DbResourceAllocator.cs source code in C# .NET

                        
Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / Hosting / DbResourceAllocator.cs / 1305376 / DbResourceAllocator.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

#region Using directives 
 
using System;
using System.Collections.Specialized; 
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.OleDb; 
using System.Data.SqlClient;
using System.Diagnostics; 
using System.Globalization; 
using System.Text.RegularExpressions;
using System.Transactions; 
using System.Threading;

#endregion
 
namespace System.Workflow.Runtime.Hosting
{ 
    /// 
 
    /// Local database providers we support
    /// 
 
    internal enum Provider
    {
        SqlClient = 0,
        OleDB = 1 
    }
 
    /// 
 
    /// Internal Database access abstraction to
    /// - abstract the derived Out-of-box SharedConnectionInfo from all DB hosting services 
    /// - provide uniform connection string management
    /// - and support different database providers
    /// 
    internal sealed class DbResourceAllocator 
    {
        const string EnlistFalseToken = ";Enlist=false"; 
        internal const string ConnectionStringToken = "ConnectionString"; 

        string connString; 
        Provider localProvider;

        /// 

        /// Initialize the object by getting the connection string from the parameter or 
        /// out of the configuration settings
        /// 
 
        ///  
        /// 
        ///  
        internal DbResourceAllocator(
            WorkflowRuntime runtime,
            NameValueCollection parameters,
            string connectionString) 
        {
            // If connection string not specified in input, search the config sections 
            if (String.IsNullOrEmpty(connectionString)) 
            {
                if (parameters != null) 
                {
                    // First search in this service's parameters
                    foreach (string key in parameters.AllKeys)
                    { 
                        if (string.Compare(ConnectionStringToken, key, StringComparison.OrdinalIgnoreCase) == 0)
                        { 
                            connectionString = parameters[ConnectionStringToken]; 
                            break;
                        } 
                    }
                }
                if (String.IsNullOrEmpty(connectionString) && (runtime != null))
                { 
                    NameValueConfigurationCollection commonConfigurationParameters = runtime.CommonParameters;
                    if (commonConfigurationParameters != null) 
                    { 
                        // Then scan for connection string in the common configuration parameters section
                        foreach (string key in commonConfigurationParameters.AllKeys) 
                        {
                            if (string.Compare(ConnectionStringToken, key, StringComparison.OrdinalIgnoreCase) == 0)
                            {
                                connectionString = commonConfigurationParameters[ConnectionStringToken].Value; 
                                break;
                            } 
                        } 
                    }
                } 

                // If no connectionString parsed out of the params, inner layer throws
                //   System.ArgumentNullException: Connection string cannot be null or empty
                //   Parameter name: connectionString 
                // But this API caller does not have connectionString param.
                // So throw ArgumentException with the original message. 
                if (String.IsNullOrEmpty(connectionString)) 
                    throw new ArgumentNullException(ConnectionStringToken, ExecutionStringManager.MissingConnectionString);
            } 

            Init(connectionString);
        }
 
        #region Accessors
 
        internal string ConnectionString 
        {
            get { return this.connString; } 
        }

        #endregion Accessors
 

        #region Internal Methods 
        /// 
 
        /// Disallow the hosting service to have different connection string if using SharedConnectionWorkflowTransactionService
        /// Should be called after all hosting services are added to the WorkflowRuntime 
        /// 
        /// 
        internal void DetectSharedConnectionConflict(WorkflowCommitWorkBatchService transactionService)
        { 
            SharedConnectionWorkflowCommitWorkBatchService sharedConnectionTransactionService = transactionService as SharedConnectionWorkflowCommitWorkBatchService;
            if (sharedConnectionTransactionService != null) 
            { 
                if (String.Compare(sharedConnectionTransactionService.ConnectionString, this.connString, StringComparison.Ordinal) != 0)
                    throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, 
                        ExecutionStringManager.SharedConnectionStringSpecificationConflict, this.connString, sharedConnectionTransactionService.ConnectionString));
            }

        } 

        #region Get a connection 
 
        internal DbConnection OpenNewConnection()
        { 
            // Always disallow AutoEnlist since we enlist explicitly when necessary
            return OpenNewConnection(true);
        }
 
        internal DbConnection OpenNewConnectionNoEnlist()
        { 
            return OpenNewConnection(true); 
        }
 
        internal DbConnection OpenNewConnection(bool disallowEnlist)
        {
            DbConnection connection = null;
            string connectionStr = this.connString; 

            if (disallowEnlist) 
 				connectionStr += DbResourceAllocator.EnlistFalseToken; 

            if (this.localProvider == Provider.SqlClient) 
				connection = new SqlConnection(connectionStr);
            else
				connection = new OleDbConnection(connectionStr);
 
            connection.Open();
 
            return connection; 
        }
 
        /// 

        /// Gets a connection enlisted to the transaction.
        /// If the transaction already has a connection attached to it, we return that,
        /// otherwise we create a new connection and enlist to the transaction 
        /// 
        ///  
        /// output if we created a connection 
        /// 
        internal DbConnection GetEnlistedConnection(WorkflowCommitWorkBatchService txSvc, Transaction transaction, out bool isNewConnection) 
        {
            DbConnection connection;
            SharedConnectionInfo connectionInfo = GetConnectionInfo(txSvc, transaction);
 
            if (connectionInfo != null)
            { 
                connection = connectionInfo.DBConnection; 
                Debug.Assert((connection != null), "null connection");
                Debug.Assert((connection.State == System.Data.ConnectionState.Open), 
                    "Invalid connection state " + connection.State + " for connection " + connection);

                isNewConnection = false;
            } 
            else
            { 
                connection = this.OpenNewConnection(); 
                connection.EnlistTransaction(transaction);
 
                isNewConnection = true;
            }

            return connection; 
        }
 
        #endregion Get a connection 

        #region Get Local Transaction 

        internal static DbTransaction GetLocalTransaction(WorkflowCommitWorkBatchService txSvc, Transaction transaction)
        {
            DbTransaction localTransaction = null; 
            SharedConnectionInfo connectionInfo = GetConnectionInfo(txSvc, transaction);
 
            if (connectionInfo != null) 
                localTransaction = connectionInfo.DBTransaction;
 
            return localTransaction;
        }

        #endregion Get Local Transaction 

        #region Get a command object for querying 
 
        internal DbCommand NewCommand()
        { 
            DbConnection dbConnection = OpenNewConnection();
            return DbResourceAllocator.NewCommand(dbConnection);
        }
 
        internal static DbCommand NewCommand(DbConnection dbConnection)
        { 
            return NewCommand(null, dbConnection, null); 
        }
        internal static DbCommand NewCommand(string commandText, DbConnection dbConnection, DbTransaction transaction) 
        {
            DbCommand command = dbConnection.CreateCommand();
            command.CommandText = commandText;
            command.Transaction = transaction; 

            return command; 
        } 

        #endregion Get a command object for querying 

        #region build a command parameter object for a stored procedure

        internal DbParameter NewDbParameter() 
        {
            return NewDbParameter(null, null); 
        } 

        internal DbParameter NewDbParameter(string parameterName, DbType type) 
        {
            if (this.localProvider == Provider.SqlClient)
            {
                if (type == DbType.Int64) 
                    return new SqlParameter(parameterName, SqlDbType.BigInt);
                else 
                    return new SqlParameter(parameterName, type); 
            }
            else 
            {

                if (type == DbType.Int64)
                    return new OleDbParameter(parameterName, OleDbType.BigInt); 
                else
                    return new OleDbParameter(parameterName, type); 
            } 
        }
 
        internal DbParameter NewDbParameter(string parameterName, DbType type, ParameterDirection direction)
        {
            DbParameter parameter = NewDbParameter(parameterName, type);
            parameter.Direction = direction; 

            return parameter; 
        } 

        internal DbParameter NewDbParameter(string parameterName, object value) 
        {
            if (this.localProvider == Provider.SqlClient)
                return new SqlParameter(parameterName, value);
            else 
                return new OleDbParameter(parameterName, value);
        } 
 
#endregion build a command parameter object for a stored procedure
 
#endregion Public Methods


#region Private Helpers 

        private void Init(string connectionStr) 
        { 
			SetConnectionString(connectionStr);
 
            try
            {
                // Open a connection to see if it's a valid connection string
                using (DbConnection connection = this.OpenNewConnection(false)) 
                {
                } 
            } 
            catch (Exception e)
            { 
                throw new ArgumentException(ExecutionStringManager.InvalidDbConnection, "connectionString", e);
            }

            // OLEDB connection pooling causes this exception in ExecuteInsertWorkflowInstance 
            // "Cannot start more transactions on this session."
            // Disable pooling to avoid dirty connections. 
            if (this.localProvider == Provider.OleDB) 
                this.connString = String.Concat(this.connString, ";OLE DB Services=-4");
        } 

        private void SetConnectionString(string connectionString)
        {
            if (String.IsNullOrEmpty(connectionString) || String.IsNullOrEmpty(connectionString.Trim())) 
                throw new ArgumentNullException("connectionString", ExecutionStringManager.MissingConnectionString);
 
            DbConnectionStringBuilder dcsb = new DbConnectionStringBuilder(); 
            dcsb.ConnectionString = connectionString;
 
            // Don't allow the client to specify an auto-enlist value since we decide whether to participate in a transaction
            // (enlist for writing and not for reading).
            if (dcsb.ContainsKey("enlist"))
            { 
                throw new ArgumentException(ExecutionStringManager.InvalidEnlist);
            } 
 
            this.connString = connectionString;
            // 
            // We only support sqlclient, sql is the only data store our OOB services talk to.
            localProvider = Provider.SqlClient;
        }
        /* 
        private void SetLocalProvider(string connectionString)
        { 
            // Assume caller already validated the connection string 
            MatchCollection providers = Regex.Matches(connectionString, @"(^|;)\s*provider\s*=[^;$]*(;|$)", RegexOptions.IgnoreCase);
 
            // Cannot use DbConnectionStringBuilder because it selects the last provider, not the first one, by itself.
            // A legal Sql connection string allows for multiple provider specification and
            // selects the first provider
            if (providers.Count > 0) 
            {
                // Check if the first one matches "sqloledb" or "sqloledb." 
                if (Regex.IsMatch(providers[0].Value, @"provider\s*=\s*sqloledb(\.\d+)?\s*(;|$)", RegexOptions.IgnoreCase)) 
                {
                    this.localProvider = Provider.OleDB; 
                }
                else
                {
                    // We don't support other providers 
                    throw new ArgumentException(String.Format(CultureInfo.CurrentCulture,ExecutionStringManager.UnsupportedSqlProvider, providers[0].Value));
                } 
            } 
            else
            { 
                // SqlClient provider requires no provider keyword specified in connection string
                this.localProvider = Provider.SqlClient;
            }
        } 
        */
 
        private static SharedConnectionInfo GetConnectionInfo(WorkflowCommitWorkBatchService txSvc, Transaction transaction) 
        {
            SharedConnectionInfo connectionInfo = null; 

 			SharedConnectionWorkflowCommitWorkBatchService scTxSvc = txSvc as SharedConnectionWorkflowCommitWorkBatchService;
            if (scTxSvc != null)
			{ 
                connectionInfo = scTxSvc.GetConnectionInfo(transaction);
 
                // The transaction service can't find entry if the transaction has been completed. 
                // be sure to propate the error so durable services can cast to appropriate exception
                if (connectionInfo == null) 
                    throw new ArgumentException(
                        String.Format(CultureInfo.CurrentCulture,ExecutionStringManager.InvalidTransaction));
            }
            return connectionInfo; 
        }
 
#endregion Private Helpers 
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

#region Using directives 
 
using System;
using System.Collections.Specialized; 
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.OleDb; 
using System.Data.SqlClient;
using System.Diagnostics; 
using System.Globalization; 
using System.Text.RegularExpressions;
using System.Transactions; 
using System.Threading;

#endregion
 
namespace System.Workflow.Runtime.Hosting
{ 
    /// 
 
    /// Local database providers we support
    /// 
 
    internal enum Provider
    {
        SqlClient = 0,
        OleDB = 1 
    }
 
    /// 
 
    /// Internal Database access abstraction to
    /// - abstract the derived Out-of-box SharedConnectionInfo from all DB hosting services 
    /// - provide uniform connection string management
    /// - and support different database providers
    /// 
    internal sealed class DbResourceAllocator 
    {
        const string EnlistFalseToken = ";Enlist=false"; 
        internal const string ConnectionStringToken = "ConnectionString"; 

        string connString; 
        Provider localProvider;

        /// 

        /// Initialize the object by getting the connection string from the parameter or 
        /// out of the configuration settings
        /// 
 
        ///  
        /// 
        ///  
        internal DbResourceAllocator(
            WorkflowRuntime runtime,
            NameValueCollection parameters,
            string connectionString) 
        {
            // If connection string not specified in input, search the config sections 
            if (String.IsNullOrEmpty(connectionString)) 
            {
                if (parameters != null) 
                {
                    // First search in this service's parameters
                    foreach (string key in parameters.AllKeys)
                    { 
                        if (string.Compare(ConnectionStringToken, key, StringComparison.OrdinalIgnoreCase) == 0)
                        { 
                            connectionString = parameters[ConnectionStringToken]; 
                            break;
                        } 
                    }
                }
                if (String.IsNullOrEmpty(connectionString) && (runtime != null))
                { 
                    NameValueConfigurationCollection commonConfigurationParameters = runtime.CommonParameters;
                    if (commonConfigurationParameters != null) 
                    { 
                        // Then scan for connection string in the common configuration parameters section
                        foreach (string key in commonConfigurationParameters.AllKeys) 
                        {
                            if (string.Compare(ConnectionStringToken, key, StringComparison.OrdinalIgnoreCase) == 0)
                            {
                                connectionString = commonConfigurationParameters[ConnectionStringToken].Value; 
                                break;
                            } 
                        } 
                    }
                } 

                // If no connectionString parsed out of the params, inner layer throws
                //   System.ArgumentNullException: Connection string cannot be null or empty
                //   Parameter name: connectionString 
                // But this API caller does not have connectionString param.
                // So throw ArgumentException with the original message. 
                if (String.IsNullOrEmpty(connectionString)) 
                    throw new ArgumentNullException(ConnectionStringToken, ExecutionStringManager.MissingConnectionString);
            } 

            Init(connectionString);
        }
 
        #region Accessors
 
        internal string ConnectionString 
        {
            get { return this.connString; } 
        }

        #endregion Accessors
 

        #region Internal Methods 
        /// 
 
        /// Disallow the hosting service to have different connection string if using SharedConnectionWorkflowTransactionService
        /// Should be called after all hosting services are added to the WorkflowRuntime 
        /// 
        /// 
        internal void DetectSharedConnectionConflict(WorkflowCommitWorkBatchService transactionService)
        { 
            SharedConnectionWorkflowCommitWorkBatchService sharedConnectionTransactionService = transactionService as SharedConnectionWorkflowCommitWorkBatchService;
            if (sharedConnectionTransactionService != null) 
            { 
                if (String.Compare(sharedConnectionTransactionService.ConnectionString, this.connString, StringComparison.Ordinal) != 0)
                    throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, 
                        ExecutionStringManager.SharedConnectionStringSpecificationConflict, this.connString, sharedConnectionTransactionService.ConnectionString));
            }

        } 

        #region Get a connection 
 
        internal DbConnection OpenNewConnection()
        { 
            // Always disallow AutoEnlist since we enlist explicitly when necessary
            return OpenNewConnection(true);
        }
 
        internal DbConnection OpenNewConnectionNoEnlist()
        { 
            return OpenNewConnection(true); 
        }
 
        internal DbConnection OpenNewConnection(bool disallowEnlist)
        {
            DbConnection connection = null;
            string connectionStr = this.connString; 

            if (disallowEnlist) 
 				connectionStr += DbResourceAllocator.EnlistFalseToken; 

            if (this.localProvider == Provider.SqlClient) 
				connection = new SqlConnection(connectionStr);
            else
				connection = new OleDbConnection(connectionStr);
 
            connection.Open();
 
            return connection; 
        }
 
        /// 

        /// Gets a connection enlisted to the transaction.
        /// If the transaction already has a connection attached to it, we return that,
        /// otherwise we create a new connection and enlist to the transaction 
        /// 
        ///  
        /// output if we created a connection 
        /// 
        internal DbConnection GetEnlistedConnection(WorkflowCommitWorkBatchService txSvc, Transaction transaction, out bool isNewConnection) 
        {
            DbConnection connection;
            SharedConnectionInfo connectionInfo = GetConnectionInfo(txSvc, transaction);
 
            if (connectionInfo != null)
            { 
                connection = connectionInfo.DBConnection; 
                Debug.Assert((connection != null), "null connection");
                Debug.Assert((connection.State == System.Data.ConnectionState.Open), 
                    "Invalid connection state " + connection.State + " for connection " + connection);

                isNewConnection = false;
            } 
            else
            { 
                connection = this.OpenNewConnection(); 
                connection.EnlistTransaction(transaction);
 
                isNewConnection = true;
            }

            return connection; 
        }
 
        #endregion Get a connection 

        #region Get Local Transaction 

        internal static DbTransaction GetLocalTransaction(WorkflowCommitWorkBatchService txSvc, Transaction transaction)
        {
            DbTransaction localTransaction = null; 
            SharedConnectionInfo connectionInfo = GetConnectionInfo(txSvc, transaction);
 
            if (connectionInfo != null) 
                localTransaction = connectionInfo.DBTransaction;
 
            return localTransaction;
        }

        #endregion Get Local Transaction 

        #region Get a command object for querying 
 
        internal DbCommand NewCommand()
        { 
            DbConnection dbConnection = OpenNewConnection();
            return DbResourceAllocator.NewCommand(dbConnection);
        }
 
        internal static DbCommand NewCommand(DbConnection dbConnection)
        { 
            return NewCommand(null, dbConnection, null); 
        }
        internal static DbCommand NewCommand(string commandText, DbConnection dbConnection, DbTransaction transaction) 
        {
            DbCommand command = dbConnection.CreateCommand();
            command.CommandText = commandText;
            command.Transaction = transaction; 

            return command; 
        } 

        #endregion Get a command object for querying 

        #region build a command parameter object for a stored procedure

        internal DbParameter NewDbParameter() 
        {
            return NewDbParameter(null, null); 
        } 

        internal DbParameter NewDbParameter(string parameterName, DbType type) 
        {
            if (this.localProvider == Provider.SqlClient)
            {
                if (type == DbType.Int64) 
                    return new SqlParameter(parameterName, SqlDbType.BigInt);
                else 
                    return new SqlParameter(parameterName, type); 
            }
            else 
            {

                if (type == DbType.Int64)
                    return new OleDbParameter(parameterName, OleDbType.BigInt); 
                else
                    return new OleDbParameter(parameterName, type); 
            } 
        }
 
        internal DbParameter NewDbParameter(string parameterName, DbType type, ParameterDirection direction)
        {
            DbParameter parameter = NewDbParameter(parameterName, type);
            parameter.Direction = direction; 

            return parameter; 
        } 

        internal DbParameter NewDbParameter(string parameterName, object value) 
        {
            if (this.localProvider == Provider.SqlClient)
                return new SqlParameter(parameterName, value);
            else 
                return new OleDbParameter(parameterName, value);
        } 
 
#endregion build a command parameter object for a stored procedure
 
#endregion Public Methods


#region Private Helpers 

        private void Init(string connectionStr) 
        { 
			SetConnectionString(connectionStr);
 
            try
            {
                // Open a connection to see if it's a valid connection string
                using (DbConnection connection = this.OpenNewConnection(false)) 
                {
                } 
            } 
            catch (Exception e)
            { 
                throw new ArgumentException(ExecutionStringManager.InvalidDbConnection, "connectionString", e);
            }

            // OLEDB connection pooling causes this exception in ExecuteInsertWorkflowInstance 
            // "Cannot start more transactions on this session."
            // Disable pooling to avoid dirty connections. 
            if (this.localProvider == Provider.OleDB) 
                this.connString = String.Concat(this.connString, ";OLE DB Services=-4");
        } 

        private void SetConnectionString(string connectionString)
        {
            if (String.IsNullOrEmpty(connectionString) || String.IsNullOrEmpty(connectionString.Trim())) 
                throw new ArgumentNullException("connectionString", ExecutionStringManager.MissingConnectionString);
 
            DbConnectionStringBuilder dcsb = new DbConnectionStringBuilder(); 
            dcsb.ConnectionString = connectionString;
 
            // Don't allow the client to specify an auto-enlist value since we decide whether to participate in a transaction
            // (enlist for writing and not for reading).
            if (dcsb.ContainsKey("enlist"))
            { 
                throw new ArgumentException(ExecutionStringManager.InvalidEnlist);
            } 
 
            this.connString = connectionString;
            // 
            // We only support sqlclient, sql is the only data store our OOB services talk to.
            localProvider = Provider.SqlClient;
        }
        /* 
        private void SetLocalProvider(string connectionString)
        { 
            // Assume caller already validated the connection string 
            MatchCollection providers = Regex.Matches(connectionString, @"(^|;)\s*provider\s*=[^;$]*(;|$)", RegexOptions.IgnoreCase);
 
            // Cannot use DbConnectionStringBuilder because it selects the last provider, not the first one, by itself.
            // A legal Sql connection string allows for multiple provider specification and
            // selects the first provider
            if (providers.Count > 0) 
            {
                // Check if the first one matches "sqloledb" or "sqloledb." 
                if (Regex.IsMatch(providers[0].Value, @"provider\s*=\s*sqloledb(\.\d+)?\s*(;|$)", RegexOptions.IgnoreCase)) 
                {
                    this.localProvider = Provider.OleDB; 
                }
                else
                {
                    // We don't support other providers 
                    throw new ArgumentException(String.Format(CultureInfo.CurrentCulture,ExecutionStringManager.UnsupportedSqlProvider, providers[0].Value));
                } 
            } 
            else
            { 
                // SqlClient provider requires no provider keyword specified in connection string
                this.localProvider = Provider.SqlClient;
            }
        } 
        */
 
        private static SharedConnectionInfo GetConnectionInfo(WorkflowCommitWorkBatchService txSvc, Transaction transaction) 
        {
            SharedConnectionInfo connectionInfo = null; 

 			SharedConnectionWorkflowCommitWorkBatchService scTxSvc = txSvc as SharedConnectionWorkflowCommitWorkBatchService;
            if (scTxSvc != null)
			{ 
                connectionInfo = scTxSvc.GetConnectionInfo(transaction);
 
                // The transaction service can't find entry if the transaction has been completed. 
                // be sure to propate the error so durable services can cast to appropriate exception
                if (connectionInfo == null) 
                    throw new ArgumentException(
                        String.Format(CultureInfo.CurrentCulture,ExecutionStringManager.InvalidTransaction));
            }
            return connectionInfo; 
        }
 
#endregion Private Helpers 
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

                        

                        

                        
                        

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