一:通过System.Data.OracleClient(需要安装Oracle客户端并配置tnsnames.ora) 1. 添加命名空间System.Data.OracleClient引用 2. using System.Data.OracleClient; 3. string connString = "User ID=IFSAPP;Password=IFSAPP;Data Source=RACE;"; OracleConnection conn = new OracleConnection(connString); try { conn.Open(); MessageBox.Show(conn.State.ToString()); } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); } 二:通过System.Data.OracleClient(需要安装Oracle客户端不需配置tnsnames.ora) 1. 添加命名空间System.Data.OracleClient引用 2. using System.Data.OracleClient; 3. string connString = "User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))"; OracleConnection conn = new OracleConnection(connString); try { conn.Open(); MessageBox.Show(conn.State.ToString()); } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); } 三:通过System.Data.OleDb和Oracle公司的驱动 1. 添加命名空间System.Data.OracleClient引用 2. using System.Data.OleDb; 3. string connString = "Provider=OraOLEDB.Oracle.1;User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))"; OleDbConnection conn = new OleDbConnection(connString); try { conn.Open(); MessageBox.Show(conn.State.ToString()); } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); } 四:通过System.Data.OleDb和微软公司的Oracle驱动 1. 添加命名空间System.Data.OracleClient引用 2. using System.Data.OleDb; 3. string connString = "Provider=MSDAORA.1;User ID=IFSAPP;Password=IFSAPP;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RACE)))"; OleDbConnection cnn = new OleDbConnection(connString); try { conn.Open(); MessageBox.Show(conn.State.ToString()); } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); } 备注: a.XP操作系统已经安装了微软公司的Oracle驱动C:\Program Files\Common Files\System\Ole DB\msdaora.dll b.该驱动需要Oracle客户端的三个文件(oraocixe10.dll、oci.dll、ociw32.dll)放在System32下即可 五:使用ODP连接 1. 下载安装ODP.NET(http://www.oracle.com/technetwork/developer-tools/visual-studio/downloads/index.html) 2. 安装完全成后会产生一序列文件。 3. 找到这个安装目录,打开文件夹%ORACLE_HOME%\Network\Admin在这个下面建立一个tnsnames.ora的文件,其内容可以参考其下的Sample目录下面的配置 Oracle.RACE = (DESCRIPTION= (ADDRESS_LIST= (ADDRESS= (PROTOCOL=TCP) (HOST=127.0.0.1) (PORT=1521) ) ) (CONNECT_DATA= (SID=RACE) (SERVER=DEDICATED) ) ) Oracle.RACE为连接字符串名称,可以随便取。等号后面的字符串可以在Enterprise Manager Console工具中连接数据库后的TNS描述符中拷过来 4. 引用Oracle.DataAccess命名空间 5. using Oracle.DataAccess.Client; 6. 示例代码: string connString = "DATA SOURCE=Oracle.RACE;PERSIST SECURITY INFO=True;USER ID=IFSAPP;password=IFSAPP"; OracleConnection conn = new OracleConnection(connString); try { conn.Open(); OracleCommand cmd = new OracleCommand(cmdText,conn); OracleDataReader reader = cmd.ExecuteReader(); this.DataGridView1.DataSource = reader; this.DataGridView1.DataBind(); } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); } 六:使用第三方驱动 第三方驱动有 Devart,下载驱动 http://www.devart.com/dotconnect/oracle/,但是是商业版,需要购买许可或破解 连接格式 User ID=myUsername;Password=myPassword;Host=ora;Pooling=true;Min Pool Size=0;Max Pool Size=100;Connection Lifetime=0; 1. 引用Devart.Data.Oracle命名空间 2. using Devart.Data.Oracle; 3. OracleConnection conn = new OracleConnection(); conn.ConnectionString = ""; conn.Unicode = true; conn.UserId = "IFSAPP"; conn.Password = "IFSAPP"; conn.Port = 1521; conn.Server = "127.0.0.1"; conn.Sid = "RACE"; try { conn.Open(); //execute queries, etc } catch (Exception ex) { ShowErrorMessage(ex.Message.ToString()); } finally { conn.Close(); }