IBM Informix ODBC Driver with the DMR

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IBM Informix ODBC Driver with the DMR

IBM Informix ODBC Driver includes a Driver Manager Replacement (DMR) library. The DMR replaces the driver manager on platforms where no driver manager is available. Figure 3 shows an ODBC configuration with the DMR.

Figure 3. Architecture of the Driver Manager Replacement Module

This graphic contains four horizontal rectangles. The rectangles are labeled, from left to right, "ODBC 2.x/3.x Application", "IBM Informix ODBC Driver Manager Replacement Module", "IBM Informix ODBC Driver", and "Data Source." The rectangles are connected in a single horizontal line by three arrows.

Applications that are linked directly to the ODBC 3.5 driver and the DMR do not require the ODBC Driver Manager.

In addition to supporting ODBC 3.5 features, the DMR supports compatibility between ODBC 2.x applications and Version 2.90 of the IBM Informix ODBC Driver. To be compatible with ODBC 2.x applications, the application must link to Version 2.90 of IBM Informix ODBC Driver through the DMR or through the ODBC 3.5 driver manager.

You cannot use the IBM Informix DMR to connect to non-Informix data sources. The DMR does not support connection pooling. The DMR does not map between Unicode and ANSI APIs.