C#连接数据库不安装Oracle客户端

Oracle提供了这样的Oracle.ManagedDataAccess.dll，让用可以需要安装Oracle客户端即可连接数据库，并且不区分32位和64位。

1.引用

选择引用，找到对应文件目录下的DLL引用即可。

修改连接字符串

string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=" + hostaddress + ")(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=" + servername + ")));Persist Security Info=True;User ID=" + uid + ";Password=" + pwd + ";";

3.连接数库的代码

public class ConnForOracle
    {
        protected OracleConnection Connection;
        private string connectionString;
        public ConnForOracle()
        {
            string connStr;
            connStr = “改成你自己的连接字符串即可”
            connectionString = connStr;
            Connection = new OracleConnection(connectionString);
        }

#region 带参数的构造函数
        /// 带参数的构造函数
        /// 数据库联接字符串
        public ConnForOracle(string ConnString)
        {
            string connStr;
            connStr = System.Configuration.ConfigurationSettings.AppSettings[ConnString].ToString();
            Connection = new OracleConnection(connStr);
        }
        #endregion

#region 打开数据库
        /// 打开数据库
        public void OpenConn()
        {
            if (this.Connection.State != ConnectionState.Open)
                this.Connection.Open();
        }
        #endregion
        #region 关闭数据库联接
        /// 关闭数据库联接
        public void CloseConn()
        {
            if (Connection.State == ConnectionState.Open)
                Connection.Close();
        }
        #endregion

#region 执行SQL语句，返回数据到DataSet中
        /// 执行SQL语句，返回数据到DataSet中
        /// sql语句
        /// 自定义返回的DataSet表名
        /// 返回DataSet
        public DataSet ReturnDataSet(string sql, string DataSetName)
        {
            DataSet dataSet = new DataSet();
            OpenConn();
            OracleDataAdapter OraDA = new OracleDataAdapter(sql, Connection);
            OraDA.Fill(dataSet, DataSetName);
            //  CloseConn();
            return dataSet;
        }

}

4.显示查询结果