最近因項(xiàng)目需要用ACCESS做數(shù)據(jù)庫(kù)開(kāi)發(fā)WEB項(xiàng)目看論壇上還許多人問(wèn)及ACCESS被注入的安全問(wèn)題許多人解決的方法仍然是用Replace替換特殊字符,然而這樣做也并沒(méi)有起到太大做用.今天我就把我用ACCESS參數(shù)化查詢的一些方法和經(jīng)驗(yàn)和大家分享,希望對(duì)大家有所啟發(fā),有寫的不對(duì)的地方希望高手們多多指教
ASP.NET 用OleDbCommand的new OleDbParameter創(chuàng)建參數(shù)貨查詢
ASP用Command的CreateParameter 方法創(chuàng)建參數(shù)化查詢
(SQL儲(chǔ)存過(guò)程查詢也是用這個(gè)方法建立的)
ASP.NET C#語(yǔ)法:
OleDbParameter parm = new OleDbParameter(Name, Type, Direction, Size, Value);
(實(shí)際上它有七重載大家具體大家可以在VS.net里面就可以看到)
參數(shù)
Name可選,字符串,代表 Parameter 對(duì)象名稱。
Type可選,長(zhǎng)整型值,指定 Parameter 對(duì)象數(shù)據(jù)類型。
Direction 可選,長(zhǎng)整型值,指定 Parameter 對(duì)象類型。。
Size可選,長(zhǎng)整型值,指定參數(shù)值最大長(zhǎng)度(以字符或字節(jié)數(shù)為單位)。
Value 可選,變體型,指定 Parameter 對(duì)象的值。
以下是實(shí)例,查詢news表中所有tsing發(fā)表的新聞
sql="select * from newss where username=? order by id"
//注意查詢的條件均用?號(hào)表示
OleDbConnection conn = new OleDbConnection(connString);
OleDbCommand cmd = new OleDbCommand(sql,conn);
OleDbParameter parm = new OleDbParameter("temp",OleDbType.VarChar, 50);
//temp為Parameter對(duì)象可隨便定義,OleDbType.VarChar指定為字符串,長(zhǎng)度50
parm.Direction = ParameterDirection.Input;
//指定其類型輸入?yún)?shù)
cmd.Parameters.Add(parm);
cmd.Parameters["temp"].Value = "tsing";
//查詢tsing,也可以寫成cmd.Parameters[0]
conn.Open();
cmd.ExecuteReader();
ASP VBSCRIPT語(yǔ)法
Set parameter = command.CreateParameter (Name, Type, Direction, Size, Value)
參數(shù)同上
以下是實(shí)例,查詢news表中所有tsing發(fā)表的新聞
------------------------------------------------------
et conn = Server.CreateObject("Adodb.Connection")
conn.ConnectionString = connString
conn.open()
set mycmd = Server.CreateObject("ADODB.Command")
mycmd.ActiveConnection=conn
mycmd.CommandText=sql
mycmd.Prepared = true
set mypar = mycmd.CreateParameter("temp",129,1,50,"tsing")
mycmd.Parameters.Append mypar
set myrs = mycmd.Execute
與上面基本相同不同的地方法是asp在對(duì)參數(shù)的表達(dá)上面不同
129為adChar,1就是指示輸入?yún)?shù)(是其實(shí)是默認(rèn)值)
大家請(qǐng)參閱MICROSOFT的ADOVB.Inc:
’---- ParameterDirectionEnum Values ----
Const adParamUnknown = 0
Const adParamInput = 1
Const adParamOutput = 2
Const adParamInputOutput = 3
Const adParamReturnValue = 4
’---- 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
更多信息請(qǐng)查看IT技術(shù)專欄