Changes between Version 10 and Version 11 of FDORfc30


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Timestamp:
11/19/08 06:44:44 (16 years ago)
Author:
brentrobinson
Comment:

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  • FDORfc30

    v10 v11  
    2828There are a number of places in core FDO and Provider source code where data values are converted from one type to another. These data values include property values for features and property constraint values. Also, as various FDO client applications are written, some of them may also need to do data type conversion.
    2929
    30 One current example is the FdoIDescribeSchema implementation for the RDBMS providers, which extracts check constraints from SQL expressions obtained from the RDBMS, and converts them into FDO Property Value Constraints. These constraints contain data values that represent ranges or lists of allowed values. The data types determined by the expression parser do not always exactly match the data type for the property that owns the constraint. When the types differ, the data values are converted to the property's data type.
     30One current example is the [http://svn.osgeo.org/fdo/trunk/Fdo/Unmanaged/Inc/Fdo/Commands/Schema/IDescribeSchema.h FdoIDescribeSchema] implementation for the RDBMS providers, which extracts check constraints from SQL expressions obtained from the RDBMS, and converts them into FDO Property Value Constraints. These constraints contain data values that represent ranges or lists of allowed values. The data types determined by the expression parser do not always exactly match the data type for the property that owns the constraint. When the types differ, the data values are converted to the property's data type.
    3131
    3232Another example is when an SDF file has a feature class with an int64 identity property called ID, and an FdoISelect is performed with the following string filter: