Access建表语句
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)"
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 ateobject("tion")
conn.OPEN connectionstring
jhsql = " Alter Table "&session("tablen")&" add column "&session("fieldsn")&" real "
%>
================================
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
增加字段的sql语句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

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