使用表中的值执行存储过程SQL

Question

Check my table below:

ID  Number01  Number02  Number03
-----------------------------------
1   10        20        4510
2   5         2         545
3   4         4         664
4   10        1         NULL
5   1         4         NULL

"Number03" field is a calculated field which is Number01 + Number02. I am using a stored procedure to calculate it. Why I am using a stored procedure? Because I have the interface which made by asp.net.

This is the stored procedure:

ALTER PROCEDURE _mySP
    (@Number01 decimal(18,0), @Number02 decimal(18,0))
AS
BEGIN
    DECLARE @myCOM1 float
    DECLARE @myCOM2 float

    SET @myCOM1 = @Number1 + 500
    SET @myCOM2 = POWER(@Number2, 2) * 10

    INSERT INTO _myTable(Number01, Number02, Number03) 
    VALUES (@Number01, @Number02, @myCOM1 + @myCOM2)
END

The question is, how can I execute the stored procedure without entering the value one by one? Because the value is already in the table. I want to update all the null value on "Number03" field. Also any idea how execute my question using CURSOR?

EDIT: It seems that my previous question is too simple. So I make it complex a little bit.

Answer 1

Since you're using SQL Server 2008, you can use a computed field to generate the value from the other two fields.

If you just want to update the table without doing this, you could use the following SQL:

UPDATE _myTable SET Number03 = ISNULL(Number01,0) + ISNULL(Number02,0)

This will update all rows.

You could update the SP to take a 3rd param:

ALTER PROCEDURE _mySP
    (
      @Number01 DECIMAL(18, 0) ,
      @Number02 DECIMAL(18, 0) ,
      @IsUpdate BIT = 0
    )
AS
    BEGIN
        IF ( @IsUpdate = 0 )
            BEGIN
                INSERT  INTO _myTable
                        ( Number01 ,
                          Number02 ,
                          Number03
                        )
                VALUES  ( @Number01 ,
                          @Number02 ,
                          ISNULL(@Number01,0) + ISNULL(@Number02,0)
                        )
            END
        ELSE
            BEGIN
                UPDATE  _myTable
                SET     Number03 = ISNULL(Number01,0) + ISNULL(Number02,0)
                WHERE Number03 IS NULL
            END
    END

EDIT : I have added ISNULL to the calculation for any numbers that are null , it will use 0 instead.

Answer 2

If you really want to use the SP to do the work you have to do it one at a time. Write a cursor to select all the rows with a NULL value and call the SP for each row passing Number01 and Number02.

I suspect your actual example is rather more complicated than the code you've shown. If you are able to go into more detail we may be able to suggest better approaches. If it is indeed this simple a computed column or simple update statement would be the way to go.

Answer 3

You can use computed columns like this. It will automatically fill all data in number03 column.

CREATE TABLE _myTable(
ID INT IDENTITY(1,1),
Number01  INT,
Number02  INT,
Number03 AS (Number01 + Number02)
)

------OR if you already have table then

Alter table _myTable Drop column Number03;
Alter table _myTable Add Number03 AS (Number01 + Number02);

------------- EDITED ACCORDING TO YOUR EDITING IN QUESTIONS

You can still put this formula in computed column. But as you are asking another way, so You can edit your SP like this

ALTER PROCEDURE _mySP
AS
BEGIN
Update _myTable
set Number03 = ((Number01 + 500) + (POWER(Number02, 2) * 10))
WHERE Number03 is NULL;
END

--------Executing Stored procedure will update table without providing any parameters
Exec _mySP

Answer 4

Here is how you could do it:

CREATE TABLE #Test(
ID int,
Number1 decimal(18,0),
number2 decimal(18,0),
number3 decimal(18,0))

INSERT INTO #Test
VALUES
(1  , 10, 20, 30),
(2  , 5 , 2,  7),
(3  , 4,  4 , 8),
(4  , 10, 1,  NULL),
(5  , 1,  4,  NULL)

UPDATE #Test
Set Number3 = Number1 + number2

SELECT * FROM #Test
DROP TABLE #Test

Example at SQLFiddle