There are 3 ways to declare a constant in VBA. Each method has a differentscope. The first method only makes the constant available in the procedure (subroutine or function) where it’s declared. These are calledprocedure level constants. ...
Constant has the same scope asvariables. When you declare a constant, it has a procedure-level scope, which means you can use it anywhere within the procedure. But you can declare a constant using a private or public scope. A private constant is available only to the procedure where it is...
表变量的具体定义包括列定义,列名,数据类型和约束。而在表变量中可以使用的约束包括主键约束,唯一约束,NULL约束和CHECK约束(外键约束不能在表变量中使用)。定义表变量的语句是正常使用Create Table定义表语句的子集。只是表变量通过DECLARE @local_variable语句进行定义。 表变量的特征:表变量拥有特定...
你可以通过使用#Const来定义一个编译器常量,通过使用#If...Then...#Else来根据常量执行相应的代码。 ' Declare public compilation constant in Declarations section.#ConstconDebug = 1SubSelectiveExecution()#IfconDebug = 1Then.' Run code with debugging statements.. .#Else.' Run normal code.. .#EndIf...
作用是让sql语句具有程序的特性,以及面向对象的特性1.语法: declare //固定语法部分,单词意思为“声明”,意思为“声明头部” xxx xxx /*声明体。用于声明变量,变量类型分为普通变量声明、引用变量声明、 xxx xxx 记录变量声明、以及光标的声明*/ begin //固定语法部分,意...
Public Const MyString = "HELP" ' Declare Private Integer constant. Private Const MyInt As Integer = 5 ' Declare multiple constants on same line. Const MyStr = "Hello", MyDouble As Double = 3.4567Declare 在模块级别使用, 以声明对动态链接库(DLL) 中的外部过程的引用。
There are 3 levels at which we can declare or dimension (Dim) variables/constants. These are: Procedure-Level Module-Level (Private) Project-Level or Public Module-Level In each of these levels the variable/constant differs in scope and lifetime. This is discussed below: Procedure-Level - ...
You can't have fixed-length strings in the argument list of a Declare statement; only variable-length strings can be passed to procedures. Fixed-length strings can appear as procedure arguments, but they are converted to variable-length strings before being passed. The vbNullString constant is ...
Keyword used at the module level to declare constants that are available only within the module where the declaration is made. Not allowed in procedures. constname Required. Name of the constant; follows standard variable naming conventions. type Optional. Data type of the constant; may be Byte...
1、定义变量: declare @变量名 数据类型 (变量名开始必须是@)declare @a int ; 2、赋值:方法1:set @变量名= 值(不推荐); 方法2:select @变量名= 值;declare @a nvarchar(10);set @a='aaa'select @a='aaa'3、取值打印:方法1:select 值/@变量名——映射到结果集方法2:print mysql函数sql赋值给...