Terry的Blog

特性1: PL/SQL中 select into 一個(gè)變量和直接給這個(gè)個(gè)變量賦值效果不同.
DECLARE
    vTmp VARCHAR2(1000);
BEGIN
    SELECT to_char(sysdate,'EE','NLS_CALENDAR=''Japanese Imperial''') -- 年號(hào)
      INTO vTmp
      FROM dual;
END;

結(jié)果: PL/SQL procedure successfully completed

DECLARE
  vTmp VARCHAR2(1000);
BEGIN
  vTmp := to_char(sysdate,'EE','NLS_CALENDAR=''Japanese Imperial''');  -- vTmp := '平成'
END;

結(jié)果: ORA-06502: PL/SQL: 數(shù)値または値のエラーが発生しました
ORA-06512: 行4

特性2:用一個(gè)record變量直接修改表的記錄.record中字段和表的字段的對(duì)應(yīng)關(guān)系.
create table EMP
(
  EMPNO    NUMBER(4) not null,
  ENAME    VARCHAR2(10),
  JOB      VARCHAR2(9),
  MGR      NUMBER(4),
  HIREDATE DATE,
  SAL      NUMBER(7,2),
  COMM     NUMBER(7,2),
  DEPTNO   NUMBER(2)
)

create table EMP_2
(
  EMPNO    NUMBER(4) not null,
  JOB      VARCHAR2(9),
  ENAME    VARCHAR2(10),
  MGR      NUMBER(4),
  HIREDATE DATE,
  COMM     NUMBER(7,2),
  SAL      NUMBER(7,2),
  DEPTNO   NUMBER(2)
)

DECLARE
    rec EMP_2%ROWTYPE;
BEGIN
    SELECT *
      INTO rec
      FROM emp
     WHERE empno = 9999 ;
   
    INSERT INTO EMP_2 VALUES rec;
END;

EMP
    EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
1 9999 terry1 CLERK 7782 1982/01/23 1300.00  10

EMP_2
    EMPNO JOB ENAME MGR HIREDATE COMM SAL DEPTNO
1 9999 terry1 CLERK 7782 1982/01/23 1300.00  10

特性3:取日本年號(hào)

SELECT to_char(SYSDATE, 'EEYY MONTH DAY  MM/DD HH24:MI:SS', 'NLS_CALENDAR=''Japanese Imperial''') FROM dual
>>>
平成17 4月  火曜日  04/19 17:34:15