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...
3.Dyamic cursors in PL/SQL create or replace package dynamic_cursor is type t_crs isref cursor; procedure dyn_sel ( tab_name in varchar2, field_name in varchar2, val in varchar2, crs in out t_crs); procedure openCursor; end dynamic_cursor; / create or replace package body dynamic_...
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_value(v_cursor, 1, v_id);--将当前行的查询结果写入上面...
parentcursor包含了SQL TEXT和相关的hash value,v$sqlarea中的每一行代表了一个parent cursor,根据address表示了其内存地址。 childcursor包含了SQL的metadata,即使得这个SQL可以执行的所有相关信息,如OBJECT和权限,优化器设置,执行计划等。v$sql中中 的每一行表示了一个child cursor,根据hash value和address与parent curso...
*** * Sample Program 6: Dynamic SQL Method 1 * * * * This program uses dynamic SQL Method 1 to create a table, * * insert a row, commit the insert, then drop the table. * *** IDENTIFICATION DIVISION. PROGRAM-ID. DYNSQL1. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION...
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...
With Method 1, the SQL statement is parsed every time it is executed (regardless of whether you have set HOLD_CURSOR=YES). Method 2 This method lets your program accept or build a dynamic SQL statement, then process it using the PREPARE and EXECUTE commands. The SQL statement must not be...
Oracle存储过程中的游标(Cursor)详解 在Oracle数据库中,存储过程是一种强大的数据库对象,它允许我们封装一段SQL代码或PL/SQL代码块,并在需要时调用它。而游标(Cursor)则是存储过程中常用的一个技术,用于处理查询结果集。 一、游标的概念 游标是一种数据库处理技术,它允许我们在查询结果集出来之前对其进行处理和操作...
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...
本地动态SQL可以在pl/sql中直接执行,支持如下调用方法: EXECUTE IMMEDIATE OPEN-FOR FETCH CLOSE 使用EXECUTE IMMEDIATE 可以使用 EXECUTE IMMEDIATE 在本地运行动态SQL和匿名块: EXECUTEIMMEDIATEdynamic_string[INTO{diefine_variable[,define_variable]...|record}][USING[IN|OUT|INOUT]bind_argument[,[IN|OUT|INOUT...