动态创建从表列表SQL表

Question

我试图创建一批在表列表中的模式的基表，从另一个架构

例如

SCHA表1 SCHA表2拉其表名 SCHA表3

DBO tablelist包含在架构上的表SCHA

所以无论我需要有一些代码，说 看看DBO tablelist VERI FY它存在我 如果不从数据库表中选择表结构为SCHB（其中并不存在）

我的问题是围绕

环路我不要求别人完全写代码（将是有益的，虽然:-) 但如何构建我的查询，或开始提前

超级感谢

Answer 1

最好的方式是这有助于你 -

DDL：

CREATE TABLE [dbo].[test1](
    [company_id] [int] NOT NULL PRIMARY KEY, 
    [staff_name] [nvarchar](50) NULL, 
    [email] [nvarchar](50) NULL 
) ON [PRIMARY] 

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 

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) 
)