Table UDF Implementation Examples

Implementation examples start with a simple table UDF and increase in complexity.

The table UDF implementation examples are included in the samples directory. These examples start with a simple table UDF and build upon its complexity and functionality as the examples progress.

The examples are available in a precompiled dynamic library called libv4apiex. (The extension of this library name is platform dependent.) This library has linked in the functions defined in udf_main.cxx, which contains the library level functions, such as extfn_use_new_api. Put libv4apiex in a directory the server can read.

• Implementing Sample Table UDF udf_rg_1
  The sample table UDF called udf_rg_1 illustrates how a v4 Table UDF can generate n rows of data. The implementation of the table UDF is in the samples directory in udf_rg_1.cxx.
• udf_rg_2
  The sample table UDF udf_rg_2 builds on the sample in udf_rg_1.cxx and has the same behavior. The procedure is called udf_rg_2 and its implementation is in the samples directory in udf_rg_2.cxx.
• udf_rg_3
  The sample table UDF udf_rg_3 builds upon udf_rg_2 and has similar behavior. The procedure is called udf_rg_3 and its implementation is in the samples directory in udf_rg_3.cxx.
• apache_log_reader
  The sample table UDF apache_log_reader reads the contents of an Apache access log or an Apache error log into table data. It is implemented in the file apache_log_reader.cxx in the samples directory.
• udf_blob
  The sample table UDF udf_blob illustrates how a table UDF or TPF can read LOB input parameters using the blob API.