Replace a complex connection string with a DSN? the PDF format in a TechRepublic Download. About connection. to the file can use a File DSN connection. FILE: MDACCON.EXE Using Connection Strings with ODBC. you can use what is called a DSN-less connection string and explicitly enumerate all of the. This topic is about: Creating a Connection String for an ODBC System, User or File DSN.
Connecting Using File Data Sources. The connection information for a file data source is stored in a . As a result, the connection string can be used repeatedly by a single user or shared among several users if they have the appropriate driver installed.
All connection strings in one place. Find the syntax for your database connection using ADO.NET, ADO, ODBC, OLEDB, C#, VB, VB.NET, ASP.NET and more. The term often overlaps with 'connection string'. Types of data source name. File DSNs - stored in the filesystem with one DSN per file. DSN and DSN-less Connection Strings DSN or DSN-less? Connection to your database can be done using either a DSN (Data Source Name) or without DSN aka DSN-less. Connection strings for DSN. Connect using ODBC DSN and ODBC.NET Provider.
The file contains a driver name (or another data source name in the case of an unshareable file data source) and optionally, a connection string that can be used by SQLDriver. Connect. The Driver Manager builds the connection string for the call to SQLDriver. Connect from the keywords in the . A file data source allows an application to specify connection options without having to build a connection string for use with SQLDriver. Connect. The file data source usually is created by specifying the SAVEFILE keyword, which causes the Driver Manager to save the output connection string created by a call to SQLDriver. Connect to the . dsn file.
That connection string can be used repeatedly by calling SQLDriver. Connect with the FILEDSN keyword. This streamlines the connection process and provides a persistent source of the connection string. File data sources also can be created by calling SQLCreate.
Data. Source in the installer DLL. Information can be written into the .
SQLWrite. File. DSN, and read from the . SQLRead. File. DSN; both of these functions are also in the installer DLL. For information about the installer DLL, see Configuring Data Sources. The keywords used for connection information are in the [ODBC] section of a . The minimum information that a shareable .
ODBC] section is the DRIVER keyword: The shareable . DRIVER = SQL Server. DATABASE = My. DB.
When the file data source is unshareable, the . DSN keyword. When the Driver Manager is sent the information in an unshareable file data source, it connects as necessary to the data source indicated by the DSN keyword. An unshareable . dsn file would contain the following keyword: The connection string used for a file data source is the union of the keywords specified in the . SQLDriver. Connect. If any of the keywords in the . Driver Manager decides which keyword value should be used.
For more information, see SQLDriver.