ORACLE变量定义及使用(另,T-SQL EXISTS的PLSQL替代写法)

1. 简单变量
declare v_cnt NUMBER(10,0) := 0;
BEGIN
  SELECT COUNT(1) INTO v_cnt FROM concept.Decoction WHERE DecoctionId = -1;
  IF v_cnt = 0 THEN
   insert into concept.Decoction( DecoctionId, Code, Name, MnemonicCode, SpellCode, WBCode, ClinicItemId, IsSpecial, IsDeleted, RowVersion, IsNeedAccount ) values
     ( -1, NULL, NULL, Null, NULL, NULL, -1, 0, 0, SYSDATE, 0 );
  END IF;
END;
 
2. 以表的字段类型定义的变量
create table DBO.TEST_TBL
  (
    ID NUMBER(10) NOT NULL PRIMARY KEY
  );
declare v_cnt CONCEPT.decoction.DecoctionId%type := 0;
BEGIN
  SELECT DecoctionId INTO v_cnt FROM concept.Decoction WHERE DecoctionId = -1;
  INSERT INTO DBO.TEST_TBL SELECT v_cnt from dual;
END;
select * from DBO.TEST_TBL;
 
3. 以表的行定义的变量
drop table DBO.TEST_TBL;
create table DBO.TEST_TBL
  (
    ID NUMBER(10) NOT NULL PRIMARY KEY
  );
declare v_row CONCEPT.decoction%rowtype;
BEGIN
  SELECT * INTO v_row FROM concept.Decoction WHERE DecoctionId = -1;
  INSERT INTO DBO.TEST_TBL SELECT v_row.DecoctionId from dual;
END;
select * from DBO.TEST_TBL;
 
4. 以记录类型定义的变量
drop table DBO.TEST_TBL;
create table DBO.TEST_TBL
  (
    ID NUMBER(10) NOT NULL PRIMARY KEY,
    NAME nvarchar2(50)
  );
 
declare  
  type v_flds is record(
    ID concept.Decoction.DecoctionId%type,
    NAME concept.Decoction.Name%type);
  v_row v_flds;
BEGIN
  SELECT DecoctionId,Name INTO v_row FROM concept.Decoction WHERE DecoctionId = 62;
  INSERT INTO DBO.TEST_TBL SELECT v_row.ID, v_row.NAME from dual;
END;
select * from DBO.TEST_TBL;
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