscale AS [小数],
CASE WHEN A.isnullable = 1 THEN 1 ELSE 0 END AS [可为空],
ISNULL(E.text, ‘ ‘) AS [默认值],
ISNULL(G.[value], ‘ ‘) AS [说明]
FROM dbo.syscolumns A LEFT OUTER JOIN
dbo.systypes B ON A.xtype = B.xusertype INNER JOIN
dbo.sysobjects D ON A.id = D.id AND D.xtype = ‘U’ AND
D.name <> ‘dtproperties’ LEFT OUTER JOIN
dbo.syscomments E ON A.cdefault = E.id
LEFT OUTER JOIN dbo.sysproperties G ON A.id = G.id AND A.colid = G.smallid
–WHERE D.Name=’tablename’ –如果找指定表,把注释去掉
ORDER BY 1, 2
——在SQLserver 2005中测试
–查询所有用户表所有字段的特征
SELECT
(case when a.colorder=1 then d.name else ” end) as 表名,–如果表名相同就返回空
a.colorder as 字段序号,
a.name as 字段名,
(case when COLUMNPROPERTY( a.id,a.name, ‘IsIdentity’ )=1 then ‘√’ else ” end) as 标识,
(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 ‘√’ else ” end) as 主键,–查询主键END
b.name as 类型,
a.length as 占用字节数,
COLUMNPROPERTY(a.id,a.name,’PRECISION’ ) as 长度,
isnull(COLUMNPROPERTY(a.id,a.name,’Scale’ ),0) as 小数位数,
(case when a.isnullable=1 then ‘√’ else ” end) as 允许空,
isnull(e.text,” ) as 默认值,
isnull(g.[value],” ) AS 字段说明
FROM syscolumns a left join systypes b
on a.xtype=b.xusertype
inner join sysobjects d
on a.id=d.id and d.xtype=’U’ 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=’PE_U_ValliMessage’ –所要查询的表
order by a.id,a.colorder
——提取某个表的字段名
SELECT
(case when a.colorder=1 then d.name else ” end) N’表名’,
a.colorder N’字段序号’,
a.name N’字段名’,
isnull(g.[value],”) AS N’字段说明’,
(case when COLUMNPROPERTY( a.id,a.name,’IsIdentity’)=1 then ‘√’else ”
end) N’标识’,
(case when (SELECT count(*)
FROM sysobjects
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 ‘√’ else ” end) N’主键’,
b.name N’类型’,
a.length N’占用字节数’,
COLUMNPROPERTY(a.id,a.name,’PRECISION’) as N’长度’,
isnull(COLUMNPROPERTY(a.id,a.name,’Scale’),0) as N’小数位数’,
(case when a.isnullable=1 then ‘√’else ” end) N’允许空’,
isnull(e.text,”) N’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.xtype=’U’ 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条件输入表名
where d.name=’ConsumeBillBody’
order by object_name(a.id),a.colorder
总结
以上就是本文关于教你如何使用SQL提取数据库表名及字段名等信息的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站：几个比较重要的MySQL变量等，有什么问题可以随时留言，小编会及时回复大家的。感谢朋友们对本站的支持！
