Posted in Javascript onJune 11, 2008
今天我就把我用ACCESS参数化查询的一些方法和经验和大家分享
希望对大家有所启发,有写的不对的地方希望高手们多多指教
ASP.NET 用OleDbCommand的new OleDbParameter创建参数货查询
ASP用Command的CreateParameter 方法创建参数化查询
(SQL储存过程查询也是用这个方法建立的)
ASP.NET C#语法
OleDbParameter parm = new OleDbParameter(Name, Type, Direction, Size, Value);
(实际上它有七重载大家具体大家可以在VS.net里面就可以看到)
参数
Name 可选,字符串,代表 Parameter 对象名称。
Type 可选,长整型值,指定 Parameter 对象数据类型。
Direction 可选,长整型值,指定 Parameter 对象类型。。
Size 可选,长整型值,指定参数值最大长度(以字符或字节数为单位)。
Value 可选,变体型,指定 Parameter 对象的值。
以下是实例,查询news表中所有tsing发表的新闻
sql="select * from newss where username=? order by id" //注意查询的条件均用?号表示 OleDbConnection conn = new OleDbConnection(connString); OleDbCommand cmd = new OleDbCommand(sql,conn); OleDbParameter parm = new OleDbParameter("temp",OleDbType.VarChar, 50); //temp为Parameter对象可随便定义,OleDbType.VarChar指定为字符串,长度50 parm.Direction = ParameterDirection.Input; //指定其类型输入参数 cmd.Parameters.Add(parm); cmd.Parameters["temp"].Value = "tsing"; //查询tsing,也可以写成cmd.Parameters[0] conn.Open(); cmd.ExecuteReader();
ASP VBSCRIPT语法
Set parameter = command.CreateParameter (Name, Type, Direction, Size, Value)
参数同上
以下是实例,查询news表中所有tsing发表的新闻
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set 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
与上面基本相同不同的地方法是asp在对参数的表达上面不同
129为adChar,1就是指示输入参数(是其实是默认值)
大家请参阅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
附我写的C#类,和VBSCRIPT函数,希望对大家有帮助
using System; using System.Data; using System.Configuration; using System.Web; using System.Data.OleDb; namespace acc_select { /// <summary> /// accselect 的摘要说明 /// </summary> public class accselect { //"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=d:\dq\db1.mdb" private string conn = ConfigurationManager.ConnectionStrings["tsingConnectionString"].ToString(); public string sql = string.Empty; public int t = 4; public object v = null; public accselect() { } /// <summary> /// 构造函数,传递ACC参数查询语句 /// </summary> /// <param name="strsql">strsql字符型</param> public accselect(string strsql) { sql = strsql; } /// <summary> /// 构造函数,传递ACC参数查询语句 /// </summary> /// <param name="strsql">参数查询语句</param> /// <param name="total">字节数</param> public accselect(string strsql, int total) { sql = strsql; t = total; } /// <summary> /// 构造函数 /// </summary> /// <param name="strsql">参数查询语句</param> /// <param name="total">字节数</param> /// <param name="value">OBJECT值</param> public accselect(string strsql, int total, object value) { sql = strsql; t = total; v = value; } /// <summary> /// getOdd方法返回OleDbDataReader /// </summary> /// <param name="odt">定义OleDbType类型</param> /// <returns></returns> public OleDbDataReader getOdd(OleDbType odt) { OleDbConnection conns = new OleDbConnection(this.conn); OleDbCommand cmd = new OleDbCommand(this.sql, conns); OleDbParameter parm = new OleDbParameter("temp", odt, this.t); parm.Direction = ParameterDirection.Input; cmd.Parameters.Add(parm); cmd.Parameters[0].Value = this.v; conns.Open(); OleDbDataReader oda = cmd.ExecuteReader(); cmd.Dispose(); return oda; } string Sql { get { return sql; } set { sql = value; } } int T { get { return t; } set { t = value; } } object V { get { return v; } set { v = value; } } } } //调用方法 //accselect acc = new accselect(); //acc.sql = "select * from dtt where d_id=?"; //acc.t = 10; //acc.v = 1; //OleDbDataReader oda = acc.getOdd(OleDbType.VarChar); //Repeater1.DataSource = oda; //Repeater1.DataBind();
function acc_sql(sql,adotype,adodct,strlong,values) dim connstring,mycmd,myrs,conn connString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Server.MapPath("db1.mdb") set 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",adotype,adodct,strlong,values) mycmd.Parameters.Append mypar set myrs = mycmd.Execute set acc_sql=myrs end function '调用方法 'dim rs 'sql="select * from users where id=? order by id" 'set rs=acc_sql(sql,3,1,4,1) 'if not rs.eof then 'response.Write(rs(1)) 'end if
asp.net和asp下ACCESS的参数化查询
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