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...
This example illustrates how you can create and use dynamic cursor in Oracle PL/SQL. The example is pretty simple, but I hope you can get the idea and apply it to more complicated cases. DECLARE t_cursorISREF CURSOR; my_cursor t_cursor; v_customer RECORD(customer_id NUMBER(18),amount ...
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...
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...
*** * 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...
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...
SQL多版本控制 - _CURSOR_OBSOLETE_THRESHOLD 在上一期的"恩墨讲堂"微信课中,我提到了一个控制SQL多版本的参数,有很多朋友讨论,这个参数是:_CURSOR_OBSOLETE_THRESHOLD 。 为什么会有这个参数呢?请看下面这个示意图,这是一个真实的生产环境,第一个SQL显示,其Version Count已经达到了26万个,这不仅仅占用了内存,...