sql - 可重新运行的脚本以将现有表中的可空列转换为不可空列

Question

我在下面找到了解决方案，但我需要使用 PL/SQL 存储过程来完成。

declare
  l_nullable varchar2(1);
begin
  select nullable into l_nullable
  from user_tab_columns
  where table_name = 'PV_REPORT_DETAILS'
  and   column_name = 'FEED_ID';

  if l_nullable = 'Y' then
    execute immediate 'alter table PV_REPORT_DETAILS modify (Feed_ID  not null)';
  end if;

  select nullable into l_nullable
  from user_tab_columns
  where table_name = 'PV_REPORT_DETAILS'
  and   column_name = 'CURRENT_RUN_ID';

  if l_nullable = 'Y' then
    execute immediate 'alter table PV_REPORT_DETAILS modify (Current_Run_ID not null)';
  end if;

  select nullable into l_nullable
  from user_tab_columns
  where table_name = 'PV_REPORT_DETAILS'
  and   column_name = 'PREVIOUS_RUN_ID';

  if l_nullable = 'Y' then
    execute immediate 'alter table PV_REPORT_DETAILS modify (Previous_Run_ID not null)';
  end if;
end;

Answer 1

看看 Oracle 的 CREATE PROCEDURE 语法。它应该是你正在寻找的东西。

http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6009.htm#i2072424

CREATE [OR REPLACE] PROCEDURE procedure_name
    [ (parameter [,parameter]) ]

IS
    [declaration_section]

BEGIN
    executable_section

[EXCEPTION
    exception_section]

END [procedure_name];

Answer 2

我认为作者想要一个使给定表中的所有可空列都不是空列的过程。试试这个解决方案：

CREATE TABLE my_test_table (
  id NUMBER NOT NULL,
  name VARCHAR2(20),
  salary NUMBER
);

DESC my_test_table;

名称空类型         
------ -------- ------------
ID 非空数字       
名称 VARCHAR2(20)
工资号码  

CREATE OR REPLACE PROCEDURE nullable_to_not_nullable(p_table_name IN VARCHAR2)
AS
  CURSOR c_list_nullable_columns IS
    SELECT column_name
      FROM user_tab_columns
    WHERE table_name = UPPER(p_table_name)
      AND nullable = 'Y';
BEGIN
  FOR v_rec IN c_list_nullable_columns
  LOOP
    EXECUTE IMMEDIATE 'ALTER TABLE ' || p_table_name || ' MODIFY (' || v_rec.column_name || ' NOT NULL)';
  END LOOP;
END nullable_to_not_nullable;
/

BEGIN
  nullable_to_not_nullable('my_test_table');
END;
/

DESC my_test_table;

名称空类型         
------ -------- ------------
ID 非空数字       
名称非空 VARCHAR2(20)
工资不为空数字