我正在尝试在表格列表的基础上创建一堆表格，从另一个模式中提取其表名
示例
schA table1 schA table2 schA table3dbo tablelist在schema schA中包含此表
所以要么我需要一些代码说明 看看dbo tablelist验证它是否存在i 如果没有从数据库中的表中选择表结构到schB（这不存在）
我的问题是循环
我不是要求有人完全编写这段代码（尽管会有所帮助:-) 但如何构建我的查询或最佳启动方式
提前非常感谢
答案 0 :(得分：0)
这可能对你有所帮助 -
<强> DDL：
CREATE TABLE [dbo].[test1](
[company_id] [int] NOT NULL PRIMARY KEY,
[staff_name] [nvarchar](50) NULL,
[email] [nvarchar](50) NULL
) ON [PRIMARY]
<强>查询：
DECLARE
@table_name SYSNAME
, @name_for_new_table SYSNAME
, @schema_for_new_table SYSNAME
SELECT
@table_name = 'dbo.test1'
, @schema_for_new_table = 'dbo'
, @name_for_new_table = 'test1_new'
DECLARE @SQL NVARCHAR(MAX) = ''
;WITH tbl AS
(
SELECT o.[object_id]
FROM sys.objects o WITH (NOWAIT)
WHERE SCHEMA_NAME(o.[schema_id]) + '.' + o.name = @table_name
AND o.[type] = 'U'
AND o.is_ms_shipped = 0
),
index_column AS
(
SELECT
ic.[object_id]
, ic.index_id
, ic.is_descending_key
, ic.is_included_column
, c.name
FROM sys.index_columns ic WITH (NOWAIT)
JOIN sys.columns c WITH (NOWAIT) ON ic.[object_id] = c.[object_id] AND ic.column_id = c.column_id
WHERE ic.[object_id] IN (SELECT t.[object_id] FROM tbl t)
),
fk_columns AS
(
SELECT
k.constraint_object_id
, cname = c.name
, rcname = rc.name
FROM sys.foreign_key_columns k WITH (NOWAIT)
JOIN sys.columns rc WITH (NOWAIT) ON rc.[object_id] = k.referenced_object_id AND rc.column_id = k.referenced_column_id
JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = k.parent_object_id AND c.column_id = k.parent_column_id
)
SELECT @SQL = 'CREATE TABLE [' + @schema_for_new_table + '].[' + @name_for_new_table + ']' + CHAR(13) + '(' + CHAR(13) + STUFF((
SELECT DISTINCT CHAR(9) + ', [' + c.name + '] ' + UPPER(t.name) +
CASE WHEN t.name IN ('varchar', 'char', 'varbinary', 'binary', 'text')
THEN '(' + CASE WHEN c.max_length = -1 THEN N'MAX' ELSE CAST(c.max_length AS NVARCHAR(5)) END + ')'
WHEN t.name IN ('nvarchar', 'nchar', 'ntext')
THEN '(' + CASE WHEN c.max_length = -1 THEN N'MAX' ELSE CAST(c.max_length / 2 AS NVARCHAR(5)) END + ')'
WHEN t.name IN ('datetime2', 'time2', 'datetimeoffset')
THEN '(' + CAST(c.scale AS NVARCHAR(5)) + ')'
WHEN t.name = 'decimal'
THEN '(' + CAST(c.[precision] AS NVARCHAR(5)) + ',' + CAST(c.scale AS NVARCHAR(5)) + ')'
ELSE ''
END +
CASE WHEN c.collation_name IS NOT NULL THEN ' COLLATE ' + c.collation_name ELSE '' END +
CASE WHEN c.is_nullable = 1 THEN ' NULL' ELSE ' NOT NULL' END +
CASE WHEN c.[definition] IS NOT NULL THEN ' DEFAULT' + c.[definition] ELSE '' END +
CASE WHEN c.is_identity = 1 THEN ' IDENTITY(' + CAST(ISNULL(c.seed_value, '0') AS CHAR(1)) + ',' + CAST(ISNULL(c.increment_value, '1') AS CHAR(1)) + ')' ELSE '' END + CHAR(13)
FROM (
SELECT
c.name
, c.user_type_id
, c.max_length
, c.[precision]
, c.scale
, dc.[definition]
, ic.seed_value
, ic.increment_value
, c.collation_name
, c.is_nullable
, c.is_identity
FROM sys.columns c WITH (NOWAIT)
LEFT JOIN sys.default_constraints dc WITH (NOWAIT) ON c.default_object_id != 0 AND c.[object_id] = dc.parent_object_id AND c.column_id = dc.parent_column_id
LEFT JOIN sys.identity_columns ic WITH (NOWAIT) ON c.is_identity = 1 AND c.[object_id] = ic.[object_id] AND c.column_id = ic.column_id
WHERE c.[object_id] IN (SELECT o.[object_id] FROM tbl o)
) c
JOIN sys.types t WITH (NOWAIT) ON c.user_type_id = t.user_type_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, CHAR(9) + ' ')
+ ISNULL((SELECT CHAR(9) + ', CONSTRAINT [PK_' + @schema_for_new_table + '_' + @name_for_new_table + '] PRIMARY KEY (' +
(SELECT STUFF((
SELECT DISTINCT ', [' + c.name + ']' + CASE WHEN ic.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END
FROM sys.key_constraints k WITH (NOWAIT)
JOIN sys.index_columns ic WITH (NOWAIT) ON ic.[object_id] = k.parent_object_id AND ic.index_id = k.unique_index_id
JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = k.parent_object_id AND c.column_id = ic.column_id
WHERE k.[type] = 'PK'
AND ic.is_included_column = 0
AND k.parent_object_id IN (SELECT t.[object_id] FROM tbl t)
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')) + ')' + CHAR(13)), '')
+ ')' + CHAR(13)
+ ISNULL((SELECT (
SELECT CHAR(13) +
'ALTER TABLE [' + @schema_for_new_table + '].[' + @name_for_new_table + '] WITH'
+ CASE WHEN fk.is_not_trusted = 1
THEN ' NOCHECK'
ELSE ' CHECK'
END +
' ADD CONSTRAINT [FK_' + @schema_for_new_table + '_' + @name_for_new_table + '_' + fk.name + '] FOREIGN KEY('
+ STUFF((
SELECT ', [' + k.cname + ']'
FROM fk_columns k
WHERE k.constraint_object_id = fk.[object_id]
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')
+ ')' +
' REFERENCES [' + SCHEMA_NAME(ro.[schema_id]) + '].[' + ro.name + '] ('
+ STUFF((
SELECT ', [' + k.rcname + ']'
FROM fk_columns k
WHERE k.constraint_object_id = fk.[object_id]
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')
+ ')'
+ CASE
WHEN fk.delete_referential_action = 1 THEN ' ON DELETE CASCADE'
WHEN fk.delete_referential_action = 2 THEN ' ON DELETE SET NULL'
WHEN fk.delete_referential_action = 3 THEN ' ON DELETE SET DEFAULT'
ELSE ''
END
+ CASE
WHEN fk.update_referential_action = 1 THEN ' ON UPDATE CASCADE'
WHEN fk.update_referential_action = 2 THEN ' ON UPDATE SET NULL'
WHEN fk.update_referential_action = 3 THEN ' ON UPDATE SET DEFAULT'
ELSE ''
END
+ CHAR(13) + 'ALTER TABLE [' + @schema_for_new_table + '].[' + @name_for_new_table + '] CHECK CONSTRAINT [FK_' + @schema_for_new_table + '_' + @name_for_new_table + '_' + fk.name + ']' + CHAR(13)
FROM sys.foreign_keys fk WITH (NOWAIT)
JOIN sys.objects ro WITH (NOWAIT) ON ro.[object_id] = fk.referenced_object_id
WHERE fk.parent_object_id IN (SELECT t.[object_id] FROM tbl t)
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)')), '')
+ ISNULL(((SELECT
CHAR(13) + 'CREATE' + CASE WHEN i.is_unique = 1 THEN ' UNIQUE' ELSE '' END + ' NONCLUSTERED INDEX [IX_' + @schema_for_new_table + '_' + @name_for_new_table + '_' + i.name + '] ON [' + @schema_for_new_table + '].[' + @name_for_new_table + '] (' +
STUFF((
SELECT ', [' + c.name + ']' + CASE WHEN c.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END
FROM index_column c
WHERE c.is_included_column = 0
AND c.index_id = i.index_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '') + ')'
+ ISNULL(CHAR(13) + 'INCLUDE (' +
STUFF((
SELECT ', [' + c.name + ']'
FROM index_column c
WHERE c.is_included_column = 1
AND c.index_id = i.index_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '') + ')', '') + CHAR(13)
FROM sys.indexes i WITH (NOWAIT)
WHERE i.[object_id] IN (SELECT t.[object_id] FROM tbl t)
AND i.is_primary_key = 0
AND i.[type] = 2
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)')
), '')
PRINT @SQL
--EXEC sys.sp_executesql @SQL
<强>输出：
CREATE TABLE [dbo].[test1_new]
(
[company_id] INT NOT NULL
, [email] NVARCHAR(50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
, [staff_name] NVARCHAR(50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
, CONSTRAINT [PK_dbo_test1_new] PRIMARY KEY ([company_id] ASC)
)