In this chapter, we will discuss Variables in Pl/SQL. A variable is nothing but a name given to a storage area that our programs can manipulate. Each variable in PL/SQL has a specific data type, which determines the size and the layout of the variable's memory; the range of values th...
SQL> create table mytest(name varchar2(30),passwd varchar2(30)); 2、创建过程 SQL> create procedure sp_prol is begin --执行部分 insert into mytest('hjadsfhas','sdkhfdsj'); end; / 也可以使用(replace 表示如果有sp_prol就替换) SQL> create or replace procedure sp_prol is 2 begin 3...
他定义的变量在一个sqlplus连接中有效。 SQL> show user USER 为"YANGTK" SQL> var SP2-0568: 未说明结合变量。 SQL> var test number SQL> var 变量test 数据类型 NUMBER SQL> conn / as sysdba 已连接。 SQL> show user USER 为"SYS" SQL> var 变量test 数据类型 NUMBER SQL> ---...
PL/ SQL variable is the storage space location place in the memory which helps you to store the value of a particular type. We can store any kind of values inside the variable such as numbers, strings, Boolean or characters. The variable helps you to assign the name to a particular locat...
Oracle PL/SQL PL SQL Cursor Cursor Variables Introduction The query associated with a cursor variable can reference any variable in its scope. Changing the values of the variables later does not change the result set. The following code opens a cursor variable for a query that references th...
No run-time checking is performed to disallow null values in variables declared NOT NULL. See the following example, if your application needs to restrict null values in PL/SQL variables. DEFAULT Specifies a default value for the variable. This default is evaluated every time that the block is...
PL/SQL Variables Scope The scope of a variable is the block or blocks in which a PL/SQL variable is accessible. It means where it is declared and used. In PL/SQL variable scope is the block in which it is declared. The scope of a variable also extends to the nested blocks nested wi...
), 2850, null, 30); SQL> SQL> declare 2 v_emp_rec emp%ROWTYPE; 3 begin 4 v_emp_rec.sal:=500; -- LEGAL 5 end; 6 / PL/SQL procedure successfully completed. SQL> Related Topic %ROWTYPE Attribute %ROWTYPE Variable Does Not Inherit Initial Values or Constraints Record Variable that...
12 13PROCEDUREVARIABLE_LOCAL_SCOPE_TEST 14IS 15l_invoke_countNUMBER:=0; 16 17BEGIN 18l_invoke_count :=l_invoke_count+1; 19DBMS_OUTPUT.put_line(l_invoke_count); 20ENDVARIABLE_LOCAL_SCOPE_TEST; 21 22ENDPKG_GUCS; 在PL/SQL Developer中调用...
This section describes the declaration of variables in the PL/SQL and the scope of this variable in codes. Variable Declaration Figure 1shows the variable declaration syntax. Figure 1declare_variable::= The syntax is described as follows: