OleDbConnectionFactory.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Data / System / Data / OleDb / OleDbConnectionFactory.cs / 1 / OleDbConnectionFactory.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.OleDb
{ 
    using System;
    using System.Data.Common;
    using System.Data.ProviderBase;
    using System.Diagnostics; 
    using System.Collections.Specialized;
    using System.Configuration; 
    using System.IO; 

    sealed internal class OleDbConnectionFactory : DbConnectionFactory { 
        private OleDbConnectionFactory() : base() {}
        // At this time, the OleDb Managed Provider doesn't have any connection pool
        // counters because we'd only confuse people with "non-pooled" connections
        // that are actually being pooled by the native pooler. 

        private const string _metaDataXml           = ":MetaDataXml"; 
        private const string _defaultMetaDataXml    = "defaultMetaDataXml"; 

        public static readonly OleDbConnectionFactory SingletonInstance = new OleDbConnectionFactory(); 

        override public DbProviderFactory ProviderFactory {
            get {
                return OleDbFactory.Instance; 
            }
        } 
 
        override protected DbConnectionInternal CreateConnection(DbConnectionOptions options, object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) {
            DbConnectionInternal result = new OleDbConnectionInternal((OleDbConnectionString)options, (OleDbConnection)owningObject); 
            return result;
        }

        protected override DbConnectionOptions CreateConnectionOptions(string connectionString, DbConnectionOptions previous) { 
            Debug.Assert(!ADP.IsEmpty(connectionString), "null connectionString");
            OleDbConnectionString result = new OleDbConnectionString(connectionString, (null != previous)); 
            return result; 
        }
 
        override protected DbMetaDataFactory CreateMetaDataFactory(DbConnectionInternal internalConnection, out bool cacheMetaDataFactory){

            Debug.Assert (internalConnection != null,"internalConnection may not be null.");
            cacheMetaDataFactory = false; 

 
            OleDbConnectionInternal oleDbInternalConnection = (OleDbConnectionInternal) internalConnection; 
            OleDbConnection oleDbOuterConnection = oleDbInternalConnection.Connection;
            Debug.Assert(oleDbOuterConnection != null,"outer connection may not be null."); 

            NameValueCollection settings = (NameValueCollection)PrivilegedConfigurationManager.GetSection("system.data.oledb");
            Stream XMLStream =null;
            String providerFileName =  oleDbOuterConnection.GetDataSourcePropertyValue(OleDbPropertySetGuid.DataSourceInfo,ODB.DBPROP_PROVIDERFILENAME) as string; 

            if (settings != null){ 
 
                string [] values = null;
                string metaDataXML = null; 
                // first try to get the provider specific xml

                // if providerfilename is not supported we can't build the settings key needed to
                // get the provider specific XML path 
                if (providerFileName != null){
                    metaDataXML =  providerFileName + _metaDataXml; 
                    values = settings.GetValues(metaDataXML); 
                }
 
                // if we did not find provider specific xml see if there is new default xml
                if (values == null) {
                    metaDataXML =_defaultMetaDataXml;
                    values = settings.GetValues(metaDataXML); 
                }
 
                // If there is new XML get it 
                if (values != null) {
                    XMLStream = ADP.GetXmlStreamFromValues(values,metaDataXML); 
                }
            }

            // if the xml was not obtained from machine.config use the embedded XML resource 
            if (XMLStream == null) {
                XMLStream = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("System.Data.OleDb.OleDbMetaData.xml"); 
                cacheMetaDataFactory = true; 
            }
 
            Debug.Assert (XMLStream != null,"XMLstream may not be null.");

            // using the ServerVersion as the NormalizedServerVersion. Doing this for two reasons
            //  1) The Spec for DBPROP_DBMSVER normalizes the ServerVersion 
            //  2) for OLE DB its the only game in town
            return new OleDbMetaDataFactory (XMLStream, 
                                             oleDbInternalConnection.ServerVersion, 
                                             oleDbInternalConnection.ServerVersion,
                                             oleDbInternalConnection.GetSchemaRowsetInformation()); 
        }

        override protected DbConnectionPoolGroupOptions CreateConnectionPoolGroupOptions(DbConnectionOptions connectionOptions) {
            return null; 
        }
 
        override internal DbConnectionPoolGroupProviderInfo CreateConnectionPoolGroupProviderInfo (DbConnectionOptions connectionOptions) { 
            return new OleDbConnectionPoolGroupProviderInfo();
        } 

        override internal DbConnectionPoolGroup GetConnectionPoolGroup(DbConnection connection) {
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) { 
                return c.PoolGroup;
            } 
            return null; 
        }
 
        override internal DbConnectionInternal GetInnerConnection(DbConnection connection) {
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) {
                return c.InnerConnection; 
            }
            return null; 
        } 

        override protected int GetObjectId(DbConnection connection) { 
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) {
                return c.ObjectID;
            } 
            return 0;
        } 
 
        override internal void PermissionDemand(DbConnection outerConnection) {
            OleDbConnection c = (outerConnection as OleDbConnection); 
            if (null != c) {
                c.PermissionDemand();
            }
        } 

        override internal void SetConnectionPoolGroup(DbConnection outerConnection, DbConnectionPoolGroup poolGroup) { 
            OleDbConnection c = (outerConnection as OleDbConnection); 
            if (null != c) {
                c.PoolGroup = poolGroup; 
            }
        }

        override internal void SetInnerConnectionEvent(DbConnection owningObject, DbConnectionInternal to) { 
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) { 
                c.SetInnerConnectionEvent(to); 
            }
        } 

        override internal bool SetInnerConnectionFrom(DbConnection owningObject, DbConnectionInternal to, DbConnectionInternal from) {
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) { 
                return c.SetInnerConnectionFrom(to, from);
            } 
            return false; 
        }
 
        override internal void SetInnerConnectionTo(DbConnection owningObject, DbConnectionInternal to) {
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) {
                c.SetInnerConnectionTo(to); 
            }
        } 
 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
namespace System.Data.OleDb
{ 
    using System;
    using System.Data.Common;
    using System.Data.ProviderBase;
    using System.Diagnostics; 
    using System.Collections.Specialized;
    using System.Configuration; 
    using System.IO; 

    sealed internal class OleDbConnectionFactory : DbConnectionFactory { 
        private OleDbConnectionFactory() : base() {}
        // At this time, the OleDb Managed Provider doesn't have any connection pool
        // counters because we'd only confuse people with "non-pooled" connections
        // that are actually being pooled by the native pooler. 

        private const string _metaDataXml           = ":MetaDataXml"; 
        private const string _defaultMetaDataXml    = "defaultMetaDataXml"; 

        public static readonly OleDbConnectionFactory SingletonInstance = new OleDbConnectionFactory(); 

        override public DbProviderFactory ProviderFactory {
            get {
                return OleDbFactory.Instance; 
            }
        } 
 
        override protected DbConnectionInternal CreateConnection(DbConnectionOptions options, object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) {
            DbConnectionInternal result = new OleDbConnectionInternal((OleDbConnectionString)options, (OleDbConnection)owningObject); 
            return result;
        }

        protected override DbConnectionOptions CreateConnectionOptions(string connectionString, DbConnectionOptions previous) { 
            Debug.Assert(!ADP.IsEmpty(connectionString), "null connectionString");
            OleDbConnectionString result = new OleDbConnectionString(connectionString, (null != previous)); 
            return result; 
        }
 
        override protected DbMetaDataFactory CreateMetaDataFactory(DbConnectionInternal internalConnection, out bool cacheMetaDataFactory){

            Debug.Assert (internalConnection != null,"internalConnection may not be null.");
            cacheMetaDataFactory = false; 

 
            OleDbConnectionInternal oleDbInternalConnection = (OleDbConnectionInternal) internalConnection; 
            OleDbConnection oleDbOuterConnection = oleDbInternalConnection.Connection;
            Debug.Assert(oleDbOuterConnection != null,"outer connection may not be null."); 

            NameValueCollection settings = (NameValueCollection)PrivilegedConfigurationManager.GetSection("system.data.oledb");
            Stream XMLStream =null;
            String providerFileName =  oleDbOuterConnection.GetDataSourcePropertyValue(OleDbPropertySetGuid.DataSourceInfo,ODB.DBPROP_PROVIDERFILENAME) as string; 

            if (settings != null){ 
 
                string [] values = null;
                string metaDataXML = null; 
                // first try to get the provider specific xml

                // if providerfilename is not supported we can't build the settings key needed to
                // get the provider specific XML path 
                if (providerFileName != null){
                    metaDataXML =  providerFileName + _metaDataXml; 
                    values = settings.GetValues(metaDataXML); 
                }
 
                // if we did not find provider specific xml see if there is new default xml
                if (values == null) {
                    metaDataXML =_defaultMetaDataXml;
                    values = settings.GetValues(metaDataXML); 
                }
 
                // If there is new XML get it 
                if (values != null) {
                    XMLStream = ADP.GetXmlStreamFromValues(values,metaDataXML); 
                }
            }

            // if the xml was not obtained from machine.config use the embedded XML resource 
            if (XMLStream == null) {
                XMLStream = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("System.Data.OleDb.OleDbMetaData.xml"); 
                cacheMetaDataFactory = true; 
            }
 
            Debug.Assert (XMLStream != null,"XMLstream may not be null.");

            // using the ServerVersion as the NormalizedServerVersion. Doing this for two reasons
            //  1) The Spec for DBPROP_DBMSVER normalizes the ServerVersion 
            //  2) for OLE DB its the only game in town
            return new OleDbMetaDataFactory (XMLStream, 
                                             oleDbInternalConnection.ServerVersion, 
                                             oleDbInternalConnection.ServerVersion,
                                             oleDbInternalConnection.GetSchemaRowsetInformation()); 
        }

        override protected DbConnectionPoolGroupOptions CreateConnectionPoolGroupOptions(DbConnectionOptions connectionOptions) {
            return null; 
        }
 
        override internal DbConnectionPoolGroupProviderInfo CreateConnectionPoolGroupProviderInfo (DbConnectionOptions connectionOptions) { 
            return new OleDbConnectionPoolGroupProviderInfo();
        } 

        override internal DbConnectionPoolGroup GetConnectionPoolGroup(DbConnection connection) {
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) { 
                return c.PoolGroup;
            } 
            return null; 
        }
 
        override internal DbConnectionInternal GetInnerConnection(DbConnection connection) {
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) {
                return c.InnerConnection; 
            }
            return null; 
        } 

        override protected int GetObjectId(DbConnection connection) { 
            OleDbConnection c = (connection as OleDbConnection);
            if (null != c) {
                return c.ObjectID;
            } 
            return 0;
        } 
 
        override internal void PermissionDemand(DbConnection outerConnection) {
            OleDbConnection c = (outerConnection as OleDbConnection); 
            if (null != c) {
                c.PermissionDemand();
            }
        } 

        override internal void SetConnectionPoolGroup(DbConnection outerConnection, DbConnectionPoolGroup poolGroup) { 
            OleDbConnection c = (outerConnection as OleDbConnection); 
            if (null != c) {
                c.PoolGroup = poolGroup; 
            }
        }

        override internal void SetInnerConnectionEvent(DbConnection owningObject, DbConnectionInternal to) { 
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) { 
                c.SetInnerConnectionEvent(to); 
            }
        } 

        override internal bool SetInnerConnectionFrom(DbConnection owningObject, DbConnectionInternal to, DbConnectionInternal from) {
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) { 
                return c.SetInnerConnectionFrom(to, from);
            } 
            return false; 
        }
 
        override internal void SetInnerConnectionTo(DbConnection owningObject, DbConnectionInternal to) {
            OleDbConnection c = (owningObject as OleDbConnection);
            if (null != c) {
                c.SetInnerConnectionTo(to); 
            }
        } 
 
    }
} 


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

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