Question

我想在动态sql中更新表。

declare
    x varchar2(10) := 'table_n';
begin
    execute immediate 'update :1 set column_n = 12345' using x;
end;

我得到ORA-00903：表名无效

但是

declare
    x varchar2(10) := 'table_n';
begin
    execute immediate 'update ' || x ||  ' set column_n = 12345';
end;

作品。

第一个解决方案有什么问题？

Answer 1

你不能在pl / sql

中对表名使用绑定变量

Answer 2

动态sql：

1.It generally uses the SQL statements at run time. (for the time which we don't have data at the compilation time).
2. The bind variable , in your query, `x`, uses it on runtime and execute the dynamic on run time. 
3. the bind variable refered by colon is used after USING clause.

点击此处获取更多信息：http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/dynamic.htm

Answer 3

Usage Notes

“....您不能使用绑定参数将模式对象的名称传递给动态SQL语句....”

动态sql - 使用表变量更新表

3 个答案: