开发学院WEB开发ASP ASP创建ACCESS表或添加字段 阅读

ASP创建ACCESS表或添加字段

 2009-04-22 10:38:54 来源:WEB开发网   
核心提示: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

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

Tags:ASP 创建 ACCESS

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