第七章上机练习

上机练习一：

USE MySchool
GO
EXEC sp_columns Student  --查看表Student中列的信息
EXEC sp_help Student  --查看表Student的所有信息
EXEC sp_helpconstraint Student --查看表Student的约束

上机练习二：

/*---创建存储过程----*/
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
/*---调用执行存储过程---*/
EXEC usp_grade_subject

上机练习三：

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'

上机练习四：

CREATE PROCEDURE usp_query_subject
@CourseNum INT OUTPUT,
@HourNum INT OUTPUT,
@GradeName VARCHAR(50)
AS
IF LEN(@GradeName) = 0
BEGIN
PRINT '学期名称不能为空'
RETURN
END
PRINT '---------学期课程信息如下------------'
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

上机练习五：

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

--调用存储过程
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 '增加课程'+@SubjectName+'记录成功'
PRINT '学期编号是' + CAST(@GradeId AS varchar(10)) + '，学期名称是' + @GradeName
PRINT '课程编号是' + CAST(@SubjectNo AS varchar(10)) + '，课程名称是' + @SubjectName
END
ELSE if (@rt = 0)
PRINT '增加课程记录失败！'
ELSE
PRINT '学期名称或课程名称不能为空，请重新执行！'
GO