PL/SQL程序有3种模式:IN (default),IN OUT,OUT (1)、IN 模式参数是一个常量 IN模式参数是一个常量必须被看作常量。下面的过程将不能编译成功以为第3行是一个IN模式变量 PROCEDURE print_next_value(v_data IN INTEGER) IS BEGIN v_data := v_data+1; -- compile error dbms_output.put_line(v_data...
In PL/SQL, we can pass parameters to procedures and functions in three ways. 1) IN type parameter:These types of parameters are used to send values to stored procedures. 2) OUT type parameter:These types of parameters are used to get values from stored procedures. This is similar to a r...
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This tutorial explains PL SQL Subprograms types mainly Procedures and Functions, different parameter passing methods, and how to create/delete Procedures and Functions in PL/SQL: In thePL SQL Operators And Control Statements Tutorialof thePL/SQL series, we learned about different PL SQL Operators an...
We will discuss packages in the chapter 'PL/SQL - Packages'.PL/SQL subprograms are named PL/SQL blocks that can be invoked with a set of parameters. PL/SQL provides two kinds of subprograms −Functions − These subprograms return a single value; mainly used to compute and return a ...
This Oracle tutorial explains how to create and drop procedures in Oracle / PLSQL with syntax and examples. In Oracle, you can create your own procedures. The syntax for a procedure is:
Chapter 16. Procedures, Functions,and Parameters Earlier parts of this book have explored in detail all of the components of the PL/SQL language: cursors, exceptions, loops, variables, and so on. While … - Selection from Oracle PL/SQL Programming, Thir
In this chapter, as the title suggests, you'll learn about the foundational structures of PL/SQL: blocks, functions, and procedures. Blocks define the structures upon which functions and procedures are built. Functions and procedures are very similar, but distinct, in that a function returns a...
Stored Program Units (Procedures, Functions, and Packages) A stored procedure, function, or package is a PL/SQL program unit that has the following features: Has a name. Can take parameters, and can return values. Is stored in the data dictionary. ...
Until Oracle 8.0, the Oracle RDBMS supported SQL and the stored procedure language PL/SQL. In Oracle 8.0, PL/SQL introducedexternal procedures, which allowed the capability of writing C functions as PL/SQL bodies. These C functions are callable directly from PL/SQL, and from SQL through PL/...