DBMS_Utility学习

Comma_to_table

以下是例子：

DECLARE  v_len BINARY_INTEGER;  v_tab DBMS_UTILITY.UNCL_ARRAY;  v_idx BINARY_INTEGER;  v_str VARCHAR2(200);  BEGIN  DBMS_UTILITY.COMMA_TO_TABLE (    'a,b,c',  --每个元素必须符合Oracle命名规约，即：不能以数字开头    v_len,    v_tab);   v_idx := v_tab.FIRST;   WHILE(v_idx IS NOT NULL) LOOP      dbms_output.put_line(v_tab(v_idx));      v_idx := v_tab.NEXT(v_idx);   END LOOP;   dbms_utility.Table_to_Comma(v_tab, v_len, v_str);   dbms_output.put_line(v_str);END;

a
b
c

a,b,c

dbms_utility.GET_DEPENDENCY

取得数据库各对象之间依赖关系。给出一个例子演示：

CREATE VIEW SAL_SUMMARY_BY_DEPT AS SELECT DEPTNO, SUM(SAL) SAL FROM emp GROUP BY DEPTNO;EXEC dbms_utility.GET_DEPENDENCY('TABLE','SCOTT','EMP');

DEPENDENCIES ON SCOTT.EMP
------------------------------------------------------------------
*TABLE SCOTT.EMP()
*   VIEW SCOTT.SAL_SUMMARY_BY_DEPT()
也可以实用User_Dependencies(dba_dependencies, all_dependencies)来获取依赖关系
SELECT * FROM user_dependencies WHERE REFERENCED_NAME = 'EMP';

dbms_utility.get_hash_value

To get a hash value on a string where the hash value should be between 1000 and 3047, use 1000 as the base value and 2048 as the hash_size value. 
Using a power of 2 for the hash_size parameter works best.

SELECT DBMS_UTILITY.GET_HASH_VALUE('A', 0,2048) hash_value FROM dual;

dbms_util.get_cpu_time

返回值number类型，精确到百分之一秒。