Question

C#OleDbCommand是干什么的

Answer 1

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();

Answer 2

我也是初学者,照我的理解 :
OleDbCommand是对数据源执行各种操作的SQL语句或者存储过程

Answer 3

连接access进行数据操作时候用到的。。
其实和sqlcommand差不多用法

Answer 4

执行access数据库命令

Answer 5

OleDbCommand表示要对access数据源执行的sql语句或存储过程。
具体用法：

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();