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Access sql语句创建表及字段类型
创建一张空表: Sql="
Create TABLE [表名]"
创建一张有字段的表: Sql="
Create TABLE [表名]([字段名1] MEMO NOT NULL, [字段名2] MEMO, [字段名3] COUNTER NOT NULL, [字段名4] DATETIME, [字段名5] TEXT(200), [字段名6] TEXT(200))
字段类型:
2 : "
SmallInt"
, // 整型
3 : "
Int"
, // 长整型
4 : "
Real"
, // 单精度型
5 : "
Float"
, // 双精度型
6 : "
Money"
, // 货币
7 : "
DateTime"
, // 日期时间
11 : "
Bit"
, // 是否
13 : "
TimeStamp"
,
17 : "
TinyInt"
, // 字节
72 : "
UniqueIdentifier"
, // 同步复制 ID
128 : "
Binary"
,
129 : "
Char"
,
130 : "
NChar"
,
131 : "
Decimal"
, // 小数
133 : "
DateTime"
,
135 : "
SmallDateTime"
,
200 : "
VarChar"
,
201 : "
Text"
,
202 : "
VarChar"
, // 文本
203 : "
Text"
, // 备注
204 : "
Binary"
, // 二进制
205 : "
Image"
// OLE 对象
以下字段为无编码字段(NChar、NVarchar、NText型) 8,128,130,202,203,204,205 以下字段为按当前系统内码编码的字段(Asp中可用CodePage=936纠正为gb2312内码) 129,200,201
在现有的表中增加字段:
Sql="
alter table [表名] add column [字段名] varchar(200)"
修改字段类型:
Sql="
alter table [表名] Alter COLUMN 字段名] varchar(50)"
删除表:
Sql="
Drop table [表名]"
删除字段:
sql="
alter table [表名] drop [字段名]"
修改字段:
Alter TABLE [表名] Alter COLUMN [字段名] 类型(大小) NULL
新建约束:
Alter TABLE [表名] ADD CONSTRAINT 约束名 CHECK ([约束字段] <
= '2007-1-1')
删除约束:
Alter TABLE [表名] Drop CONSTRAINT 约束名
新建默认值:
Alter TABLE [表名] ADD CONSTRAINT 默认值名 DEFAULT 'Gziu.CoM' FOR [字段名]
删除默认值:
Alter TABLE [表名] Drop CONSTRAINT 默认值名
=======================================
conn.open connstr sql="
alter table [tablename] add hehe char(20)"
conn.execute(sql) response.write("
添加成功"
)
ACCESS新建数据库和表还不简单,有了表字段初始化就更简单
=======================================
<
%
session("
tablen"
)="
news"
'news是已存在的表名
session("
fieldsn"
)="
c"
'要添加的字段名
connectionstring="
provider=microsoft.jet.oledb.4.0
data source="
&
server.MapPath("
data/qq.mdb"
)
set conn=server.createobject("
adodb.connection"
)
conn.OPEN connectionstring
jhsql = "
Alter Table "
&
session("
tablen"
)&
"
add column "
&
session("
fieldsn"
)&
"
real "
conn.execute(jhsql)
%>
================================
生成数据表,添加字段,其中id字段为自动增加,测试通过~~
Sub GenAutoIncrementFld()
set cn=server.CreateObject("
ADODB.Connection"
)
set clx=server.CreateObject("
ADOX.Column"
)
set cat=server.CreateObject("
ADOX.Catalog"
)
set tblnam=server.CreateObject("
ADOX.Table"
)
cn.Open "
Provider=Microsoft.Jet.OLEDB.4.0
Data Source=E:\网站制作\asp操作mdb\db\test.mdb"
Set cat.ActiveConnection = cn
tblnam.Name = "
Test"
clx.ParentCatalog = cat
clx.Type = 3
clx.Name = "
Id"
clx.Properties("
AutoIncrement"
) = true
tblnam.Columns.Append clx
tblnam.Columns.Append "
DataField"
,130,20
cat.Tables.Append tblnam
Set clx = Nothing
Set cat = Nothing
cn.Close
Set cn = Nothing End Sub
call GenAutoIncrementFld
===================================
字段类型对应数值
''---- DataTypeEnum Values ----
Const adEmpty = 0
Const adTinyInt = 16
Const adSmallInt = 2
Const adInteger = 3
Const adBigInt = 20
Const adUnsignedTinyInt = 17
Const adUnsignedSmallInt = 18
Const adUnsignedInt = 19
Const adUnsignedBigInt = 21
Const adSingle = 4
Const adDouble = 5
Const adCurrency = 6
Const adDecimal = 14
Const adNumeric = 131
Const adBoolean = 11
Const adError = 10
Const adUserDefined = 132
Const adVariant = 12
Const adIDispatch = 9
Const adIUnknown = 13
Const adGUID = 72
Const adDate = 7
Const adDBDate = 133
Const adDBTime = 134
Const adDBTimeStamp = 135
Const adBSTR = 8
Const adChar = 129
Const adVarChar = 200
Const adLongVarChar = 201
Const adWChar = 130
Const adVarWChar = 202
Const adLongVarWChar = 203
Const adBinary = 128
Const adVarBinary = 204
Const adLongVarBinary = 205
Const adChapter = 136
Const adFileTime = 64
Const adPropVariant = 138
Const adVarNumeric = 139
Const adArray = &
H2000
Access sql语句创建表及字段类型