oracle 连接字符串

Dear 丶 2022-03-28 07:24 1384阅读 0赞

.net 中引用  System.Data.OracleClient;

using System.Data;
    using System.Data.OracleClient;
    using System.Configuration;
    using System.Collections;
    
    
    namespace Entity
    {
        /// <summary>
        /// 操作Oracle数据库
        /// </summary>
    
        public class OracleHelper
        {
            public OracleConnection conn = new OracleConnection();//连接对象
            protected OracleCommand cmd = new OracleCommand();  //命令对象
            // Read the connection strings from the configuration file
            //public readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["OraConnString1"].ConnectionString;
            //public readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString2"].ConnectionString;
            //public readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString3"].ConnectionString;
            //public readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["OraProfileConnString"].ConnectionString;
            //public readonly string ConnectionStringMembership = ConfigurationManager.ConnectionStrings["OraMembershipConnString"].ConnectionString;
    
            //Create a hashtable for the parameter cached
            private Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
            protected readonly string ConnectStr = ConfigurationManager.ConnectionStrings["oracle"].ToString();
            
    
            public OracleHelper()
            {
               
            }
    
            public bool OpenDB()
            {
                try
                {
                    conn.ConnectionString = ConnectStr;
                    cmd.Connection = conn;
                    conn.Open();
                    return true;
                }
                catch
                {
                    return false;
                }
            }
    
            public bool CloseDB()
            {
                try
                {
                    if (conn.State == ConnectionState.Open)
                    {
                        conn.Close();
                        conn.Dispose();
                        cmd.Dispose();
                    }
                    return true;
                }
                catch
                {
                    return false;
                }
            }
            
            /**/
            /**/
            /**/
            /// <summary>
            /// Execute a database query which does not include a select
            /// </summary>
            /// <param name="cmdType">Command type either stored procedure or SQL</param>
            /// <param name="cmdText">Acutall SQL Command</param>
            /// <param name="commandParameters">Parameters to bind to the command</param>
            /// <returns></returns>
            public int ExecuteNonQuery(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
            {
                try
                {
                    PrepareCommand(null, cmdType, cmdText, commandParameters);
                    int val = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return val;
                }
                finally
                {
                    CloseDB();
                }
            }
    
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Execute a select query that will return a result set
            /// </summary>
            /// <param name="connString">Connection string</param>
             <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or PL/SQL command</param>
            /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
            /// <returns></returns>
            public OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
            {
                try
                {
                    //Prepare the command to execute
                    PrepareCommand(null, cmdType, cmdText, commandParameters);
                    OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    cmd.Parameters.Clear();
                    return rdr;
                }
                catch
                {
                    conn.Close();
                    throw;
                }
                finally
                {
    
                }
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Execute an OracleCommand that returns the first column of the first record against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  Object obj = ExecuteScalar(CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
            /// </remarks>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or PL/SQL command</param>
            /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
            /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
            public object ExecuteScalar(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
            {
                try
                {
                    PrepareCommand(null, cmdType, cmdText, commandParameters);
                    object val = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    return val;
                }
                finally
                {
                    CloseDB();
                }
            }
    
            /// <summary>
            /// 执行一条返回结果集的SqlCommand命令，通过已有的连接字符串。
            /// 使用参数数组提供参数
            /// </summary>
            /// <remarks>
            /// 使用示例： 
            /// DateSet ds = ExecuteDataSet(CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
            /// </remarks>
            /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
            /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
            /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
            /// <returns>返回一个包含结果的DataSet</returns>
            public DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
            {
                try
                {
                    PrepareCommand(null, cmdType, cmdText, commandParameters);
                    OracleDataAdapter adapter = new OracleDataAdapter(cmd);
                    DataSet ds = new DataSet();
                    adapter.Fill(ds);
                    return ds;
                }
                finally
                {
                    cmd.Parameters.Clear();
                    CloseDB();
                }
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Add a set of parameters to the cached
            /// </summary>
            /// <param name="cacheKey">Key value to look up the parameters</param>
            /// <param name="commandParameters">Actual parameters to cached</param>
            public void CacheParameters(string cacheKey, params OracleParameter[] commandParameters)
            {
                parmCache[cacheKey] = commandParameters;
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Fetch parameters from the cache
            /// </summary>
            /// <param name="cacheKey">Key to look up the parameters</param>
            /// <returns></returns>
            public OracleParameter[] GetCachedParameters(string cacheKey)
            {
                OracleParameter[] cachedParms = (OracleParameter[])parmCache[cacheKey];
    
                if (cachedParms == null)
                    return null;
    
                // If the parameters are in the cache
                OracleParameter[] clonedParms = new OracleParameter[cachedParms.Length];
    
                // return a copy of the parameters
                for (int i = 0, j = cachedParms.Length; i < j; i++)
                    clonedParms[i] = (OracleParameter)((ICloneable)cachedParms[i]).Clone();
    
                return clonedParms;
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Internal function to prepare a command for execution by the database
            /// </summary>
            /// <param name="cmd">Existing command object</param>
            /// <param name="conn">Database connection object</param>
            /// <param name="trans">Optional transaction object</param>
            /// <param name="cmdType">Command type, e.g. stored procedure</param>
            /// <param name="cmdText">Command test</param>
            /// <param name="commandParameters">Parameters for the command</param>
            private void PrepareCommand(OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
            {
    
                OpenDB();
                cmd.CommandText = cmdText;
                cmd.CommandType = cmdType;
    
                //Bind it to the transaction if it exists
                if (trans != null)
                    cmd.Transaction = trans;
    
                // Bind the parameters passed in
                if (commandParameters != null)
                {
                    foreach (OracleParameter parm in commandParameters)
                        cmd.Parameters.Add(parm);
                }
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Converter to use boolean data type with Oracle
            /// </summary>
            /// <param name="value">Value to convert</param>
            /// <returns></returns>
            public string OraBit(bool value)
            {
                if (value)
                    return "Y";
                else
                    return "N";
            }
    
            /**/
            /**/
            /**/
            /// <summary>
            /// Converter to use boolean data type with Oracle
            /// </summary>
            /// <param name="value">Value to convert</param>
            /// <returns></returns>
            public bool OraBool(string value)
            {
                if (value.Equals("Y"))
                    return true;
                else
                    return false;
            }
        }
    }