Access sql语句创造表及字段类型

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 : “Date提姆(Tim)e”,                 // 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

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     Set clx = Nothing
     Set cat = Nothing
     cn.Close
     Set cn = Nothing End Sub

在存活的表中扩大字段:
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)”

call GenAutoIncrementFld

<%
session(“tablen”)=”news”
‘news是已存在的表名
session(“fieldsn”)=”c”
‘要增长的字段名
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)
%>

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

  
clx.Type = 3     
clx.Name = “Id”     
clx.Properties(“AutoIncrement”) = true     
tblnam.Columns.Append clx     
tblnam.Columns.Append “DataField”,130,20     
cat.Tables.Append tblnam

以下字段为无编码字段(NChar、NVarchar、NText型)
8,128,130,202,203,204,205
以下字段为按时下系统内码编码的字段(Asp中可用CodePage=936纠正为gb2312内码)
129,200,201

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”)

成立一张空表: Sql=”Create TABLE [表名]”

 

剔除约束:
Alter TABLE [表名] Drop CONSTRAINT 约束名

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ACCESS新建数据库和表还不简单,有了表字段开端化就更简约

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”—- 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

conn.open connstr sql=”alter table [tablename] add hehe char(20)”
conn.execute(sql) response.write(“添加事业有成”)

字段类型对应数值

删除表:
Sql=”Drop table [表名]”

新建约束:
Alter TABLE [表名] ADD CONSTRAINT 约束名 CHECK ([自律字段] <=
‘2007-1-1’)

变动数据表,添加字段,其中id字段为自发性扩展,测试通过~~

修改字段:
Alter TABLE [表名] Alter COLUMN [字段名] 类型(大小) NULL

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))

去除默认值:
Alter TABLE [表名] Drop CONSTRAINT 默认值名

tblnam.Name = “Test”     
clx.ParentCatalog = cat

字段类型:   

删去字段:
sql=”alter table [表名] drop [字段名]”

新建默认值:
Alter TABLE [表名] ADD CONSTRAINT 默认值名 DEFAULT ‘Gziu.CoM’ FOR
[字段名]

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