将表里的数据批量生成INSERT语句的存储过程增强版

有时候，我们需要将某个表里的数据全部或者根据查询条件导出来，迁移到另一个相同结构的库中

目前SQL Server里面是没有相关的工具根据查询条件来生成INSERT语句的，只有借助第三方工具（third party tools）

这种脚本网上也有很多，但是网上的脚本还是欠缺一些规范和功能，例如：我只想导出特定查询条件的数据，网上的脚本都是导出全表数据

如果表很大，对性能会有很大影响

这里有一个存储过程（适用于SQLServer2005 或以上版本）

-- Author: <桦仔>
-- Blog: <http://HdhCmsTestcnblogs测试数据/lyhabc/>
-- Create date: <//>
-- Description: <根据查询条件导出表数据的insert脚本>
-- =============================================
CREATE PROCEDURE InsertGenerator
(
@tableName NVARCHAR(MAX),
@whereClause NVARCHAR(MAX)
)
AS 
--Then it includes a cursor to fetch column specific information (column name and the data type thereof) 
--from information_schema.columns pseudo entity and loop through for building the INSERT and VALUES clauses 
--of an INSERT DML statement.
DECLARE @string NVARCHAR(MAX) --for storing the first half of INSERT statement
DECLARE @stringData NVARCHAR(MAX) --for storing the data (VALUES) related statement
DECLARE @dataType NVARCHAR(MAX) --data types returned for respective columns
DECLARE @schemaName NVARCHAR(MAX) --schema name returned from sys.schemas
DECLARE @schemaNameCount int--shema count
DECLARE @QueryString NVARCHAR(MAX) -- provide for the whole query, 
set @QueryString=' '
--如果有多个schema，选择其中一个schema
SELECT @schemaNameCount=COUNT(*)
FROM sys.tables t
INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
WHERE t.name = @tableName
WHILE(@schemaNameCount>)
BEGIN
--如果有多个schema，依次指定
select @schemaName = name 
from 
(
SELECT ROW_NUMBER() over(order by s.schema_id) RowID,s.name
FROM sys.tables t
INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
WHERE t.name = @tableName
) as v
where RowID=@schemaNameCount
--Declare a cursor to retrieve column specific information 
--for the specified table
DECLARE cursCol CURSOR FAST_FORWARD
FOR
SELECT column_name ,
data_type
FROM information_schema.columns
WHERE table_name = @tableName
AND table_schema = @schemaName
OPEN cursCol
SET @string = 'INSERT INTO [' + @schemaName + '].[' + @tableName + ']('
SET @stringData = ''
DECLARE @colName NVARCHAR()
FETCH NEXT FROM cursCol INTO @colName, @dataType
PRINT @schemaName
PRINT @colName
IF @@fetch_status <> 
BEGIN
PRINT 'Table ' + @tableName + ' not found, processing skipped.'
CLOSE curscol
DEALLOCATE curscol
RETURN
END
WHILE @@FETCH_STATUS = 
BEGIN
IF @dataType IN ( 'varchar', 'char', 'nchar', 'nvarchar' )
BEGIN
SET @stringData = @stringData + '''''''''+
isnull(' + @colName + ','''')+'''''',''+'
END
ELSE
IF @dataType IN ( 'text', 'ntext' ) --if the datatype 
--is text or something else 
BEGIN
SET @stringData = @stringData + '''''''''+
isnull(cast(' + @colName + ' as nvarchar(max)),'''')+'''''',''+'
END
ELSE
IF @dataType = 'money' --because money doesn't get converted 
--from varchar implicitly
BEGIN
SET @stringData = @stringData
+ '''convert(money,''''''+
isnull(cast(' + @colName
+ ' as nvarchar(max)),''.'')+''''''),''+'
END
ELSE
IF @dataType = 'datetime'
BEGIN
SET @stringData = @stringData
+ '''convert(datetime,''''''+
isnull(cast(' + @colName + ' as nvarchar(max)),'''')+''''''),''+'
END
ELSE
IF @dataType = 'image'
BEGIN
SET @stringData = @stringData + '''''''''+
isnull(cast(convert(varbinary,' + @colName + ') 
as varchar()),'''')+'''''',''+'
END
ELSE --presuming the data type is int,bit,numeric,decimal 
BEGIN
SET @stringData = @stringData + '''''''''+
isnull(cast(' + @colName + ' as nvarchar(max)),'''')+'''''',''+'
END
SET @string = @string + '[' + @colName + ']' + ','
FETCH NEXT FROM cursCol INTO @colName, @dataType
END
--After both of the clauses are built, the VALUES clause contains a trailing comma which needs to be replaced with a single quote. The prefixed clause will only face removal of the trailing comma.
DECLARE @Query NVARCHAR(MAX) -- provide for the whole query, 
-- you may increase the size
PRINT @whereClause
IF ( @whereClause IS NOT NULL
AND @whereClause <> ''
)
BEGIN 
SET @query = 'SELECT ''' + SUBSTRING(@string, , LEN(@string))
+ ') VALUES(''+ ' + SUBSTRING(@stringData, ,
LEN(@stringData) - )
+ '''+'')'' 
FROM ' +@schemaName+'.'+ @tableName + ' WHERE ' + @whereClause
PRINT @query
-- EXEC sp_executesql @query --load and run the built query
--Eventually, close and de-allocate the cursor created for columns information.
END
ELSE
BEGIN 
SET @query = 'SELECT ''' + SUBSTRING(@string, , LEN(@string))
+ ') VALUES(''+ ' + SUBSTRING(@stringData, ,
LEN(@stringData) - )
+ '''+'')'' 
FROM ' + @schemaName+'.'+ @tableName
END
CLOSE cursCol
DEALLOCATE cursCol
SET @schemaNameCount=@schemaNameCount-
IF(@schemaNameCount=)
BEGIN
SET @QueryString=@QueryString+@query
END
ELSE
BEGIN
SET @QueryString=@QueryString+@query+' UNION ALL '
END
PRINT convert(varchar(max),@schemaNameCount)+'---'+@QueryString
END
EXEC sp_executesql @QueryString --load and run the built query
--Eventually, close and de-allocate the cursor created for columns information.  

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