C#OleDbCommand是干什么的

C#OleDbCommand是干什么的

连接数据库的命令过程，，用法如下：OleDbCommand 的用法 OleDbConnection 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();OleDbConnection con=new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; data source=data.mdb");con.Open();OleDbCommand dc=new OleDbCommand("insert into us (name) values (11)", con);dc.ExecuteNonQuery();con.Close();string us=textBox2.Text;string pa=textBox1.Text;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)", con);oldC.Parameters.Add("@username", us);oldC.Parameters.Add("@userpassword", pa);con.Open();oldC.ExecuteNonQuery();con.Close();MessageBox.Show("Register successful!");this.Dispose();