the dynamic PL/SQL block is an anonymous PL/SQL block that invokes a subprogram that has a formal parameter of the PL/SQL (but not SQL) data type RECORD. The record type is declared in a package specification, and the subprogram is declared in the package specification and defined in the...
为了将变量用作表名,我们需要构建动态SQL字符串,并使用EXECUTE IMMEDIATE来执行它。对于Cursor,我们可以使用SYS_REFCURSOR类型来接收动态查询的结果集。 3. 编写示例代码 下面是一个示例存储过程,它接受一个表名作为输入参数,并使用动态Cursor来查询该表的数据: sql CREATE OR REPLACE PROCEDURE dynamic_cursor_example(...
一个session cursor只能对应一个shared cursor,而一个shared cursor却可能同时对应多个session cursor。 当某个session cursor和其对应的shared cursor建立关联后,如果把cursor_space_for_time调成true,当一个session cursor处理完一条sql后,它就不会被destroy,Oracle会把其cache起来(我们称之为soft closed session curso...
dbms_sql.define_column(v_cursor, 2, v_no, 100); dbms_sql.define_column(v_cursor, 3, v_date); v_stat := dbms_sql.execute(v_cursor); --执行动态SQL语句。 LOOP EXIT WHEN dbms_sql.fetch_rows(v_cursor)<=0; --fetch_rows在结果集中移动游标,如果未抵达末尾,返回1。 dbms_sql.column_va...
1. Open cursor with a dynamic select statement SQL> SQL>CREATETABLE EMP (EMPNO NUMBER(4) NOT NULL, 2 ENAME VARCHAR2(10), 3 JOB VARCHAR2(9), 4 MGR NUMBER(4), 5 HIREDATE DATE, 6 SAL NUMBER(7, 2), 7 COMM NUMBER(7, 2), ...
This chapter shows you how to use Oracle Dynamic SQL, an advanced programming technique that adds flexibility and functionality to your applications. You will learn four methods for writing programs that accept and process SQL statements at run time. This chapter contains the following topics:...
dbms_sql.define_column(v_cursor, 2, v_no, 100);---字符的应该指定长度,否则会出现错误:PLS-00307: 有太多的 'DEFINE_COLUMN' 说明与此次调用相匹配 dbms_sql.define_column(v_cursor, 3, v_date); v_stat := dbms_sql.execute(v_cursor); --执行动态SQL语句。 LOOP...
2)、语法 fetch dynamic_cursor bulk collect into define_name[,define_name…]; 3)、处理多行查询语句 declare type empcurtyp is ref cursor; emp_cv empcurtyp; type ename_table_type is table of emp.ename%type index by binary_integer; ename_table ename_table_type; v_sql varchar2(100); beg...
Dbms_xplan.display_cursor 10046 trace Awrsqrpt.sql 1、PLSQL PL/SQLDeveloper,Navicat, Toad等客户端工具:很简单将 SQL 语句写出来,便可以使用 F5 查看执行计划了,不过需要注意缩进格式而且这个执行计划并不是真实计划,并没有实际执行此 SQL。这个工具更适合开发朋友们使用,这个就不用多说了。
dbms_sql.close_cursor(v_cursor);--关闭游标。 END; 结果: 3095;S051013XW00010;15-10月-05 3112;A051013XW00027;10-10月-05 3113;A051013XW00028;13-10月-05 3116;S051013XW00031;13-10月-05 Oracle DBMS_SQL Version 10.2 General Note:DMBS_SQL is the traditional form of dynamic SQL in Or...