transitional.dtd"> 演示OleDbCommand...myConnection = new OleDbConnection(sqlconn); //打开数据库连接 myConnection.Open(); OleDbCommand...myCommand = new OleDbCommand("select * from 运货商", myConnection); OleDbDataReader myReader;...Response.Write("使用OleDbCommand类读取数据"); Response.Write("<table border=1 cellspacing...myCommand = new OleDbCommand("select * from 运货商", myConnection); OleDbDataReader myReader; myReader
OleDbCommand 的特点在于以下对数据源执行命令的方法： ExecuteReader 执行返回行的命令。...您可以重置 CommandText 属性并重复使用 OleDbCommand 对象。但是，在执行新的命令或先前命令之前，必须关闭 OleDbDataReader。...如果执行 OleDbCommand 的方法 OleDbConnection 生成致命的 OleDbException（例如，SQL Server 严重级别等于或大于 20），连接可能会关闭。...Dim cmd As OleDbCommand = New OleDbCommand(sql, oracleConn) cmd.Parameters.Add(“@p1”, OleDbType.Char,...; OleDbCommand cmd = new OleDbCommand(sql, oracleConn); cmd.Parameters.Add(“@p1”, OleDbType.Char, 3).
用法 con=new OleDbConnection(“Provider=Microsoft.Jet.OLEDB.4.0; data source=data.mdb”); con.Open(); OleDbCommand...dc=new OleDbCommand(“select name from us where id=2”, con); textBox1.Text=dc.ExecuteScalar().ToString...dc=new OleDbCommand(“insert into us (name) values (11)”, con); dc.ExecuteNonQuery(); con.Close(); string...OleDbConnection con=new OleDbConnection(“Provider=Microsoft.Jet.OLEDB.4.0; data source=data.mdb”); OleDbCommand...oldC=new OleDbCommand(“insert into users (username, userpassword) values (@username, @userpassword)”
string strCom = “select * from account where uid = ‘” + strUid + “‘ and pwd = ‘” + strPwd + “‘”; OleDbCommand...thisCommand = new OleDbCommand(strCom,thisConnection); thisCommand.ExecuteReader(); 或者 thisCommand.ExecuteNonQuery
delete from B; insert into B(A,B) values(:a,:b); end; “ ; // 很正常的 OleDbCommand...cmd = new OleDbCommand(sql,conn); cmd.Parameters.Add( “ a “ ,OleDbType.VarChar...cmd = new OleDbCommand(sql,conn); cmd.Parameters.Add( “ a “ ,OleDbType.VarChar...cmd = new OleDbCommand(sql,conn); cmd.Parameters.Add( “ a “ ,OleDbType.VarChar...cmd = new OleDbCommand(sql,conn); cmd.Parameters.Add( “ a “ ,OleDbType.VarChar
公共构造函数 OleDbCommand 构造函数 已重载。初始化 OleDbCommand 类的新实例。 公共属性 CommandText 获取或设置要对数据源执行的 SQL 语句或存储过程。...Connection 获取或设置 OleDbCommand 的此实例使用的 OleDbConnection。...Transaction 获取或设置将在其中执行 OleDbCommand 的 OleDbTransaction。...公共方法 Cancel 试图取消执行 OleDbCommand。...释放由 OleDbCommand 使用的资源。 Finalize（从 Component 继承） 已重写。在通过垃圾回收将 Component 回收之前，释放非托管资源并执行其他清理操作。
今日连接数据库，写下以下代码 Dim conn As New OleDbConnection Dim cmd As New OleDbCommand...上面代码conn.open过早，前半部分调整为 Dim conn As New OleDbConnection Dim cmd As New OleDbCommand
最近写程序用到OleDbCommand的Parameter写数据库，遇到很多问题: 1、OLE DB .NET Framework 数据提供程序和 ODBC .NET Framework 数据提供程序不支持用于将参数传递到...2、将参数用于OleDbCommand 或 OdbcCommand 时，向 Parameters 集合中添加参数的顺序必须与存储过程中所定义的参数顺序相匹配。...; OleDbCommand comm = new OleDbCommand(sql, conn); comm.Parameters.Add...我从网上查到一个网友的回复如下：我想应该是这样的 1.SqlCommand should be ‘@’ character 2.OleDbCommand or OdbcCommand should be
说明 OleDbCommand () 初始化 OleDbCommand...OleDbCommand (String) 用查询文本初始化 OleDbCommand 类的新实例。...OleDbCommand (String, OleDbConnection) 初始化具有查询文本和 OleDbConnection 的 OleDbCommand 类的新实例。...OleDbCommand 类的新实例。...而OleDbCommand用于 OleDbCommand oldcmd=new OleDbCommand(sql,olecon); 用于OleConnection和SQL语句这两个参数对象。
(OleDbConnection connection1 = new OleDbConnection(connectionString)) { OleDbCommand...command1 = new OleDbCommand(); command1.Connection = connection1; command1
conn = new OleDbConnection(“Provider = Microsoft.Jet.OLEDB.4.0;Data Source = fruit.mdb”); OleDbCommand
创建OleDbCommand对象来定义要执行的SQL查询。创建OleDbDataAdapter和DataSet，用于接收查询结果。...写入数据要向Excel文件写入数据，可以使用OleDbConnection和OleDbCommand对象。下面示例展示了如何打开一个连接，单条写入数据到Excel表格中。...cmd = new OleDbCommand("INSERT INTO [Sheet1$] (Column1, Column2) VALUES ('Value1', 'Value2')", conn)...command = new OleDbCommand("SELECT FirstName, LastName FROM Employees", connection)) using...OleDbCommand: 用于执行SQL命令。OleDbDataReader: 用于读取从数据库返回的结果。注意事项确保修改连接字符串以匹配你的数据库设置。
cmd = new OleDbCommand(); using (OleDbConnection conn = new OleDbConnection(connectionString...cmd = new OleDbCommand(); PrepareCommand(cmd, connection, null, cmdText, commandParameters);...cmd = new OleDbCommand(); PrepareCommand(cmd, trans.Connection, trans, cmdText, commandParameters...cmd = new OleDbCommand(); using (OleDbConnection conn = new OleDbConnection(connectionString...cmd = new OleDbCommand(); PrepareCommand(cmd, connection, null, cmdText, commandParameters);
cmd = new OleDbCommand(); cmd.Connection = conn; OleDbTransaction...cmd = new OleDbCommand(strSQL, connection); try {...cmd = new OleDbCommand()) { try {...cmd = new OleDbCommand(); try { PrepareCommand(cmd...cmd = new OleDbCommand(); PrepareCommand(cmd, connection, null, SQLString, cmdParms
login.accdb"; （3） 建立连接： OleDbConnection tempconn =new OleDbConnection(connStr); （4） 使用OleDbCommand...类来执行Sql语句： OleDbCommand cmd = new OleDbCommand(sql, tempconn); tempconn.Open(...cmd = new OleDbCommand(sql,conn)) { if (param !...cmd = new OleDbCommand(sql, conn)) { if (param !...cmd = new OleDbCommand(sql, conn)) { if (param !
System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult...) +267 System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) +192 System.Data.OleDb.OleDbCommand.ExecuteCommand...(CommandBehavior behavior, Object& executeResult) +48 System.Data.OleDb.OleDbCommand.ExecuteReaderInternal...(CommandBehavior behavior, String method) +106 System.Data.OleDb.OleDbCommand.ExecuteNonQuery() +
} return Connection; } #endregion #region 创建一个OleDbCommand...对象实例 /// /// 创建一个OleDbCommand对象实例 /// /// 可选参数 /// private static OleDbCommand...comm = new OleDbCommand(CommandText, Connection); if (OleDbParameters !...if (Connection.State == ConnectionState.Closed) Connection.Open(); OleDbCommand
Persist Security Info=False;"; OleDbConnection cn=new OleDbConnection(a); // OleCommand cm=new OleDbCommand... ad.Fill(ds,"petro_well"); //MessageBox.Show (ds.Tables[0].Columns[1].Caption ); //命令 //OleDbCommand...cm=new OleDbCommand("insert into test (a,b) values(\"jjj\",\"kkk\")",cn); OleDbCommand cm=new OleDbCommand
另外顺便说一下 ASP.Net页提供类似如下方式的操作方法： OleDbCommand2.Parameters( “ au_id “ ).Value = TextBox1.Text...OleDbCommand2.Parameters( “ au_lname “ ).Value = TextBox2.Text OleDbCommand2.Parameters( “....Text OleDbCommand2.Parameters( “ address “ ).Value = TextBox5.Text OleDbCommand2.Parameters(...“ city “ ).Value = TextBox6.Text OleDbCommand2.Parameters( “ st “ ).Value = TextBox7....Text OleDbCommand2.Parameters( “ zip “ ).Value = TextBox8.Text OleDbCommand2.Parameters( “
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