使用GOTO 陳述式: 建議謹慎使用 GOTO 陳述式。 此陳述式會干擾正常的 SQL 陳述式處理順序,因此使常式更難以讀取及維護。 在使用 GOTO 陳述式之前,請決定是否可以就地使用另一個陳述式 (例如 IF 或 LEAVE) ,以消除 GOTO 陳述式的需求。 對開啟游標的影響: 當 GOTO 陳述式將控制權轉移出複合陳述式時,除非宣告...
以下是包含 GOTO 语句的 SQL 过程的示例: CREATE PROCEDURE adjust_salary ( IN p_empno CHAR(6), IN p_rating INTEGER, OUT p_adjusted_salary DECIMAL (8,2) ) LANGUAGE SQL BEGIN DECLARE new_salary DECIMAL (9,2); DECLARE service DATE; -- start date SELECT salary, hiredate INTO v_new_salary...
This SQL Server tutorial explains how to use the GOTO statement in SQL Server (Transact-SQL) with syntax and examples. The GOTO statement causes the code to branch to the label after the GOTO statement.
BEGIN FOR i IN1..50LOOP IF done THEN GOTO end_loop; END IF; <<end_loop>> -- not allowed unless an executable statement follows NULL; -- add NULL statement to avoid error END LOOP; -- raises an error without the previous NULL END; 3、使用goto分出一个环绕块: 1 2 3 4 5 6 7 ...
GOTO statements are supported in anonymous blocks, FUNCTION, and PROCEDURE in plorasql. However, the use of GOTO has the following limitations Labels specifying jump locations must be defined before an executable statement or PL/oraSQL block. ...
The Transact-SQL statement or statements that follow GOTO are skipped and processing continues at the label. GOTO statements and labels can be used anywhere within a procedure, batch, or statement block. GOTO statements can be nested.Transact-SQL syntax conventions...
As the message suggests, this error message occurs when a label is used in a GOTO statement but the label is not defined anywhere within the script block or stored procedure. Here are a few examples of how this error is encountered: ...
GoToStatement 类型公开以下成员。 方法 展开表 名称说明 Accept Indicates the entry point for a given visitor. (覆盖 TSqlFragment.Accept(TSqlFragmentVisitor)。) AcceptChildren Calls Accept on the children with the given visitor. (覆盖 TSqlStatement.AcceptChildren(TSqlFragmentVisitor)。) Equals (从...
初始化GoToStatement類別的新執行個體。 命名空間:Microsoft.Data.Schema.ScriptDom.Sql 組件:Microsoft.Data.Schema.ScriptDom.Sql (在 Microsoft.Data.Schema.ScriptDom.Sql.dll 中) 語法 C# publicGoToStatement() .NET Framework 安全性 完全信任立即呼叫者。這個成員無法供部分信任的程式碼使用。如需詳細資訊,請...
PL/SQL允许我们在运行时决定循环的范围,如下例所示: SELECT COUNT(empno) INTO emp_count FROM emp; FOR i IN 1 .. emp_count LOOP ... END LOOP; emp_count在运行时是未知的;SELECT语句在运行时才返回结果值。 如果循环范围中的下界值超过上界值会怎样呢?如下例所示,循环内的语句序列就不会被执行,控制...