| Database Independent Abstraction Layer for C: libdbi Programmer's Guide | ||
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If your application has successfully opened a connection to a database, all operations on this connection may cause errors. There are two classes of errors:
libdbi retrieves and stores the error codes of the database engine client library if it provides error codes in a suitable format. If the client library does not support error numbers as positive integers, the value DBI_ERROR_CLIENT indicates an error status instead. In addition a string may be provided which describes or further elaborates the error status. The possible values of error number and error message depend on the database engine used for the connection.
A number of errors may occur within the libdbi framework or within a database driver, e.g. if your program queries nonexistent columns or attempts to read past the last row of a result set. The possible error numbers and error messages are predefined by libdbi.
Use the function dbi_conn_error to access the error number and error message of the most recent connection operation.