分号分隔每一条语句,使用赋值操作符:=或SELECT INTO或FETCH INTO给每个变量赋值,执行部分的错误将在异常处理部分解决,在执行部分中可以使用另一个PL/SQL程序块,这种程序块被称为嵌套块。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...
·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...
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(...
Implicit Cursor: Oracle automatically generates it for a single SQL statement. Explicit Cursor: It is specified by the user for the complex queries. Example of using an explicit cursor DECLARE CURSOR emp_cursor IS SELECT employee_id, employee_name FROM employees; BEGIN FOR emp_record IN emp_cur...
PL/SQL executes multiple queries with a single command. Functions, procedures, triggers, and so on are kept in the database after generation for reuse. Applications developed in PL/SQL are portable to other OS and hardware. PL/SQL allows the use of loops, conditions, constants, variables, ...
Oracle SQL includes many extensions to the ANSI/ISO standard SQL language, and Oracle tools and applications provide additional statements. The Oracle tools SQL*Plus and Oracle Enterprise Manager let you run any ANSI/ISO standard SQL statement against an Oracle database, as well as additional ...
这种形式的ts_rewrite接受一个开始query和一个 SQL select命令,它们以一个文本字符串的形式给出。select必须得到tsquery类型的两列。对于select结果的每一行,在当前query值中出现的第一列值(目标)被第二列值(替补)所替换。例如: CREATE TABLE aliases (t tsquery PRIMARY KEY, s tsquery); INSERT INTO aliases VA...
ORDSとmod_plsqlは同等です。 PlsqlAuthenticationMode security.requestAuthenticationFunction アクセスできるように、使用する認証モードを指定します。 security.requestAuthenticationFunctionが指定されていない場合、ORDSの動作はmod_plsqlのBasicモードと同じです。 security.requestAuthenticationFunctionが指定され...
6EXCLUSIVEIt only allows executing queries on the locked table. Automatic Transaction Control In PL/SQL We can do configuration such that a COMMIT statement gets executed by default whenever an INSERT or DELETE statement is run. This is done by making the AUTOCOMMIT environment variable to ON. ...
PL/SQL is one of the core technologies at Oracle and is essential to leveraging the full potential of Oracle Database. PL/SQL combines the relational data access capabilities of the Structured Query Language with a flexible embedded procedural language, and it executes complex queries and programmat...