SQL extended to handle objects in SQL:1999 半结构化模型 节点的集合,每个节点都有数据和不同的模式 每个节点都包含对其自身内容的描述 可用于集成现有数据库 添加到文档的 XML 标签来描述结构 XML 标签标识文档中的元素、子元素、属性 用于定义结构的 XML DTD(文档类型定义)或 XML Schem Semi-structured Model...
DBMS_SCHEDULER 包提供一系列调度相关的存储过程及方法供 PL/SQL 调用。32.1 相关方法 32.1.1 SCHEDULE 对象 CREATE_SCHEDULE 过程 创建一个调度。语法如下:PROCEDURE DBMS_SCHEDULER.CREATE_SCHEDULE( SCHEDULE_NAME IN VARCHAR, START_DATE IN TIMESTAMP WITH TIME ZONE DEFAULT NULL, REPEAT_INTERVAL IN VARCHAR, ...
SQL 扩展到处理 SQL:1999 中的对象 Object-relational model Adds new complex datatypes to relational model Adds objects with attributes and methods Adds inheritance SQL extended to handle objects in SQL:1999 半结构化模型 节点的集合,每个节点都有数据和不同的模式 每个节点都包含对其自身内容的描述 可用...
DBMS_OUTPUT is a technology that many Oracle people will just assume you alreadygrok. It is a very basic building block for Oracle PLSQL programs. If you do not understand it, then your first attempts at scripting will likely be very frustrating. So in a nutshell from theOracle Docs– The...
DBMS_CRYPTO provides an interface to encrypt and decrypt stored data, and can be used in conjunction with PL/SQL programs running network communications. It provides support for several industry-standard encryption and hashing algorithms, including the Advanced Encryption Standard (AES) encryption algorit...
The DBMS_TRANSACTION package offers a number of programs you can use to issue rollbacks in your application. The DBMS_TRANSACTION.ROLLBACK procedure The ROLLBACK procedure is provided primarily for completelness. It is equivalent to the ROLLBACK command of PL/SQL. The header for this procedure...
Let’s look at a more ‘interesting’ chain, zoom in and out, and get an analysis of the chain dependencies and steps. Are your chains this pretty? Your simple ‘task’ running can quickly expand to a whole slew of programs running. The chain tools here can really help get a handle ...
SELECT * FROM user_scheduler_programs; 1.2 drop_program 参数说明: program_name——要删除的程序名称 force——true或者false。如果为true则不管该program是否被job引用都会删除,FALSE则若被引用无法删除,默认为false。 例子: BEGIN dbms_scheduler.drop_program(program_name => 'myprogram',force => TRUE); ...
TheDBMS_ROWIDpackage lets you createROWIDsand get information aboutROWIDsfrom PL/SQL programs and SQL statements. You can find the data block number, the object number, and other components of theROWIDwithout having to write code to interpret the base-64 character externalROWID. ...
虽然关系型数据库有很多,但是大多数都遵循SQL(结构化查询语言,Structured Query Language)标准。常见的操作有查询,新增,更新,删除,求和,排序等。 查询语句:SELECT param FROM table WHERE condition 该语句可以理解为从 table 中查询出满足 condition 条件的字段 param。 新增语句:INSERT INTO table (param1,param2,...