如何使用Oracle全局临时表? [英] How to use Oracle global temporary table?

问题描述

我正在尝试使用Oracle全局临时表，而不在数据库中实际创建表.以下代码无法正常工作.有人可以解释使用全局临时表的正确方法吗?

I am attempting to use an Oracle global temporary table without physically creating a table in the database. The following code is not working. Can someone please explain the proper way to use global temporary tables?

declare
  global temporary table my_temp_table(column1 number) on commit preserve rows;    
begin
  insert into my_temp_table (column1) values (1);
  select * from my_temp_table;   
end;

推荐答案

使用立即执行尝试以下操作:如果表已经存在，则使用异常处理程序绕过；否则，使用异常处理程序.还请注意，您不能在PLSQL中使用SQL select

Try the below using execute immediate: it uses exception handler to bypass if table already exists; also note that you cannot use SQL select inside PLSQL

DECLARE
  l_column1 number;
begin
  begin
    execute immediate 'create global temporary table my_temp_table(column1 number) 
on commit   preserve rows';
  exception when others
    then
    dbms_output.put_line(sqlerrm);
  end;
  insert into my_temp_table (column1) values (1);
  select * into l_column1 from my_temp_table where column1=1;
  dbms_output.put_line('the temp value is '||l_column1);   
end;

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