.net連接oracle數據庫---Shinepans

.net連接oracle數據庫---Shinepans

常見問題:

1.缺少引用 解決辦法 ,添加引用:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.Common;
using Oracle.DataAccess;

2.連接字符串:

 globals.connectionString = "Data Source="+this.databaseName.Text.Trim()+";uid="+this.username.Text.Trim()+";pwd="+this.password.Text.Trim()+";";
            globals.username = this.username.Text.Trim();
            globals.databaseName = this.databaseName.Text.Trim();

這是我的一貫風格,喜歡用globals類管理通用的字符串.方便管理,通過上面的代碼就可以知道連接字符串了.

3.查詢:

查詢格式如上

運行結果:

1.登錄:


2.登錄結果:


3.顯示主界面 (測試)


4.查詢數據庫:





至此,查詢功能已完成

關鍵點:

1.查詢語句中,不要帶分號,會提示關鍵字錯誤
2.引用要添加好:
using System.Data.Common;
using Oracle.DataAccess;
3.連接字符串要寫好:
"Data Source=shinepans;uid=system;pwd=123;unicode=True"

上面的改寫成你的


代碼片:
Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace Net3._5_oracleTest
{
    static class Program
    {
        /// <summary>
        /// 應用程序的主入口點。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new LoginForm());
        }
    }
}

LoginForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Net3._5_oracleTest
{
    public partial class LoginForm : Form
    {
        public LoginForm()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            globals.connectionString = "Data Source="+this.databaseName.Text.Trim()+";uid="+this.username.Text.Trim()+";pwd="+this.password.Text.Trim()+";";
            globals.username = this.username.Text.Trim();
            globals.databaseName = this.databaseName.Text.Trim();
            OracleConnection conn = new OracleConnection(globals.connectionString);
            try
            {
                conn.Open();
                MessageBox.Show("已連接到Oracle數據庫!");
                MainForm mf = new MainForm();
                this.Hide();
                mf.Show();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }finally
            {
                conn.Close();
            }
        }
    }
}

MainForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Net3._5_oracleTest
{
    public partial class LoginForm : Form
    {
        public LoginForm()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            globals.connectionString = "Data Source="+this.databaseName.Text.Trim()+";uid="+this.username.Text.Trim()+";pwd="+this.password.Text.Trim()+";";
            globals.username = this.username.Text.Trim();
            globals.databaseName = this.databaseName.Text.Trim();
            OracleConnection conn = new OracleConnection(globals.connectionString);
            try
            {
                conn.Open();
                MessageBox.Show("已連接到Oracle數據庫!");
                MainForm mf = new MainForm();
                this.Hide();
                mf.Show();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }finally
            {
                conn.Close();
            }
        }
    }
}

GridView_UserInfo.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OracleClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.Common;
using Oracle.DataAccess;

namespace Net3._5_oracleTest
{
    public partial class GrideViews_UserInfo : Form
    {
        public GrideViews_UserInfo()
        {
            InitializeComponent();
        }

        private void GrideViews_UserInfo_Load(object sender, EventArgs e)
        {
            string sql1 = "SELECT * FROM infoofuser";
            OracleConnection myconn = new OracleConnection(globals.connectionString);
            OracleCommand mycmd = myconn.CreateCommand();
            mycmd.CommandText = sql1;
            myconn.Open();
            OracleDataAdapter oraDA = new OracleDataAdapter(mycmd);
            DataSet ds = new DataSet();
            oraDA.Fill(ds);
            myconn.Close();
            DataTable dtbl = ds.Tables[0];
            this.dataGridView1.DataSource = dtbl;
        }
    }
}

總結:

如果你的引用沒有我說的兩個,需要在項目裡找引用,然後右鍵選擇添加

這個是大家都知道的,oracle的各種錯誤讓人煩惱不已,各種錯誤,幸好有百度,可以查詢錯在哪裡,所以不要害怕困難,多總結.