7.3.1. Declaring Variables Several different types of variables may be defined in a PL/SQL block. You can use simple, scalar variables to hold numeric, character string, and date values. You can declare record variables that allow you to manipulate several related values together. You can even...
Chapter 1. Declaring Variables and Naming Elements Beginner Q: 1-1. The following variables are valid or invalid for these reasons: Valid. my_variable2 starts with a letter, is less than 31 … - Selection from Oracle PL/SQL Programming: A Developer's Wo
When declaring a CHAR or VARCHAR2 variable, to ensure that it can always hold n characters in anymultibyte character set, declare its length in characters—that is, CHAR(n CHAR) or VARCHAR2(n CHAR), where n does not exceed FLOOR(32767/4) = 8191. 可以通过下面一个PL/SQL代码来验证一下...
接下来我们看看PL/SQL中VARCHAR2变量类型,如下官方文档所示,它的最大字节长度为32767,所能容纳的字符个数取决于字符集。 Declaring Variables for Multibyte Characters The maximum size of a CHAR or VARCHAR2 variable is 32,767 bytes, whether you specify the maximum size in characters or bytes. The maximu...
Declaring RECORD variables A specific RECORD TYPE corresponding to a fixed number (and datatype) of underlying table columns can simplify the job of defining variables. Syntax: TYPE type_name IS RECORD (field_declaration,...); Options 'field_declaration' is defined as: ...
一、Declaring Collection Types 两种声明方法: 1.在 PL/SQL 中使用 TYPE 语句,如果定义在 package 中,对于使用该类型的用户要将 package 的 EXECUTE 权限授予该用户 2.对于 nested table type or VARRAY type 在 schema-level 使用 CREATE TYPE 命令,并将该类型的 EXECUTE 权限授予需要使用的用户 ...
Cancelling a cursor frees resources from the current fetch.The information currently in the associated private area is lost but the cursor remains open, parsed, and associated with its bind variables.Note: You cannot cancel cursors using Pro*C or PL/SQL.See Also: For more information about ...
There are three kinds of strings in PL/SQL: Fixed-length strings. The string is right-padded with spaces to the length specified in the declaration. (See ”Declaring String Variables,” to see padding in action.) Variable-length strings. A maximum length for the string is sp...
a cursor can be thought of as a name for a specific private SQL area. A PL/SQLcursor variableenables the retrieval of multiple rows from a stored procedure. Cursor variables allow you to pass cursors as parameters in your 3GL application. Cursor variables are described inPL/SQL User's Guide...
Create a PL/pgSQL cursor by declaring it as a variable of type refcursor. Examples of DECLARE a cursor Declare a cursor in PL/pgSQL to be used with any query. DECLARE c1 refcursor; The variable c1 is unbound since it isn’t bound to any particular query. ...