Constant 

Description 

ConnectionName  

Name of connection. If connection properties are read from the dbxconnections.ini file, this is the ini file section name. AdoDbx Client can use this property setting for a simple one property connection string. Connection names can also be used to load a connection from a TDBXConnectionFactory instance.  

InstalledDrivers  

dbxdrivers.ini section that specifies which drivers are enabled.  

GetDriverFunc  

Used by DBXDynalink drivers to specify exported entry point for loading a driver prior to dbExpress 4.  

VendorLib  

Used by DBXDynalink drivers. Name of a vendor specific client library.  

ErrorResourceFile  

Used only by Linux versions of dbExpress to specify a localized error message file.  

LibraryName  

Used by DBXDynalink drivers to specify the name of the DBXDynalink DLL.  

DriverName  

Unique name for a dbExpress driver. Used by the dbxconnections.ini file to refer to a connections driver in the dbxdrivers.ini file.  

Host  

Host name of a database server that a driver connects to.  

Port  

Port number of a database server that a driver connects to.  

Database  

Name of a database to connect to.  

UserName  

Login user name used to connect to a database.  

Password  

Login password name used to connect to a database.  

Role  

Login role used to connect to a database.  

IsolationLevel  

Initial transaction isolation to use when connecting to a database. Transaction isolation can also be specified when a transaction is started.  

MaxBlobSize  

Maximum BLOB size. Set to –1 to specify no limit.  

DelegateConnection  

Delegate connection used by this connection. Delegate connections implement the dbExpress 4 driver framework. They can perform pre or post processing of all public and protected methods before delegating to the real connection or another delegate connection.  

DriverUnit  

Used to provide informative error message when driver cannot be loaded.  

DriverPackage  

Used to load a native driver dynamically.
Deprecated. Preferable to just add the a comma plus the package name to the end of the DriverPackageLoader property setting.  

DelegateDriver  

Indicates that this driver is a delegate and can only be used in conjunction with a non-delegate driver.  

DriverAssembly  

Used to load a managed driver dynamically.
Deprecated. Preferable to just add the a comma plus the package name to the end of the DriverPackageLoader property setting.  

DriverPackageLoader  

Native Driver loader class used to load a native driver dynamically from a package. Comma separated class and package name.  

DriverAssemblyLoader  

Managed Driver loader class used to load a managed driver dynamically from an assembly. Comma separated class and package name.  

DelegateDriver  

Indicates that this driver is a delegate and can only be used in conjunction with a non-delegate driver.  

SchemaOverride  

Most applications should not need to use this constant. It is provided for backwards compatibility of the dbExpress VCL. VCL components use this setting to scope metadata requests. This property should be set to user-name.override-schema-name. For example, tables created by the MSSQL sa user are placed in the dbo schema. In this case, SchemaOverride can be set to 'sa.dbo'. This causes VCL to specify the 'dbo' schema for metadata requests when a connection is made using the 'sa' user. An SQL '%' like pattern can also be used for the user-name and the override-schema-name. For example, '%.%' causes the schema to not be specified at all for all users.  

MetaDataPackageLoader  

Native MetaData loader class used to load a native driver dynamically from a package.  

MetaDataAssemblyLoader  

Managed MetaData loader class used to load a managed driver dynamically from an assembly.  

ProductVersion  

Can be specified as a driver property as an override of the TDBXConnection.ProductVersion property. This may be necessary for drivers that do not have the ability to report the product version. The ProductVersion is a number in the format nn.nn.nnnn.  

ProductName  

Provides the product name for the dbExpress metadata.  

ServerConnection  

When connecting to a DataSnap server, this is the name of a server method that returns an instance of a TDBXConnection. All SQL statements and SQL stored procedure commands are executed against this TDBXConnection instance. This allows client and server methods to share the same database connection There is a built-in DSAdmin.GetConnection method that takes a single input parameter, which is the name of a connection in the server-side dbxconnections.ini file and returns a TDBXConnection instance. For instance, to set the ServerConnection using this server method for a connection called "myoracleconnection", set ServerConnection: ServerConnection=DSAdmin.GetConnection("myoracleconnection"). Alternatively you can implement your own server method that returns a TDBXConnection instance.  

SupportsParameterMetadata  

This can be passed to the TDBXConnection.GetVendorProperty method to determine if the driver supports parameter metadata. If parameter metadata is supported, executing TDBXCommand.Prepare method causes the TDBXCommand parameter list to be automatically populated with parameters for the command. Note that if parameters were already added to the command, parameters are not automatically added.  

ConnectTimeout  

Maximum time in seconds to wait for a new connection to be opened. If the specified time expires, an exception is thrown. Not all drivers support this operation.