C#连接Oracle数据库（执行增删改查操作）

C#连接Oracle数据库（执行增删改查操作）

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c# c#Oracle数据库连接类 c#操作Oracle数据库 c#对Oracle数据库增删改查 

C#中Oracle数据库的连接类

1.C#连接Oracle数据库，首先需要在引用中添加System.Data.OracleClient组件

2.在类中引用System.Data.OracleClient组件：using System.Data.OracleClient

3.打开Oracle数据库连接

   在打开数据库连接时，根据实际情况，我们把连接的字符串信息写在xml配置文件中，读取xml配置文件获取连接信息字符串。

配置文件信息如下：

注意：配置文件需要放在项目实际目录下的bin\Release中

 config.xml

 "1.0" encoding="utf-8" ?>


         server=192.168.1.189;uid=AAMS;pwd=111111;data source=orcl
         Password=111111;User ID=AAMS;Data Source=ORCL;Persist Security Info=True

 读取xml配置文件信息：

 ///
         /// 获取XML文件中对应节点的值
         ///
         ///
         ///
         public static string getXmlValue(string nodeName)
         {
             string s = "";
             string nodeValue = "";
             //需要using System.Xml
             XmlDocument xd = new XmlDocument();
             xd.Load(Program.PATH + "\\config.xml");
             XmlNodeReader xnr = new XmlNodeReader(xd);
             while (xnr.Read())
             {
                 switch (xnr.NodeType)
                 {
                     case XmlNodeType.Element:
                         s = xnr.Name;
                         break;
                     case XmlNodeType.Text:
                         if (s.Equals(nodeName))
                         {
                             nodeValue = xnr.Value;
                         }
                         break;
                 }
             }
             return nodeValue;
         }

 打开数据库连接

 public static string connString = "";
         public static OracleConnection conn = null;

         //打开数据库连接
         public static bool Open()
         {
             //从配置文件中获取连接字符串
             //配置文件需要放在项目目录下的bin\Release中
             connString = getXmlValue("connString");
             conn = new OracleConnection(getXmlValue("connString"));
             try
             {
                 conn.Open();
                 Console.WriteLine("数据库连接成功");
                 return true;
             }
             catch (System.Exception ex)
             {
                 Console.Write(ex.Message);
                 MessageBox.Show("未能连接到数据库");
                 return false;
             }

 4.关闭数据库连接

 public static void Close()
         {
             if (conn != null)
             {
                 conn.Close();
                 conn.Dispose();
                 conn = null;
                 Console.WriteLine("数据库关闭成功");
             }
         }

 5.添加数据（使用拼接sql语句的方法）

 public static int insert(int ruleId, int equipmentId, String equipmentName, String propertyName, int ruleType, String ruleRequest, String ruleRequestOther, String ruleExplain)
         {
             String sql = "insert into Device_Attr t(CA_ID,BASEID,BASENAME,CA_NAME,CA_RULETYPE,CA_RULETEXT,CA_RULETEXT2,t.CONTENT) values(" + ruleId + "," + equipmentId + ",'" + equipmentName + "$','" + propertyName + "','" + ruleType + "','" + ruleRequest + "','" + ruleRequestOther + "','" + ruleExplain + "')";
             Console.WriteLine(sql);
             OracleCommand oc = new OracleCommand(sql, conn);
             int result = oc.ExecuteNonQuery();
             return result;
         }

 6.删除数据

 public static int delete(string sql)
         {
             OracleCommand cmd = new OracleCommand(sql, conn);
             int result = cmd.ExecuteNonQuery();
             return result;
         }

 7.修改数据（使用参数的方法，与添加数据用的是两种方法，这两种方法都可行）

 public static int update(int ruleId, int equipmentId, String equipmentName, String propertyName, int ruleType, String ruleRequest, String ruleRequestOther, String ruleExplain)
         {
             String sql = "update Device_Attr t set t.BASEID = :equipmentId, t.BASENAME = :equipmentName,t.CA_NAME = :propertyName,t.CA_RULETYPE = :ruleType,t.CA_RULETEXT = :ruleRequest,t.CA_RULETEXT2 = :ruleRequestOther,t.CONTENT = :ruleExplain where t.CA_ID =:ruleId";
                 OracleCommand cmd = new OracleCommand(sql, conn);
             OracleParameter param_1 = new OracleParameter(":equipmentId", equipmentId);
             cmd.Parameters.Add(param_1);
             OracleParameter param_2 = new OracleParameter(":equipmentName", equipmentName + "$");
             cmd.Parameters.Add(param_2);
             OracleParameter param_3 = new OracleParameter(":propertyName", propertyName);
             cmd.Parameters.Add(param_3);
             OracleParameter param_4 = new OracleParameter(":ruleType", ruleType);
             cmd.Parameters.Add(param_4);
             OracleParameter param_5 = new OracleParameter(":ruleRequest", ruleRequest);
             cmd.Parameters.Add(param_5);
             OracleParameter param_6 = new OracleParameter(":ruleRequestOther", ruleRequestOther);
             cmd.Parameters.Add(param_6);
             OracleParameter param_7 = new OracleParameter(":ruleExplain", ruleExplain);
             cmd.Parameters.Add(param_7);
             OracleParameter param_8 = new OracleParameter(":ruleId", ruleId);
             cmd.Parameters.Add(param_8);
             int result = cmd.ExecuteNonQuery();
             return result;
         }

 8.查询数据

 public static OracleDataReader QueryForReader(string sql)
         {
             try
             {
                 OracleCommand cmd = conn.CreateCommand();
                 cmd.CommandText = sql;
                 OracleDataReader dtr = cmd.ExecuteReader();
                 return dtr;
             }
             catch (System.Exception ex)
             {
                 Console.WriteLine(ex.ToString());
                 return null;
             }
         }