PL/SQL Basic Syntax - Learn the essential PL/SQL basic syntax including variables, data types, and control structures to enhance your programming skills.
所有的SQL数据操作语句都可以用于执行部分,PL/SQL块不能在屏幕上显示SELECT语句的输出。SELECT语句必须包括一个INTO子串或者是游标的一部分,执行部分使用的变量和常量必须首先在声明部分声明,执行部分必须至少包括一条可执行语句,NULL是一条合法的可执行语句,事物控制语句COMMIT和ROLLBACK可以在执行部分使用,数据定义语言DDL...
PL/SQL Basic --PL/SQL块结构DECLARE/**定义部分-定义常量,变量,复杂数据类型,游标。 可选 没有;*/BEGIN/**执行部分-sql语句 必须 没有;*/EXCEPTION/**例外处理部分-处理运行错误 可选 没有;*/END;/*块结束标志 必须;*/setserveroutputonBEGINDBMS_OUTPUT.PUT_LINE('Hello');END;DECLAREv_enameVARCHAR(...
·函数:Create or replace function funcname(参数列表) return返回值as PL/SQL语句块 5.游标的定义为:用游标来指代一个DML SQL操作返回的结果集。即当一个对数据库的查询操作返回一组结果集时,用游标来标注这组结果集,以后通过对游标的操作来获取结果集中的数据信息。这里特别提出游标的概念,是因为它在PL/SQL...
This chapter covers basic reference material on how to write programs in PL/SQL and their examples. PL/SQL allows dependencies between commands within the same block of code. It also allows for parameter passing up and down code block hierarchies. PL/SQL contains a definition of variable scope...
PL/SQL - Basic Syntax PL/SQL - Data Types PL/SQL - Variables PL/SQL - Constants and Literals PL/SQL - Operators PL/SQL - Conditions PL/SQL - Loops PL/SQL - Strings PL/SQL - Arrays PL/SQL - Procedures PL/SQL - Functions PL/SQL - Cursors PL/SQL - Records PL/SQL - Exceptions ...
一.PL/SQL 定义 PL/SQL is theOracle Database procedural extension to SQL. PL/SQL is integrated with thedatabase, supporting all Oracle SQL statements, functions, and datatypes. Applications written in database APIs can invoke PL/SQL storedsubprograms and send PL/SQL code blocks ...
The programming statements that can be used in a PL/SQL application include: assignment, DELETE, EXECUTE IMMEDIATE, INSERT, NULL, SELECT INTO, and UPDATE.
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PL/SQL Block Structure A block is the most basic unit in PL/SQL. All PL/SQL programs are combined into blocks. These blocks can also be nested within one another. Usually, PL/SQL blocks combine statements that represent a single logical task. Therefore, different tasks within a single progr...