.net串連oracle資料庫---Shinepans，oracle---shinepans

.net串連oracle資料庫---Shinepans，oracle---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類管理通用的字串.方便管理,通過上面的代碼就可以知道連接字串了.

3.查詢:
 
查詢格式如上

運行結果:1.登入:


2.登入結果:


3.顯示主介面 (測試)


4.查詢資料庫:





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>        /// 應用程式的主進入點。        /// </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("已串連到Oracle資料庫!");                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("已串連到Oracle資料庫!");                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.