數據庫設計--第七章上機題和課後簡答題

練習1：使用存儲過程查看錶信息

USE MySchool
GO
EXEC sp_columns Student  --查看錶Student中列的信息
EXEC sp_help Student  --查看錶Student的所有信息
EXEC sp_helpconstraint Student --查看錶Student的約束

練習2：查詢獲得各學期課程信息

/*---創建存儲過程----*/
CREATE PROCEDURE usp_grade_subject
AS 
   SELECT GradeName,SubjectName,ClassHour FROM Grade 
   INNER JOIN Subject
   ON Grade.GradeId=Subject.GradeId
   ORDER BY Subject.GradeId,SubjectNo
GO
/*---調用執行存儲過程---*/
EXEC usp_grade_subject 

練習3：用存儲過程查指定學期課程

CREATE PROCEDURE usp_query_subject
  @GradeName VARCHAR(50) = NULL
AS 
  IF @GradeName IS NULL
    SELECT GradeName,SubjectName,ClassHour FROM Grade 
    LEFT JOIN Subject   ON Grade.GradeId=Subject.GradeId 
    UNION 
    SELECT GradeName,' ',SUM(ClassHour)FROM Grade
    LEFT JOIN Subject  ON Grade.GradeId=Subject.GradeId 
    GROUP BY GradeName
  ELSE
    SELECT GradeName,SubjectName,ClassHour FROM Grade
    LEFT JOIN Subject  ON Grade.GradeId=Subject.GradeId 
    WHERE GradeName=@GradeName
    UNION
    SELECT GradeName,' ',SUM(ClassHour)FROM Grade
    LEFT JOIN Subject  ON Grade.GradeId=Subject.GradeId 
    WHERE GradeName=@GradeName
    GROUP BY GradeName
GO


EXEC usp_query_subject 's2'

練習4：存儲過程獲指定學期課程數

CREATE PROCEDURE usp_query_subject
   @CourseNum INT OUTPUT,  
   @HourNum INT OUTPUT,  
   @GradeName VARCHAR(50)
AS 
    IF LEN(@GradeName) = 0
       BEGIN
          PRINT '學期名稱不能爲空'
          RETURN
       END
    PRINT '---------學期課程信息如下------------'
    SELECT GradeName,SubjectName,ClassHour FROM Grade 
    LEFT JOIN Subject ON Grade.GradeId=Subject.GradeId 
    WHERE GradeName=@GradeName

    SELECT @CourseNum=COUNT(0), @HourNum=SUM(ClassHour)
    FROM  Grade
    INNER JOIN Subject ON Grade.GradeId=Subject.GradeId 
    WHERE GradeName=@GradeName
GO

練習5：插入新課程記錄

CREATE PROCEDURE usp_insert_subject
    @SubjectNo int OUTPUT,
    @GradeId int OUTPUT,
	@GradeName varchar(50),
	@SubjectName varchar(50),
    @ClassHour int = 36
AS 
    DECLARE @errNum int
	SET @errNum = 0
	
	IF (LEN(RTRIM(@SubjectName))=0 OR LEN(RTRIM(@GradeName))=0)
		RETURN -1

    BEGIN TRANSACTION
    IF NOT EXISTS(SELECT * FROM Grade WHERE GradeName = @GradeName)
	  BEGIN
		INSERT INTO Grade (GradeName) VALUES (@GradeName)
		SET @errNum = @errNum + @@ERROR
		SELECT @GradeId=@@IDENTITY
	  END
	ELSE
		SELECT @GradeId=GradeId FROM Grade WHERE GradeName = @GradeName

	INSERT INTO Subject (SubjectName,ClassHour,GradeId) 
		VALUES (@SubjectName,@ClassHour,@GradeId)
	SET @errNum = @errNum + @@ERROR

	SELECT @SubjectNo=@@IDENTITY

	IF (@errNum > 0)
	  BEGIN
		ROLLBACK TRANSACTION
		RETURN 0 
	  END
	ELSE
	  BEGIN
		COMMIT TRANSACTION
		RETURN 1
	  END
GO

--調用存儲過程
DECLARE @SubjectNo int
DECLARE @GradeId int
DECLARE @GradeName varchar(50)
DECLARE @SubjectName varchar(50)
DECLARE @ClassHour int
DECLARE @rt int

SET @GradeName = 'Y2'
SET @SubjectName = 'Linux'
SET @ClassHour = 10
EXEC @rt=usp_insert_subject @SubjectNo OUTPUT,@GradeId OUTPUT,@GradeName,@SubjectName,@ClassHour
IF (@rt = 1)
  BEGIN
	PRINT '增加課程'+@SubjectName+'記錄成功'
	PRINT '學期編號是' + CAST(@GradeId AS varchar(10)) + '，學期名稱是' + @GradeName
	PRINT '課程編號是' + CAST(@SubjectNo AS varchar(10)) + '，課程名稱是' + @SubjectName
  END
ELSE if (@rt = 0)
	PRINT '增加課程記錄失敗！'
ELSE
	PRINT '學期名稱或課程名稱不能爲空，請重新執行！'
GO

1.顯示圖書借閱記錄

/*
*2.存儲過程實現分頁 @page爲第幾頁 @row爲每頁多少行
*/
IF EXISTS (SELECT * FROM sysobjects WHERE NAME='proc_page')
 DROP PROCEDURE proc_page
GO

CREATE PROCEDURE proc_page
	@page int,
	@row int =10
  As
    DECLARE @total AS int 
    SELECT @total=count(*) FROM Borrow
	IF @total<=(@page-1)*@row
		 print('總條數爲'+convert(varchar(5),@total)+'請確認參數')
	ELSE
		SELECT TOP (@row)  * FROM Borrow  WHERE rid NOT IN(SELECT TOP ((@page-1)*@row) rid FROM Borrow)
GO
--執行語句
exec proc_page 1
 

2.顯示圖書信息

/*
*3.存儲過程統計已'北京'冠名的出版社的圖書信息
*/
IF EXISTS (SELECT * FROM sysobjects WHERE NAME='proc_book')
	DROP PROCEDURE proc_book
GO
CREATE PROCEDURE proc_book
@bname varchar(50)
 AS
	SELECT * FROM Book WHERE PubComp like @bname
GO

--執行存儲過程
exec proc_book '北京%'

3.存儲過程顯示借閱次數

/*
*4.存儲過程統計某一時間段的借閱信息
*/
IF EXISTS (SELECT * FROM sysobjects WHERE NAME='proc_borrow')
	DROP PROCEDURE proc_borrow
GO
CREATE PROCEDURE proc_borrow
	@beginDate datetime,  --注意參數不能直接用函數賦值
	@endDate datetime
AS
  IF @beginDate IS NULL
       SET  @beginDate=DateAdd(MM,-1,getDate())
  IF @endDate IS NULL
       SET  @endDate=getDate()
  SELECT * FROM Borrow WHERE LendDate BETWEEN @beginDate AND @endDate
GO

4.存儲過程實現插入借閱記錄

/*
*5.存儲過程實現插入借閱記錄，
輸入參數：借書人ID、姓名、借書的名稱，要求：
（1）圖書信息表Book對應的圖書數量減1；
（2）讀者信息表Reader對應的讀者已借書數量加1。如沒有該借閱者的信息，則新加一條讀者信息條記錄；
（3）向圖書借閱表Borrow中添加一條借閱記錄，借閱日期、應歸還日期、實際歸還日期都採用默認值。
表結構參考第2章作業的簡答題。
*/

IF EXISTS (SELECT * FROM sysobjects WHERE NAME='proc_addreader')
	DROP PROCEDURE proc_addreader
GO

CREATE PROCEDURE proc_addreader
	@RID varchar(50), --reader ID
	@Rname varchar(50), --reader name
	@Bname varchar(50)  --borrow book name
AS
	BEGIN TRANSACTION
	DECLARE @errorSum int
	SET @errorSum=0
	UPDATE Book SET BCount=BCount-1 WHERE(BName=@Bname)
	SET @errorSum=@errorSum+@@error
	IF EXISTS(SELECT * FROM Reader WHERE RName=@Rname)
		UPDATE  Reader SET LendNum=LendNum+1 WHERE RName=@Rname
	ELSE
		INSERT INTO Reader VALUES(@RID,@RName,1) 
	SET @errorSum=@errorSum+@@error
	DECLARE @BID varchar(50)
    SELECT @BID=BID FROM Book WHERE BName=@Bname
	INSERT INTO Borrow(RID,BID) VALUES (@RID,@BID)
	SET @errorSum=@errorSum+@@error

	IF (@errorSum<>0)
		BEGIN 
			print('失敗了')
			ROLLBACK TRANSACTION 
		END 
	ELSE 
		BEGIN 
			print('成功了')
			COMMIT TRANSACTION
		END 
GO