根据表生成流水号

CREATE TABLE [dbo].[TableWater](
    [Tb_id] [int] IDENTITY(1,1) NOT NULL,
    [Vc_table_name] [nvarchar](90) NULL,
    [Num_water_no] [varchar](100) NULL,
 CONSTRAINT [PK_TableWater] PRIMARY KEY CLUSTERED 
(
    [Tb_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

测试表

测试参数

DECLARE @return_value int,   @vmax_waterno bigint

EXEC @return_value = [dbo].[get_waterno]   @vtableName = N'testtable',   @vcnt = 1,   @vmax_waterno = @vmax_waterno OUTPUT

SELECT @vmax_waterno as N'@vmax_waterno'

SELECT 'Return Value' = @return_value

SQL Server 实现：

create PROCEDURE [dbo].[get_waterno] 
(
@vtableName   VARCHAR(90), --表名
@vcnt         INT ,--流水号
@vmax_waterno    bigint  output --最大流水号
)
as
BEGIN
   declare @Vcount int;
   set  @vmax_waterno=0;     
   SELECT  @Vcount=count(1)  FROM TableWater WHERE vc_table_name=@vtableName ; 
  
IF (@Vcount= 0 or @Vcount is null)      
    BEGIN        
    INSERT INTO TableWater(vc_table_name,num_water_no) VALUES(@vtableName, @vcnt );
    set  @vmax_waterno=@vcnt;  
    --return;       
    END;
     
ELSE
    BEGIN
        DECLARE @i bigint;
        
        set @i= 1;
        WHILE (@i<= 1000)  
        begin       
        UPDATE TableWater SET num_water_no=num_water_no+@vcnt    
        WHERE vc_table_name =@vtableName ;
         
      IF (@Vcount > 0 )
      BEGIN
      SELECT  @vmax_waterno=num_water_no FROM TableWater WHERE vc_table_name=@vtableName;
     -- return ;
     break;
     end;

    ELSE 
        BEGIN
        set @i= @i + 1;
        SELECT   @vmax_waterno=num_water_no FROM TableWater WHERE vc_table_name=@vtableName and num_water_no=@vmax_waterno ;
        set @vmax_waterno= NULL;            
      --return ;
      break;
      end;
     end;
    end;
   end;

SQL 调用

 ---调用存储过程   生成结果表流水号
       
      exec  get_waterno "testtable",1,@p_tmp_water_num output;  
       set @p_tmp_water_str= replicate('0',10)+ltrim (@p_tmp_water_num);

Oracle 实现：

 PROCEDURE spr_get_waterno 
    (
    
   vtableName IN  VARCHAR2, --表名
   vcnt       IN  INT ,--流水号
   vmax_waterno OUT  number --最大流水号
    
    )
    is
  Vcount int;
 
  BEGIN

     vmax_waterno:= 0;
     
    SELECT count(1) into Vcount FROM TableWater WHERE vc_table_name = vtableName ;
    
    IF (Vcount= 0 or Vcount is null)
       THEN
    BEGIN        
          INSERT INTO TableWater(vc_table_name,num_water_no) VALUES(vtableName, vcnt );
           vmax_waterno:= vcnt;
           --select max_waterno
          return;-- max_waterno;
          commit;
    END;
    ELSE
    BEGIN
          DECLARE i INTEGER;
          begin
           i:= 1;
          WHILE  i<= 1000 
             loop
              UPDATE TableWater  SET num_water_no = num_water_no + vcnt    
                  WHERE vc_table_name = vtableName  ;-- and num_water_no  = max_waterno;
              commit;
              IF (Vcount > 0 )
                
                THEN
              BEGIN
                  SELECT num_water_no INTO vmax_waterno FROM TableWater WHERE vc_table_name = vtableName;
                  -- SET max_waterno = max_waterno + cnt;
                  -- select max_waterno;
                 return ;
                
              END ;
              ELSE
              BEGIN
                   i:= i + 1;
                -------------------------------------------------------------------------------
                  SELECT num_water_no INTO vmax_waterno FROM TableWater WHERE vc_table_name = vtableName and vmax_waterno = num_water_no ;
                ------------------------------------------------------------------------
                vmax_waterno:= NULL;
                 --select max_waterno;
                  return ;
                 
              END;
              END IF;
           END  loop;
           vmax_waterno:= NULL;
           return;
    END;
    end;
    END IF;  
    COMMIT;
    
    END;

 oracle 调用

---调用存储过程   生成结果表流水号
      spr_get_waterno('testtable',1,p_tmp_water_num);    
       p_tmp_water_str:= LPAD(p_tmp_water_num,20,'0');