如何在执行立即语句中包含变量？

Posted 2023-03-28

【中文标题】如何在执行立即语句中包含变量？

【英文标题】：How to include a variable in a execute immediate statement?

【发布时间】：2021-04-08 15:54:09

【问题描述】：

我试图在执行立即语句中选择一个变量，但是我不确定语法。

我试图运行的代码是这样的：

DECLARE
PREV_PAR VARCHAR2(1);
VC_NUM VARCHAR2(2);
BEGIN
SELECT 'P' INTO PREV_PAR FROM DUAL;
SELECT '01' INTO VC_NUM FROM DUAL;
EXECUTE IMMEDIATE 'CREATE TABLE TEMP_TABLE AS (SELECT '||PREV_PAR||' as prev_par,'||VC_NUM||'  as vc_code from dual)';
END;

我做错了什么？

【参考方案1】：

您需要再添加两个引号来包围您的每个 varchar 变量，如下所示。

DECLARE
PREV_PAR VARCHAR2(1);
VC_NUM VARCHAR2(2);
BEGIN
SELECT 'P' INTO PREV_PAR FROM DUAL;
SELECT '01' INTO VC_NUM FROM DUAL;
EXECUTE IMMEDIATE 'CREATE TABLE TEMP_TABLE AS (SELECT '''||PREV_PAR||''' as prev_par,'''||VC_NUM||'''  as vc_code from dual)';
END;
/

因为运行时的最终语句必须是这样的：

CREATE TABLE TEMP_TABLE AS (SELECT 'P' as prev_par, '01'  as vc_code from dual)

【讨论】：

感谢您的帮助。