数据库DAL学习(1)

以前从未接触过网页设计（好吧，小学粗浅的学过），因此对asp.net并不是特别熟悉。

然而C#连接数据库在上学期的已经自己尝试做过一个管理系统，并且取得了成功。（我不想承认我用的是Acess)

部分代码如下

private void button1_Click(object sender, EventArgs e)
        {

            string strConnection = "Provider=Microsoft.ACE.OLEDB.12.0;";
            strConnection += @"Data Source=Database.accdb";
            OleDbConnection objConnection = new OleDbConnection(strConnection);
            if (comboBox1.Text == "系统管理员")
            {
                objConnection.Open();
                OleDbCommand comm = new OleDbCommand("select * from 系统管理员 where User='" + textBox1.Text + "'AND Code='" + textBox2.Text + "'", objConnection);
                OleDbDataReader sda = comm.ExecuteReader();
                sda.Read();
                if (log(sda) == 1)
                {
                    系统管理员 f = new 系统管理员();
                    f.Show();
                }
            }
            if (comboBox1.Text == "项目管理员")
            {
                objConnection.Open();
                OleDbCommand comm = new OleDbCommand("select * from 项目管理员 where User='" + textBox1.Text + "'AND Code='" + textBox2.Text + "'", objConnection);
                OleDbDataReader sda = comm.ExecuteReader();
                sda.Read();
                if (log(sda) == 1)
                {
                    项目管理员 f = new 项目管理员(""+textBox1.Text+"");
                    f.Show();
                }
            }
            if (comboBox1.Text == "项目经理")
            {
                objConnection.Open();
                OleDbCommand comm = new OleDbCommand("select * from 项目经理 where User='" + textBox1.Text + "'AND Code='" + textBox2.Text + "'", objConnection);
                OleDbDataReader sda = comm.ExecuteReader();
                sda.Read();
                if (log(sda) == 1)
                {
                    项目经理 f = new 项目经理(""+textBox1.Text+"");
                    f.Show();
                }
            }
            if (comboBox1.Text == "项目组员")
            {
                objConnection.Open();
                OleDbCommand comm = new OleDbCommand("select * from 项目组员 where User='" + textBox1.Text + "'AND Code='" + textBox2.Text + "'", objConnection);
                OleDbDataReader sda = comm.ExecuteReader();
                sda.Read();
                if (log(sda)==1)
                {
                    项目组员 f = new 项目组员(""+textBox1.Text+"");
                    f.Show();
                }
            }
            if (comboBox1.Text == "总经理")
            {
                objConnection.Open();
                OleDbCommand comm = new OleDbCommand("select * from 总经理 where User='" + textBox1.Text + "'AND Code='" + textBox2.Text + "'", objConnection);
                OleDbDataReader sda = comm.ExecuteReader();
                sda.Read();
                if (log(sda)==1)
                {
                    总经理 f = new 总经理();
                    f.Show();
                }
            }
        }
        public int log(OleDbDataReader test)
        {
            if (test.HasRows == true)
            {
                MessageBox.Show("登陆成功");
                this.Hide();
                return 1;
            }
            else
            {
                MessageBox.Show("用户名或密码错误");
                return 0;
            }
        }

而sql server的调动基本与access是一样的。（未完待续）