UltraLite for MobileVB User's Guide
  Understanding UltraLite for MobileVB Development
    Connecting to the UltraLite database

Using a connection string to connect

To connect to an UltraLite database

1. Create a ULDatabaseManager object.

   You should create only one ULDatabaseManager object per application. This object is at the root of the object hierarchy. For this reason, it is often best to declare the ULDatabaseManager object global to the application.

   The following code creates a ULDatabaseManager object named dbMgr

   Public dbMgr As ULDatabaseManager
   ...
   Set dbMgr = New ULDatabaseManager

2. Create and open a connection to the database.

   The ULDatabaseManager CreateDatabase and OpenConnection methods are used to Create a database and Open a connection. Each takes a single string as its argument. The string is composed of a set of keyword-value pairs separated by semicolons. A schema file must be specified for CreateDatabase and a database file must be specified for OpenConnection.

   The following are mandatory connection parameters for CreateDatabase:

   Keyword	Description
   schema_file	The path and filename of the UltraLite schema. The default extension for UltraLite schema files is .usm. SCHEMA_FILE is a required parameter when using CreateDatabase on Windows desktop operating systems. CE_SCHEMA has precedence over SCHEMA_FILE. Required for CreateDatabase.
   ce_schema	The path and filename of the UltraLite schema on Windows CE. The default extension for UltraLite schema files is .usm. CE_SCHEMA is a required parameter when using CreateDatabase for CE.
   palm_schema	If using Palm, the name of the UltraLite schema for Palm. PALM_SCHEMA is a required parameter when using CreateDatabase on Palm devices. The Palm file extension is .pdb. Do not specify the extension in the palm_schema parameter.

   For more information on connection parameters, see Connection Parameters.

   Most applications use a single connection to an UltraLite database, and keep the connection open all the time. For this reason, it is often best to declare the ULConnection object global to the application.

   The following code opens a connection to an UltraLite database named mydata.udb (assuming the file exists).

   Public conn As ULConnection
   Dim conParms as String
   Dim filePath as String
   filepath="c:\tutorial"
   conParms = "uid=dba;pwd=sql;dbf=" + filepath +
      "\mydata.udb"
   Set conn = dbMgr.OpenConnection(conParms)