如何使用变量在动态查询中指定 IN 子句?

2021-12-24 00:00:00 sql oracle plsql dynamic-sql

在 PL/SQL 中，您可以使用连接指定 IN 运算符的值:

In PL/SQL, you can specify the values for the IN operator using concatenation:

v_sql := 'select field1
from table1
where field2 in (' || v_list || ')';

是否可以使用变量来做同样的事情?

Is it possible to do the same using a variable?

v_sql := 'select field1
from table1
where field2 in (:v_list)';

如果是，怎么做?

参考 Marcin 的回答，我如何从结果表中进行选择?

With reference to Marcin's answer, how do I select from the resultant table?

declare

cursor c_get_csv_as_tables is
select in_list(food_list) food_list
from emp_food
where emp_type = 'PERM';

cursor c_get_food_list (v_food_table varchar2Table)is
select *
from v_food_table;

begin
    for i in c_get_csv_as_tables loop
        for j in c_get_food_list(i.food_list) loop
            dbms_output.put_line(j.element);
        end loop;
    end loop;
end;

我收到以下错误:

ORA-06550: line 10, column 6:
PL/SQL: ORA-00942: table or view does not exist
ORA-06550: line 9, column 1:
PL/SQL: SQL Statement ignored
ORA-06550: line 15, column 34:
PLS-00364: loop index variable 'J' use is invalid
ORA-06550: line 15, column 13:
PL/SQL: Statement ignored

推荐答案

就像在@Sathya 链接中一样，您可以绑定 varray(我以@Codo 为例):

Like in @Sathya link, you can bind the varray (I took @Codo example): 

CREATE OR REPLACE TYPE str_tab_type IS VARRAY(10) OF VARCHAR2(200);
/
DECLARE
  l_str_tab str_tab_type;
  l_count NUMBER;
  v_sql varchar2(3000);
BEGIN
  l_str_tab := str_tab_type();
  l_str_tab.extend(2);
  l_str_tab(1) := 'TABLE';
  l_str_tab(2) := 'INDEX';

  v_sql := 'SELECT COUNT(*) FROM all_objects WHERE object_type IN (SELECT COLUMN_VALUE FROM TABLE(:v_list))';

  execute immediate v_sql into l_count using l_str_tab;

  dbms_output.put_line(l_count);
END;
/

UPDATE:第一个命令可以替换为:

UPDATE: the first command can be replaced with: 

CREATE OR REPLACE TYPE str_tab_type IS TABLE OF VARCHAR2(200);
    /

然后调用:

l_str_tab.extend(1);

当你添加一个值时

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