如何判斷資料庫是否存在

在建立資料庫時，經常要判斷伺服器中是否存在某個資料庫，然後再決定是不是要進行下一步操作。

以下是一些簡單地示例，希望會有用。

2:

ifexists(select * from master.dbo.sysdatabases where name = 'skybusiness')

3:

begin

4:

drop
database skybusiness

5:

print
'skybusiness 已經存在，已被刪除'

6:

end

7:

else

8:

begin

9:

create
database skybusiness

10:

onprimary

11:         (

12:           name=skybusiness_mdf,

13:           filename='c:\skybusiness.mdf',

14:

size=10mb,

15:           maxsize=50mb,

16:           filegrowth=25%

17:         )

18:         log on

19:         (

20:           name=skybusiness_ldf,

21:           filename='c:\skybusiness.ldf',

22:

size=10mb,

23:           maxsize=50mb,

24:           filegrowth=25%

25:         )

26:

print
'skybusiness資料庫建立成功'

27:

end

28:

29: --建聚集索引

30:

create
clustered
index index_yexinwinners

31:

on tablename(column_name)

32:

with
fillfactor = 10

33:

34: --建非聚集索引

35:

create
nonclustered
index index_yexinwinners

36:

on tablename(column_name)

37:

with
fillfactor = 10

38:

39: --建檢視

40:

create
view view_name

41:

as

42:

select * from pubs.titles(sql語句，任意)

43:

44: --建檢查檢視

45:

create
view view_name

46:

as

47:

select * from pubs.titles(sql語句，任意)

48:

with
check
option

49:

50: --建加密檢視

51:

create
view view_name

52:

with encryption

53:

as

54:

select * from pubs.titles(sql語句，任意)

55:

56: --建表

57:

create
table tablename

58: ( ---(欄位名，字段型別 自己任意)

59: stuid int

notnull
identity(1,1) primary
key,

60: stuname varchar(30) not

null,

61: stuage char(3) not

null

62: )

63:

64: --新增check約束

65:

alter
table tablename

66:

addcheck(stuage >0 and stuage <100)

67:

68: --新增外來鍵

69:

alter
table tablename

70:

addforeign
key (stuname)

71:

references xtablename(stuname)

72:

73: --新增唯一約束

74:

alter
table tablename

75:

addunique(stuid)

76:

77: ---建事務

78:

begin tranaction

79:

update xtable set money = money + 10000 where id = 1

80:

update xtable set money = money - 10000 where id = 3

81:

if(@@error <> 0)

82:

begin

83:

print
'轉帳失敗'

84:

rollback
transaction

85:

end

86:

else

87:

begin

88:

print
'轉帳成功'

89:

commit
transaction

90:

end

91:

92: --建游標

93:

declare cursor_name cursor

94:

forselect * from northwind.product

95:

96: --建更新游標

97:

declare cursor_name cursor

98:

forselect * from northwind.product

99:

forupdate

100:

101: --建隨意移動游標

102:

declare cursor_name cursor
scroll

103:

forselect * from northwind.product

104:

105: --使用游標

106:

open cursor_name

107:

108: --關閉游標

109:

close cursor_name

110:

111: --刪除游標

112:

deallocate cursor_name

113:

114: --移動游標

115:

116:

fetch
next
-- 下一條記錄

117:

fetch
last --最後一條記錄

118:

fetch
first --第一條記錄

119:

fetch
prior --上一條記錄

120:

fetch
absolute n -- 絕對位置

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