PL/SQL, which means Procedural Language/Structured Query Language, is a robust extension of SQL created by Oracle. This procedural language works well with SQL. It allows developers to build complex database applications that utilize the full strengths of Oracle Database. Being one of the three...
EXECUTE IMMEDIATE 代替了以前Oracle8i中DBMS_SQL package包.它解析并马上执行动态的SQL语句或非运行时创建的PL/SQL块.动态创建和执行SQL语句性能超前,EXECUTE IMMEDIATE的目标在于减小企业费用并获得较高的性能,较之以前它相当容易编码.尽管DBMS_SQL仍然可用,但是推荐使用EXECUTE IMMEDIATE,因为它获的收益在包之上。-- ...
The compile-timevalues of the parameters in Table1-2 are stored with the metadata of each stored PL/SQL unit, whichmeans that you can reuse those values when you explicitly recompile the unit.(A stored PL/SQL unit is created with one ofthe "CREATE[OR REPLACE] ...
whichmeans that you can reuse those values when you explicitly recompile the unit.(Astored PL/SQL unit is created with one ofthe"CREATE[OR REPLACE] Statements". An anonymous block is not a stored PL/SQLunit.)
本书介绍PL/SQL的新特性,包括数据类型和声明、扩展正则表达式、本地化代码生成、性能优化工具、分级优化器、动态SQL优化、PL/SQL表达式序列化等。内容涵盖语法、特性、最佳实践、最优化建议以及扩展代码。
PL/SQL - Basic Syntax - In this chapter, we will discuss the Basic Syntax of PL/SQL which is a block-structured language; this means that the PL/SQL programs are divided and written in logical blocks of code. Each block consists of three sub-parts ?
execute 为SQL命令,意为执行存储过程,immediate 为执行的存储过程名称。以下摘自MsSql帮助,别怪我复制哦,实在是帮助里描述的才最全面。EXECUTE执行标量值的用户定义函数、系统过程、用户定义存储过程或扩展存储过程。同时支持 Transact-SQL 批处理内的字符串的执行 若要唤醒调用函数,请使用 EXECUTE stored_procedure 中描...
【USER_PLSQL_OBJECT_SETTINGS】:Information about the characteristics—such as the optimization level and debug settings—of a PL/SQL object that can be modified through the ALTER and SET DDL commands. 【USER_PROCEDURES】: 包含关于存储程序信息,例如AUTHID设置,程序是定义为DETERMINISTIC等特性。
pl/sql中对于错误的处理是很重要的一个部分,就跟写程序中对于异常的处理一样。可能程序中正常的流程实现部分不是很复杂,但是对于各种可能发生的异常情况都需要面面俱到的处理要占一半以上的代码量。首先Pl/sql中的异常处理需要重视,但是异常的处理绝大多数的人写pl/sql
试验:PL/SQL程序块... 2 工作原理... 2 块嵌套... 2 10.3 声明... 3 10.3.1 变量和常量... 3 10.3.2 为变量和常量赋值... 5 10.3.3 可视性和作用域... 5 10.3.4 定义不确定内容,解释NULL. 7 10.3.5 使用%TYPE和%ROWTYPE. 8