有没有办法以编程方式确定SQL Server存储过程参数是否具有默认值? (如果您可以确定默认值是什么,则可以获得奖励。)SqlCommandBuilder.DeriveParameters()甚至没有尝试。
提前感谢您的帮助!
编辑:老实说,我不关心它是SQL查询,SMO对象等。答案 0 :(得分:14)
我找到了一种使用SMO的方法:
Server srv;
srv = new Server("ServerName");
Database db;
db = srv.Databases["MyDatabase"];
var Params = db.StoredProcedures["MyStoredProc"].Parameters;
foreach(StoredProcedureParameter param in Params) {
Console.WriteLine(param.Name + "-" + param.DefaultValue);
}
答案 1 :(得分:6)
在SQL Server 2005及以上版本中没什么大不了的:
SELECT
pa.NAME,
t.name 'Type',
pa.max_length,
pa.has_default_value,
pa.default_value
FROM
sys.parameters pa
INNER JOIN
sys.procedures pr ON pa.object_id = pr.object_id
INNER JOIN
sys.types t ON pa.system_type_id = t.system_type_id
WHERE
pr.Name = 'YourStoredProcName'
击> <击> 撞击>
不幸的是,即使这看起来像小蛋糕 - 它也不起作用: - (
来自Technet:
SQL Server 仅维护默认 此目录中的 CLR对象的值 视图;因此,这个专栏有一个 Transact-SQL对象的值为0 。 查看a的默认值 Transact-SQL对象中的参数, 查询的定义列 sys.sql_modules目录视图,或使用 OBJECT_DEFINITION系统功能。
所以你所能做的就是查询sys.sql_modules
或调用SELECT object_definition(object_id)
来基本上获取存储过程的SQL定义(T-SQL源代码),然后你需要解析那个(糟透了!大时间......)
似乎没有其他方法可以做到这一点...我很惊讶并且应用......
也许在SQL Server 2008 R2中? :-) 马克
答案 2 :(得分:1)
运行内置sp_help存储过程?
答案 3 :(得分:1)
对于存储过程,我相信您必须编写解析T-SQL或Microsoft提供的use the T-SQL parser的内容。
解析器和脚本生成器正常运行 在两个集会中。该
Microsoft.Data.Schema.ScriptDom
包含提供者不可知的类和 该Microsoft.Data.Schema.ScriptDom.Sql
程序集包含用于的类 解析器和脚本生成器 SQL Server特定。
如何专门使用它来识别参数以及它们是否默认不会被覆盖,并且您将需要使用示例代码进行处理(可能需要付出一些努力)。
答案 4 :(得分:1)
这是一种黑客行为,但您可以随时为可选参数提供一个特殊名称,如:
@AgeOptional = 15
...然后编写一个简单的方法来检查参数是否可选。不理想,但鉴于这种情况,它实际上可能是一个不错的解决方案。
答案 5 :(得分:1)
这就是我做到的。从第一个参数开始直到AS语句,获取存储过程的一部分。使用declare语句创建一个临时存储过程,并返回所有参数id,名称,列类型(如果它们具有默认值)及其值的并集。然后执行存储过程,假设它们具有默认值的参数之间是否有相等的符号,如果它们没有默认值,我在执行期间将null传递给参数,并且读取结果集或者如果存在则填充存储过程一个临时表,以便我以后可以查询它。我检查了参数之间是否有任何相同的符号,如果是,最初我认为它们有默认值。如果有等号的注释等过程,这意味着它们没有默认值,在执行过程中我没有传递任何参数,执行失败,我抓到了错误信息,读取了参数名称并执行了这次我通过的程序null到参数。在程序中我使用了CLR字符串concat函数,因此如果直接执行它将无法编译,但你可以用XML路径替换,或者给我发回电子邮件,如果你想要我可以引导你完成clr 。因为我联合所有参数,我把它们作为varchar(max)
USE Util
GO
CREATE AGGREGATE [dbo].[StringConcat]
(@Value nvarchar(MAX), @Delimiter nvarchar(100))
RETURNS nvarchar(MAX)
EXTERNAL NAME [UtilClr].[UtilClr.Concat]
GO
CREATE FUNCTION dbo.GetColumnType (@TypeName SYSNAME,
@MaxLength SMALLINT,
@Precision TINYINT,
@Scale TINYINT,
@Collation SYSNAME,
@DBCollation SYSNAME)
RETURNS TABLE
AS
RETURN
SELECT CAST(CASE WHEN @TypeName IN ('char', 'varchar')
THEN @TypeName + '(' + CASE WHEN @MaxLength = -1 THEN 'MAX'
ELSE CAST(@MaxLength AS VARCHAR)
END + ')' + CASE WHEN @Collation <> @DBCollation THEN ' COLLATE ' + @Collation
ELSE ''
END
WHEN @TypeName IN ('nchar', 'nvarchar')
THEN @TypeName + '(' + CASE WHEN @MaxLength = -1 THEN 'MAX'
ELSE CAST(@MaxLength / 2 AS VARCHAR)
END + ')' + CASE WHEN @Collation <> @DBCollation THEN ' COLLATE ' + @Collation
ELSE ''
END
WHEN @TypeName IN ('binary', 'varbinary') THEN @TypeName + '(' + CASE WHEN @MaxLength = -1 THEN 'MAX'
ELSE CAST(@MaxLength AS VARCHAR)
END + ')'
WHEN @TypeName IN ('bigint', 'int', 'smallint', 'tinyint') THEN @TypeName
WHEN @TypeName IN ('datetime2', 'time', 'datetimeoffset') THEN @TypeName + '(' + CAST (@Scale AS VARCHAR) + ')'
WHEN @TypeName IN ('numeric', 'decimal') THEN @TypeName + '(' + CAST(@Precision AS VARCHAR) + ', ' + CAST(@Scale AS VARCHAR) + ')'
ELSE @TypeName
END AS VARCHAR(256)) AS ColumnType
GO
go
USE [master]
GO
IF OBJECT_ID('dbo.sp_ParamDefault') IS NULL
EXEC('CREATE PROCEDURE dbo.sp_ParamDefault AS SELECT 1 AS ID')
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE dbo.sp_ParamDefault
@ProcName SYSNAME = NULL OUTPUT
AS
SET NOCOUNT ON
SET ANSI_WARNINGS OFF
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
DECLARE @SQL VARCHAR(MAX),
@ObjectId INT = OBJECT_ID(LTRIM(RTRIM(@ProcName))),
@FirstParam VARCHAR(256),
@LastParam VARCHAR(256),
@SelValues VARCHAR(MAX),
@ExecString VARCHAR(MAX),
@WhiteSpace VARCHAR(10) = '[' + CHAR(10) + CHAR(13) + CHAR(9) + CHAR(32) + ']',
@TableExists BIT = ABS(SIGN(ISNULL(OBJECT_ID('tempdb..#sp_ParamDefault'), 0))),
@DeclareSQL VARCHAR(MAX),
@ErrorId INT,
@ErrorStr VARCHAR(MAX)
IF @ObjectId IS NULL
BEGIN
SET @ProcName = NULL
PRINT '/* -- SILENCE OPERATION --
IF OBJECT_ID(''tempdb..#sp_ParamDefault'') IS NOT NULL DROP TABLE #sp_ParamDefault
CREATE TABLE #sp_ParamDefault (Id INT, NAME VARCHAR(256), TYPE VARCHAR(256), HasDefault BIT, IsOutput BIT, VALUE VARCHAR(MAX))
*/
EXEC dbo.sp_ParamDefault
@ProcName = NULL
'
RETURN
END
SELECT @SQL = definition,
@ProcName = QUOTENAME(OBJECT_SCHEMA_NAME(@ObjectId)) + '.' + QUOTENAME(OBJECT_NAME(@ObjectId)),
@FirstParam = FirstParam,
@LastParam = LastParam
FROM sys.all_sql_modules m (NOLOCK)
CROSS APPLY (SELECT MAX(CASE WHEN p.parameter_id = 1 THEN p.name
END) AS FirstParam,
Util.dbo.StringConcat(p.name, '%') AS Params
FROM sys.parameters p (NOLOCK)
WHERE p.object_id = m.OBJECT_ID) p
CROSS APPLY (SELECT TOP 1
p.NAME AS LastParam
FROM sys.parameters p (NOLOCK)
WHERE p.object_id = m.OBJECT_ID
ORDER BY parameter_id DESC) l
WHERE m.object_id = @ObjectId
IF @FirstParam IS NULL
BEGIN
IF @TableExists = 0
SELECT CAST(NULL AS INT) AS Id,
CAST(NULL AS VARCHAR(256)) AS Name,
CAST(NULL AS VARCHAR(256)) AS Type,
CAST(NULL AS BIT) AS HasDefault,
CAST(NULL AS VARCHAR(MAX)) AS VALUE
WHERE 1 = 2
RETURN
END
SELECT @DeclareSQL = SUBSTRING(@SQL, 1, lst + AsFnd + 2) + '
'
FROM (SELECT PATINDEX ('%' + @WhiteSpace + @LastParam + @WhiteSpace + '%', @SQL) AS Lst) l
CROSS APPLY (SELECT SUBSTRING (@SQL, lst, LEN (@SQL)) AS SQL2) s2
CROSS APPLY (SELECT PATINDEX ('%' + @WhiteSpace + 'AS' + @WhiteSpace + '%', SQL2) AS AsFnd) af
DECLARE @ParamTable TABLE (Id INT NOT NULL,
NAME SYSNAME NULL,
TYPE VARCHAR(256) NULL,
HasDefault BIGINT NULL,
IsOutput BIT NOT NULL,
TypeName SYSNAME NOT NULL) ;
WITH pr
AS (SELECT p.NAME COLLATE SQL_Latin1_General_CP1_CI_AS AS ParameterName,
p.Parameter_id,
t.NAME COLLATE SQL_Latin1_General_CP1_CI_AS AS TypeName,
ct.ColumnType,
MAX(Parameter_id) OVER (PARTITION BY (SELECT 0)) AS MaxParam,
p.is_output
FROM sys.parameters p (NOLOCK)
INNER JOIN sys.types t (NOLOCK) ON t.user_type_id = p.user_type_id
INNER JOIN sys.databases AS db (NOLOCK) ON db.database_id = DB_ID()
CROSS APPLY Util.dbo.GetColumnType(t.name, p.max_length, p.precision, p.scale, db.collation_name, db.collation_name) ct
WHERE OBJECT_ID = @ObjectId)
INSERT @ParamTable
(Id,
NAME,
TYPE,
HasDefault,
IsOutput,
TypeName)
SELECT Parameter_id AS Id,
ParameterName AS NAME,
ColumnType AS TYPE,
HasDefault,
is_output AS IsOutput,
TypeName
FROM pr a
CROSS APPLY (SELECT ISNULL('%' + (SELECT Util.dbo.StringConcat (ParameterName, '%') FROM pr b WHERE b.parameter_id < a.parameter_id), '') + '%'
+ ParameterName + '%=' + '%' + CASE WHEN parameter_id = MaxParam THEN @WhiteSpace + 'AS' + @WhiteSpace + '%'
ELSE (SELECT Util.dbo.StringConcat (ParameterName, '%') FROM pr b
WHERE b.parameter_id > a.parameter_id) + '%'
END AS ptt) b
CROSS APPLY (SELECT SIGN (PATINDEX (ptt, @DeclareSQL)) AS HasDefault) hd
AGAIN:
SELECT @SelValues = CASE WHEN @TableExists = 1 THEN 'INSERT #sp_ParamDefault(Id, Name, Type, HasDefault, IsOutput, Value)
' ELSE ''
END + 'SELECT * FROM (VALUES' + Util.dbo.StringConcat('(' + CAST(Id AS VARCHAR) + ', ''' + Name + ''', ''' + Type + ''', '
+ CAST(HasDefault AS VARCHAR) + ', ' + CAST(IsOutput AS VARCHAR) + ', '
+ CASE WHEN TypeName NOT LIKE '%char%' THEN 'CAST(' + name + ' AS VARCHAR(MAX))'
ELSE name
END + ')', ',
') + '
) d(Id, Name, Type, HasDefault, IsOutput, Value)',
@ExecString = 'EXEC #sp_ParamDefaultProc
' + ISNULL(Util.dbo.StringConcat(CASE WHEN HasDefault = 0 THEN Name + ' = NULL'
END, ',
'), '')
FROM @ParamTable
SET @SQL = 'CREATE PROCEDURE #sp_ParamDefaultProc
' + SUBSTRING(@DeclareSQL, CHARINDEX(@FirstParam, @DeclareSQL), LEN(@DeclareSQL)) + '
' + @SelValues
IF OBJECT_ID('TEMPDB..#sp_ParamDefaultProc') IS NOT NULL
DROP PROCEDURE #sp_ParamDefaultProc
EXEC(@SQL)
BEGIN TRY
EXEC(@ExecString)
END TRY
BEGIN CATCH
SELECT @ErrorStr = ERROR_MESSAGE(),
@ErrorId = ERROR_NUMBER()
-- there must have been a comment containing equal sign between parameters
UPDATE p
SET HasDefault = 0
FROM (SELECT PATINDEX ('%expects parameter ''@%', @ErrorStr) AS ii) i
CROSS APPLY (SELECT CHARINDEX ('''', @ErrorStr, ii + 20) AS uu) u
INNER JOIN @ParamTable p ON p.name = SUBSTRING(@ErrorStr, ii + 19, uu - ii - 19)
WHERE ii > 0
IF @@ROWCOUNT > 0
GOTO AGAIN
RAISERROR(@ErrorStr, 16, 1)
RETURN 30
END CATCH
GO
EXEC sys.sp_MS_marksystemobject
sp_ParamDefault
GO
答案 6 :(得分:1)
这是PowerShell中的SMO答案:
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.Smo") | out-null
$srv = New-Object "Microsoft.SqlServer.Management.Smo.Server" "MyServer\MyInstance"
$db = $srv.Databases["MyDatabase"];
$proc = $db.StoredProcedures["MyStoredProcedure"]
foreach($parameter in $proc.Parameters) {
if ($parameter.DefaultValue){
Write-Host "$proc , $parameter , $($parameter.DefaultValue)"
}
else{
Write-Host "$proc , $parameter , No Default Value"
}
}