Oracle：仅将唯一记录插入复合触发器中的自定义记录

Question

我有一个以下格式的复合触发器。我需要确保我的自定义声明 ints_rows 只采用“唯一行”。意思是如果ints_rows 已经有一个类似于正在插入的记录，它应该忽略它。更像是一个 SET 数据结构。我如何在甲骨文中做到这一点？ （我对 oracle 很陌生，因此我不擅长语法）我认为我必须更改 BULK COLLECT 语句或 int_records 的声明，但我可能错了。非常感谢任何帮助/提示。

这是我的复合触发代码。

CREATE OR REPLACE
TRIGGER MY_COMPOUND_TRIGGER
FOR UPDATE OF some_random_column ON some_random_table
COMPOUND TRIGGER
  TYPE int_records IS RECORD (
    column_one another_table.column_one%TYPE,
    column_two another_table.column_two%TYPE
  );

  TYPE row_list IS TABLE OF int_records INDEX BY simple_integer;
  ints_rows row_list;

  BEFORE STATEMENT IS
  BEGIN
    ints_rows.delete;
  END BEFORE STATEMENT;

  AFTER EACH ROW IS
  BEGIN
    SELECT column_one, column_two BULK COLLECT INTO ints_rows 
      FROM some_table_x WHERE some_col_id=:OLD.some_col_id;
  END AFTER EACH ROW;

  AFTER STATEMENT IS
  BEGIN
    FOR i IN 1 .. ints_rows.COUNT LOOP
      -- DO SOMETHING
    END LOOP;

    auctions_rows.delete;
  END AFTER STATEMENT;
END;

此语句根本不应该重复。

SELECT column_one, column_two BULK COLLECT INTO ints_rows 
  FROM some_table_x WHERE some_col_id=:OLD.some_col_id;

Answer 1

在AFTER EACH ROW 部分中，您覆盖 整个ints_rows。原则上可能是这个：

CREATE TABLE SOME_RANDOM_TABLE (some_random_column NUMBER, some_col_id NUMBER);
CREATE TABLE ANOTHER_TABLE (column_one NUMBER, column_two NUMBER);
CREATE TABLE SOME_TABLE_X (some_col_id NUMBER, column_one NUMBER, column_two NUMBER);

CREATE OR REPLACE TYPE int_records AS OBJECT (
  column_one NUMBER,
  column_two NUMBER,
  MAP MEMBER FUNCTION getId RETURN VARCHAR2
);

CREATE OR REPLACE TYPE BODY int_records AS 
  MAP MEMBER FUNCTION getId RETURN VARCHAR2 IS
  BEGIN
     RETURN column_one ||','|| column_two;
  END getId;
END;
/

CREATE OR REPLACE TYPE row_list IS TABLE OF int_records; 


CREATE OR REPLACE TRIGGER MY_COMPOUND_TRIGGER
FOR UPDATE OF some_random_column ON SOME_RANDOM_TABLE
COMPOUND TRIGGER
      
  ints_rows row_list;

  BEFORE STATEMENT IS
  BEGIN
    ints_rows := row_list();
  END BEFORE STATEMENT;


  AFTER EACH ROW IS
    int_row row_list;
  BEGIN
    SELECT int_records(column_one, column_two) 
    BULK COLLECT INTO int_row 
    FROM SOME_TABLE_X  x
    WHERE x.some_col_id = :OLD.some_col_id;
    ints_rows := ints_rows MULTISET UNION DISTINCT int_row;
    
  END AFTER EACH ROW;

  AFTER STATEMENT IS
  BEGIN
    FOR i IN 1 .. ints_rows.COUNT LOOP
      NULL;
    END LOOP;

  END AFTER STATEMENT;

END;

请进行测试，如果它不起作用，请告诉我们。您可以使用循环手动区分记录，或者您需要为 RECORD 实现 MAP MEMBER FUNCTION。