Home Database Mysql Tutorial Oracle 11g Release 1 (11.1) PL/SQL_了解静态和动态 SQL

Oracle 11g Release 1 (11.1) PL/SQL_了解静态和动态 SQL

Jun 07, 2016 pm 05:15 PM

Oracle 11g Release 1 (11.1) PL/SQL_了解静态和动态 SQL ,若操作数据库的数据,则无需任何特别的符号,你可以直接在 PL/SQL 程

本文内容

  • 静态 SQL
  • 动态 SQL  
  • 静态 SQL

    静态 SQL 是属于 PL/SQL 语言的 SQL。也就是:

  • 除了解释执行计划的,数据操作语句(Data Manipulation Language,DML)
  • 事务控制(Transaction Control Language,,TCL)语句
  • SQL 函数
  • SQL 伪列
  • SQL 运算符
  • 静态 SQL 符合目前 ANSI/ISO SQL 标准。

    示例 1:演示用 PL/SQL 操作数据

    若操作数据库的数据,则无需任何特别的符号,你可以直接在 PL/SQL 程序里包含 DML 操作,如 INSERT、UPDATE 和 DELETE 语句。你也可以直接在 PL/SQL 程序里包含 COMMIT 语句。

    employee_id, first_name, last_name employees_temp WHERE employee_id = 299 RETURNING first_name, last_name INTO emp_first_name, emp_last_name; COMMIT; DBMS_OUTPUT.PUT_LINE( emp_first_name || ' ' || emp_last_name);END;/

    示例 2:演示在 PL/SQL 调用 SQL 函数——COUNT 函数

    (*) INTO emp_count FROM employees;END;/

    示例 3:演示使用伪列——ROWNUM

    * * FROM (SELECT employee_id, salary FROM employees_temp WHERE salary > 2000 ORDER BY salary DESC) WHERE ROWNUM -- first 5 rows, in sorted orderBEGIN-- Each row gets assigned a different number UPDATE employees_temp SET employee_id = ROWNUM;END;/

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