1. 解释什么是Oracle中的PRAGMA EXCEPTION_INIT PRAGMA EXCEPTION_INIT 是Oracle PL/SQL 中的一个指令,用于将一个用户定义的异常与 Oracle 预定义的异常或特定的错误代码关联起来。这允许开发者为特定的错误条件创建更具可读性和维护性的异常处理逻辑。 2. 阐述PRAGMA EXCEPTION_
The EXCEPTION_INIT pragma should only be used to associate an exception with an error number that is already meaningfully defined by Oracle. Note that any error number may be used by Oracle in the future, which can create conflicts with unrelated application use of that number. Negative intege...
可以使用该PRAGMA EXCEPTION_INIT名称将异常名称与其他可以预测的 Oracle 错误代码相关联。 知道错误代码后,可以将其用于PRAGMA EXCEPTION_INIT该错误,并专门为该错误编写处理程序。 每当尝试转换 PL/SQL 代码时不PRAGMA EXCEPTION_INIT在其参数部分中定义错误号,SSMA 将生成错误消息,因为它找不到数字文本。 必须传递一...
PRAGMA EXCEPTION_INIT将用户定义的错误代码与异常相关联。PRAGMA EXCEPTION_INIT声明可包含在任何块、子块或包中。只能在声明异常后将错误代码分配给该异常(使用PRAGMA EXCEPTION_INIT)。 语法 PRAGMA EXCEPTION_INIT声明的格式如下: PRAGMA EXCEPTION_INIT(exception_name, {exception_number | exception_code}) 其中: ...
PRAGMA EXCEPTION_INIT,PolarDB:PRAGMA EXCEPTION_INIT associates a user-defined error code with an exception. A PRAGMA EXCEPTION_INIT declaration may be included in any block, sub-block, or package. You can only assign an error code...
2.11.10 init #pragma init (f1[, f2…,fn]) 使实现在调用main()之前调用函数f1至fn(初始化函数)。此类函数的类型应为void,并且不接受任何参数,在开始执行时构造程序的内存映像时会调用这些函数。如果初始化函数在共享对象中,则在执行将共享对象放入内存的操作(无论是程序启动,还是某些动态装入操作,如dlopen()...
PRAGMA在PLSQL里有4个关键词的用法: (1)autonomous_transaction-自治事务,该程序块的commit或rollback不影响外层事务; (2)exception_init--错误代码与declare的标识符关联; (3)restrict_references--程序包的纯度级别; (4)serially_reusable--程序包级别的数据在引用之间不保留。 到目前... 查看原文 Oracle12c--...
For example, In PL/SQL, the pragma EXCEPTION_INIT tells the compiler to associate an exception name with an Oracle error number. === That allows you to refer to any internal exception by name and to write a specific handler for it.: DECLARE deadlock...
'## AddReference C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Data.OracleClient.dll '## AddReference "System.EnterpriseServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" You typically specify the assembly’s display name for assemblies stored in the GAC. Apply...
init--Marks a specified function as an initialization function. fini--Marks a specified function as a finalization function. ident--Places a specified string in the.commentsection of the executable. pack(n)--Controls the layout of structure offsets. The value ofnis a number--0, 1, 2, 4,...