| ASP创建ACCESS表或添加字段 |
创建一张空表：
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Sql="Create TABLE [表名]"
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创建一张有字段的表：
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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))
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字段类型：
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2 : "SmallInt", // 整型
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3 : "Int", // 长整型
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4 : "Real", // 单精度型
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5 : "Float", // 双精度型
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6 : "Money", // 货币
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7 : "DateTime", // 日期时间
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11 : "Bit", // 是否
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13 : "TimeStamp",
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17 : "TinyInt", // 字节
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72 : "UniqueIdentifier", // 同步复制 ID
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128 : "Binary",
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129 : "Char",
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130 : "NChar",
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131 : "Decimal", // 小数
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133 : "DateTime",
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135 : "SmallDateTime",
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200 : "VarChar",
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201 : "Text",
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202 : "VarChar", // 文本
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203 : "Text", // 备注
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204 : "Binary", // 二进制
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205 : "Image" // OLE 对象
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以下字段为无编码字段（NChar、NVarchar、NText型）
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8,128,130,202,203,204,205
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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）
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129,200,201
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在现有的表中增加字段：
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Sql="alter table [表名] add column [字段名] varchar(200)"
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修改字段类型：
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Sql="alter table [表名] Alter COLUMN 字段名] varchar(50)"
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删除表：
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Sql="Drop table [表名]"
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删除字段：
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sql="alter table [表名] drop [字段名]"
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修改字段：Alter TABLE [表名] Alter COLUMN [字段名] 类型(大小) NULL
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新建约束：Alter TABLE [表名] ADD CONSTRAINT 约束名 CHECK ([约束字段] <= '2007-1-1')
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删除约束：Alter TABLE [表名] Drop CONSTRAINT 约束名
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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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删除默认值：Alter TABLE [表名] Drop CONSTRAINT 默认值名
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conn.open connstr
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sql="alter table [tablename] add hehe char(20)"
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conn.execute(sql)
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response.write("添加成功")
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ACCESS新建数据库和表还不简单，有了表字段初始化就更简单
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<%
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session("tablen")="news"
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'news是已存在的表名
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session("fieldsn")="c"
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'要添加的字段名
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connectionstring="provider=microsoft.jet.oledb.4.0;data source="&server.MapPath("data/qq.mdb")
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set conn=server.createobject("adodb.connection")
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conn.OPEN connectionstring
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jhsql = " Alter Table "&session("tablen")&" add column "&session("fieldsn")&" real "
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conn.execute(jhsql)
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%>
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================================
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生成数据表，添加字段，其中id字段为自动增加，测试通过~~
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Sub GenAutoIncrementFld()
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set cn=server.CreateObject("ADODB.Connection")
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set clx=server.CreateObject("ADOX.Column")
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set cat=server.CreateObject("ADOX.Catalog")
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set tblnam=server.CreateObject("ADOX.Table")
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cn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\网站制作\asp操作mdb\db\test.mdb"
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Set cat.ActiveConnection = cn
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tblnam.Name = "Test"
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clx.ParentCatalog = cat
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clx.Type = 3
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clx.Name = "Id"
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clx.Properties("AutoIncrement") = true
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tblnam.Columns.Append clx
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tblnam.Columns.Append "DataField",130,20
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cat.Tables.Append tblnam
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Set clx = Nothing
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Set cat = Nothing
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cn.Close
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Set cn = Nothing
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End Sub
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call GenAutoIncrementFld
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===================================
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字段类型对应数值
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''---- DataTypeEnum Values ----
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Const adEmpty = 0
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Const adTinyInt = 16
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Const adSmallInt = 2
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Const adInteger = 3
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Const adBigInt = 20
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Const adUnsignedTinyInt = 17
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Const adUnsignedSmallInt = 18
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Const adUnsignedInt = 19
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Const adUnsignedBigInt = 21
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Const adSingle = 4
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Const adDouble = 5
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Const adCurrency = 6
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Const adDecimal = 14
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Const adNumeric = 131
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Const adBoolean = 11
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Const adError = 10
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Const adUserDefined = 132
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Const adVariant = 12
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Const adIDispatch = 9
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Const adIUnknown = 13
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Const adGUID = 72
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Const adDate = 7
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Const adDBDate = 133
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Const adDBTime = 134
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Const adDBTimeStamp = 135
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Const adBSTR = 8
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Const adChar = 129
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Const adVarChar = 200
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Const adLongVarChar = 201
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Const adWChar = 130
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Const adVarWChar = 202
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Const adLongVarWChar = 203
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Const adBinary = 128
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Const adVarBinary = 204
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Const adLongVarBinary = 205
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Const adChapter = 136
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Const adFileTime = 64
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Const adPropVariant = 138
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Const adVarNumeric = 139
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Const adArray = &H2000
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