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Churchill Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot anticipate https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm all possible errors, you can plan to handle certain kinds of http://www.java2s.com/Code/VBA-Excel-Access-Word/Language-Basics/ChecktheerrornumberwithSelectCasestatement.htm errors meaningful to your PL/SQL program. With many programming languages, unless you disable error checking, a run-time error such as stack overflow or division by zero stops normal processing and returns control to the operating system. With PL/SQL, a mechanism called exception handling lets you on error "bulletproof" your program so that it can continue operating in the presence of errors. This chapter discusses the following topics: Overview of PL/SQL Error Handling Advantages of PL/SQL Exceptions Predefined PL/SQL Exceptions Defining Your Own PL/SQL Exceptions How PL/SQL Exceptions Are Raised How PL/SQL Exceptions Propagate Reraising a PL/SQL Exception Handling Raised PL/SQL Exceptions Tips for on error goto Handling PL/SQL Errors Overview of PL/SQL Error Handling In PL/SQL, a warning or error condition is called an exception. Exceptions can be internally defined (by the run-time system) or user defined. Examples of internally defined exceptions include division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. The other internal exceptions can be given names. You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. For example, you might define an exception named insufficient_funds to flag overdrawn bank accounts. Unlike internal exceptions, user-defined exceptions must be given names. When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system. User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions. To handle raised exceptions, you write separate routines called exception han
Resume«Language Basics«VBA / Excel / Access / WordVBA / Excel / Access / WordLanguage BasicsResumeCheck the error number with Select Case statement Sub SelectionSqrt() Dim cell As range Dim ErrMsg As String If TypeName(Selection) <> "Range" Then Exit Sub On Error GoTo ErrorHandler For Each cell In Selection cell.value = Sqr(cell.value) Next cell Exit Sub ErrorHandler: Select Case Err Case 5 'Negative number Resume Next Case 13 'Type mismatch Resume Next Case 1004 'Locked cell, protected sheet MsgBox "The cell is locked. Try again." Exit Sub Case Else ErrMsg = Error(Err.number) MsgBox "ERROR: " & ErrMsg Exit Sub End Select End Sub Related examples in the same category1.Uses a Resume statement after an error occurs:2.using the On Error Resume Next statementjava2s.com |Email:info at java2s.com|© Demo Source and Support. All rights reserved.