(从 SqlSmoObject 继承。) ExecutionContext 获取或设置用户定义函数的执行上下文。 ExecutionContextPrincipal 获取或设置用户定义函数的执行上下文主体。 ExtendedProperties 获取UserDefinedFunction 对象的扩展属性。 FunctionType 获取或设置用户定义函数类型。 ID 获取唯一标识用户定义函数的 ID 值。 ImplementationType 获取...
This means the user-defined function doesn't need to be reparsed and reoptimized with each use, resulting in much faster execution times. Common language runtime (CLR) functions offer significant performance advantage over Transact-SQL functions for computational tasks, string manipulation, and ...
用ALTER FUNCTION 命令也可以修改用户自定义函数。此命令的语法与CREATEFUNCTION 相同,因此使用ALTER FUNCTION 命令其实相当于重建了一个同名的函数,用起来不大方便。 另外,可以用DROP FUNCTION 命令删除用户自定义函数,其语法如下: DROP FUNCTION { [ owner_name. ] function_name } [ ,...n ] 例13-22: 删除...
为什么会有这种情况,这是因为SQL语句里面调用用户定义标量函数(UDF Scalar Function),都是逐行调用用户定义函数,这样需要为每行去提取用户定义函数的定义,然后去执行这些定义,从而导致了性能问题;更深层次的原因是因为函数采用了过程式的处理方法,而SQL Server查询数据则是基于数据集合的,这样在采用过程式的逐行处理时,S...
SQL SERVER中的用户定义函数(User Defined Functions 简称UDF)分为标量函数(Scalar-Valued Function)和表值函数(Table-Valued Function)。其中表值函数又分为Inline table-valued functions和Multistatement table-valued functions。 用户定义函数(UDF)在 SQL Server 中发挥重要的作用。用户定义函数可以用于执行复杂的逻辑...
Alter Updates any UserDefinedFunction object property changes on the instance of SQL Server. AlterImpl (繼承自 SqlSmoObject。) AlterImplFinish (繼承自 SqlSmoObject。) AlterImplInit (繼承自 SqlSmoObject。) AlterImplWorker (繼承自 SqlSmoObject。) AppendCommaText (繼承自 ScriptNameObjectBase。) Appe...
public SqlUserDefinedFunctionCreateUpdateParameters withOptions(Mapoptions) Set a key-value pair of options to be applied for the request. This corresponds to the headers sent with the request. Parameters: options- the options value to set
Faster execution.Similar to stored procedures, Transact-SQL user-defined functions reduce the compilation cost of Transact-SQL code by caching the plans and reusing them for repeated executions. This means the user-defined function doesn't need to be reparsed and reoptimized with each use, resulti...
User-defined functions can't make use of dynamic SQL or temp tables. Table variables are allowed. SET statements aren't allowed in a user-defined function. The FOR XML clause isn't allowed. User-defined functions can be nested; that is, one user-defined function can call another. The nes...
User-defined functions can't make use of dynamic SQL or temp tables. Table variables are allowed. SETstatements aren't allowed in a user-defined function. TheFOR XMLclause isn't allowed. User-defined functions can be nested; that is, one user-defined function can call another. The nesting...